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Keysight Series 668xA
GPIB DC Power Supplies
Service Manual
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CERTIFICATION
Keysight Technologies certifies that this product met its published specifications at time of shipment from the factory.
Keysight Technologies further certifies that its calibration measurements are traceable to the United States National
Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other
International Standards Organization members.
WARRANTY
This Keysight Technologies hardware product is warranted against defects in material and workmanship for a period of
three years from date of delivery. Keysight Technologies software and firmware products, which are designated by
Keysight Technologies for use with a hardware product and when properly installed on that hardware product, are
warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of
90 days from date of delivery. During the warranty period Keysight Technologies will, at its option, either repair or replace
products which prove to be defective. Keysight Technologies does not warrant that the operation of the software, firmware,
or hardware shall be uninterrupted or error free.
For warranty service, with the exception of warranty options, this product must be returned to a service facility designated
by Keysight Technologies. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products
returned to Keysight Technologies for warranty service. Except for products returned to Customer from another country,
Keysight Technologies shall pay for return of products to Customer.
Warranty services outside the country of initial purchase are included in Keysight Technologies product price, only if
Customer pays Keysight Technologies international prices (defined as destination local currency price, or U.S. or Geneva
Export price).
If Keysight Technologies is unable, within a reasonable time to repair or replace any product to condition as warranted, the
Customer shall be entitled to a refund of the purchase price upon return of the product to Keysight Technologies.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer,
Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental
specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY IS EXPRESSED
OR IMPLIED. KEYSIGHT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. KEYSIGHT
SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.
ASSISTANCE
The above statements apply only to the standard product warranty. Warranty options, extended support contracts, product
maintenance agreements and customer assistance agreements are also available. Contact your nearest Keysight
Technologies Sales and Service office for further information on Keysight Technologies' full line of Support Programs.
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SAFETY CONSIDERATIONS
GENERAL. This is a Safety Class 1 instrument (provided with terminal for connection to protective earth ground).
OPERATION. BEFORE APPLYING POWER verify that the product is set to match the available line voltage, the
correct line fuse is installed, and all safety precautions (see following warnings) are taken. In addition, note the instrument's
external markings described under "Safety Symbols".
WARNING.
 Servicing instructions are for use by service-trained personnel. To avoid dangerous electrical shock, do not perform
any servicing unless you are qualified to do so.
 BEFORE SWITCHING ON THE INSTRUMENT, the protective earth terminal of the instrument must be connected to
the protective conductor of the (mains) power cord. The mains plug shall be inserted only in an outlet socket that is
provided with a protective earth contact. This protective action must not be negated by the use of an extension cord
(power cable) that is without a protective conductor (grounding). Grounding one conductor of a two-conductor outlet is
not sufficient protection.
 If this instrument is to be energized via an auto-transformer (for voltage change), make sure the common terminal is
connected to the earth terminal of the power source.
 Any interruption of the protective (grounding) conductor (inside or outside the instrument), or disconnecting of the
protective earth terminal will cause a potential shock hazard that could result in personal injury.
 Whenever it is likely that the protective earth connection has been impaired, this instrument must be made inoperative
and be secured against any unintended operation.
 Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be used.
Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.
 Do not operate this instrument in the presence of flammable gases or fumes.
 Do not install substitute parts or perform any unauthorized modification to this instrument.
 Some procedures described in this manual are performed with power supplied to the instrument while its protective
covers are removed. If contacted, the energy available at many points may result in personal injury.
 Any adjustment, maintenance, and repair of this instrument while it is opened and under voltage should be avoided as
much as possible. When this is unavoidable, such adjustment, maintenance, and repair should be carried out only by a
skilled person who is aware of the hazard involved.
 Capacitors inside this instrument may hold a hazardous electrical charge even if the instrument has been disconnected
from its power source.
SAFETY SYMBOLS.
Instruction manual symbol. The instrument will be marked with this symbol when it is necessary for you to refer to the
instruction manual in order to protect against damage to the instrument.
This sign indicates hazardous voltages.
This sign indicates an earth terminal (sometimes used in the manual to indicate circuit common connected to a ground
chassis).
The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly
performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the
indicated conditions are fully understood and met.
The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly
performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed
beyond a CAUTION sign until the indicated conditions are fully understood and met.
.
3
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Safety Symbol Definitions
Symbol
Description
Symbol
Description
Direct current
Terminal for Line conductor on permanently
installed equipment
Alternating current
Caution, risk of electric shock
Both direct and alternating current
Caution, hot surface
Three-phase alternating current
Caution (refer to accompanying documents)
Earth (ground) terminal
In position of a bi-stable push control
Protective earth (ground) terminal
(Intended for connection to external
protective conductor.)
Out position of a bi-stable push control
Frame or chassis terminal
On (supply)
Terminal for Neutral conductor on
permanently installed equipment
Off (supply)
Terminal is at earth potential
(Used for measurement and control
circuits designed to be operated with
one terminal at earth potential.)
Standby (supply)
Units with this symbol are not completely
disconnected from ac mains when this switch is
off. To completely disconnect the unit from ac
mains, either disconnect the power cord or have
a qualified electrician install an external switch.
Printing History
The edition and current revision of this manual are indicated below. Reprints of this manual containing minor corrections
and updates may have the same printing date. Revised editions are identified by a new printing date. A revised edition
incorporates all new or corrected material since the previous printing date. Changes to the manual occurring between
revisions are covered by change sheets shipped with the manual. Note that not all changes made to the power supply affect
the content of the manual. Refer to Appendix A for a history of manual updates.
Edition 1
Edition 2
Updated
Edition 3
April 1994
September, 2000
March, 2002
December, 2014
© Copyright 1993, 2000, 2014 Keysight Technologies
This document contains proprietary information protected by copyright. All rights are reserved. No part of this document
may be photocopied, reproduced, or translated into another language without the prior consent of Keysight Technologies.
The information contained in this document is subject to change without notice.
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Table of Contents
Introduction ............................................................................................................................................................................ 7
Scope................................................................................................................................................................................... 7
Organization..................................................................................................................................................................... 7
Instrument Identification..................................................................................................................................................... 7
Related Documents .......................................................................................................................................................... 8
Change Sheet................................................................................................................................................................. 8
Operating Manual.......................................................................................................................................................... 8
Manual Revisions............................................................................................................................................................. 8
Firmware Revisions ......................................................................................................................................................... 8
Safety Considerations ......................................................................................................................................................... 9
Conventions ........................................................................................................................................................................ 9
Electrostatic Discharge ....................................................................................................................................................... 9
Verification............................................................................................................................................................................ 11
Introduction....................................................................................................................................................................... 11
Tests .................................................................................................................................................................................. 11
Test Equipment Required.................................................................................................................................................. 11
List of Equipment........................................................................................................................................................... 11
Current-Monitoring Resistor .......................................................................................................................................... 11
Electronic Load .............................................................................................................................................................. 12
Programming The Tests .................................................................................................................................................... 13
General Considerations .................................................................................................................................................. 13
Programming Parameters ............................................................................................................................................ 13
General Measurement Techniques .................................................................................................................................... 13
Performance Test Record Sheets ...................................................................................................................................... 13
Operation Verification Tests ............................................................................................................................................. 14
Performance Tests............................................................................................................................................................. 14
Constant Voltage (CV) Tests ......................................................................................................................................... 14
Test Setup.................................................................................................................................................................... 14
Test Procedures ........................................................................................................................................................... 14
Constant Current (CC) Tests .......................................................................................................................................... 19
Test Setup.................................................................................................................................................................... 19
Test Procedures ........................................................................................................................................................... 19
Averaging the CC Measurements................................................................................................................................... 23
Troubleshooting .................................................................................................................................................................... 31
Introduction....................................................................................................................................................................... 31
Localizing the Problem .................................................................................................................................................. 31
Chapter Organization ..................................................................................................................................................... 31
Test Equipment Required.................................................................................................................................................. 32
Troubleshooting Procedures ............................................................................................................................................. 32
Power-On Selftest .......................................................................................................................................................... 32
Description .................................................................................................................................................................. 32
Disabling The Power-On Selftest................................................................................................................................ 32
Using the *TST? Query (GPIB Systems Supplies Only) ............................................................................................ 32
Troubleshooting Charts .................................................................................................................................................. 34
Troubleshooting Test Points........................................................................................................................................... 34
Bias and Reference Supplies .......................................................................................................................................... 34
CV/CC Status Annunciators Troubleshooting ............................................................................................................... 53
A3 FET Board Troubleshooting..................................................................................................................................... 53
Signature Analysis ............................................................................................................................................................ 56
Introduction.................................................................................................................................................................... 56
Firmware Revisions ....................................................................................................................................................... 56
Test Headers................................................................................................................................................................... 57
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Post-Repair Calibration..................................................................................................................................................... 62
When Required .............................................................................................................................................................. 62
Inhibit Calibration Jumper ............................................................................................................................................. 62
Calibration Password ..................................................................................................................................................... 62
Restoring Factory Calibration Constants ....................................................................................................................... 62
EEPROM Initialization ..................................................................................................................................................... 63
Transferring Calibration Constants To Factory Preset Locations ..................................................................................... 63
Disassembly Procedures ................................................................................................................................................... 68
Tools Required ............................................................................................................................................................... 68
Top Cover ...................................................................................................................................................................... 69
Removing Protective RFI Shield (Galvanized Sheet Metal).......................................................................................... 69
GPIB Board.................................................................................................................................................................... 69
A4 AC Input Assembly.................................................................................................................................................. 70
A5 DC RAIL Assembly ................................................................................................................................................. 70
A6 BIAS Assembly........................................................................................................................................................ 70
A3 FET Board................................................................................................................................................................ 70
A10 Control Assembly................................................................................................................................................... 71
Front Panel Assembly .................................................................................................................................................... 71
S1 Line Switch ............................................................................................................................................................... 71
A1 Front Panel Board..................................................................................................................................................... 71
A1DSP1 LCD Display ................................................................................................................................................... 72
A1G1 and A1G2 Rotary Controls .................................................................................................................................. 72
A1KPD Keypad ............................................................................................................................................................. 72
Output Bus Boards A7, A81 and A9 & Chassis Components........................................................................................ 72
Principles Of Operation ....................................................................................................................................................... 81
Introduction....................................................................................................................................................................... 81
A2 GPIB Board................................................................................................................................................................. 81
A1 Front Panel Assembly ................................................................................................................................................. 82
A10 Control Board............................................................................................................................................................ 82
Secondary Interface (P/O A10 Board) ........................................................................................................................... 82
A4 AC Input Board ........................................................................................................................................................... 85
A5 DC Rail Board............................................................................................................................................................. 85
A3 FET Board................................................................................................................................................................... 85
Output Circuits.................................................................................................................................................................. 86
Replaceable Parts.................................................................................................................................................................. 89
INTRODUCTION ............................................................................................................................................................ 89
Chapter Organization ..................................................................................................................................................... 89
Reading the Tables......................................................................................................................................................... 89
How To Order Parts .......................................................................................................................................................... 90
Diagrams.............................................................................................................................................................................. 115
Introduction..................................................................................................................................................................... 115
Chapter Organization ...................................................................................................................................................... 115
General Schematic Notes ................................................................................................................................................ 119
Backdating........................................................................................................................................................................... 149
Index .................................................................................................................................................................................... 155
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1
Introduction
Scope
Organization
This manual contains information for troubleshooting and repairing to the component level Keysight Series 668xA,
5-kilowatt power supplies. The remaining chapters of this manual are organized as follows:
Chapter
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Appendix A
Description
Verification procedures to determine the performance level of the supply either before or after repair.
Troubleshooting procedures for isolating a problem, procedures for replacing the defective component
and, if required, post-repair calibration and EEPROM initialization procedures.
Principles of power supply operation on a block-diagram level.
Replaceable parts, including parts ordering information.
Diagrams, including schematics, component location drawings, and troubleshooting test points.
Backdating information for power supplies with serial numbers below those listed in the title page of
this manual.
Instrument Identification
Keysight Technologies instruments are identified by a 10-digit serial number. The format is described as follows: first two
letters indicate the country of manufacture. The next four digits are a code that identify either the date of manufacture or of
a significant design change. The last four digits are a sequential number assigned to each instrument.
Item
Description
MY
The first two letters indicates the country of manufacture, where US = USA; MY = Malaysia; SG =
Singapore.
4100
This is a code that identifies either the date of manufacture or the date of a significant design change.
0101
The last four digits are a unique number assigned to each power supply.
Older serial number formats used with these instruments had a two-part serial number, i.e. 2701A-00101. This manual also
applies to instruments with these older serial number formats. Refer to Appendix A for backdating information.
Introduction
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7
Related Documents
Change Sheet
There may or may not be a Manual Change sheet included with this manual (see Manual Revisions). If one is included, be
sure to examine it for changes to this manual.
Operating Manual
Each power supply is shipped with an operating manual (see Replaceable Parts, Chapter 5 for part numbers) that covers the
following topics:












Options, accessories, specifications, supplementary characteristics, output characteristic curve, typical output
impedance curves.
Connecting the power cord, load, and remote sensing.
Connecting power supplies in series or autoparallel.
Connecting the remote controller and setting the GPIB address.
Configuring the digital port for remote inhibit, relay link, or digital I/O operation.
Connecting the analog port for external voltage programming control.
Turn-on tests, including selftest errors and runtime errors.
Front panel operation.
SCPI programming, an introduction to syntax, language dictionary, and status register operation.
Compatibility-language programming for operation with Keysight Series 603xA power supplies.
Replacement of line fuse and conversion of line voltage.
Calibration procedure (front panel and remote).
Manual Revisions
This manual was written for power supplies that have the same serial prefixes (first part) as those listed on the title page and
whose serial numbers (second part) are equal to or higher than those listed in the title page.
Note
1) If the serial prefix of your supply is higher than that shown in the title page then the supply was made
after the publication of this manual and may have hardware and/or firmware differences not covered in
the manual.
2) If they are significant to the operation and/or servicing of the power supply, those differences are
documented in one or more Manual Changes sheets included with this manual. These changes will also
be incorporated in future editions of the manual.
3) If the serial prefix on the power supply is lower than that shown on the title page, then the supply was
made before the publication of this manual and can be different from that described here. Such
differences are covered in "Appendix A – Manual Backdating Changes".
Firmware Revisions
The power supply's firmware resides in the A10 control board microprocessor chip and in ROM chips on the A2 GPIB and
A1 Front Panel boards. You can obtain the firmware revision number by either reading the integrated circuit label, or query
the power supply using the GPIB *IDN query command (see Chapter 3 - Troubleshooting). Also, see Chapter 3, Firmware
Revisions for the actual Keysight BASIC program that does this.
8
Introduction
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Safety Considerations
This power supply is a Safety Class I instrument, which means it has a protective earth terminal. This terminal must be
connected to earth ground through a power source equipped with a 4-wire, ground receptacle. Refer to the "Safety
Summary" page at the beginning of this manual for general safety information. Before operation or repair, check the power
supply and review this manual for safety warnings and instructions. Safety warnings for specific procedures are located at
appropriate places in the manual.
Hazardous voltage exist within the power supply chassis, at the output terminals, and at the analog
programming terminals.
Conventions

In diagrams, the name of a complementary signal is sometimes shown with a bar above the signal mnemonic. In other
diagrams and in the text, complementary signals are shown with an asterisk (*) after the mnemonic (such as PCLR*).
A mnemonic with a bar over it or an asterisk after it represents the same signal.

In this manual, all Keysight 668xA series supplies are referred to as system supplies.
Electrostatic Discharge
The power supply has components that can be damaged by ESD (electrostatic discharge). Failure to
observe standard, antistatic practices can result in serious degradation of performance, even when an
actual failure does not occur.
When working on the power supply observe all standard, antistatic work practices. These include, but are not limited to:





working at a static-free station such as a table covered with static-dissipative laminate or with a conductive table mat
(Keysight P/N 9300-0797, or equivalent).
using a conductive wrist strap, such as Keysight P/N 9300-0969 or 9300-0970.
grounding all metal equipment at the station to a single common ground.
connecting low-impedance test equipment to static-sensitive components only when those components have power
applied to them.
removing power from the power supply before removing or installing printed circuit boards.
Introduction
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9
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2
Verification
Introduction
This chapter provides test procedures for checking the operation of Keysight Series 668xA power supplies. The required
test equipment is specified and sample performance test record sheets are included. Instructions are given for performing
the tests either from the front panel or from a controller over the GPIB.
Tests
Two types of procedures are provided: Operation Verification tests and Performance tests.
Type of Test
Purpose
Operation Verification
These tests do not check all parameters, but comprise a short procedure to verify that the power
supply is performing properly.
Performance
These tests verify all the Specifications (not Supplementary Characteristics) listed in Table 1-1
of the Power Supply Operating Manual.
If you encounter failures or out-of-specification test results, see Troubleshooting Procedures (Chapter 3). The procedures
will determine if repair and/or calibration is required.
Note
The power supply must pass the selftest at power-on before the following tests can be performed. If the
power supply fails selftest, go to Chapter 3.
Test Equipment Required
List of Equipment
Table 2-1 lists the equipment required to perform the tests given in this chapter. Only the equipment marked with the
superscript "1'' is needed for the Operation Verification test.
Current-Monitoring Resistor
The four-terminal, current-monitoring resistor (current shunt) listed in Table 2-1 is required to eliminate output current
measurement error caused by voltage drops in leads and connections. The specified current shunts have special
current-monitoring terminals inside the load connection terminals. The accuracy of the current shunt must be 0.04% or
better. When using the 1000 amp 0.05% current shunt the measurement uncertainty should be stated for all calibrations.
Connect the current monitor directly to these current-monitoring terminals.
Verification 11
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Table 2-1. Test Equipment Required
Type
Digital Voltmeter1
Required Characteristics
Recommended Model
Resolution: 10 nV @ 1V
Readout: 8 1/2 digits
Accuracy: 20 ppm
Keysight 6682A, 6683A, Keysight
6684A:
0.001  0.04%, 300A, 100W
Keysight 3458A
Keysight 6680A, 6681A
100   0.05%, 1000A
DC Power Source with current capability
equal to UUT
Range: Voltage and current range must
exceed that of supply under test. Power:
5.4KW minimum
or
5 Kilowatt minimum
Keysight 6680A = 5.7 milliohms 4375W
Keysight 6681A = 13.8 milliohms 4640W
Keysight 6682A = 87.5 milliohms.
5040W
Keysight 6683A = 200 milliohms 5120W
Keysight 6684A = 312 milliohms 5120W
Sensitivity: 1mV
Bandwidth Limit: 20MHz
Probe: 1:1 with RF tip
Burster Type 1280
RMS Voltmeter
True RMS Bandwidth: 20MHz
Sensitivity: 100 V
Keysight 3400B
Current Transformer
Variable-Voltage
Transformer (AC Source)
0.1Volt per ampere: 1Hz to 20MHz
Power: 3 Phase 24KVA; Range:
180-235V 47 - 63Hz; 360- 440V
47 - 63Hz
Pearson Model 411
Superior Powerstat
1156DT-3Y, 0-280V, 50A,
24.2 KVA or equivalent .
GPIB Controller2
Full GPIB capabilities
HP Series 200/300
Current Monitor Resistor1
DC Power Supply
Electronic Load
Resistor Load
Oscilloscope
1
2
Guildline 9230/300
Keysight 6680A
3 each Keysight 6050A, w/3 each
Keysight 60504B per Keysight
6050A for all units
Keysight 54504A
Required for Operation Verification Tests.
Required for remote testing of 668xA models.
Electronic Load
Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable
resistor is used, switches must be used for connecting, disconnecting, and shorting the load resistor. For most tests, an
electronic load (see Table 2-1) is easier to use than a variable resistor. However, an electronic load may not be fast enough
for testing transient recovery time or may be too noisy for testing noise (PARD). In these cases, fixed load resistors of
suitable power dissipation can be used with minor changes to the test procedures given in this chapter.
12 Verification
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Programming The Tests
General Considerations
Procedures are given for programming these tests either from the front panel keypad or from a GPIB controller. The
procedures assume you know how to use the front panel keypad or how to program over the GPIB (see the Power Supply
Operating Manual for more information). When using computer-controlled tests, you may have to consider the relatively
slow (compared to computer and system voltmeters) settling times and slew rates of the power supply. Suitable WAIT
statements can be inserted into the test program to give the power supply time to respond to the test commands.
This power supply can provide more than 240VA at more than 2 volts. If the output connections touch each
other, severe arcing can occur resulting in burns, ignition or welding of parts. DO NOT ATTEMPT
TO MAKE CONNECTIONS WHILE OUTPUT POWER IS ON. These connections should be performed
only by qualified electronics personnel.
Programming Parameters
Table 2-2 lists the programming voltage and current values for each model. You can enter these values either from the front
panel or from a controller over the GPIB.
Table 2-2. Programming Voltage and Current Values
Keysight Model
Keysight 6680A
Keysight 6681A
Keysight 6682A
Keysight 6683A
Keysight 6684A
Full Scale
Voltage
5V
8V
21V
32V
40V
Max. Prog.
Voltage
5.125V
8.190V
21.50V
32.80V
41.00V
Full Scale
Current
875A
580A
240A
160A
128A
Max. Prog.
Current
895A
592A
246A
164A
131A
Max. Prog.
Overvoltage
6.25V
10.0V
26.3V
40.0V
50.0V
General Measurement Techniques
Figure 2-1 shows the setup for the Constant Voltage tests. Measure the dc output voltage directly at the sense (+S and -S)
terminals. Connect these terminals for remote sensing (to the +S and -S terminals). Connect these terminals for local
sensing. Be certain to use load leads of sufficient wire gauge to carry the output current (see Chapter 4 of the Power Supply
Operating Manual). To avoid noise pickup, use coaxial cable or shielded pairs for the test leads. If you use more than one
meter or a meter and an oscilloscope, connect separate leads for each instrument to avoid mutual-coupling effects.
Performance Test Record Sheets
When performing the tests in this chapter, refer to the Performance Test Record sheets supplied at the end of this chapter.
Table 2-6 is for recording common information, such as, the test equipment used and the environmental conditions. Tables
2-7 through 2-11 are dedicated to specific models. Each sheet lists the acceptable test ranges for the model and provides a
place to record the results of the test.
Note
It is recommended that before you perform the tests in either Table 2-4 or Table 2-5, that you first locate
the appropriate Performance Test Record sheet from Tables 2-7 through Table 2-11 for your specific
model. Make a copy of this sheet, and record the actual observed values in it while performing the tests.
Use the sheets in Tables 2-7 through Table 2-11 as master reference sheets to run copies at any time.
Verification 13
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Operation Verification Tests
Table 2-3 lists the requirements for operation verification, which is a subset of the performance tests.
Table 2-3. Operation Verification Tests
Test
Refer To
1
Turn-On Checkout
Power Supply Operating Manual
2
Voltage Programming and Readback Accuracy
Table 2-4
3
Current Programming and Readback Accuracy
Table 2-5
Note: Record the results of Tests 2 and 3 in the appropriate Performance Test Record sheets
Performance Tests
Performance tests check all the specifications of the power supply. The tests are grouped into constant-voltage mode tests
(Table 2-4) and constant-current mode tests (Table 2-5).
Constant Voltage (CV) Tests
Test Setup
Connect your dc voltmeter leads to only +S and -S (see Figure 2-1), because the power supply regulates the voltage
between these points, not between the + and - output terminals .
Test Procedures
Perform the test procedures in Table 2-4. The CV tests are:





Voltage Programming and Readback Accuracy
CV Load Effect
CV Source Effect
CV Noise (PARD)
Transient Recovery Time
Note
The tests are independent and may be performed in any order.
14 Verification
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Figure 2-1. Constant Voltage (CV) Test Setup
Verification 15
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Table 2-4. Constant Voltage (CV) Tests
Action
Normal Result
Voltage Programming and Readback Accuracy
This test verifies that the voltage programming, GPIB readback (GPIB system power supplies only), and front panel display
functions are within specifications. With system power supplies, values read back over the GPIB should be the same as
those displayed on the front panel.
1
Turn off the power supply and connect a DVM across +S and -S
(see Fig. 2-1).
2
Turn on the power supply with no load and program the output for 0 volts
and maximum programmable current (see Table 2-2).
CV annunciator on. Output current near
0.
3
Record voltage readings at DVM and on front panel display.
Readings within specified Low Voltage
limits.
4
Program voltage to full scale (see Table 2-2).
5
Record voltage readings of DVM and on front panel display.
Readings within specified High Voltage
limits.
CV Load Effect
This test measures the change in output voltage resulting from a change in output current from full-load to no-load.
1
Turn off the power supply and connect a DVM across +S and -S
(see Fig. 2-1).
2
Turn on the power supply and program the current to its maximum
programmable value and the voltage to its full-scale value (see Table 2-2).
3
Adjust the load to produce full-scale current (see Table 2-2) as shown on
the front panel display.
4
Record voltage reading of the DVM.
5
Adjust load to draw 0 amperes (open load). Record voltage reading of the
DVM.
6
Check test result.
CV annunciator is on. If it is not, adjust
the load to slightly reduce the output
current until the annunciator comes on.
The difference between the DVM
readings in steps 4 and 5 are within the
specified Load Effect limits.
CV Source Effect
This test measures the change in output voltage resulting from a change in ac line voltage from its minimum to maximum
value within the line voltage specifications.
1
Turn off the power supply and connect the ac power input through a
variable-voltage transformer.
16 Verification
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Table 2-4. Constant Voltage (CV) Tests (continued)
Action
Normal Result
CV Source Effect (cont)
2
Set the transformer to the nominal ac line voltage. Connect the DVM
across +S and -S (see Fig. 2-1).
3
Turn on the power supply and program the current to its maximum
programmable value and the voltage to its full-scale value (see Table 2-2).
4
Adjust the load to produce full-scale current (see Table 2-2) as shown on
the front panel display.
5
Adjust the transformer to decrease the ac input voltage to the low- line
condition (174Vac or 191Vac). Record the output voltage reading of the
DVM.
6
Adjust the transformer to increase the ac input voltage to the high-line
condition (220Vac or 250Vac). Record the output voltage reading on the
DVM.
7
Check test result.
CV annunciator is on. If it is not, adjust
the load to slightly reduce the output
current until the annunciator comes on.
The difference between the DVM
readings in steps 5 and 6 are within the
specified Source Effect limits.
CV Noise (PARD)
Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac voltage
superimposed on the dc output voltage. This test measures CV PARD, specified as the rms and peak-to-peak output
voltages over the frequency range of 20Hz to 20MHz.
1
Turn off the power supply and connect an a-c coupled oscilloscope across
the + and -output terminals (see Fig. 2-1). Set the oscilloscope bandwidth
limit to 20MHz (30MHz for the Keysight 54504A) and use an RF tip on
the oscilloscope probe.
2
Turn on the power supply and program the current to its maximum
programmable value and the voltage to its full-scale value (see Table 2-2).
3
Adjust the load to produce full-scale current (see Table 2-2) as shown on
the front panel display.
CV annunciator is on. If it is not, adjust
the load to slightly reduce the output
current until the annunciator comes on.
4
Record the amplitude of the waveform.
Amplitude is within the specified PARD
Peak-to-Peak limits.
5
Replace the oscilloscope connection with an ac rms voltmeter.
6
Record the reading obtained in Step 5.
Amplitude is within the specified PARD
rms limits.
Verification 17
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Table 2-4. Constant Voltage (CV) Tests (continued)
Action
Normal Result
Transient Recovery Time
This test measures the time required for the output voltage to return to within 100mV of its final value following a 50%
change in output load current. Measurements are made on both the unloading transient (from full load to 1/2 load) and the
loading transient (from 1/2 load to full load).
1
Turn off the power supply and connect an oscilloscope across +S and -S
(see Fig. 2-1).
2
Turn on the power supply and program the current to its maximum
programmable value and the voltage to its full-scale value (see Table 2-2).
3
Program the Electronic Load as follows:
þ
þ
þ
þ
þ
Operating mode to constant current.
Input load current to 1/2 the supply's full rated output current.
Transient current level to the supply's full rated output current.
Transient generator frequency = 100Hz.
Transient generator duty cycle = 50%.
4
Turn on the transient and adjust the oscilloscope to display response
waveform.
See Fig. 2-2.
5
Measure both the loading and unloading transients by triggering the
oscilloscope on both the negative and positive slopes of the transient.
Record the voltage level obtained at the 900-s interval .
Specified voltage level is reached within
900s.
Figure 2-2. Transient Response Waveform
18 Verification
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Constant Current (CC) Tests
Test Setup
Connect the appropriate current monitoring resistor (see Table 2-l) as shown in Fig. 2-3. The accuracy of the resistor must
be as specified in the table.
Test Procedures
The test procedures are given in Table 2-5. The tests are independent and may be performed in any order. The CC tests are:




Current Programming and Readback Accuracy.
CC Load Effect.
CC Source Effect.
CC Noise (PARD).
Table 2-5. Constant Current (CC) Tests
Action
Normal Result
Current Programming and Readback Accuracy
This test verifies that the current programming and readback are within specification.
1
Turn off the power supply and connect the current monitoring resistor as
shown in Fig. 2-3. Connect a DVM across the resistor .
2
Turn on the power supply and program the output for 5 volts and 0
amperes.
3
Short the load.
4
Observe the DVM voltage reading. Divide this by the resistance of the
current monitor resistor. Record the result as the Low Current value.
Value within specified Low Current
limits.
5
Record the front panel display readback.
Value within specified readback limits.
6
Program output current to full scale (see Table 2-2).
7
Repeat Steps 4 and 5.
Both current readings within specified
High Current and readback limits.
Verification 19
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Table 2-5. Constant Current (CC) Tests (continued)
Action
Normal Result
CC Load Effect
This test measures the change in output current resulting from a change in load from full-load voltage to a short circuit. It is
recommended that you use averaged readings for Steps 5 and 6 of this test (see Averaging AC Measurements at the end of
this chapter).
Note: Refer to Figure 2-4. If you are using Keysight 60504B Eloads, a series DC power source is required to supply the
minimum 3 volt input required by the Keysight 60504B Eloads. The series DC source must be capable of 3VDC at a
current level greater than the output current of the supply being tested. A switch can be used in place of the series supply if
the Eloads are used in place of a load resistor as shown in Fig. 2-4(b).
1
Turn off the power supply and connect a DVM across the current
monitoring resistor (see Fig. 2-3).
2
Turn on the power supply and program the current to its full scale value
and the voltage to its maximum programmable value (see Table 2-2).
3
Set the Electronic Load to CV mode and its voltage to full scale as
indicated on its front panel display. Set the series supply for 3VDC and a
current greater than that being tested. Series source should be in CV mode.
Power supply output current is full scale
and its CC annunciator is on. If not,
reduce the Electronic Load voltage
slightly until the annunciator comes on.
4
Observe the DVM reading. Divide this by the resistance of the current
monitoring resistor to obtain the output current. Record the result.
You may want to use an averaged
reading for this measurement.
5
Program the Electronic Load input to 3 volts or short the Electronic Load
input and repeat Step 5.
You may want to use averaged reading
for this measurement.
6
Check the result.
The difference between the current
readings taken in Step 5 and Step 6 must
be within specified “Load Effect” limits
(see Table 2-2).
20 Verification
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Table 2-5. Constant Current (CC) Tests (continued)
Action
Normal Result
CC Source Effect
This test measures the change in output current resulting from a change in ac line voltage from its minimum to its
maximum value within the line voltage specifications. It is recommended that you use averaged readings for Steps 6 and 8
of this test (see "Averaging AC Measurements" at the end of this chapter) .
1
Turn off the power supply and connect the ac power input through a
variable-voltage transformer.
2
Set the transformer to the nominal ac line voltage. Connect the DVM
across the current monitoring resistor (see Fig. 2-3).
3
Turn on the power supply and program the current to its full-scale value
and the voltage to its maximum programmable value (see Table 2-2).
4
Set the Electronic Load to CV mode and its voltage to full scale.
5
Adjust the transformer to decrease the ac input voltage to the low-line
condition (180Vac or 360Vac).
6
Observe the DVM reading. Divide this voltage by the resistance of the
current monitoring resistor to obtain the output current. Record the result.
7
Adjust the transformer to increase the ac input voltage to the high-line
condition (235Vac or 440Vac).
8
Observe the DVM reading. Divide this voltage by the resistance of the
current monitoring resistor to obtain the output current. Record the result.
You may want to use an averaged
reading for this measurement.
9
Check the test result.
The difference between the current
readings found in Step 6 and Step 8 is
within the specified current Source
Effect limits.
The power supply output current is full
scale and its CC annunciator is on. If
not, reduce the Electronic Load voltage
slightly until the annunciator comes on.
You may want to use an averaged
reading for this measurement.
Verification 21
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Figure 2-3. CC Load Effect Test Setup
22 Verification
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Averaging the CC Measurements
The CC Load Effect and CC Source Effect tests measure the dc regulation of the power supply's output current. When
doing these tests, you must be sure that the readings taken are truly dc regulation values and not instantaneous ac peaks of
the output current ripple. You can do this by making each measurement several times and then using the average of the
measurements as your test value. Voltmeters such as the Keysight 3458A System Voltmeter can be programmed to take
just such statistical average readings as required by these tests.
The following steps show how to set up the voltmeter from its front panel to take a statistical average of l00 readings.
represents the unlabeled shift key in the FUNCTION/RANGE group.
1.
2.
3.
5.
Program 10 power line cycles per sample by pressing
Program 100 samples per trigger by pressing
Set up voltmeter to take measurements in the statistical mode as follows:
a. Press
.
b. Press
until MATH function is selected, then press
.
until STAT function is selected, then press
.
c. Press
Now set up voltmeter to read the average of the measurements as follows:
a. Press
.
b. Press
until RMATH function is selected, then press
.
c. Press
until MEAN function is selected, then press
.
Execute the average reading program by pressing
6.
Wait for 100 readings and then read the average measurement by pressing
4.
.
.
.
.
Record this as your result.
Verification 23
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Table 2-6. Performance Test Record Form
Test Facility:
__________________________________________
__________________________________________
__________________________________________
__________________________________________
Model_____________________________________
Serial No.__________________________________
Options ____________________________________
Firmware Revision ___________________________
Report No.__________________________________________
Date______________________________________________
Customer___________________________________________
Tested By___________________________________________
Ambient Temperature (C)______________________________
Relative Humidity (%)_________________________________
Nominal Line Frequency (Hz)___________________________
Special Notes:
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
Test Equipment Used:
Description
Model No.
Trace No.
Cal. Due Date
1. AC Source
_______________
_______________
_________________
2. DC Voltmeter
_______________
_______________
_________________
3. RMS Voltmeter
_______________
_______________
_________________
4. Oscilloscope
_______________
_______________
_________________
5. Electronic Load
_______________
_______________
_________________
6. Current Monitoring
Shunt
_______________
_______________
_________________
24 Verification
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Table 2-7. Performance Test Record for Keysight Model 6680A
MODEL Keysight _____________
Report No.______________
Test Description
Minimum
Spec.
Results
*
Date_____________________
Maximum
Spec.
Constant Voltage Tests
Voltage Programming
and Readback
Low Voltage (0V) Vout
Front Panel Display Readback
-5mV
Vout - 7.5mV
________mV
________mV
+5mV
Vout + 7.5mV
High Voltage (5V) Vout
Front Panel Display Readback
4.993V
Vout - 10mV
_________V
_______mV
5.007V
Vout + 10mV
Load Effect
Vout - 0.29mV
_______mV
Vout + 0.29mV
Source Effect
Vout - 0.29mV
_______mV
Vout + 0.29mV
0
0
_______mV
_______mV
10mV
1.5mV
0
_______mV
150mV
PARD (Ripple and Noise)
Peak-to-Peak
RMS
Transient Response Time
(at 900 s)
Constant Current Tests
Current Programming
and Readback
Low Current (0A) Iout
Front Panel Display Readback
-450mA
Iout - 600mA
_______mA
_______mA
+450mA
Iout + 600mA
High Current (875A) Iout
Front Panel Display Readback
873.675A
Iout - 1.475mA
_________A
_______mA
+876.325A
Iout + 1.475mA
Load Effect
Iout – 108.75mA
________mA
Iout + 108.75mA
Source Effect
Iout – 108.75mA
________mA
Iout + 108.75mA
*Enter your test results in this column.
Verification 25
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Table 2-7. Performance Test Record for Keysight Model 6681A
MODEL Keysight_____________
Report No.______________
Test Description
Minimum
Spec.
Results
*
Date_____________________
Maximum
Spec.
Constant Voltage Tests
Voltage Programming
and Readback
Low Voltage (0V) Vout
Front Panel Display Readback
-8mV
Vout - 12mV
________mV
________mV
+8mV
Vout + 12mV
High Voltage (8V) Vout
Front Panel Display Readback
7.9888V
Vout - 16mV
_________V
_______mV
8.0112V
Vout + 16mV
Load Effect
Vout - 0.46mV
_______mV
Vout + 0.46mV
Source Effect
Vout - 0.46mV
_______mV
Vout + 0.46mV
0
0
_______mV
_______mV
10mV
1.5 mV
0
_______mV
150mV
PARD (Ripple and Noise)
Peak-to-Peak
RMS
Transient Response Time
(at 900 s)
Constant Current Tests
Current Programming
and Readback
Low Current (0A) Iout
Front Panel Display Readback
-300mA
Iout -400mA
_______mA
_______mA
+300mA
Iout +400mA
High Current (580A) Iout
Front Panel Display Readback
579.120A
Iout -980mA
_________A
________A
+580.880A
Iout + 980mA
Load Effect
Iout - 69mA
________mA
Iout +69mA
Source Effect
Iout - 69mA
________mA
Iout + 69mA
*Enter your test results in this column.
26 Verification
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Table 2-7. Performance Test Record for Keysight Model 6682A
MODEL Keysight_____________
Report No.______________
Test Description
Minimum
Spec.
Results
*
Date_____________________
Maximum
Spec.
Constant Voltage Tests
Voltage Programming
and Readback
Low Voltage (0V) Vout
Front Panel Display Readback
-21mV
Vout - 32mV
________mV
________mV
+21mV
Vout + 32mV
High Voltage (21V) Vout
Front Panel Display Readback
20.9706V
Vout -42.5mV
_________V
_______mV
21.0294V
Vout + 42.5mV
Load Effect
Vout – 1.07mV
_______mV
Vout + 1.07mV
Source Effect
Vout - 1.07mV
_______mV
Vout +1.07mV
0
0
_______mV
_______mV
10mV
1.5 mV
0
_______mV
150mV
PARD (Ripple and Noise)
Peak-to-Peak
RMS
Transient Response Time
(at 900 s)
Constant Current Tests
Current Programming
and Readback
Low Current (0A) Iout
Front Panel Display Readback
-125mA
Iout - 165mA
_______mA
_______mA
+125mA
Iout + 165mA
High Current (240A) Iout
Front Panel Display Readback
239.635A
Iout - 405mA
_________A
_______mA
+240.365A
Iout + 405mA
Load Effect
Iout - 29mA
________mA
Iout + 29mA
Source Effect
Iout - 29mA
________mA
Iout + 29mA
*Enter your test results in this column.
Verification 27
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Table 2-7. Performance Test Record for Keysight Model 6683A
MODEL Keysight_____________
Report No.______________
Test Description
Minimum
Spec.
Results
*
Date_____________________
Maximum
Spec.
Constant Voltage Tests
Voltage Programming
and Readback
Low Voltage (0V) Vout
Front Panel Display Readback
-32mV
Vout - 48mV
________mV
________mV
+32mV
Vout + 48mV
High Voltage (32V) Vout
Front Panel Display Readback
31.9552V
Vout - 64mV
_________V
_______mV
32.0448V
Vout + 64mV
Load Effect
Vout - 1.74mV
_______mV
Vout + 1.74mV
Source Effect
Vout - 1.74mV
_______mV
Vout + 1.74mV
0
0
_______mV
_______mV
10mV
1.0mV
0
_______mV
150mV
PARD (Ripple and Noise)
Peak-to-Peak
RMS
Transient Response Time
(at 900 s)
Constant Current Tests
Current Programming
and Readback
Low Current (0A) Iout
Front Panel Display Readback
-85mA
Iout - 110mA
_______mA
_______mA
+85mA
Iout + 110mA
High Current (160A) Iout
Front Panel Display Readback
159.755A
Iout - 270mA
_________A
_______mA
+160.245A
Iout + 270mA
Load Effect
Iout - 20mA
________mA
Iout + 20mA
Source Effect
Iout - 20mA
________mA
Iout + 20mA
*Enter your test results in this column.
28 Verification
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Table 2-7. Performance Test Record for Keysight Model 6684A
MODEL Keysight_____________
Report No.______________
Test Description
Minimum
Spec.
Results
*
Date_____________________
Maximum
Spec.
Constant Voltage Tests
Voltage Programming
and Readback
Low Voltage (0V) Vout
Front Panel Display Readback
-40mV
Vout - 60mV
________mV
________mV
+40mV
Vout + 60mV
High Voltage (40V) Vout
Front Panel Display Readback
39.944V
Vout - 80mV
_________V
_______mV
40.056V
Vout + 80mV
Load Effect
Vout - 2.3mV
_______mV
Vout + 2.3mV
Source Effect
Vout -2.3mV
_______mV
Vout + 2.3mV
0
0
_______mV
_______mV
10mV
1.0mV
0
_______mV
150mV
PARD (Ripple and Noise)
Peak-to-Peak
RMS
Transient Response Time
(at 900 s)
Constant Current Tests
Current Programming
and Readback
Low Current (0A) Iout
Front Panel Display Readback
-65mA
Iout - 90mA
_______mA
_______mA
+65mA
Iout + 90mA
High Current (128A) Iout
Front Panel Display Readback
127.807A
Iout - 218mA
_________A
_______mA
+128.193A
Iout + 218mA
Load Effect
Iout – 15.4mA
________mA
Iout + 15.4mA
Source Effect
Iout – 15.4mA
________mA
Iout + 15.4mA
*Enter your test results in this column.
Verification 29
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3
Troubleshooting
Shock Hazard: Most of the procedures in this chapter must be performed with power applied and
protective covers removed. These procedures should be done only by trained service personnel aware of
the hazard from electrical shock.
This instrument uses components that can be damaged or suffer serious performance degradation due to
ESD (electrostatic discharge). Observe standard antistatic precautions to avoid damage to the
components (see Chapter 1).
Introduction
Localizing the Problem
This chapter provides troubleshooting and repair information for the power supply. Before beginning troubleshooting
procedures, make certain the problem is in the power supply and not with an associated circuit, the GPIB controller (for
GPIB system power supplies), or ac input line. Without removing the covers, you can use the Verification tests in Chapter 2
to determine if the power supply is operating normally.
Chapter Organization
The information in this chapter is organized as follows:
Topic
Test Equipment Required
Troubleshooting Procedures
Information Given
Equipment required for completing all the tests in this chapter.
A series of flow charts for systematic location of defective boards, circuits, and
components. An explanation of the error codes and messages generated during the
power-on selftest. Signature analysis techniques for troubleshooting the digital circuits
on the front panel, primary GPIB, and secondary interface circuits. Specific
paragraphs for:

Checking the bias and reference supplies.

Troubleshooting the CV/CC status annunciators.

Troubleshooting the A3 FET board.
Post-Repair Adjustments
Calibration and EEPROM initialization procedures required after the replacement of
certain critical components.
Disassembly Procedures
Gaining access to and/or replacing components.
Troubleshooting 31
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Test Equipment Required
Table 3-1. Test Equipment Required
Equipment
Logic Probe
Test Clips
Ammeter/Current Shunt
Purpose
To check states of data lines.
To gain access to IC pins.
To measure output current.
Oscilloscope
Signature Analyzer
To check waveforms and signal levels.
To troubleshoot most of the primary
and secondary interface circuits.
To communicate with power supply via
the GPIB (for system units).
To measure output voltage and current,
bias and references.
GPIB Controller
DC Voltmeter
Recommended Model
Keysight 545A
AP Products No. LTC
Keysight 6680A & 6681A:
Burster 1280
Keysight 6682A, 6683A & 6684A:
Guildline 9230/300
Keysight 54504A
Keysight 5005A/B
Keysight BASIC series
Keysight 3458A
Troubleshooting Procedures
Power-On Selftest
Description
The procedures in the troubleshooting charts make use of the power-on selftest. The power-on selftest tests the front panel,
GPIB interface (for GPIB system power supplies), and secondary interface circuits. If the power supply fails the selftest, the
output remains disabled (turned off) and the front panel normally displays an error code or message (see Table 3-2). The
message is displayed indefinitely and the power supply will not accept GPIB or front panel commands.
Disabling The Power-On Selftest
In order to perform troubleshooting procedures that require programming of the power supply, you must disable the
power-on self test. Do this as follows:
1.
2.
3.
4.
Turn off the power supply.
Hold down the
key and turn on the supply.
Continue holding down the
for 2 seconds and wait until the PWR ON INIT indicator goes off.
The power supply is now on without executing power-on selftest.
Using the *TST? Query (GPIB Systems Supplies Only)
You can get the power supply to execute a partial selftest by sending it the GPIB *TST? query command. Table 3-2 shows
the tests that are performed in response to this command. These tests do not interfere with normal operation or cause the
output to change. The command returns a value of "0" if all tests pass. Otherwise, the command returns the error code of
the first test that failed. No error codes are displayed on the front panel and the power supply will attempt to continue
normal operation.
32 Troubleshooting
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Table 3-2. Selftest Error Codes/Messages
Code and/or
Message
El FP RAM
E2 FP ROM
E3 EE CHKSM
E4 PRI XRAM
Description
Front panel RAM test failed (power-on).
Front panel ROM test failed (power-on
and *TST?).
Front panel EEPROM checksum test failed
(power-on and *TST?).
Primary interface external RAM test failed
(power-on).
Primary interface internal RAM test failed
(power-on).
Primary interface ROM test failed
(power-on and *TST?).
GPIB interface test failed (power-on).
E5 PRI IRAM
E6 PRI ROM
E7 GPIB
E8 SEC RAM
Secondary interface RAM test failed
(power-on).
Secondary interface ROM test failed
(power-on and *TST?).
Secondary interface 5 volt readback test
failed (power-on and *TST?).
E9 SEC ROM
E10 SEC 5V
E11 TEMP
Ambient temperature readback test failed
(power-on and *TST?).
CV or CC DAC tests failed (power-on).
E12 DACS
Probable Cause Selftest Error
Codes/Messages
Microprocessor AlU3
ROM AlU4 or address latches AlU8
Possibly due to power loss during a write
operation. See Checksum Errors in Chapter 3 of
Operating Manual. If power loss is not the problem,
EEPROM A1U6 could be defective. (If you replace
AlU6, the power supply must be reinitialized and
calibrated.)
RAM A2U108
Microprocessor A2U114
ROM A2U106
Talker/listener A2U117
Microprocessor Al0U506
Microprocessor Al0U506
Comparators Al0U516, Al0U517 readback DAC
A10U512/U515, or secondary bias supply (5Vs
A4U304)
Thermistor Al0RT500 or comparator
Al0U517
CV DAC Al0U510/U513 or CC DAC
A10U511/U514 (see Figure 3-7).
NOTE: The following error messages can appear due to a failure occurring either while the power supply is operating or
during selftest.
SERIAL TIMOUT
Serial data line failure on A2 board.
See Figure 3-10 (system) or Figure 3-11 (bench).
SERIAL DOWN
Serial data line failure on A2 board.
See Figure 3-10 (system) or Figure 3-11 (bench).
UART PARITY
UART failed.
UART A2U112
UART FRAMING
UART failed.
UART A2U112
UART OVERRUN
UART failed.
UART A2U112
SBUF OVERRUN
Serial buffer failure UART.
SBUF FULL
Serial buffer failure.
EE WRITE ERR
EEPROM write failure.
UART A2U112 defective or GPIB board is in SA
mode
UART A2U112 defective or GPIB board is in SA
mode
EEPROM AlU6 defective or calibration error
SECONDARY DN
Serial data line failure on Main board.
See Figure 3-12.
Troubleshooting 33
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Troubleshooting Charts
Figure 3-1 gives overall troubleshooting procedures to isolate the fault to a circuit board or particular circuit (see Figure
3-20 for the location of the circuit boards). These procedures include the use of power-on selftest (Table 3-2) and signature
analysis techniques (Table 3-5 through Table 3-7). Some results of Figure 3-1 lead to more detailed troubleshooting charts
that guide you to specific components. The troubleshooting charts are organized as follows:
Chart
Figure 3-1
Figure 3-2
Trouble or Circuit
Overall procedure checks selftest errors, calibration errors, ac input circuit, fan, readback
circuits, A10 Control Board, GPIB cable, digital port, serial link, rotary controls, current
amplifier.
No display (from Figure 3-1).
Figure 3-3
Figure 3-4
OV circuit not firing (from Figure 3-1).
OV circuit is on at turn on (from Figure 3-1).
Figure 3-5
Output level is held low (from Figure 3-1).
Figure 3-6
Output level is held high (from Figure 3-1).
Figure 3-7
Figure 3-8
Figure 3-9
Figure 3-10
Figure 3-11
Figure 3-12
DAC circuits (from Figure 3-1).
DAC test waveforms.
CV and CC DAC and amplifiers (from Figure 3-1).
Serial Down circuit (from Figure 3-1).
Secondary interface circuit (from Figure 3-1).
Slow downprogramming circuit (from Figure 3-1).
Troubleshooting Test Points
The troubleshooting charts reference test points listed in Table 6-3 of Chapter 6. Test points are identified by an encircled
number (such as  in schematic diagrams and component location drawings, also in Chapter 6).
Bias and Reference Supplies
Many of the following troubleshooting procedures begin by checking the bias and/or reference voltages. Table 6-3 lists the
test points for these voltages and gives the correct reading for each. The circuit board component location diagrams identify
these points on each board.
34 Troubleshooting
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Figure 3-1. Overall Troubleshooting (Sheet 1 of 4)
Troubleshooting 35
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Figure 3-1. Overall Troubleshooting (Sheet 2 of 4)
36 Troubleshooting
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Figure 3-1. Overall Troubleshooting (Sheet 3 of 4)
Troubleshooting 37
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Figure 3-1. Overall Troubleshooting (Sheet 4 of 4)
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Figure 3-2. No Display Troubleshooting
Troubleshooting 39
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Figure 3-3. OV Will Not Fire Troubleshooting
40 Troubleshooting
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Figure 3-4. OV At Turn-On Troubleshooting
Troubleshooting 41
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Figure 3-5. Output Held Low Troubleshooting (Sheet 1 of 2)
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Figure 3-5. Output Held Low Troubleshooting (Sheet 2 of 2)
Troubleshooting 43
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Figure 3-6. Output Held High Troubleshooting
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Figure 3-7. DAC Circuits Troubleshooting
Troubleshooting 45
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Figure 3-8. DAC Test Waveforms
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Figure 3-9. CV/CC DAC and Amplifier Circuit Troubleshooting
Troubleshooting 47
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Figure 3-10. Serial Down Troubleshooting (Sheet 1 of 2)
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Figure 3-10. Serial Down Troubleshooting (Sheet 2 of 2)
Troubleshooting 49
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Figure 3-11. Secondary Interface Down (Sheet 1 of 2)
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Figure 3-11. Secondary Interface Down (Sheet 2 of 2)
Troubleshooting 51
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Figure 3-12. Slow Downprogramming Troubleshooting
52 Troubleshooting
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CV/CC Status Annunciators Troubleshooting
When troubleshooting the CV/CC status annunciators or status readback circuits, first measure the voltage drop across the
gating diodes, which are Al0D651 for the CC circuit and Al0D652 for the CV circuit (see A10, Sheet 2). A conducting
diode indicates an active (ON) control circuit. This forward drop is applied to the input of the associated status comparator
(A10U502) and drives the output low. The low signal indicates an active status which is sent to the secondary
microprocessor A10U506 via Programmed GAL Al0U505 (see schematic Sheet 1). The front panel CV annunciator lights
when the CV mode is active (CV is low) and the CC annunciator lights when the CC mode is active (CC is low). If neither
is active, the UNREGULATED (Unr) annunciator comes on.
A3 FET Board Troubleshooting
Because test points on the FET board are not accessible when the board is installed, troubleshooting must be performed
with the board removed from the power supply. Both static (power removed) and dynamic (power applied) troubleshooting
procedures are provided. The location of different test points are shown by encircled numbers on the A3 FET Board
schematic and component location diagrams (see Chapter 6). There are two isolated FET bridge assemblies (see schematic
in Fig. 6-10 sheets 1 and 2). Test each FET bridge individually.
Note
If any power FET (Q201-204, Q301-304, Q211, Q311, Q222, Q322, Q233, Q333, Q244, Q344) is
defective, you must replace all eight with a matched set.
Table 3-4. FET Troubleshooting Chart
Procedure
1.
Result
Static Troubleshooting
Turn the power supply off and remove the A3 FET board with its heatsink assembly
attached (see "Disassembly Procedures").
Measure the resistance between the + Rail (E202 & E302) and the - Rail ( E201 &
E301).
 20M.
3. Measure the resistance between the gate of each FET
(Q201-204, Q211, Q222, Q233, Q244, and Q301-304, Q311, Q322, Q333, and Q344) and
common (-Rail).
>15K.
4.
Measure the resistance across capacitor C201 & C301.
 150.
5.
Measure the resistance across the 15V bias input (E206 to E207 and E306 to E307).
 1K in the forward
direction and 490 in the
reverse direction.
2.
Continue with Dynamic Troubleshooting on the next page
Troubleshooting 53
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Table 3-4. FET Troubleshooting Chart (continued)
Procedure
Dynamic Troubleshooting
Result
1.
Turn off the power supply and remove the A3 FET Board with its heat sink
assembly.
2.
Short the collectors of Q251 and Q253 or Q351 and Q353 by connecting the
collector (case) of each transistor to common ( E507) .
3.
Connect waveform generator to J200-1 and J200-2.
4.
Set generator to produce a 20 kHz, 20V p-p triangular waveform
5.
Connect 15V from an external supply to E206 or E306 (positive) and E207 or
E307 (common).
See "Disassembly Procedures"
See Figure 3-14A.
Note: All of the following measurements are taken with respect to E207/E307 common,
test point
on A3 FET Board schematic diagram
+5V
6.
Check bias voltage at U203-1/U303-1
7.
While adjusting the external 15V supply input, check the bias trip point at
U204-1/U304-1
.
8.
Set external supply input to + 15V and check drive 1 waveform at
U201-10/U301-l0
and drive 2 waveform at U201-12/U301-12
9.
.
Check that pulses are present at U201-1
U302-1, U202-1
, U202-7/U302-7
, U201-7/U301-7
.
Voltage goes from low (0V) to high
(5V) at an input of approximately
12V; and from high to low at an
input of approximately 13V.
See Figure 3-14B.
.
and
See Figure 3-14C.
10. Pulses should be present on both sides of inductors L201-204 or L301-304 and
L213-216 or L313-316 as follows:
Check the pulses on the driver transistor side (Q251-Q254/Q351-Q354) of each
inductor.
See Figure 3-14D.
Check the pulses on the FET regulator side (Q201-Q204, Q301-Q304, Q211, Q311,
Q222, Q322, Q233, Q333 and Q244, Q344) of each inductor.
See Figure 3-14E.
If the waveforms do not have the fast step as shown in Figure 3-14, then the
associated FET gate input has an open circuit.
11. Measure the VREF voltage at U205-2
.
Check the peak current limit by connecting a 68K resistor from +5V (U201-9) to
U205-3 or U304-5.
 1.7V
All pulses turn off.
54 Troubleshooting
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Figure 3-13. A3 FET Board Test Waveforms
Troubleshooting 55
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Signature Analysis
Introduction
The easiest and most efficient method of troubleshooting microprocessor-based instruments is with signature analysis (SA).
This technique is similar to signal tracing with an oscilloscope in linear circuits. Part of the microprocessor memory is
dedicated to SA, and a known bit stream is generated to stimulate as many nodes as possible within a circuit. Because it is
virtually impossible to analyze a bit stream with an oscilloscope, a signature analyzer is used to compress the bit stream
into a four-character signature. By comparing the signatures of the IC under test to the correct signature for each node, you
can isolate faults to one or two components .
The following general rules apply to signature analysis testing:
1.
2.
3.
4.
5.
6.
Be sure to use the correct test setup connections for the specific test.
When examining an IC, note the correct signatures for Vcc (+5V) and for common. If an incorrect signature matches
either one, it probably indicates a short to that part of the circuit.
If two IC pins have identical signatures, they are probably shorted.
If two IC signatures are similar, it is only a coincidence.
If an input pin of an IC has an incorrect signal but the signal source (output of the previous IC) is correct, then look for
an open printed circuit track or soldering problems.
If the output signature of an IC is incorrect, it could be caused by that IC. However, it could also be caused by a short
at another component that is connected to that output.
Firmware Revisions
Each signature analysis table in this chapter shows the power supply firmware revision for which the table is valid. If
needed, for a Bench Supply you can confirm the firmware revision of your power supply by checking the label on the Front
panel ROM, AlU3, and on the Secondary microprocessor, A5U504. You can obtain the revisions on a Systems Supply with
the GPIB *IDN? query command. The following sample Keysight BASIC program does this:
10 ALLOCATE L$[52]
20 OUTPUT 705;"*IDN?"
30 ENTER 705;L$
40 DISP L$
50 END
For a typical Model 6681A, the controller will return a string with four comma-separated fields, as follows:
"Keysight Technologies ,6681A,O,fA.01.05sA.01.04pA.0l.02"
The first three fields in the string are the manufacturer, model number and 0. The last field gives the firmware information
as follows:
f= front panel firmware revision (A.01.05).
s= secondary interface firmware revision (A.01.04).
p= primary interface firmware revision (A.01.02).
Note
The firmware revisions numbers shown here may not match the firmware revision of your instrument.
Firmware revision numbers are subject to change whenever the firmware is updated.
56 Troubleshooting
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Test Headers
The power supply has two test headers as shown in Figure 3-15, each with a jumper that can be moved to different
positions for SA testing and for other functions. To gain access to the headers, remove the power supply top cover.
Pins
Description
Primary Interface Test Connector A2J106 (Systems Supplies Only)
7 and 8 (FLT/INH)
Normal operating (and storage) position. DIG CNTL port** is configured for
fault indicator (FLT) output and remote inhibit (RI) input .
1 and 2 (SA Mode)
Install jumper here for SA mode.
3 and 4 (DIG I/O)
Install jumper here to configure DIG CNTL port** for digital I/O operation .
5 and 6 (RELAY LINK)
Install jumper here to configure DIG CNTL port** for control of external relay
accessories.
** See Appendix D in power supply Operating Manual for information about the
digital control port.
Front Panel Test Connector A1J3
7 and 8 (NORM)
Normal operating (and storage) position of jumper.
1 and 2 (SA Mode)
Install jumper here for SA mode.
3 and 4 (INHIBIT CAL)
Install jumper here to disable calibration commands and prohibit calibration.
5 and 6 (FACTORY PRESET CAL)
Install jumper here to restore original factory calibration constants.
Figure 3-14. Test Header Jumper Positions
Troubleshooting 57
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Table 3-5. Primary Interface SA Test
Description: These signatures check some primary interface circuits on the Systems Supply A2 GPIB Board.
Valid A2U106 ROM Firmware Revision: A.01.06
Test Setup: See Figure 3-17.
1.
Turn off the power supply and remove the top cover.
2.
Connect SA jumper of connector J106 on A2 GPIB Board (see Figure 3-15).
3.
Connect signature analyzer CLOCK, START, STOP, and GROUND inputs as show in Figure 3-16 .
4.
Turn on the power supply and use the signature analyzer probe to take the following signatures:
Power:
5V = 9FFP
Serial Link: A2U109-3 = 0104
Microprocessor: A2U114-24 = 9FFP
A2U114-25 = UF39
Digital Control Interface: A2U118-1 = 9AF1
A2U118-9 = 40A5
A2U118-10 = 1029
A2U118-15 = 0010
A2U118-16 = 040A
Gated Array Logic: A2U119-2 = 0A55
A2U119-5 = 0040
A2U119-15 = 0040
5.
After completing the tests, be sure to return the J106 jumper to its original position.
Figure 3-15. Signature Analysis Signal Inputs
58 Troubleshooting
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Figure 3-16. Signature Analysis Connections, (Sheet 1 of 2)
Troubleshooting 59
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Figure 3-16. Signature Analysis Connections, (Sheet 2 of 2)
Table 3-6. Front Panel SA Test
Description: These signatures check front panel microprocessor AlU3.
Valid A1U4 ROM Firmware Revision: A.01.07
Test Setup: See Figure 3-17.
1 .Turn off the power supply and remove the top cover.
2. To gain access to A1 Front Panel Board, perform steps 1 and 2 of the disassembly procedure for A1 Front Panel
Assembly (see "Disassembly Procedures").
3. Connect SA jumper of connector J3 on A1 Front Panel Board (see Figure 3-15).
4. Connect signature analyzer CLOCK, START, STOP, and GROUND inputs and setup as shown in Figure 3-16.
5. Turn on the power supply and use the signature analyzer probe to take the following signatures:
Power:
5V = 3395
Microprocessor:
AlU3-15 = 3395
A1U3-29 = 1029
AlU3-19 = 552U
AlU3-30 = 0295
AlU3-20 = 954C
AlU3-31 = 0000
AlU3-21 = A552
AlU3-32= 3395
AlU3-22 = 2954
AlU3-33 = 0008
AlU3-23 = 0A55
AlU3-34 = 040A
AlU3-24 = 3395
AlU3-35 = 0102
AlU3-25 = 3395
AlU3-38 = 0002
AlU3-26 = 0000
AlU3-39 = 0020
AlU3-27 = 0000
AlU3-42 = 3395
AlU3-28 = 40A5
6.
After completing the tests, be sure to return the J3 jumper to its original position.
60 Troubleshooting
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Table 3-7. Secondary Interface SA Test
Description: These signatures check the secondary microprocessor A5U504.
Valid A5U504 ROM Firmware Revision: A.01.04
Test Setup: See Figure 3-17.
1.
Turn off the power supply and remove the top cover.
2.
To obtain a setup that allows access to components and test points on the A5 Control Board, follow the procedure
given in Table 3-3 under "A5 Control Board Setup".
3.
Connect signature analyzer CLOCK, START, STOP, and GROUND inputs and setup as shown in Figure 3-15.
4.
To place the secondary interface in the SA mode, turn on the power supply while momentarily (for 2 seconds) shorting
A5U504-1 to A5U504-20 (common).
5.
Use the signature analyzer probe to take the following signatures:
Power:
5V = lC4C
Microprocessor:
A5U504-1 = F77H
A5U504-21 = 0C98
A5U504-2 = C98P
A5U504-22 = 5PC7
A5U504-3 = 1573
A5U504-23 = 0000
A5U504-4 = P42A
A5U504-24 = 6CAP
A5U504-5 = UHF8
A5U504-25 = A339
A5U504-6 = F5UC
A5U504-26 = A319
A5U504-7 = UH8C
A5U504-27 = A339
A5U504-8 = 23UC
A5U504-28 = 0C98
A5U504-9 = 0000
A5U504-29 = lC4C
A5U504-10 = IC4C
A5U504-30 = 0000
A5U504-11 = lC4C
A5U504-31 = lC4C
A5U504-12 = C76F
A5U504-32 = 0000
A5U504-13 = U042
A5U504-33 = 0000
A5U504-14 = 2189
A5U504-34 = lC47
A5U504-15 = lC4C
A5U504-35 = 0000
A5U504-16 = lC45
A5U504-36 = 0UPU
A5U504-17 = 0010
A5U504-37 = UF7P
A5U504-18 = IC4C
A5U504-38 = 347F
A5U504-19 = lC4C
A5U504-39 = CP47
A5U504-20 = 0000
A5U504-40 = lC4C
6.
After completing the tests, be sure to return the J3 jumper to its original position.
Note
After completing this test, you can exit the SA mode only by performing a power-on reset.
Troubleshooting 61
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Post-Repair Calibration
When Required
Calibration is required annually and also whenever certain components are replaced. If components in any of the circuits
listed below are replaced, the supply must be recalibrated.
Note
For calibration procedures, see Appendix A of the Operating Manual.
Location
A10 Control Board
Component
CV/CC DACs/operational amplifiers, CV/CC control circuit amplifiers, readback
DAC/operational amplifier, readback comparators.
A1 Front Panel Assy
A1 Front Panel Board or EEPROM AlU6.
Note: If either of these front panel components is replaced, the power supply must first be
reinitialized before calibration (see "EEPROM Initialization" ) .
Inhibit Calibration Jumper
If CAL DENIED appears on the display when front panel calibration is attempted (or error code 1 occurs when GPIB
calibration is attempted on a Systems Supply), the INHIBIT CAL jumper (see Figure 3-15) is installed. This prevents the
power supply calibration from being changed. To calibrate the power supply first move this jumper from the INHIBIT CAL
position to the NORM position.
Calibration Password
In order to enter the calibration mode, you must use the correct password as described in Appendix A of the Operating
Manual. As shipped from the factory, the supply's model number (e.g., "6681") is the password. If you use an incorrect
password, PASSWD ERROR appears on the display during front panel calibration, or error code 2 occurs during GPIB
calibration, and the calibration mode is disabled. If you do not know the password, you can recover the calibration function
by restoring the preset factory calibration constants as described below.
Restoring Factory Calibration Constants
This procedure allows you to recover the factory calibration constants. The ability to do this allows you to operate the
power supply for troubleshooting and/or to recalibrate it as required. To restore the original factory calibration constants,
proceed as follows:
1.
Turn off the supply and remove the top cover.
2.
Move the jumper in test header J3 on the A1 Front Panel Board from the NORM to the FACTORY PRESET CAL
position (see Figure 3-15).
3.
Turn on the power supply and note that ADDR 5 and then PWR ON INIT appear briefly on the front panel display.
4.
When PWR ON INIT no longer appears, the supply's factory calibration constants have been restored and the password
has been changed to 0. There is no longer any password protection. You can now turn off the supply and restore the
calibration jumper to the NORM position (see Figure 3-15).
5.
Turn on the supply. You may now set a new password (if desired) and recalibrate the power supply.
62 Troubleshooting
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EEPROM Initialization
EEPROM AlU6 on the A1 Front Panel Board stores the supply's GPIB address, model number, and constants required to
program and calibrate the power supply. If either the front panel board or the EEPROM is replaced, the power supply must
be reinitialized with the proper constants by running the program listed in Figure 3-18.
When the program pauses and asks you to make a selection, respond as follows:
Initialization (I) or Factory Preset Replacement (F)? I
After the power supply has been initialized, it must be calibrated as described in Appendix A of the Operating Manual.
After calibration, transfer the new calibration constants to the EEPROM's "Factory Cal" locations as described next.
Transferring Calibration Constants To Factory Preset Locations
A newly initialized and calibrated power supply has calibration constants in operating locations but does not have the new
factory calibration constants stored in EEPROM. This procedure transfers the calibration constants into the EEPROM
FACTORY PRESET CAL locations by running the program listed in Figure 3-18.
When the initialization program pauses and asks you to make a selection, respond as follows:
Initialization (I) or Factory Preset Replacement (F)? F
The new calibration constants will then be stored. Pre-initialized and tested A1 Front Panel boards are available for Analog
Programmable "bench" series supplies. (See Chapter 5, Table 5-4 for part numbers.)
A Bench Series Supply can be initialized and the new Factory Preset calibration constants loaded by temporarily replacing
the A2 Isolator board with an A2 GPIB board. Then follow the instructions above for "EEPROM INITIALIZATION" and
also "TRANSFERRING CALIBRATION CONSTANTS TO THE FACTORY PRESET LOCATIONS" described above.
After the supply has been Initialized, Calibrated, and the new Factory Presets stored, remove the GPIB board and reinstall
the original Isolator board.
Troubleshooting 63
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10 ! Program to initialize EPROM or move factory preset data in 668xA
20 ! power supplies.
30 ! RE-STORE "INIT_668X"
40 ! Rev A.00.00 dated 09 Nov 1993
50 !
60
DIM Init_data(1:49),Model$[5],Idn$[21],Cal_data$[40]
70
INTEGER Addr(1:49),Length(1:49)
80
ASSIGN @Ps TO 705
! Supply must be at address 705
90
CLEAR SCREEN
100
!
110 Eprom_data_addr:
! Data address
120
DATA 2,6,10,14,18,19,20,24,28,32
130
DATA 36,37,38,42,46,50,54,55,56,57
140
DATA 64,68,72,76,80,116,152,153,154,155
150
DATA 156,158,160,162,163,164,165,166,167,168
160
DATA 169,170,171,172,174,176,180,184,188
170
!
180 Eprom_data_len:
! Data for word length
190
DATA 4,4,4,4,1,1,4,4,4,4
200
DATA 1,1,4,4,4,4,1,1,1,1
210
DATA 4,4,4,4,4,1,1,1,1,1
220
DATA 2,2,2,1,1,1,1,1,1,1
230
DATA 1,1,1,2,1,4,4,4,4
240
!
250 Eprom_data_6680:
!
! EEPROM data for 6680A
260
DATA 729,71,5.125,0,83,0,4.235,72,895,0
270
DATA 98,3,36,17,6.25,0,83,255,20,10
280
DATA 6680,708,94,4.13,92,128,5,255,0,0
290
DATA 1296,6680,0,20,180,20,180,175,33,98
300
DATA 115,30,20,1,58,.002701,.2,.0017346,10.2286
310
!
320 Eprom_data_6681:
!
! EEPROM data for 6681A
330
DATA 463,75,8.19,0,83,0,6.333,70,592,0
340
DATA 98,3,22.16,17.75,10.0,0,,83,255,20,10
350
DATA 6681,430,95,6.3645,92,128,5,255,0,0
360
DATA 1296,6681,0,20,180,20,180,175,33,98
370
DATA 115,30,20,1,58,.002701,.2,.0017346,10.2286
380
!
390 Eprom_data_6682:
!
! EEPROM data for 6682A
400
DATA 175,74,21.5,0,83,0,15,73,246,0
410
DATA 98,21,8.7,10,26.3,0,83,255,20,10
420
DATA 6682,162,96,15,96,128,5,255,0,0
430
DATA 1296,6682,0,20,180,20,180,175,33,98
440
DATA 115,30,20,1,127,.002701,.2,.000307,10.25
450
!
460 Eprom_data_6683:
!
! EPROM data for 6683A
470
DATA 116,74,32.8,0,83,0,23,75,164,0
480
DATA 98,21,5.5,10,40.0,0,83,255,20,10
490
DATA 6683,108,96,23,97,128,5,255,0,0
500
DATA 1296,6683,0,20,180,20,180,175,33,98
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 1 of 5)
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510
DATA 115,30,20,1,127,.002701,.2,.00042,10.25
520
!
530 Eprom_data_6684:
!
! EEPROM data for 6684A
540
DATA 93,74,41,0,83,0,29,70,131,0
550
DATA 98,21,4.6,10,50,0,83,255,20,10
560
DATA 6684,87,97,28,93,128,5,255,0,0
570
DATA 1296,6684,0,20,180,20,180,175,33,98
580
DATA 115,30,20,1,127,.002701,.2,.000333,10.234375
590
!
600
!
610
INPUT "Input Power Supply model number. Example:""6681A""",Model$
620
CLEAR SCREEN
630
!
640
RESTORE Eprom_data_addr
650
!
660
FOR I=1 T0 49
670
READ Addr(I)
680
NEXT I
690
!
700
RESTORE Eprom_data_len
710
!
720
FOR I=1 T0 49
730
READ Length(I)
740
NEXT I
750
!
760
SELECT TRIM$(UPC$(Model$))
! Delete leading/trailing zeros and set to uppercase
770
CASE "6680A"
780
RESTORE Eprom_data_6680
790
CASE "6681A"
800
RESTORE Eprom_data_6681
810
CASE "6682A"
820
RESTORE Eprom_data_6682
830
CASE "6683A"
840
RESTORE Eprom_data_6683
850
CASE "6684A"
860
RESTORE Eprom_data_6684
870
!
880
CASE ELSE
890
PRINT "Model number not found. Program is for models"
900
PRINT "Keysight 6680A, 6681A, 6682A, 6683A and 6684A only"
910
STOP
920
END SELECT
930
!
940
FOR I=1 T0 49
! Read model dependent data
950
READ Init_data(I)
960
NEXT I
970
!
980
OUTPUT @Ps;"*CLS"
! Clears power supply registers
990
!
1000
OUTPUT @Ps;"CAL;STATE ON,"
! Turn on cal mode, "0" passcode
1010
!
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 2 of 5)
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1020
GOSUB Ps_error
! Error if passcode is not "0"!
1030
IF Err THEN
1040
OUTPUT @Ps;"*IDN?"
! Get data from model # location
1050
ENTER @Ps;Idn$
1060
Model=VAL(Idn$[POS(Idn$,",")+1] )
1070
ELSE
1080
GOTO Start
1090
END IF
1100
!
1110
OUTPUT @Ps;"CAL:STATE ON,";Model
! Turn on cal mode, passcode =
1120
! data at model number location
1130
!
1140
GOSUB Ps_error
! Error if passcode is not same as
1150
! data at model # location
1160
IF Err THEN
1170
OUTPUT @Ps;"CAL:STATE ON,";Model$[1,4]
! Turn on cal mode, passcode =
1180
! model #
1190
GOSUB Ps_error
1200
IF Err THEN
1210
PRINT "Change pass code to the power supply model # or zero then restart the program."
1220
STOP
1230
ELSE
1240
GOTO Start
1250
END IF
1260
END IF
1270
!
1280 Start:
!
1290
!
1300
!
1310
INPUT "Select Initialization (I) or Factory preset replacement (F). ",Sel$
1320
CLEAR SCREEN
1330
SELECT (UPC$(Sel$))
1340
CASE "I"
! Select Initialization
1350
GOTO Init_eeprom
1360
CASE "F"
! Select install new factory data
1370
GOTO Fact_preset
1380
CASE ELSE
1390
BEEP
1400
GOTO Start
1410
END SELECT
1420
!
1430 Init_eeprom:
!
1440
PRINT "Initializing EEPROM"
1450
!
1460
FOR I=1 TO 49
1470
OUTPUT @Ps;"DIAG:EEPR '';Addr(I);'','';Length(I);'','';Init_data(I)
1480
NEXT I
1490
GOTO Cal_off
1500
!
1510
!
1520 Fact_preset:
!
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 3 of 5)
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1530
CLEAR SCREEN
1540
PRINT "This program should ONLY be completed if your power supply"
1550
PRINT "EEPROM has been replaced or a component that will effect"
1560
PRINT "the calibration AND the alignment of voltage, overvoltage"
1570
PRINT "and current is complete AND unit has passed the performance"
1580
PRINT "test.
Enter C to continue, any other key to abort."
1590
INPUT Cont_prog$
1600
IF (UPC$(Cont_prog$))< >"C" THEN GOTO Cal_off
1610
!
1620
CLEAR SCREEN
1630
PRINT "Transferring calibration data to factory preset locations."
1640
!
1650 Fact_cal_sour:
! Address of factory calibration data source
1660
DATA 2,6,68,72,20,24,76,80,150
1670
!
1680 Fact_cal_dest:
! Address of factory calibration data destination
1690
DATA 84,88,92,96,100,104,108,112,116
1700
!
1710 Fact_cal_len:
! Length of factory calibration data
1720
DATA 4,4,4,4,4,4,4,4,1
1730
!
1740
RESTORE Fact_cal_sour
1750
FOR I=1 TO 9
1760
READ Cal_sour_addr(I)
1770
NEXT I
1780
!
1790
RESTORE Fact_cal_dest
1800
FOR I=1 T0 9
1810
READ Cal_dest_addr(I)
1820
NEXT I
1830
!
1840
RESTORE Fact_cal_len
1850
FOR I=1 T0 9
1860
READ Cal_length(I)
1870
NEXT I
1880
!
1890
FOR I=1 T0 9
! Locations of good data
1900
OUTPUT @Ps;"DIAG:EEPR?";Cal_sour_addr(I);",";Cal_length(I)
! Read good data
1910
ENTER @Ps;Cal_data$
! Enter good data
1920
OUTPUT @Ps;"DIAG:EEPR";Cal_dest_addr(I);",";Cal_length(I); ",";Cal_data$
! Write good data to factory preset locations
1930
NEXT I
1940
!
1950
!
1960 Cal_off
1970
CLEAR SCREEN
1980
OUTPUT @Ps;"CAL:STATE OFF"
! Turn off cal mode
1990
!
2000
GOSUB Ps_error
! Check for errors
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 4 of 5)
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2010
IF Err THEN
2020
PRINT "An error occurred during the EEPROM read/write, Check for"
2030
PRINT "programming errors. Initialization data may be incorrect."
2040
STOP
2050
END IF
2060
!
2070
PRINT "Operation complete. Program stopped."
2080
STOP
2090
!
2100 Ps_error:
! Error handling subroutine
2110
OUTPUT @Ps;"SYST:ERR?"
! Check for errors
2120
ENTER @Ps;Err
2130
RETURN
2140
!
2150
END
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 5 of 5)
Disassembly Procedures
Shock Hazard: To avoid the possibility of personal injury, remove the power supply from service before
removing the top cover. Turn off the ac power and disconnect the line cord, GPIB cable, load leads, and
remote sense leads before attempting any disassembly. Any disassembly work must only be performed by
a qualified support technician.
Observe that the DC RAIL assembly LEDs (DS420 & DS421) are fully extinguished (no live voltages
present) before attempting any disassembly work. Any disassembly work must only be performed by a
qualified support technician.
Cable connections are shown in Figure 6-2 of Chapter 6 and component part numbers are given in Chapter 5. Reassembly
procedures are essentially the reverse of the corresponding disassembly procedures.
Tools Required
þ
TORX screwdriver size T-15 (for most all retaining screws).
þ
TORX screwdriver size T-20 (for power supply carry straps).
þ
Seven (7) mm metric hex driver (to remove GPIB read connector).
þ
Pencil, paper, and labels to make notes to aid in the reinstallation of components.
þ
Work at a static-free station such as a table covered with static-dissipative laminate or with a conductive table mat
(Keysight P/N 9300-0797, or equivalent) using a conductive wrist strap where necessary, such as, Keysight P/N
9300-0969 or 9300-0970.
68 Troubleshooting
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Top Cover
1.
2.
Remove the four screws that secure the carrying straps (two TORX 20 screws on each side). These same screws secure
the cover to the chassis.
Spread the bottom rear of the cover, and then pull the cover backwards towards the rear of the power supply to
disengage it from the front panel.
Shock Hazard: Hazardous voltage can exist inside the power supply even after it has been turned off.
Check the INPUT RAIL LED (A4CR402) under the RFI shield (see Figure 3-18 end of this section for
LED location). If the LED is on, there is still hazardous voltage inside the supply. Wait until the LED goes
off (approximately 7 minutes after power is removed) before proceeding.
Removing Protective RFI Shield (Galvanized Sheet Metal)
Once you remove the top cover of the power supply, you will see the RFI galvanized sheet metal cover preventing the
power supply from emanating RFI fields. The RFI shield covers most components and circuit boards, as well as, many of
the chassis-mounted components. You must remove this shield in order to gain access to the inside of the power supply.
Remove the shield as follows:
1.
2.
3.
4.
5.
There are approximately 21 screws holding the cover to the frame.
There are two screws at the top of the shield that secure a retaining clip for the GPIB board. You do not need to remove
these screws, simply loosen the screws and slide the GPIB retaining clip backwards free of the GPIB board.
Remove all shield securing screws using a TORX T-15 screwdriver and save for later reinstallation .
Lift the RF shield out of the chassis.
When DC RAIL LEDs are extinguished, it is safe to work inside the power supply. (See Warning note above.)
Note
The following procedures describe the removal of most of the circuit boards within the power supply.
Once the GPIB board is removed, you will have access to the A4 AC Input Assembly and the A5 DC Rail
Assembly. Similarly, once the A10 control board is removed along with the Rectifier HS you will have
access to other components and boards within the supply.
It is recommended that when you disconnect any wires and/or cable connectors you should immediately
label them to simplify their reinstallation later.
GPIB Board
To remove the GPIB board, disconnect the cables from the following connectors at the GPIB board:
1.
2.
3.
4.
5.
6.
7.
Disconnect the cable going to connector P101.
Disconnect phone cable going to J107.
Disconnect phone cable going to J107.
Disconnect phone cable going to J108.
Remove two (2) holding screws at read of chassis holding GPIB board in place.
Using a 7 mm driver, remove the two (2) screws holding the GPIB connector at rear of chassis.
The GPIB board can now be lifted out from the chassis.
Troubleshooting 69
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A4 AC Input Assembly
To remove the A4 AC Input Board first remove the GPIB board then disconnect these cables from the following connectors
at the GPIB board:
1.
2.
3.
4.
5.
6.
7.
Disconnect the cables going to connector J417 and J420.
Disconnect the cable going to connector J419.
Remove the three (3) fuse assemblies inside rear of power supply to free the wires going to E400, E401, and E402 on
the AC Input Board.
Remove the holding screw at the center of board just to the left of the 3-phase choke.
Disconnect phone cable going to J108.
Slide the board to the right and lift out.
Other wires going to the board can now be removed/unsoldered.
A5 DC RAIL Assembly
Disconnect these cables from the following connectors at the A5 DC RAIL board:
1.
2.
3.
Disconnect the cables going to four connectors: J430, J431, J432, and J433.
Remove the four (4) holding screws TORX T-15 holding the A5 DC RAIL board in place.
Lift the board out and remove/desolder any other wires preventing the board from being removed.
A6 BIAS Assembly
Disconnect the cables from the following connectors at the A6 BIAS Assembly board:
1.
2.
3.
4.
Disconnect cables from connectors J809, J821, J830, and J831 on the A6 BIAS Board.
Remove two (2) holding screws at top side of board.
Slide board upward until board is free of slotted standoffs. There is one of these standoffs at the top of the board and
two at the bottom. Wiggle the board slightly to clear all three standoffs then lift the board out.
Once the board is free from its restraining standoffs, you can proceed to remove/unsolder any other wires/cables as
necessary to remove the A6 BIAS Board entirely.
Note
It is recommended that you label any connectors you disconnect from the A6 BIAS Board to facilitate the
reinstallation of these cables/wires back to their correct locations later. If you should have trouble later in
determining which cable goes to which connector during reinstallation, refer to the cabling diagram in
Chapter 6.
A3 FET Board
Follow this procedure to remove the A3 FET Board:
1.
2.
3.
4.
5.
Remove the four (4) holding screws that secure the two black caps over the Rectifier HS assembly.
Once these caps are removed, you can remove the Rectifier HS which faces the A3 FET Board.
Disconnect two connectors, P430 and P431, at the A5 DC RAIL assembly.
Disconnect two connectors P/O cable assemblies P/N 5080-2283, at the A5 DC RAIL assembly.
You can now lift out the A3 FET board and remove/unsolder any other wires necessary to fully remove the A3 board.
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A10 Control Assembly
Disconnect the cables from the following connectors at the A10 DC RAIL board:
1.
2.
3.
4.
5.
Disconnect the ribbon cable going from to the A6 Bias board. This cable connects to J509 on the A10 board but it is
easier to disconnect it at the A6 Bias Board.
Disconnect cables from connector J507 (phone) and connectors J510, J511, J512, and J513 on the A10 Control Board.
At rear of power supply, remove holding screw directly above fan. This screw holds the frame and A10 control board
in place.
At rear of power supply unplug connector DIG CNTL from A10 Control Board.
Move board to the right and lift board and associated steel frame out of chassis.
Front Panel Assembly
1.
2.
3.
4.
5.
6.
Peel off vinyl trim (one strip on each side of front panel) to access the four screws that secure the front panel assembly
to the chassis.
Remove the four screws (two on each side) using a size T-10 TORX.
Disconnect phone cable W5 from J6 on the A1 Front Panel Board.
Record the color code and the location of each of the four wires connected to line switch S1.
Disconnect the wires from the switch assembly.
Remove the front panel assembly.
S1 Line Switch
1.
2.
Remove Front Panel Assembly and disconnect switch wires as described in that procedure.
Release the switch locking tabs by pressing them inward against the body of the switch and removing the switch.
A1 Front Panel Board
1.
2.
Remove the Front Panel Assembly and disconnect the switch as described under "Front Panel Assembly".
Disconnect LCD display ribbon cable W2 from J2 on the A1 Front Panel Board.
Note
3.
Use a small Allen wrench (0.050") to loosen the set screws that are inset in the knobs. (These are the AlG1 and AlG2
Voltage/Current control shafts that extend through the front panel.) Remove knobs and shaft bushings.
Note
4.
5.
When reinstalling the LCD ribbon cable, be sure to line up the "stripe" of the ribbon cable with pin 1
on J2.
Be careful not to unscrew the knob set screws too far out as they can easily fall out of the knob and
become lost.
Remove screw (if installed) that secures board to the Front Panel Assembly. The screw is located near J4 on the Front
Panel Board.
Lift tab (near J6 on front panel board) and slide left to release board from the A1 Front Panel Assembly and remove
board.
Troubleshooting 71
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A1DSP1 LCD Display
1.
2.
Remove the A1 Front Panel Board as described in that procedure.
Remove the nuts securing the LCD display to the front panel assembly and remove the LCD and attached ribbon cable
(see CAUTION below). (When reinstalling this cable, be sure to line up the cable stripe over the LCD connector pin
marked with a square.)
The display connector is fragile. When removing the cable from the LCD display, carefully rock the
cable connector back and forth while gently pulling it back.
A1G1 and A1G2 Rotary Controls
1.
2.
3.
Remove the A1 Front Panel Board as described in that procedure.
Remove the AlG1 and AlG2 cables from connectors A1J4 and A1J5.
Remove nuts securing the AlG1 AlG2 controls to the board and remove controls.
A1KPD Keypad
1.
2.
Remove the A1 Front Panel Board as described in that procedure.
With board removed, keypad can easily be lifted out of the Front Panel Assembly.
Output Bus Boards A7, A81 and A9 & Chassis Components
Note
To remove the A7 Snubber Board, A8 Fast Sense Assembly, A9 Downprogrammer and other chassis
mounted components, first remove the A10 Control Board frame assembly and the two Rectifier Heat
Sinks described earlier. Once the heat sinks are removed you will have access to the A7, A8, and A9
boards as well as other chassis mounted components.
Should you have any difficulty in removing power supply components or boards, contact the Keysight
Technologies Support Line for help.
Shock Hazard: Hazardous voltage can exist inside the power supply even after it has been turned off.
Check the INPUT RAIL LED (A4CR402) under the RFI shield (see Figure 3-18 end of this section for
LED location). It the LED is on, there is still hazardous voltage inside the supply. Wait until the LED goes
off (approximately 7 minutes after power is removed) before proceeding.
72 Troubleshooting
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Figure 3-18. Component Locations (Top Cover and RFI Shield Removed)
Troubleshooting 73
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5185-1342
Figure 3-19. 5-Inch Front Panel Frame Assembly
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Figure 3-20. 3-Inch Front Panel Frame Assembly
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Figure 3-21. Assembly A10, Exploded View
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Figure 3-22. Assembly A10, Exploded View (6680A, 6681A)
Troubleshooting 77
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Figure 3-23. Assembly A10, Exploded View (6682A, 6683A, 6684A)
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Figure 3-24. Three-Phase Line Choke Subchassis Wiring
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Figure 3-25. 24 Volt Fan Transformer
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4
Principles Of Operation
Introduction
Figure 4-3 (at the end of this chapter) is a block diagram showing the major circuits within the power supply. The power
supply consists of the following circuits:










A1 Front Panel Board ckts.
A2 GPIB ckts.
A10 Control Board including the secondary interface ckts, CV/CC control ckts, switching/downprogramming control
ckts.
Power circuits on the A4 AC Input Board.
A3 FET Assembly ckts.
A5 DC Rail Board ckts.
Output bus circuits which include the A7 Snubber Board, A8 Slow Sense Board, and A9 Downprogrammer Board
ckts.
Output rectifiers and filter capacitors.
Ferrite cores mounted on the output bus form the output filter inductors.
A6 Bias Board supply which supplies low-voltage, low-power, bias voltages where required.
Each block in Figure 4-3 identifies a schematic diagram in Chapter 6 where the circuits are shown in detail. You can refer
to the component location diagrams in Chapter 6 to locate specific components mentioned in this description. Chapter 6
also has a cabling diagram showing the circuit board interconnections.
A2 GPIB Board
Circuits on the A2 GPIB board provide the interface between the GPIB controller and the power supply. All
communications between the power supply and the GPIB controller are processed by the GPIB interface and primary
microprocessor circuits on the A2 board.
The primary microprocessor circuits (microprocessor, U114, ROM U106, and RAM U108) decode and execute all
instructions and control all data transfers between the GPIB controller and the Secondary Interface on the A10 Control
Board. The primary microprocessor also processes measurement and status data received from the Secondary Interface.
A UART (universal asynchronous receive/transmit) IC (U112) on the A2 board converts data between the primary
microprocessor's 8-bit, parallel bus and the serial I/O port. The serial data is transferred between the primary interface and
the secondary interface via a programmed GAL (gated array logic) IC (U119) and optical isolator ICs (U110/U111).
These ICs isolate the primary interface circuits (referenced to earth ground) from the secondary interface circuits
(referenced to power supply common). The GAL IC also provides a serial I/O port to the A1 Front Panel Board to enable
front panel control of the power supply.
A serial link interface IC (U109) on the A2 GPIB Board allows up to sixteen supplies to be connected together and
programmed from one GPIB address. The first supply is the only supply connected directly to the GPIB controller and is
set to the primary GPIB address. The remaining supplies are set to secondary addresses and are linked (daisy chained)
together via the Jl/J2 phone jacks at the rear of each supply. The serial link configuration is described in the Power Supply
Operating Manual.
Principles Of Operation 81
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A digital control interface on the A2 GPIB Board provides the following power supply functions:

Relay link.

Digital 1/0.

Remote inhibit (INH).

Discrete fault indicator (FLT).
An optical isolator IC (U113) isolates the FLT output signal common from the external fault circuit common. The desired
digital interface function is selected by placing a jumper in a header (J106) on the A2 GPIB Board. Appendix D in the
Power Supply Operating Manual describes how to select one of these functions and how to make the appropriate external
connections to the DIG CNTL connector on the supply's rear panel. Another jumper position on the header selects the SA
(signature analysis) mode, which is used for troubleshooting (see Chapter 3).
The A2 Board has a bias supply regulator IC (U121) that provides +5V (with respect to earth ground) for the primary
interface circuits and the bias voltage for the front panel board circuits, the LCD, and the keypad. The A2 Board also has a
line or bias voltage detector IC (U101) that generates a power clear signal (PCLR). This signal initializes certain primary
interface and front panel circuits when normal ac line voltage is applied, and also shuts these circuits down when the line
voltage drops below the required minimum.
A1 Front Panel Assembly
The power supply A1 Front Panel Assembly contains a circuit board, keypad, liquid crystal display (LCD), and the power
on/off switch.
The Front Panel Circuit Board A1 contains microprocessor circuits (microprocessor U3 and ROM U4) that decode and
execute all front panel keypad commands. These are transferred to the power supply output via the serial I/O port to the A2
board GAL (gated-array logic) IC and isolators, and to the secondary interface circuits on the A10 Control Board. The front
panel microprocessor circuits also process power supply measurement and status data received from the serial I/O port.
This data is displayed on the LCD.
IC EEPROM, U6, (electrically-erasable, programmable, read-only memory) on the A1 Front Panel Board stores data and
configuration information. This information includes calibration constants, GPIB address, the present programming
language, and model-dependent data such as the minimum and maximum values of voltage and current.
One of the EEPROM storage locations holds a checksum value used to verify the integrity of this EEPROM data. Access to
the calibration data in the EEPROM is controlled by the combination of a password and jumper options on a header (J3)
located on the A1 board (see Post-Repair Calibration in Chapter 3).
The power supply can be calibrated manually using the front panel keys, or via the GPIB bus with SCPI (Standard
Commands for Programmable Instruments) commands. The calibration procedure is in Appendix A of the Power Supply
Operating Manual).
A10 Control Board
The A10 Control Board contains the Secondary Interface, CV/CC Control Circuits, Readback Circuits, PWM Switching
Circuits and OV/Downprogramming Circuits. These circuits are shown schematically in the A10 Control Board schematic.
Secondary Interface (P/O A10 Board)
These circuits are shown in detail on the A10 Control Board schematic and include the Secondary Microprocessor (U506),
Programmed GAL (U505), three DAC/OpAmp circuits (U510-U515), Readback Comparator circuits (U516, U517) and
OV/Shunt DAC OpAmp circuit, (U520, U521).
82 Principles Of Operation
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The Secondary Microprocessor translates serial data received from the A2 board into parallel 12 bit data. The data bus is
connected directly to the four DAC/OpAmp circuits. Under control of the lip the selected DAC converts the bus data into
an analog signal. The DAC reference circuit (U503, U504) provides a +10V reference for the CV and CC DACs and a
-11.6V reference for the readback DAC. Zener VR501 provides a-6.2V reference for the OV Shunt DAC.
The CV DAC/OpAmp (U510, U513) converts the programmed voltage value from the bus or front panel into the CVPROG
signal. CVPROG is sent to the CV Error Amp and compared with the VMON signal to control the magnitude of the output
voltage in the CV mode. The range of CVPROG is 0 volts to -10 volts, which corresponds to the zero-to-full-scale output
voltage range of the supply.
The CC DAC/OpAmp (U511, U514) converts the programmed current value from the bus or front panel into the CCPROG
signal. CCPROG is sent to the CC Error Amp and is compared with the IMON signal to control the magnitude of the output
current in the CC mode. The range of CCPROG is 0 volts to -10 volts, which corresponds to the zero-to-full-scale output
current range of the supply.
The Readback Comparators (U516, U517) operate with the Readback DAC/OpAmp (U512, U515) to return the following
signals to the P:






The monitored output voltage (VMON).
The monitored output current (IMON).
The ambient temperature (AMB_SENSE).
The programmed voltage value (CVPROG).
The programmed current value (CCPROG).
The fan detector (FAN_DEW).
The readback DAC circuit is controlled by the P to successively approximate (to 12-bit resolution) the value of each
signal monitored. The CVPROG and CCPROG signals are used during selftest to check DAC/OpAmp operation. The P
monitors the fan speed and ambient temperature and generates the FAN_PWM control signal to adjust fan speed depending
upon the ambient temperature measured internally in the power supply.
A dual DAC, Shunt-Trim/OV, Amplifier circuit (U520, U521) performs two functions. One is to convert the programmed
overvoltage value from the bus or front panel into the OVREF signal. The OVREF signal is compared by U502 with the
output voltage. Second, the Shunt Trim DAC calibrates the IMON signal by sampling the current flowing through
current-sense resistor (R900) on the output power bus together with the TRIM input signal.
Figure 4-1. AC Calibration of IMON
During power initiation, the secondary processor generates PWM DISABLE to the power supply's output off for 10
seconds. After 10 seconds PWM DISABLE is removed and the supply's output can be programmed.
CV/CC Control (P/O A10 Board) These circuits are shown in detail on the A10 Control Board schematic and include the
CV (constant voltage) and CC (constant current) control loops. The power supply must act as either a CV or CC supply for
Principles Of Operation 83
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any value of load impedance. Switching between CV and CC is done automatically by the CV/CC control circuits at a
value of load impedance equal to the ratio of the programmed voltage value to the programmed current value.
A low-level CV or CC signal is generated by the applicable status comparator (P/O U502) and returned to the secondary
processor to indicate that the corresponding mode, CV or CC, is in effect.
In CV mode, an OR gate diode (D652) conducts and the CV loop regulates the output voltage. A CV error amplifier (P/O
U621) compares the programmed voltage signal CVPROG to VMON which is the output signal from the V_DIF
amplifier(P/O U621). The range of VMON is 0 volts to +10 volts which corresponds to the zero-to-full-scale output voltage
of the supply. If the output voltage exceeds the programmed voltage the OR GATE signal goes low causing the output
voltage to decrease to the programmed value.
Conversely, if the output voltage is less than the programmed voltage, the OR GATE signal goes high causing the output
voltage to increase to the programmed value. An externally applied dc signal, VPROG, can be used to program the output
voltage. A 0 volt to -5 volt VP level produces a proportional zero-to-full-scale output voltage.
In CC mode, an OR gate diode (D651) conducts and the CC loop regulates the output voltage. A CC error amplifier (P/O
U620) compares the programmed voltage signal CCPROG to IMON which is the output signal of 2nd I_AMP (P/O U620).
The range of IMON is 0 volts to +10 volts which corresponds to the zero-to-full-scale output voltage of the supply. If the
output current exceeds the programmed current, the OR GATE signal goes low causing the output current to decrease to the
programmed value.
Conversely, if the output current is less than the programmed current, the OR GATE signal goes high causing the output
current to increase to the programmed value. An externally applied dc signal, IPROG, can be used to program the output
current. A 0 volt to -5 volt IP level produces a proportional zero-to-full-scale output current.
Switching/Downprogramming Control (P/O A10) These circuits include a Ramp Generator, Divider /Deadtime Latch, Fast
Sense Differential Amplifier, Pulse Width Modulator, Summing Comparator, Down-Programmer Control and OV
Comparator circuits.
The Divider/Deadtime Latch (U600, U601, U602) divides the 2-MHz ALE_CK signal from the Secondary P and supplies
40 KHz pulses to the Ramp Generator (U607) and ON Latch ( U604).
The OR-GATE signal (CV or CC control signal as previously described) is summed with the 40 KHz triangular waveform
produced by the Ramp Generator. An input from the Fast Sense Differential Amplifier is also summed to compensate for a
sudden transient in the rectified output.
The width of the output pulses from the Summing Amplifier vary as the OR-GATE control signal increases or decreases.
These pulses are applied to the Pulse-Width Modulator (U603) via the On Latch. The PWM generates the square wave
pulses that are applied to the A3 FET assembly to turn the FET switches on and off. The Deadtime Latch resets the ON
Latch to provide a minimum off time for the FET switches.
The OV circuit compares the output voltage level with the OVREF signal which represents the programmed overvoltage
level. When the output voltage exceeds the programmed OV value, the downprogrammer circuits are activated and the FET
switches are turned off
The Downprogrammer control circuit generates control signal DP CONTROL whenever an OV or disable condition has
been detected, or when the output voltage exceeds the programmed value. DP CONTROL causes the downprogrammer
FETs (Q980, Q981) on the A9 Downprogrammer/Fast Sense board to conduct and conduct current away from the load.
84 Principles Of Operation
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A4 AC Input Board
The A4 Input Board contains the Inrush-Current Limit relay (K401), Main Power Relay (K402), and current-limiting
resistors (R407, R408). On power-on, the current-limit relay (K401) closes allowing the dc rail capacitors to charge under a
controlled condition. This applies ac voltage to the A6 Bias Board. After the turn-on initialization period (approximately 10
seconds), the main relay (K402) closes, shorting out the current-limit resistor.
A5 DC Rail Board
The A5 DC Rail board contains the full-wave, three-phase, rectifiers and the input filter circuits. The ac mains are full-wave
rectified by D420-D425 and converted to two, 300-volt dc rails by filter capacitors, C423-C426, and by two range select
connectors. In range 1 (180-235Vac), J438 connects the two DC rails, called Rail #1 and Rail #2, in parallel. Each rail
supplies 300Vdc to the A3 FET board via J430 and J431. In Range 2 (360-440Vac), J439 connects the two DC rails in
series. Each rail still supplies 300 Vdc to the A3 FET board via J430 and J431.
The A5 DC Rail board also contains the bias transformer and primary range select connectors J436 (Range 1) and J437
(Range 2). There are two LEDS (DS420, DS421) which light when more than 40Vdc is present on the dc rails.
As a precaution always disconnect power supply from ac mains and wait 7 minutes before handling dc rail
board. Be certain that the LEDs are completely extinguished.
The +24 auxiliary bias fuse, F420, and the standard bias fuse, F421, are located on the dc rail board.
A3 FET Board
The A3 FET board consists of two power FET stages connected between the +rail and -rail voltages, and connected across
the FET stages is a chassis mounted power transformer. The entire circuit represents an H-bridge configuration. A complete
stage consists of eight, power FETs and two, bridge-driver ICs. The power FETs are mounted on but isolated from the heat
sink assembly. The two power FET stages are isolated from each other.
The DRIVElA, lB and DRIVE2A, 2B pulses, received from the A10 Control board, are used by the bridge drivers (U201,
U202, U301, U302) to derive control pulses for the FET switches. The width of the pulses determines the ON time of the
FET switches, thereby determining the magnitude of the output voltage or current. DRIVElA pulses turn on one set of
+RAIL (Q301, Q311) and -RAIL (Q303, Q333) FETs, causing current to flow through power transformer, T900, in one
direction. DRIVE2A pulses turn on the other set of +RAIL (Q304, Q344) and -RAIL (Q302, Q322) FETs causing current
to flow through T900 in the opposite direction. The FET on/off periods are controlled by the duty-cycle detect and the
peak-current detection circuits. If the output attempts to change, regulation is accomplished by the CV/CC control circuits
on the A10 Control board. These circuits vary the width of the drive pulses and the duration of the FET on/off periods.
Principles Of Operation 85
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Figure 4-2. 1ST Stage of the FET H-Bridge Configuration
Output Circuits
The output circuits include the following circuits:








Chassis mounted components.
Two power transformers, T900/T901.
Two inductors, L900/L901.
Four rectifiers, D900 through D903.
Output capacitors.
A7 Snubber board mounted to the heat sink.
A8 Fast Sense board.
A9 Slow/Downprogrammer board and output bus bars.
Each combination of power transformers, T900/T901, and rectifiers, D900/D903, couples the output pulses from the A3
FET board. The output of each transformer/rectifier combination is connected in parallel before being applied to the output
filter. The output filter assembly consists of bus bars with the filter capacitors bolted to them. The filter chokes, L902
through L906, consist of ferrite cores enclosing the bus bar. The current-sense resistor, R900, is part of the positive-output
bus bar.
86 Principles Of Operation
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ON /OFF
Figure 4-3. Keysight Series 668xA Power Supply, Block Diagram
Principles Of Operation 87
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5
Replaceable Parts
INTRODUCTION
Chapter Organization
This section lists the replaceable electrical and mechanical parts for the Keysight 668xA series power supplies. (Component
location diagrams are located in Chapter 6.) The lists consist of tables organized by assemblies as follows:
Assembly
See
Main chassis *
Table 5-3
A1 Front Panel EBoard
Table 5-4
A2 GPIB Board
Table 5-6
A3 FET Board
Table 5-7
A4 AC Input Board
Table 5-8
A5 DC Rail Board
Table 5-9
A6 Bias Board
Table 5-9
A7 Snubber Board
Table 5-11
A8 Fast Sense Board
Table 5-9
A9 Down Programming/Slow Sense Board
Table 5-9
A10 Control Board
Table 5-10
* The locations of circuit board assemblies and chassis-mounted components are shown in Fig 3-20.
Reading the Tables
Each table lists electrical components alphabetically by reference designator and provides the Keysight part number
followed by the part description. Mechanical parts are placed after the electrical parts and listed alphabetically by part
description. Unless otherwise specified, a listed part is used in all models of the series. Model-specific parts are tabulated
by model number under the reference designator. The reference designators are defined in Table 5-1. Abbreviations used in
parts descriptions are explained in Table 5-2.
A
B
C
CR
D
DSP
F
assy
bd
blvl
gnd
lg
assembly
blower (fan)
capacitor
thyristor/SCR
diode
display (LCD)
fuse
assembly
board
belleville
ground
long
Table 5-1. Part Reference Designators
J
jack
SW
K
relay
T
L
inductor
TB
P
plug
U
Q
transistor
VR
R
resistor
W
RT
thermal resistor
Y
Table 5-2. Part Description Abbreviations
M
metric
sq
square
mch
machine
submin subminiature
mm
millimeter
thk
thick
mtg
mounting
thrd
thread
PCB
pc board
w/
with
switch
transformer
terminal block
integrated circuit
voltage regulator
cable or jumper
crystal oscillator
w/o
xfmr
xtal
without
transformer
crystal
Replaceable Parts 89
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How to Order Parts
You can order parts from your local Keysight Technologies Sales and Support Office (see the list of offices in the back of
this manual). When ordering a part, please include the following information:
 the Keysight part number
 the desired quantity
Ref. Desig.
 the part description
 the model number of the power supply (for example, Keysight 6682A)
Table 5-3. Main Chassis, Replaceable Parts
Keysight Part No.
Description
ASSEMBLIES & SUBASSEMBLIES
A1
5060-3553
5060-3542
5063-4851
5060-3540
5060-3543
5060-3544
5060-3541
A2
A3
A4
A5
A6
A7
6680A
6681A
6682A
6683A
6684A
A8
A9
6680A
6681A
6682A
6683A
6684A
A10
6680A
6681A
6682A
6683A
6684A
TESTED FRONT PANEL/KEYPAD
TESTED KEYPAD PCB ASSY.
TESTED GPIB PC ASSY.
TESTED FET ASSY.
TESTED AC INPUT BOARD ASSY.
TESTED DC RAIL BOARD ASSY.
TESTED BIAS PC ASSY.
06680-60021
06681-60021
06682-60021
06683-60021
06684-60021
SNUBBER PCB ASSY.
SNUBBER PCB ASSY.
SNUBBER PCB ASSY.
SNUBBER PCB ASSY.
SNUBBER PCB ASSY.
FAST SENSE PCB
06680-60022
06681-60022
06682-60022
06683-60022
06684-60022
DOWN PROGRAMMER / SLOW SENSE PC
DOWN PROGRAMMER / SLOW SENSE PC
DOWN PROGRAMMER / SLOW SENSE PC
DOWN PROGRAMMER / SLOW SENSE PC
DOWN PROGRAMMER / SLOW SENSE PC
06680-61020
TESTED CONTROL PCB ASSY.
06681-61020
TESTED CONTROL PCB ASSY.
06682-61020
TESTED CONTROL PCB ASSY.
06683-61020
TESTED CONTROL PCB ASSY.
06684-61020
TESTED CONTROL PCB ASSY.
ELECTRICAL PARTS
C423, 424, 425, 426
C900
6680A
6681A
6682A
C901, 902, 903, 904, 905
6680A
6681A
6682A
6683A
6684A
C906
6680A
6681A
0180-4369
C-F 1500uF 400V
0180-4516
0180-4532
0180-4615
CAP 33000uF 7.5V
CAP 22000uF 16V
CAP 18000uF 28V
0180-4516
0180-4532
0180-4615
0180-4596
0180-4597
CAP 33000uF 7.5V
CAP 22000uF 16V
CAP 18000uF 28V
CAP 13000uF 45V
CAP 7.200uF 55V
0180-4516
0180-4532
CAP 33000uF 7.5V
CAP 22000uF 16V
90 Replaceable Parts
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Ref. Desig.
C907
6680A
6681A
6682A
6683A
6684A
C920, 921,922,923,924,925
6682A, 6683A, 6684A
D900
6680A, 6681A
D900A,B
6682A
6683A, 6684A
D901
6680A, 6681A
D90lA,B
6682A
6683A, 6684A
D902, 903
6680A, 6681A
L900, 901
6680A, 6681A
6682A
6683A
6684A
L902, 903
L904, 905, 906
Q981, 982
R900
6680A
6681A
6682A
6683A
6684A
T900, 901
6680A
6681A
6682A
6683A
6684A
Table 5-3. Main Chassis, Replaceable Parts
Keysight Part No.
Description
0180-4516
0180-4532
0180-4615
0180-4596
0180-4597
CAP 33000uF 7.5V
CAP 22000uF 16V
CAP 18000uF 28V
CAP 13000uF 45V
CAP 7.200uF 55V
0160-4183
CAP 1000pF 250V
1906-0396
SHOTTY RECTIFIER
1906-0397
1906-0398
SHOTTY RECTIFIER
SHOTTY RECTIFIER
1906-0396
SHOTTY RECTIFIER
1906-0397
1906-0398
SHOTTY RECTIFIER
SHOTTY RECTIFIER
1906-0396
SHOTTY RECTIFIER
06681-80001
06681-80004
06681-80005
06681-80006
5080-2257
9170-1571
1855-0834
CHOKE - OUTPUT
CHOKE - OUTPUT
CHOKE - OUTPUT
CHOKE - OUTPUT
CORE
CORE
POWER MOSFET
5080-2296
5080-2297
06682-80002
5080-2324
5080-2324
SHUNT-CURRENT
SHUNT-CURRENT
SHUNT-CURRENT
SHUNT-CURRENT
SHUNT-CURRENT
9100-5042
POWER TRANSFORMER
9100-5043
POWER TRANSFORMER
9100-5086
POWER TRANSFORMER
9100-5085
POWER TRANSFORMER
9100-5076
POWER TRANSFORMER
MECHANICAL PARTS
06652-00005
06680-20001
06680-20002
06680-80003
06681-80003
06682-80001
06683-80001
06684-80001
5185-1343
1252-1488
1252-3698
BUS BAR
BUSS BAR BLOCK
BUSS/FET BLOCK
NAMEPLATE front panel model description
NAMEPLATE front panel model description
NAMEPLATE front panel model description
NAMEPLATE front panel model description
NAMEPLATE front panel model description
CABLE (ac line switch to bias board)
TERM-BLK-4 POS
CONNECTOR
Replaceable Parts 91
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Ref. Desig.
Table 5-3. Main Chassis, Replaceable Parts (continued)
Keysight Part No.
Description
2110-0910
FUSE (see 5060-3513 )
2110-0911
FUSE (see 5060-3512 )
3160-0419
FAN FINGER GUARD
3160-0571
FAN-TUBEAXIAL
5001-0538
TRIM-SIDES
5001-0539
TRIM SIDES,FRENCH GRAY
5001-6776
CHASSIS, BASE
5001-6778
PANEL, REAR
5001-6779
COVER-OUTSIDE
5001-6780
INPUT SUB-CHASSIS (see 5060-3490 )
5001-6781
OUTPUT SUB-CHASSIS
5001-6782
CHASSIS-TOP (inside cover )
5001-6783
INPUT DECK
5001-6784
OUTPUT DECK
5001-6791
TRAY (control board )
5001-6792
SHIELD
5001-6793
GPIB-BRACKET (chassis top )
5020-2783
HEATSINK-DIODE
5020-2785
HEATSINK-FET
5020-2797
SHIELD-ISOLATION
5020-2808
INSULATOR
5040-1688
BUSS-BEZEL
5040-1689
BUSS BAR SUPPORT
5040-1690
BRACKET-HS
5040-1691
HS-PLEN
5040-1694
BUSS BAR, PLUS, output end (large)
5040-1696
BUSS BAR, PLUS, internal end (small)
5040-1697
BLOCK-TOP COVER
5040-1700
COLLAR-MOLDED
5040-1701
BUSS BAR BRACE
5041-880 1
FOOT
5041-8819
CAP-STRAP HANDLE
5041-8820
CAP-STRAP HANDLE
5060-3237
AC INPUT COVER ASSY.
5060-3490
AC SUB-CHASSIS ASSY.
5060-3489
NEGATIVE OUTPUT BUSS BAR ASSY.
with L902/L903 CORE
5001-6780
SUB-CHASSIS
5080-2262
3 PHASE LINE CHOKE
5080-2298
CABLE - 3 phase line choke/AC input assy
9100-5044
FAN TRANSFORMER
5060-3492
WIRE KIT (+/- sense leads)
5060-3512
400VAC/16A FUSE KIT
2110-0911
3 ea. FUSE 16AM 400VAC
5060-3513
208VAC/30A FUSE KIT
2110-0910
3 ea. FUSE 30AM 500V
5062-3705
STRAP HANDLE
5080-2038
LABEL-WARNING (no operator serviceable)
5080-2148
CABLE (chaining- 2 meters)
5080-2168
CABLE-ASSY.
5080-2277
SUL-THERMAL
5080-2280
CABLE- BIAS/CONTROL
5080-2282
CABLE - AC/RFI FILTER
5080-2285
CABLE- GPIB/FAN
92 Replaceable Parts
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Ref. Desig.
Ref. Desig.
C1
C2
C4
C5
C6,7
C8
C10-12, C14-16
C17
D1,2
L1
J2
J3
J4,5
J6
L1
R1
R2
R23-25,27-30
R37
R38
R39,40
RT1
Table 5-3. Main Chassis, Replaceable Parts (continued)
Keysight Part No.
Description
1400-0611
CABLE CLAMP (GPIB/FAN)
5080-2299
LABEL REAR PANEL
5080-2413
CRATE ( shipping container )
5080-2414
SKID ( shipping container )
5080-2415
FOAM PAD ( shipping container )
5080-2314
EDGE PROTECTOR 12 inches ( shipping container )
5080-2315
EDGE PROTECTOR 2.5 inches ( shipping container )
5080-2316
CABLE ASSY.
5960-5588
MANUAL-OPERATING
668lA#400
400V OPERATION
6681A#601
BUS BAR COVER
6681A#602
BUS BAR SPACER
5060-3514
BB SPCR KIT #602
6681A#861
CABLE-UL/CSA
8120-6203
L CORD 10AWG300V
6681A#862
CABLE-HARMONIZED
8120-6204
L CORD 2.5mm450V
6681A#908
RACK MOUNT KIT
5062-3974
RACK MTG KIT
5062-3977
RACK MOUNT KIT
6681A#909
RACK MOUNT KIT W/HANDLES
5062-3974
RACK MTG KIT
5062-3983
RACK MOUNT KIT
7120-6153
LABEL-WARNG
9135-0493
FILTER-RFI
Table 5-4. A1 Front Panel Board, Replaceable Parts
Keysight Part No.
Description
ELECTRICAL PARTS
0160-5422
0160-4808
0160-4787
0180-0155
0160-5422
0160-4835
0160-5422
0180-0155
1906-0229
9140-0158
1251-4927
1251-4926
1252-0718
1251-8184
9140-0158
1810-0560
0698-3359
0698-3155
1810-0371
0698-3441
0698-3155
0837-0412
Capacitor 0.047F 20%
Capacitor 470pF 5%
Capacitor 22pF 5% 100V
Capacitor 2.2F 20V
Capacitor 0.047F 20%
Capacitor 0.1F 10% 50V
Capacitor 0.047F 20%
Capacitor 2.2F 20V
Diode array 50V
COIL lUH 10%
Receptacle LCD display
Receptacle test header
Receptacle (A3G1, A3G2)
Receptacle phone (GPIB board)
Inductor 1H 10%
Resistor network DIP
Resistor 12.7K 1%
Resistor 4.64K l%
Resistor network SIP
Resistor 215  1% 0.125W
Resistor 4.64K 1%
Thermistor
Replaceable Parts 93
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Ref. Desig.
S1
VR16
U3
U4
U6
U8
W3
W5
Y1
Z16
Table 5-4. A1 Front Panel Board, Replaceable Parts (continued)
Keysight Part No.
Description
3101-3088
Line switch
1902-0950
Diode Zener 4.7V 5
1820-6721
IC MPU
5080-2466
ROM programmed front panel
1818-4792
IC memory
1820-2724
IC SN74ALS573BN
1258-0209
Jumper (J3)
0811-3590
Jumper
0410-2159
Crystal 10 MHz
1902-0950
Diode Zener 4.7V 5%
MECHANICAL PARTS
--------
1200-1274
1200-1417
0340-1277
0370-3238
0515-1455
0590-0534
0960-0912
5063-3408
1000-0842
5001-6794
5040-1665
5040-1687
5040-1698
5063-3473
5185-1342
5080-2261
---------
Socket IC (U3)
Socket IC (U4)
Insulator (Y1)
KNOB Ref: RPG
SCREW - Ref: keypad PCB to front frame
NUT - SELFTREAD Ref: Display board to front panel
RPG - OPTICAL ENCODER
PCA (KEYPAD)
WINDOW Ref: 3 inches front frame
BLINDER Ref: 5 inches front frame
KEYPAD
FRONT FRAME - 88.1mm ( 3.5 inches )
FRONT FRAME - 132.6mm ( 5.25 inches )
LCD DISPLAY
LABEL Ref: 3.5 inches & 5 inches front frame
CABLE Ref: Keypad PCB to LCD display
Table 5-5. Front Panel Board LED Assy, Replaceable Parts
Note: This LED Board is only used on earlier version Keysight 668xA models. Refer to Appendix A
Backdating, change 10 for more information.
Ref. Desig.
Keysight Part No.
Description
ELECTRICAL PARTS
C450
C451
D450, 451, 452, 453
R450
R451
R452
R453
R454
R455
U450
U451
Z450
0180-4132
CAP 6.8uF 35V
0160-4808
CAP 470pF 5%
1901-1098
DIO-1N4150
0698-3444
RES 316 1% .125W
0757-0401
RES 100 1% .125W
0698-3156
RES 14.7K 1%
0698-8827
RES lM 1% .125W
0698-3156
RES 14 7K 1%
0757-0280
RES lK 1% .125W
1858-0076
XSTR ARY 14P-DIP
1858-0077
XSTR ARY 14P DIP
1902-0562
DIO-ZNR 22.1V 5%
MECHANICAL PARTS
5080-2281
5080-2283
5080-2286
CABLE LINE SWITCH Ref: E456=E457 to S1
CABLE LED AC INPUT
Ref: E450-E451 to DC RAIL J440
CABLE DEW/S1 CONNECTION
Ref: E452-E455 to DC RAIL J441
94 Replaceable Parts
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Ref. Desig.
Table 5-6. A2 GPIB Board, Replaceable Parts (see Note)
Keysight Part No.
Description
ELECTRICAL PARTS
C122
C128
F101
J101
J106
J107, 108, 114, 115
P101
U110, U111
U113
U117
U118
U121
TB101
0180-4606
Capacitor 10,000F
0160-4281
Capacitor 2,200pF
2110-0699
Fuse Subminature 5AM
1252-2320
Connector Receptacle (GPIB)
1251-4926
Connector Receptacle (Test Header)
1251-7330
Connector Receptacle
1251-4245
Connector Plug 2-pin (AC Bias)
1990-0444
IC Optoisolator
1990-0543
IC Optoisolator
1820-2549
IC Optoisolator
1820-4185
IC Optoisolator
1820-0430
IC Voltage regulator
0360-2312
Terminal Block (Digital Control)
MECHANICAL PARTS
-----
1205-0758
0535-0031
0515-0642
0515-0911
Heatsink (U121)
Nut hex w/lockwasher (J101)
Screw (U121)
Screw M3x0 5 (J101)
Note: All other parts are surface mounted and are not field repairable
Ref. Desig.
C201
C202
C203
C204, 205
C206
C207, 208, 209
C210, 211, 213, 214,
C215, 216
C217
C218
C219
C220
C221
C222
C226
C227
C228
C229
C230
C231
C235, 236, 237, 238
C239
C240
C242, 243
Table 5-7. A3 FET Assembly, Replaceable Parts
Keysight Part No.
Description
ELECTRICAL PARTS
0160-7505
0180-4132
0160-4835
0160-5098
0180-4132
0160-2006
0160-6838
0160-2006
0160-5098
0160-4835
0160-2006
0180-4132
0160-5098
0180-4132
0160-4791
0160-4835
0160-2301
0160-4918
0160-4831
0160-2301
0160-4832
0160-4791
0160-4832
0160-5098
7uF+ - 5% 200V
CAP 6.8uF 35V
CAP .luF 10% 50V
CAP .22uF 10%
CAP 6.8uF 35V
CAP 100pF 10%
CAP 2200pF lKV
CAP 100pF 10%
CAP .22uF 10%
CAP .luF 10% 50V
CAP 100pF 10%
CAP 6.8uF 35V
CAP .22uF 10%
CAP 6.8uF 35V
CAP 10pF 5% 100V
CAP .luF 10% 50V
CAP 2000pF 100V
CAP .022uF 50V
CAP 4700pF 10%
CAP 2000pF 100V
CAP .0luF 10%
CAP 10pF 5% 100V
CAP .0luF 10%
CAP .22uF 10%
Replaceable Parts 95
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Ref. Desig.
C244, 245
C248
C258
C301
C302
C303
C304, 305
C306
C307, 308, 309
C310, 311, 313, 314
C315, 316
C317
C318
C319
C320
C321
C322
C326
C329
C330
C331
C335, 336, 337, 338
C339
C340
C342, 343
C344, 345
C346
D201, 202
D202
D203, 204
D205
D206, 207, 208, 209, 210
D213, 214, 215, 216, 217
D220, 221, 222, 223
D224
D301, 302
D302
D303, 304
D305
D306, 307, 308, 309, 310
D313, 314, 315, 316, 317
D320, 321, 322, 323
D324
L201, 202, 203, 204
L205, 206, 207, 208, 209
L210, 211, 212
L213, 214, 215, 216
L301, 302, 303, 304
L305, 306, 307, 308, 309
L310, 311, 312
L313, 314, 315, 316
Q201, 202, 203, 204
Q211, 222, 233, 244
Q251, 252, 253, 254
Table 5-7. A3 FET Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0160-6806
CAP .luF 400V
0160-4832
CAP .0luF 10%
0180-4132
CAP 6.8uF 35V
0160-7505
7uF+ - 5% 200V
0180-4132
CAP 6.8uF 35V
0160-4835
CAP .luF 10% 50V
0160-5098
CAP .22uF 10%
0180-4132
CAP 6.8uF 35V
0160-2006
CAP 100pF 10%
0160-6838
CAP 2200pF lKV
0160-2006
CAP 100pF 10%
0160-5098
CAP .22uF 10%
0160-4835
CAP .luF 10% 50V
0160-2006
CAP 100pF 10%
0180-4132
CAP 6.8uF 35V
0160-5098
CAP .22uF 10%
0180-4132
CAP 6.8uF 35V
0160-4791
CAP 10pF 5% 100V
0160-5098
CAP .22uF 10%
0160-4832
CAP .01uF 10%
0160-4835
CAP .luF 10% 50V
0160-4832
CAP .0luF 10%
0160-4791
CAP 10pF 5% 100V
0160-4832
CAP .01uF 10%
0160-5098
CAP .22uF 10%
0160-6806
CAP .luF 400V
0160-4800
CAP 120pF 5%
1901-0050
DIO-SWITCHING
1901-1065
DIO-lN4936 PWR
1901-0050
DIO-SWITCHING
1901-1065
DIO-lN4936 PWR
1901-0050
DIO-SWITCHING
1901-0050
DIO-SWITCHING
1901-0050
DIO-SWITCHING
1901-0731
DIO-PWR RECT
1901-0050
DIO-SWITCHING
1901-1065
DIO-lN4936 PWR
1901-0050
DIO-SWITCHING
1901-1065
DIO-lN4936 PWR
1901-0050
DIO-SWITCHING
1901-0050
DIO-SWITCHING
1901-0050
DIO-SWITCHING
1901-0731
DIO-PWR RECT
9170-1454
CORE-SHLD-BEAD
9170-1510
CORE-MAGNETIC
9170-1510
CORE-MAGNETIC
9170-1454
CORE-SHLD-BEAD
9170-1454
CORE-SHLD-BEAD
9170-1510
CORE-MAGNETIC
9170-1510
CORE-MAGNETIC
9170-1454
CORE-SHLD-BEAD
1855-0859
MOSFET 500V 20A
1855-0859
MOSFET 500V 20A
1853-0363
D45H5/D45H8/363
96 Replaceable Parts
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Ref. Desig.
Q301, 302, 303, 304
Q311, 322, 333, 344
Q351, 352, 353, 354
R201
R202
R203
R205
R206
R207
R208
R209
R210
R211, 212
R213, 214, 216, 217
R220, 221
R222
R224, 225
R226
R227
R228
R229
R230
R231
R232
R233
R237
R238
R239
R240
R241, 242
R243
R244
R245
R246
R247
R248
R249
R250
R251
R252
R253
R254
R255
R256
R257
R258
R260, 261
R262
R263, 264, 265
R266
R267
R268
R269
R270
Table 5-7. A3 FET Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
1855-0859
MOSFET 500V 20A
1855-0859
MOSFET 500V 20A
1853-0363
D45H5/D45H8/363
0811-3903
RES 150 Ohm 5W NI
0699-0208
RES 1 5% .25W CF
0683-5615
RES 560 5% .25W
0683-0625
RES 6.2 5% .25W
0683-7505
RES 75 5% .25W
0683-0335
RES 3.3 5% .25W
0683-3305
RES 33 5% .25W
0683-0625
RES 6.2 5% .25W
0683-8205
RES 82 5% .25W
0683-1535
RES 15K 5% .25W
0811-3903
RES 150 Ohm 5W NI
0811-3903
RES 150 Ohm 5W NI
0811-2556
RES 1.25 1% 4W
0811-3903
RES 150 Ohm 5W NI
0683-1535
RES 15K 5% .25W
0698-3159
RES 26.1K 1%
0683-8205
RES 82 5% .25W
0683-0625
RES 6.2 5% .25W
0683-3305
RES 33 5% .25W
0683-7505
RES 75 5% 25W
0683-0335
RES 3.3 5% 25W
0683-0625
RES 6.2 5% 25W
0757-0437
RES 4.75K 1%
0757-0280
RES lK 1% .125W
0757-0437
RES 4.75K 1%
0757-0280
RES lK 1% .125W
0757-0437
RES 4.75K 1%
0683-1535
RES 15K 5% .25W
0698-4457
RES 576 1% .125W
0683-1015
RES 100 5% .25W
0683-1555
RES 1.5M 5% .25W
0757-0462
RES 75K 1%
0698-3159
RES 26.1K 1%
0757-0444
RES 13.1K 1%
0698-3572
RES 60.4K 1%
0757-0288
RES 9.09K 1%
0698-3225
RES 1.43K 1%
0698-6533
RES 12.5K 1%
0698-3279
RES 4.99K 1%
0683-1015
RES 100 5% .25W
0698-3432
RES 26.1 1%
0698-3430
RES 21.5 1%
0683-1035
RES l0K 5% .25W
0683-8205
RES 82 5% .25W
0683-1215
RES 120 5% .25W
0683-8205
RES 82 5% .25W
0683-1215
RES 120 5% .25W
0683-8205
RES 82 5% .25W
0698-3572
RES 60.4K 1%
0698-4121
RES 11.3K 1%
0757-0440
RES 7.5K 1%
Replaceable Parts 97
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Ref. Desig.
R271
R272
R273, 274, 275
R277
R301
R302
R303
R304
R305
R306
R307
R308
R309
R310
R311
R312
R313, 314, 316, 317
R320, 321
R322
R324, 325
R326
R327
R328
R329
R330
R331
R332
R333
R337
R338
R339
R340
R341, 342
R343
R354
R355
R356, 357
R360, 361
R362
R363, 364, 365
R366
R367
R368
R369
R370
R371
R372
R373, 374, 375
R377
R378
R379
R380
R381
R382
Table 5-7. A3 FET Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0757-0200
RES 5.62K 1%
0757-0442
RES l0K 1% .125W
0757-0437
RES 4.75K 1%
0698-3633
RES 3905% 2W MO
0811-3903
RES 150Ohm 5W NI
0699-0208
RES 1 5% .25W CF
0683-5615
RES 5605% .25W
0698-4435
RES 2.49K 1%
0683-0625
RES6.25% .25W
0683-7505
RES 75 5% .25W
0683-0335
RES 3.3 5% .25W
0683-3305
RES 33 5% .25W
0683-0625
RES 6.2 5% .25W
0683-8205
RES 82 5% .25W
0683-1535
RES 15K 5% .25W
0683-1535
RES 15K 5% .25W
0811-3903
RES 150 Ohm 5W NI
0811-3903
RES 150 Ohm 5W NI
0811-2556
RES 1.25 1% 4W
0811-3903
RES 150 Ohm 5W NI
0683-1535
RES 15K 5% .25W
0683-1555
RES 1.5M 5% .25W
0683-8205
RES 82 5% .25W
0683-0625
RES 6.2 5% .25W
0683-3305
RES 33 5% .25W
0683-7505
RES 75 5% .25W
0683-0335
RES 3.3 5% .25W
0683-0625
RES 6.2 5% .25W
0757-0437
RES 4.75K 1%
C757-0280
RES lK 1% .125W
0757-0437
RES 4.75K 1%
0757-0280
RES lK 1% .125W
0757-0437
RES 4.75K 1%
0683-1535
RES 15K 5% .25W
0757-0442
RES 10K 1% .125W
0698-3136
RES 17.8K 1%
0757-0382
RES 16.21%
0683-8205
RES 82 5% .25W
0683-1215
RES 120 5% .25W
0683-8205
RES 82 5% .25W
0683-1215
RES 120 5% .25W
0683-8205
RES 82 5% .25W
0698-3572
RES 60.4K 1%
0698-4121
RES 11.3K 1%
0757-0440
RES 7.5K 1%
0757-0200
RES 5.62K 1%
0757-0442
RES 10K 1% .125W
0757-0437
RES 4.75K 1%
0698-3633
RES 390 5% 2W MO
0757-0274
RES 1.21K 1%
0683-1005
RES 10 5% .25W
0757-0437
RES 4.75K 1%
0698-0085
RES 2.61K 1%
0683-1015
RES 100 5% .25W
98 Replaceable Parts
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Ref. Desig.
R383
R384, 385
T202
T204
T205
T302
T304
U201, 202
U203
U204
U205
U301, 302
U303
U304
U305
Z201, 301
Table 5-7. A3 FET Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0757-0442
RES 10K 1% .125W
8159-0005
RES-ZERO OHMS
9100-4350
XFMR-CURRENT
06624-80091
XFMR-PULSE
5080-2238
XFMR-CUR SHARING
9100-4350
XFMR-CURRENT
06624-80091
XFMR-PULSE
1820-8433
PWM I.C. IR2110
1826-1343
IC-VOLTAGE REG TL431CP
1826-0138
IC COMPARATOR LM339N
1826-1475
VOLTAGE COMPTR LT101lCN8
1820-8433
PWM I.C. IR2110
1826-1343
IC-VOLTAGE REG TL431CP
1826-0412
IC LM393N
1990-0996
OPTO-ISOLATOR HCPL-2200
1902-1377
DIO-ZNR 6 19V
MECHANICAL PARTS
5080-2279
5080-2283
5080-2291
5080-2295
Ref. Desig.
C420
C428, 429, 430
J417, 418
J419
J420
K401
K402
R400 - 405
R407, 408
R435, 436, 437
CABLE FET CONTROL
Ref: E208-E209 to CONTROL J511
CABLE +15V BIAS
Ref: E206-E207 to BIAS J831
Ref: E306-E307 to BIAS J830
CABLE FET RAIL A
Ref: E201-E202 to DCRAIL J430
CABLE FET RAIL B
Ref: E301-E302 to DCRAIL J431
Table 5-8. A4 AC Input Assembly, Replaceable Parts
Keysight Part No.
Description
ELECTRICAL PARTS
0160-7606
0160-7898
1251-5422
1251-6832
1251-3819
0490-1908
5060-3593
CAP 1uF 275V
CAP 0.01uF 440V
CONNECTOR
CONNECTOR
CONNECTOR
RELAY 24V COIL
CONTACTOR, 3 POLE
Not Used
0699-3191
RES 27 OHM 5% 20W
0698-3609
RES 22 OHM 5% 2W
MECHANICAL PARTS
5060-3493
5080-2284
WIRE KIT (E403-E408 to Fl,F2,F3)
CABLE RELAY CNTRL (E411-E413 to BIAS J827)
Replaceable Parts 99
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Ref. Desig.
C418
C420, 421, 422
C427
D420, 421, 422, 424, 425
DS420, 421
F420
F420
F421
F421
J430, 431
J432
J433
J436, 437, 438, 439
J440
J441
L420, 421
R420, 421, 422
R423, 424, 425,426,427,428
R429, 430, 431,432,433,434
Table 5-9. A5 DC Rail Assembly, Replaceable Parts
Keysight Part No.
Description
ELECTRICAL PARTS
0160-4048
CAP 0.022uF 20%
0160-7606
CAP luF 275V
0160-7743
C-F .047uF 380V
5060-3516
ASSY.-RECTIFIER
1990-0517
LED
2110-1107
FUSE CLIPS
2110-0934
FUSE .5AM, 500V
2110-1107
FUSE CLIPS
2110-0934
FUSE .5AM, 500V
1251-7616
CONNECTOR
1251-6832
CONNECTOR
1251-3819
CONNECTOR
1251-3837
CONNECTOR
1252-0055
CONNECTOR
1252-0056
CONNECTOR
5080-2300
INDUCTOR-NM
0698-3611
RES 27 5% 2W MO
0764-0044
RES 8.2K 5% 2W
0764-0044
RES 8.2K 5% 2W
MECHANICAL PARTS
5080-2286
5080-2288
5080-2289
5080-2293
5080-2294
Ref. Desig.
C800
C801
C803
C804
C805
C806
C807
C808
C809, 810
C811, 812
C813
C814, 815
C8 16, 817
C818, 819
C820, 821, 822
CABLE BIAS 24V SECONDARY
Ref: E440-E443 to BIAS J816
CABLE AC POWER
Ref: E420-E425 to ACINPUT J420
CABLE AC BIAS
Ref: E430-E434 to ACINPUT J419
CABLE BIAS LINE SELECT
Ref: E444-E447 to J436/J437
CABLE RAIL LINE SELECT
Ref: E448-451 to J438/J439
Table 5-10. A6 Bias Assembly, Replaceable Parts
Keysight Part No.
Description
ELECTRICAL PARTS
0160-4834
0180-4140
0160-5422
0180-4131
0160-7743
0160-4834
0180-3587
0180-0230
0180-4129
0160-4834
0180-2980
0180-4129
0180-4405
0180-0230
0180-4129
CAP .047uF 10%
CAP 1800 uF 63V
CAP .047uF 20%
CAP 4.7uF 35V
C-F .047uF 380V
CAP .047uF 10%
CAP 1000uF 50V
C-F luF 50V
CAP luF 35V
CAP .047uF 10%
C-F 1000uF 50V
CAP luF 35V
CAP 470 uF 50V
C-F luF 50V
CAP luF 35V
100 Replaceable Parts
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Table 5-10. A6 Bias Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
C823
0180-4131
CAP 4.7uF 35V
C824, 825
0180-3298
C-F 2200uF 50V
C826
0160-4834
CAP .047uF 10%
C827
0180-3587
CAP 1000uF 50V
C828
0180-0230
C-F luF 50V
C829, 830, 831
0180-4129
CAP luF 35V
C841
0180-4397
C-F 100uF 63V
C842
0180-4131
CAP 4.7uF 35V
C843, 844, 845
0160-4835
CAP .luF 10% 50V
C846
0180-4131
CAP 4.7uF 35V
C847
0180-0228
C-F 22uF 15V
D800, 801, 802,803,804,805
1901-0731
DIO-PWR RECT
D806, 807, 808,809,810,811
1901-0731
DIO-PWR RECT
D812, 813, 814,815,816,817
1901-0731
DIO-PWR RECT
D818, 819
1901-0731
DIO-PWR RECT
D820
1902-0018
DIO-ZNR lN941
D830
Not Used
D832
1902-3393
DIO-ZNR 75V 55'o
F800
2110-0712
FU-SUBMIN 4A
F803, 804, 805, 806
2110-0679
FUSE 1.5AM, 125V
J801
1252-1670
CONNECTOR
J809
1252-8837
CONNECTOR
J816
1252-0056
CONNECTOR
J821
1252-5230
CONNECTOR
J827
1251-7070
CONNECTOR
J830, 831
1252-0055
CONNECTOR
Q818, 819
5060-3245
HEAT SINK-TRANSISTOR (1854-0828) ASSY.
Q820, 821, 822
5060-3527
HEAT SINK-TRANSISTOR (1854-0828) ASSY.
R800
0683-3025
RES 3K 5% .25W
R801, 802
0683-0475
RES 4.7 5% .25W
R803
0698-0084
RES 2.15K 1%
R804
0698-3440
RES 196 1% .125W
R805, 806
8159-0005
RES-ZERO OHMS
R807, 808, 809
0698-0084
RES 2.15K 1%
R810
0698-3440
RES 196 1% .125W
R811
0699-0208
RES 1 5% .25W CF
R812, 813, 814, 815, 816
8159-0005
RES-ZERO OHMS
R817
0757-0442
RES 10K 1% .125W
R818
0698-6392
RES 22K .1%.125W
R819
0698-6631
RES 2.5K .1%
R820
0699-0070
RES 3.16M 1%
R821
0698-4493
RES 34K 1% .125W
R822
0757-0290
RES 6.19K 1%
R823
0757-0283
RES 2K 1% .125W
R824
0699-0070
RES 3.16M 1%
R825
0757-0444
RES 12.1K 1%
R827
0757-0274
RES 1.21K 1%
R828
0757-0444
RES 12.1K 1%
R830
8159-0005
RES-ZERO OHMS
R831
0757-0290
RES 6.19K 1%
R833
0757-0280
RES lK 1% .125W
R834
0757-0442
RES 10K 1% .125W
R835
0698-0085
RES 2.61K 1%
R836
0757-0442
RES 10K 1% .125W
Ref. Desig.
Replaceable Parts 101
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Ref. Desig.
R841
R842
R843
R844
R845, 847
R848
R849
R850
R851
R852
R853, 854, 855
R856
R857
R858, 859, 860
R861
R862
R863
R864
R865
R867
R868
R869
R870
R871
R872
R873
R874
R875
R876, 877, 878
R879, 880
T801
T802
U801
U802
U803
U804
U805
U806
U807
U808
U809, 810, 811
U812
U813
Table 5-10. A6 Bias Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0698-6363
RES 40K .1%
0698-6360
RES 10K .1%
0757-0472
RES 200K 1%
0698-6977
RES 30K .1% .125
0698-6360
RES 10K .1%
0698-6977
RES 30K .1% .125
0683-3325
RES 3.3K 5% .25W
0698-6977
RES 30K .1% .125
0698-4037
RES 46.4 1%
0683-3325
RES 3.3K 5% .25W
0683-1005
RES 10 5% .25W
0698-3152
RES 3.48K 1%
0698-4037
RES 46.4 1%
0683-1005
RES 10 5% .25W
0698-8234
RES 12.1K 1%
0699-0070
RES 3.16M 1%
0757-0469
RES 150K 1%
0699-0070
RES 3.16M 1%
0757-0464
RES 90.9K 1%
0757-0290
RES 6.19K 1%
0757-0199
RES 21.5K 1%
0757-0281
RES 2.74K 1%
8159-0005
RES-ZERO OHMS
0698-3440
RES 196 1% .125W
0698-0084
RES 2.15K 1%
8159-0005
RES-ZERO OHMS
0757-0274
RES 1.21K 1%
0698-4037
RES 46.4 1%
0683-1005
RES 10 5% .25W
8159-0005
RES-ZERO OHMS
9100-5040
XFMR- GPIB
9100-5041
XFMR-BIAS
5060-2942
HEAT SINK-LM317T REGULATOR ASSY.
5060-2948
HEAT SINK-UA7805UC REGULATOR ASSY.
5060-2942
HEAT SINK-LM317T REGULATOR ASSY.
5060-2943
HEAT SINK-LM337T REGULATOR ASSY.
5060-2942
HEAT SINK-LM317T REGULATOR ASSY.
1826-0544
IC-V RGLTR 2.5V MC1403U
1826-0138
IC COMPARATOR LM339N
1858-0047
XSTR ARY 16P-DIP
1990-1074
OPTO-ISOLATOR 4N35
1826-0161
IC LM324N
1990-1074
OPTO-ISOLATOR 4N35
MECHANICAL PARTS
5080-2292
CABLE PRIMARY BIAS
Ref: E800-E804 to DCRAIL J432
102 Replaceable Parts
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Ref. Desig.
C910, 911, 912, 913
6680A, 6681A
6682A
6683A
6684A
R910, 911, 912, 913
6680A, 6681A
6682A
6683A
6684A
R914, 915, 916, 917, 918
6680A, 6681A
6682A
6683A
6684A
R919, 920, 921
6680A, 6681A
6682A
6683A
6684A
Table 5-11. A7 Snubber Assembly, Replaceable Parts
Keysight Part No.
Description
ELECTRICAL PARTS
0160-0162
0160-6896
0160-4845
0160-6162
CAP .022uF 10%
CAP .015uF 10%
CAP 6800pF 10%
CAP 4700pF 10%
0698-3601
0698-3611
0764-0013
0698-3614
RES 10 5% 2W MO
RES 27 5% 2W MO
RES 56 5% 2W MO
RES 43 5% 2W MO
not used
0698-3611
0764-0013
0698-3614
RES 27 5% 2W MO
RES 56 5% 2W MO
RES 43 5% 2W MO
not used
0698-3611
RES 27 5% 2W MO
0764-0013
RES 56 5% 2W MO
0698-3614
RES 43 5% 2W MO
MECHANICAL PARTS
6680A, 6681A
5060-3327
6682A, 6683A, 6684A
5060-3365
Ref. Desig.
Table 5-12. A7 Fast Sense Assembly, Replaceable Parts
Keysight Part No.
Description
ELECTRICAL PARTS
06680-60023
06681-60023
06682-60023
06683-60023
06684-60023
Cl000
WIRE KIT ( 2 required )
Ref: D900,D901,D902,D903
WIRE KIT
Ref: D900A,B,D90lA,B
0160-5468
FAST SENSE PC ASSEMBLY
Ref:6680A POWER SUPPLY
FAST SENSE PC ASSEMBLY
Ref:6681A POWER SUPPLY
FAST SENSE PC ASSEMBLY
Ref:6682A POWER SUPPLY
FAST SENSE PC ASSEMBLY
Ref:6683A POWER SUPPLY
Ref:6681A POWER SUPPLY
FAST SENSE PC ASSEMBLY
Ref:6684A POWER SUPPLY
CAP 0.47uF 50V
MECHANICAL PARTS
5080-2287
CABLE Ref: El001-El003 to CONTROL J512
Replaceable Parts 103
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Ref. Desig.
Table 5-13. A9 Down Programmer/Slow Sense, Replaceable Parts
Keysight Part No.
Description
ELECTRICAL PARTS
C950, 951
C952, 953
C956, 957
C958, 980
D980, 981
F980, 981
6680A, 6681A
6682A, 6683A, 6684A
Q980
R940
6680A, 6681A
6682A, 6683A
6684A
R94l
6680A, 6681A
6682A
6683A, 6684A
R945, 946
6680A
6681A
6682A
6683A
6684A
R950, 951, 952, 953
R954, 955, 958, 959
R960
R961
R980
R981
R982
R983, 984
U900
6680A 6681A
6682A, 6683A, 6684A
Z900, 901
Q981, 982*
6680A, 6681A
6682A, 6683A, 6684
0160-4259
0160-4048
0160-4065
0160-4835
1901-1098
CAP .22uF 10%
CAP .022uF 20%
CAP .luF 20%
CAP .luF 10% 50V
DIO-IN4150
2110-0697
2110-0916
1853-0510
FU-SUBMIN 15A
FU-SUBMIN 7A
XSTR PNP
0811-3705
0811-3691
0699-1060
RES .01 3W
RES .025 3W
RES .05 3W
0811-3705
0811-3691
0699-1060
RES .01 3W
RES .025 3W
RES .05 3W
0698-3609
0698-3614
0698-3633
0698-3637
0698-3338
0683-5605
0699-0208
0683-2755
not used
0757-0451
0698-4416
0757-0273
0698-0082
RES 22 5% 2W MO
RES 43 5% 2W MO
RES 390 5% 2W MO
RES 820 5% 2W MO
RES 1.5K 5% 2W MO
RES 56 5% .25W
RES l 5% .25W CF
RES 2.7M 5% .25W
1826-0890
1826-1409
1902-0960
IC 358A
LT1013
DIO ZNR 12V 5%
RES 24.3K 1%
RES 169 1% .125W
RES 3.01K 1%
RES 464 1% .125W
1855-0874
POWER MOSFET
1855-1003
POWER MODFET
0340-1507
INSULATOR (REF Q981,982)
5080-2316*
CABLE Ref: J910 to A10 CONTROL J510
* not supplied as part of downprogrammer assy
104 Replaceable Parts
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Ref. Desig.
C500, 501, 502
C503
C504
C505
C506
C507
C508
C509, 510
C511
C512
C513
C514, 515
C516
C517
C518, 519
C520
C521
C530, 531, 532
C533, 534, 534
C536, 537, 538
C539
C540, 541, 542, 543
C544
C545, 546
C547
C548
6680A, 6681A
C556, 560
C561
C562
C563, 564
C565
C566
C567
C568, 569
C570
C571
C572
C573
C574
C575, 576
C577, 578
C579, 580
C581
C583
C584
C585
C586
C587
6680A
6681A
6682A, 683A, 6684A
Table 5-14. A10 Control Assembly, Replaceable Parts
Keysight Part No.
Description
ELECTRICAL PARTS
0180-4129
0160-4835
0180-4129
0180-4131
0160-4835
0180-4136
0160-4831
0180-4129
0160-5422
0160-5644
0160-4789
0160-4805
0160-5422
0180-4129
0160-4835
0160-4822
0160-4832
0160-5422
0160-4801
0160-5422
0160-4846
0160-5469
0160-4835
0160-4801
0180-2264
CAP luF 35V
CAP .luF 10% 50V
CAP luF 35V
CAP 4.7uF 35V
CAP .luF 10% 50V
CAP l0uF 20V
CAP 4700pF 10%
CAP luF 35V
CAP .047uF 20%
CAP .033uF 10%
CAP 15pF 5% l00V
CAP 47pF 5% l00V
CAP .047uF 20%
CAP luF 35V
CAP luF 10% 50V
CAP l000pF 5%
CAP .0luF 10%
CAP .047uF 20%
CAP l00pF 5%
CAP .047uF 20%
CAP 1500pF l00V
C-F luF 10% 50V
CAP .luF 10% 50V
CAP l00pF 5%
C-F 3.3uF 15V
0160-4855
0160-4835
0160-4904
0160-4791
0160-4835
0160-4791
0160-4795
0160-4904
0160-4787
0160-4795
0180-4129
0180-4131
0160-4835
0160-4805
0160-5098
0160-4824
0160-4835
0160-4797
0160-4807
0160-4797
0160-4834
0160-4835
CAP 0.1uF 50V
CAP .luF 10% 50V
CAP 6800pF 5%
CAP l0pF 5% l00V
CAP .luF 10% 50V
CAP l0pF 5% 100V
CAP 4.7pF
CAP 6800pF 5%
C-F 22pF 5% l00V
CAP 4.7pF
CAP luF 35V
CAP 4.7uF 35V
CAP .luF 10% 50V
CAP 47pF 5% l00V
CAP .22uF 10%
CAP 680pF l00v
CAP .luF 10% 50V
CAP 3.3pF
CAP 33pF 5% l00V
CAP 3.3pF
CAP .047uF 10%
CAP .luF 10% 50V
0160-4814
0160-4801
0160-4813
CAP 150pF 5%
CAP l00pF 5%
CAP 180pF 5%
Replaceable Parts 105
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Ref. Desig.
Table 5-14. A10 Control Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0160-4799
CAP 2.2pF 5%
C588
C589, 590
6680A, 6681A
6682A, 6683A, 6684A
C591
6680A
6681A
6682A, 683A, 6684A
C592
C594
C595
C596
6680A, 6681A
6682A, 683A, 6684A
C597
C598
6680A, 6681A
6682A, 6683A
6684A
C599, 600, 601
C621
C622
C624
6680A
6681A
6682A
6683A, 6684A
C625
6680A
6681A
6682A
6683A
6684A
C626, 627
C628
C629
C630
6680A
6681A
6682A
6683A, 6684A
C631
6680A
6681A
6682A, 6683A, 6684A
C632, 633
C635, 636
6680A
6681A
6682A
6683A, 6684A
C637
6680A, 6681A
6682A, 6683A, 6684A
not used
0160-4824
CAP 680pF 5%
0160-4814
0160-4801
0160-4813
0160-4835
0160-4799
0160-5098
CAP 150pF 5%
CAP l00pF 5%
CAP 180pF 5%
CAP .luF 10% 50V
CAP 2.2pF
CAP .22uF 10%
0160-4811
0160-4831
0160-4795
CAP 270pF 5%
CAP 4700pF 5%
CAP 4.7pF
0160-4831
0160-4830
0160-4831
0160-4835
0160-4795
0160-5534
CAP 4700pF 10%
CAP 2200pF 10%
CAP 4700pF 10%
CAP .luF 10% 50V
CAP 4.7pF
CAP 0.luF 10% 63V
0160-5267
0160-5410
0160-4904
0160-5267
CAP 4700pF 5%
CAP 3300pF 5%
CAP 6800pF 5%
CAP 4700pF 5%
0160-4819
0160-4846
0160-4821
0160-4824
0160-4808
0180-4136
0160-4835
0160-4799
CAP 2200pF l00V
CAP 1500pF l00V
CAP 1200pF l00V
CAP 680pF l0V
CAP 470pF l0V
CAP l0uF 20V
CAP .luF 10% 50V
CAP 2.2pF
0160-4904
0160-5410
0160-4812
0160-4810
CAP 6800pF 5%
CAP 3300pF 5%
CAP 220pF 5%
CAP 330pF 5%
0160-5534
0160-5892
0160-5469
0160-4791
CAP 0.luF 10%
CAP 0.22uF 10%
CAP luF 10%
CAP l0pF 5% l00V
0160-5468
0160-5469
0160-5892
0160-5468
CAP 0.47uF 10% 50V
CAP luF 10% 50V
CAP 0.22uF 10% 50V
CAP 0.47uF 10% 50V
0160-4808
0160-4812
CAP 470pF 5%
CAP 220pF 5%
106 Replaceable Parts
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Ref. Desig.
Table 5-14. A10 Control Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0160-4795
CAP 4.7pF
0160-4835
CAP .luF 10% 50V
0160-5410
CAP 3300pF 5%
0160-4805
CAP 47pF 5% l00V
0160-4831
CAP 4700pF 10%
0160-4833
CAP .022uF 10%
0160-7277
CAP 2.2uF 50V
0160-4832
CAP .0luF 10%
0160-5892
CAP 0.22uF 10%
0160-4183
CAP l000pF 20%
C639
C640
C641
C645
C648
C650
C651
C652
C653
C654, 655
C656
6680A, 6681A
6682A, 6683A, 6684A
C657
6680A, 6681A
6682A, 6683A, 6684A
C658, 659
C710, 711
C715
6680A, 6681A
6682A, 6683A, 6684A
C735
D500, 501, 502
D503, 504, 505,506,507,508
D530, 531, 532,533,534,535
D536, 538
D539
D540
D560, 561
D637
D651, 652
D653, 654
D655, 656
D657
D658, 659
D670
D671
D672, 673, 674, 675, 676
D677, 678, 679, 680
J507
J509
J510
J511
J512
J513
L500
Q610
Q621, 622, 623
R500
R501, 502
R503
R504
R505
0160-5892
0160-5469
CAP 0.22uF 10%
CAP luF 10% 50V
not used
0160-5534
0160-4183
0160-4835
CAP 0.luF 10%
CAP l000pF 20%
CAP .luF 10% 50V
not used
0160-4824
0683-1005
1901-0731
1901-1098
1901-1098
1901-1098
1901-0880
1901-1098
1901-0880
1901-1098
1901-1098
1901-0880
1901-1098
1901-0880
1901-1098
1901-0880
1901-1098
1901-0880
1901-1098
1251-7330
1252-1992
1252-1152
1252-0055
1252-0056
1252-3693
9140-0158
1853-0510
1855-0413
0757-0346
0698-3155
0757-0273
0757-0442
0757-0434
CAP 680pF 5%
RES 10 5% .25W
DIO-PWR RECT
DIO-1N4150
DIO-1N4150
DIO-1N4150
DIO GEN PRP
DIO-1N4150
DIO GEN PRP
DIO-1N4150
DIO-1N4150
DIO GEN PRP
DIO-1N4150
DIO GEN PRP
DIO-IN4150
DIO GEN PRP
DIO-IN4150
DIO GEN PRP
DIO-1N4150
PHONE RECEPTABLE
CONNECTOR 16 pin
CONNECTOR 10 pin
CONNECTOR 2 pin
CONNECTOR 4 pin
CONNECTOR 7 pin
COIL lUH 10%
XSTR PNP
J-FET P-CHAN
RES 10 1% .125W
RES 4.64K 1%
RES 3.01K 1%
RES 10K 1% .125W
RES 3.65K 1%
Replaceable Parts 107
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Ref. Desig.
R506
R507
R508
R509
R510
R511
R512
R513
R514
R515
R516
R517
R518
R519
R520
R521
R522
R523, 524
R525, 526
R527
R528
R529
R530
R531
R532
R533
R534
R535
R536
6680A
6681A
6682A
6683A
6684A
R537
6680A
6681A
6682A, 6683A
6684A
R538
6680A, 6681A
6682A
6683A
R539
R540
R550, 551, 552
R553, 554
R555
R556
R557
R558, 559
R560, 561, 562, 563
R564, 565, 566, 567
R568, 569
Table 5-14. A10 Control Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0757-0289
RES 13.3K 1%
0698-3155
RES 4.64K 1%
0698-6323
RES 100.1%
0757-0442
RES 10K 1% .125W
0757-0289
RES 13.3K 1%
0698-3155
RES 4.64K 1%
0757-0472
RES 200K 1%
0757-0199
RES 21.5K 1%
0698-3279
RES 4.99K 1%
0757-0472
RES 200K 1%
0698-3456
RES 287K 1%
0698-3279
RES 4.99K 1%
0757-0442
RES 10K 1% .125W
0698-3279
RES 4.99K 1%
0757-0442
RES 10K 1% .125W
0757-0465
RES 100K 1%
0757-0289
RES 13.3K 1%
0757-0280
RES lK 1% .125W
0757-0442
RES 10K 1% .125W
0699-1212
RES l9K .1%
0698-6392
RES 22K .1%.125W
0757-0283
RES 2K 1% .125W
1810-0305
NETWORK-RES SIP
0698-4446
RES 267 1% .125W
0757-0273
RES 3.01K 1%
0698-3155
RES 4.64K 1%
0699-0070
RES 3.16M 1%
0757-0468
RES 130K 1%
0757-0290
0757-0442
0698-4486
0698-6076
0757-0457
RES 6.19K 1% .125W
RES 10K 1% .125W
RES 24.9K 1%
RES 39K 1%
RES 47.5K 1%
8159-0005
0698-8827
0699-0070
not used
RES 0.0
RES lM 1%
RES 3.16M 1%
0698-8827
0699-1972
0699-0070
0757-0438
0757-0428
0757-0401
0757-0465
0757-0462
0698-3450
0757-0280
0698-3456
0698-4486
0699-0642
0698-3279
RES lM 1%
RES 1.74M 1%
RES 3.16K
RES 5.11K 1%
RES 1.62K 1%
RES 100 1% .125W
RES 100K 1%
RES 75K 1% .125W
RES 42.2K 1%
RES lK 1% .125W
RES 287K 1%
RES 24.9K 1%
RES 10K .1% .lW
RES 4.99K 1%
108 Replaceable Parts
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Ref. Desig.
R570, 580
R581
R582, 583
R584
R585
R586
R587
R588, 589
R590
R591, 592
R593
R594
R595
R596
R597
R598
R599, 600
R601, 602
R603
R604
R605, 606
R607
R608, 609
R610
6680A
6681A, 6682A
6683A, 6684A
R611
R612
R613
R614
R615
R616
R617
R618
R619
R620
6680A, 6681A
6682A
6683A, 6684A
R621
6680A, 6681A
6682A
6683A
6684A
R622
6680A, 6681A
6682A
6683A, 6684A
R623
6680A, 6681A
6682A
6683A
6684A
Table 5-14. A10 Control Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0757-0424
RES l.lK 1%
0757-0407
RES 200 1% .125W
0698-4486
RES 24.9K 1%
0757-0472
RES 200K 1%
0757-0434
RES 3.65K 1%
0757-0472
RES 200K 1%
0757-0407
RES 200 1% .125W
0757-0442
RES 10K 1% .125W
0699-0070
RES 3.16M 1%
0757-0472
RES 200K 1%
0699-0070
RES 3.16M 1%
0757-0280
RES lK 1% .125W
0757-0273
RES 3.01K 1%
0757-0442
RES 10K 1% .125W
0757-0199
RES 21.5K 1%
0757-0273
RES 3.01K 1%
0757-0427
RES 1.5K 1%
0757-0401
RES 100 1% .125W
0698-4446
RES 267 1% .125W
0698-3279
RES 4.99K 1%
0698-3430
RES 21.5 1%
0698-4479
RES 14K 1% .125W
0757-0429
RES 1.82K 1%
0757-0462
0757-0465
0757-0465
0698-3450
0757-0442
0698-3155
0698-3279
0698-3162
0757-0410
0698-0082
0757-0410
0757-0453
RES 75K 1%
RES l00K 1%
RES l00K 1%
RES 42.2K 1%
RES l0K 1% .125W
RES 4.64K 1%
RES 4.99K 1%
RES 46.4K 1%
RES 301 1% .125W
RES 464 1% .125W
RES 301 1% .125W
RES 30.1K 1%
not used
0698-3136
0757-0446
RES 17.8K 1%
RES 15K 1%
0757-0453
0757-0462
0757-0467
0757-0469
RES 30.1K 1%
RES 75K 1%
RES 121K 1%
RES 150K 1%
not used
0698-3136
0757-0446
RES 17.8K 1%
RES 15K 1%
0757-0453
0757-0462
0757-0467
0757-0469
RES 30.1K 1%
RES 75K 1%
RES 121K 1%
RES 150K 1%
Replaceable Parts 109
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Ref. Desig.
Table 5-14. A10 Control Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0757-0453
RES 30.1K 1%
R624
R625
6680A, 6681A
6682A
6683A, 6684A
R626
6680A, 6681A
6682A
6683A, 6684A
R627, 628
R629
R632
R633
R634
R635
R636
R637
6680A, 6681A, 6682A
6683A
6684A
R638
R639
6680A, 6681A
6682A
6683A
6684A
R640
R641
6680A, 6681A
6682A, 6683A, 6684A
R642
R643
R644
R645
6680A
6681A, 6682A
6683A, 6684A
R646
6680A, 6681A
6682A, 6683A, 6684A
R658, 659
R660
R661
6680A
6681A
6682A
6683A, 6684A
R662
R663
R664
R665
0698-3455
0757-0461
0699-1972
RES 261K 1%
RES 68.1K 1%
RES 1.74M 1%
0698-3455
0699-0088
0757-0480
0698-3455
0698-4479
0757-0273
0757-0465
0757-0442
0698-3450
0757-0280
RES 261K 1%
RES 1.21M 1%
RES 432K 1%
RES 261K 1%
RES 14K 1% .125W
RES 3.01K 1%
RES 100K 1%
RES 10K 1% .125W
RES 42.2K 1%
RES lK 1% .125W
0757-0465
0757-0466
0757-0464
0698-3279
RES 100K 1%
RES 110K 1%
RES 90.0K 1%
RES 4.99K 1%
0757-0463
0757-0464
0757-0466
0757-0464
0698-3279
RES 82.5K 1%
RES 90.9K 1%
RES 110K 1%
RES 90.9K 1%
RES 4.99K 1%
0757-0452
0698-3156
0757-0410
0757-0429
0757-0434
RES 27.4K 1%
RES 14.7K 1%
RES 301 1%
RES 1.82K 1%
RES 3.65K 1%
0698-8827
0699-0070
0699-0070
RES lM 1%
RES 3.16M 1%
RES 3.16M l%
0699-0088
0698-3215
0757-0278
0698-8827
RES 1.2M 1%
RES 499K 1%
RES 1.78K 1%
RES lM 1% .125W
0757-0433
0757-0430
0757-0427
0757-0280
0757-0273
0698-3456
0698-3155
0757-0273
RES 3.32K 1%
RES 2.21K 1%
RES 1.5K 1%
RES lK 1%
RES 3.01K 1%
RES 287K 1%
RES 4.64K 1%
RES 3.01K 1%
110 Replaceable Parts
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Ref. Desig.
R666
6680A
6681A, 6682A
6683A
6684A
R667
6680A
6681A
6682A, 6683A
6684A
R668
R669
6680A
6681A
6682A
6683A
6684A
R670
6680A
6681A, 6682A
6683A, 6684A
R671
R672
6680A
6681A, 6682A
6683A, 6684A
R673
R674
R675
R677
R678, 679
6680A
6681A, 6682A
6683A, 6684A
R680
6680A, 6681A
6682A
6683A
6684A
R681
6680A, 6681A
6682A
6683A
6684A
R682
6680A
6681A
6682A
6683A, 6684A
R683
6680A
6681A
6682A
6683A, 6684A
Table 5-14. A10 Control Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
0698-8913
0683-2255
0683-4755
0683-5655
RES 1.5M 1%
RES 2.2M 1%
RES 4.7M 1%
RES 5.6M 1%
0757-0465
0757-0462
0698-3455
0757-0473
0698-3279
RES l00K 1
RES 75K 1%
RES 261K 1%
RES 221K 1%
RES 4.99K 1
0757-0462
0698-4503
0757-0273
0757-0480
0698-3456
RES 75K 1%
RES 66.5K 1%
RES 3.01K 1%
RES 432K 1%
RES 287K 1%
0699-1742
0699-1211
0699-0460
0699-0070
RES 70K 1%
RES 95K 1%
RES 85K 1%
RES 3.16M 1%
0698-8093
0699-0118
0699-0461
0699-2247
0699-0461
0698-3279
0699-0461
RES 40K 1%
RES 20K 1%
RES 30K .1%
RES 121K .05%
RES 30K .1% .lW
RES 4.99K 1%
RES 30K .1% .lW
0699-3414
0699-2246
0699-2246
RES 45K
RES 25K 0.05%
RES 25K 0.05%
0699-3103
0699-2248
0699-2879
0699-3416
RES l9K 0.05%
RES 47.5K 0.05%
RES 80K 0.05%
RES l00K 0.05%
0699-3103
0699-2248
0699-2879
0699-3416
RES l9K 0.05%
RES 47.5K 0.05%
RES 80K 0.05%
RES l00K 0.05%
0698-6322
0698-7163
0698-8061
0698-6322
RES 4K 0.1%
RES 2.0081K 0.1%
RES 8.25K 0.1%
RES 4K 0.1%
0698-6322
0698-7163
0698-8061
0698-6322
RES 4K 0.1%
RES 2.0081K 0.1%
RES 8.25K 0.1%
RES 4K 0.1%
Replaceable Parts 111
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Ref. Desig.
Table 5-14. A10 Control Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
R684
6680A
6681A
6682A
6683A
6684A
R685
6680A
6681A
6682A
. 6683A
6684A
R686
6680A
6682A
6683A
6684A
R687
R689
R690
6680A, 6681A
6682A, 6683A
6684A
R691
6680A, 6681A
6682A
6683A
6684A
R692
R693, 694
R695
R696, 697
R698, 699
R701, 702
R703
6680A
6681A, 6682A
6683A, 6684A
R704
R705
6680A
6681A, 6682A
6683A, 6684A
R706
R707
6680A
6681A, 6682A
6683A, 6684A
R708
6680A
6681A, 6682A
6683A, 6684A
0757-0280
0757-0289
0757-0430
0698-3496
0757-0436
RES lK 1%
RES lK 1%
RES 2.21K 1%
RES 3.57K 1%
RES 4.32K 1%
0757-0280
0757-0289
0757-0430
0698-3496
0757-0436
RES lK 1%
RES lK 1%
RES 2.21K 1%
RES 3.57K 1%
RES 4.32K 1%
8159-0005
0698-8911
0699-0486
8159-0005
0698-8093
0698-5365
RES 0.0
RES 1.3K .1%
RES 2.0K .1%
RES 0.0
RES 40K .1% .lW
RES 3.48K .1%
0757-0395
0757-0403
0698-6362
RES 56.2
RES 121
RES 1.0K .1%
0699-1011
0698-8911
0698-7163
0698-8911
0698-6620
0698-3430
0698-8093
0698-6414
0698-6323
0757-0442
RES 3.32K .1%
RES 1.3K .1%
RES 2.0081K .1%
RES 1.3K .1%
RES 150K .1%
RES 21.5 1%
RES 40K .1% .lW
RES lK .1% .lW F
RES 100 1%
RES 10K 1% .125W
0757-0446
0757-0443
0757-0443
0683-1065
RES 15K 1%
RES 11K 1%
RES 11K 1%
RES 10M 5% .25W
0699-0070
0683-2255
0683-2255
8159-0005
RES 3.16M
RES 2.2M
RES2.2M
RES-ZERO OHMS
0699-0088
0698-8826
0698-8826
RES 1.21M
RES 825K
RES 825K
0698-3459
0698-3455
0698-3455
RES 383K
RES 261K
RES 261K
112 Replaceable Parts
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Ref. Desig.
Table 5-14. A10 Control Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
R709
6680A
6681A, 6682A
6683A, 6684A
R710
6680A
6681A, 6682A
6683A, 6684A
R711
R712
R713
R714
R715
R716
R717
6680A, 6681A
6682A, 6683A, 6684A
R718
R719
R720
R721
R724
R725
6680A, 6681A
6682A, 6683A, 6684A
R726
R727, 728
R729
R730, 731
R732
R733
R734
R738
R741
6680A
6681A
6682A
6683A
6684A
R742
R743
R744
R745
RT500
S500
U500
U501, 502
U503
U504
0757-0468
0757-0464
0757-0464
RES 130K
RES 90.9K
RES 90.9K
0698-5091
0698-3160
0698-3160
0698-5091
0698-0082
0757-0442
0757-0349
0757-0447
0698-3449
RES 45K
RES 31.6K
RES 31.6K
RES 45K
RES 464 1% .125W
RES 10K 1% .125W
RES 22.6K 1%
RES 16.2K 1%
RES 28.7K 1%
not used
0757-0442
0698-3162
0757-0458
0698-8093
0698-6630
0698-3279
RES 10K
RES 46.4K 1%
RES 51.1K 1%
RES 40K .1% .lW
RES 20K .1%
RES 4.99K 1%
not used
0757-0199
0698-6359
0698-6630
0698-6359
0698-6630
0698-6619
0699-0489
0683-2255
0698-8959
RES 21.5K
RES 80K .1%
RES 20K .1%
RES 80K .1%
RES 20K .1%
RES 15K .1%
RES 16.15K .1%
RES 2.2M 5% .25W
RES 619K 1%
0757-0429
0698-3496
0757-0436
0698-3496
0698-3151
0698-4509
0698-8093
0683-0475
0698-6630
0837-0397
3101-1973
1826-2341
1826-1370
1826-0346
1826-1369
RES 1.82K
RES 3.57K
RES 4.32K
RES 3.57K
RES 2.87K
RES 80.6K 1%
RES 40K .1% .lW
RES 4.7 5% .25W
RES 20K .1%
Thermistor
SW-SL 7-lA
IC-REG TL7702BCP
IC 365
IC OP AMP
IC-VOLTAGE REG
Replaceable Parts 113
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Ref. Desig.
U506
U507
U510, 511, 512
U513, 514, 515
U516, 517
U518
U520
U521, 522
U600
U601
U602
U603
U604
U605
U606
U607, 608
U609
U610
U620, 621
U622
U623
U624
Z500
Z501
Z641
Table 5-14. A10 Control Assembly, Replaceable Parts (continued)
Keysight Part No.
Description
5080-2305
PRGMD-IC, SEC
1820-3079
IC MC74HC138N
1826-2187
IC-CONVERTER,DIA
1826-1896
IC-LINEAR
1826-1370
IC 365
1820-3081
IC MC74HC74N
1826-1231
DIA 8-DGT
1826-1409
IC 1013
1820-3199
IC MC74HC4040N
1820-2922
IC MC74HC00N
1820-3081
IC MC74HC74N
1826-2343
IC-VRGLTR,SWG
1820-2922
IC MC74HC00N
1826-0065
IC 311
1858-0083
XSTR ARY 14P-DIP
1826-0962
IC 412
1826-0890
IC 358A
1826-1343
IC-VOLTAGE REG
1826-1409
IC 1013
1826-1895
PRECISION OP-AMP
1826-1896
IC-LINEAR
1826-0161
IC 324
1902-3114
DIO-ZNR 6.19V 2%
1902-0777
DIO-ZNR lN825
1902-1377
DIO-ZNR 6.19V
114 Replaceable Parts
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6
Diagrams
Introduction
This chapter contains drawings and diagrams for troubleshooting and maintaining Keysight Series 668xA Power Supplies.
Unless otherwise specified, a drawing or diagram applies to all models of the series. Wiring connections to external
equipment are shown in the Power Supply Operating Manual.
Chapter Organization
Table 6-1 summarizes the contents of this chapter.
Table 6-1. Summary of Chapter Contents
Function
Description
See
Interconnections
Drawing identifying each circuit board, the cables between boards, and
schematic diagram for each board.
Figure 6-2
Schematics
Show test points, signal mnemonics, component-location grid coordinates,
and specific notes. General notes applicable to all schematics are given in
Table 6-4.
Al Front Panel Board.
A2 GPIB Board.
A3 FET Board.
A4 AC Input Power Board.
A5 DC Rail Board.
A6 Bias Board.
A7 Snubber Board.
A8 Fast Sense Board.
A9 Down Programming/Slow Sense Board.
A10 Control Board.
Signal names
Table of signal name mnemonics
Table 6-2
Parts location
A drawing that shows the location of components on a circuit board is
located next to the above circuit board schematic diagram.
Figure 3-18
A drawing showing location of each circuit board in the chassis is in
Chapter 3.
Test points
Description of each test point. Location of each test point is shown on the
appropriate schematic and its associated parts location drawing.
Table 6-3
Diagrams 115
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Table 6-2. Signal Name Mnemonics
Mnemonic
A(0)--A(15)
AD (O)--AD(7)
AMB_SENSE
ANA(0)--ANA(7)
ATN
BIAS_OK
BOVPROG
BSTX
cc
CCPROG
cv
CVPROG
D(0)_D(7)
D101--Dl08
DAV
DFI
DFI-EN
DPS
DN_PGM
DRIVE_A/B
EOI
FAC_CAL
FAN_PWM
FPRX
FPTX
FS
HSRQ
IFC
IMON
INH_CAL
IP
Description
Address lines
Address bus
Ambient temperature sense
Analog Signal readback bus
Attention (GPIB)
15V bias supplies have stabilized
BuFfered OV programming
BuFfered secondary transmit
Constant current status
Constant current programming
Constant voltage status
Constant voltage programming
Data lines
Data lines (GPIB)
Data valid (GPIB)
Discrete fault indicator
Discrete fault indicator enable
Downprogramming shunt
Down programming
FET drive signals
End or identify (GPIB)
Factory calibration
Fan pulse width modulation
Front panel receive serial data
Front panel transmit serial data
Fast sense
GPIB service request
Interface clear (GPIB)
Current monitor
Inhibit calibration
External current programming
Mnemonic
MSRQ
NDAC
NEG_IMON
NRFD
OV
OV_CLR
OVCMP
OVP_BIAS
OVPROG
OVSCR
PCLR
PREF
PREF_2
PREN
PRX
PTX
PWM_EN
RAM
RDY
REN
RI
ROM
SPCLR
RX
RxD
SA
SRQ
SRX
STX
TxD
UART
IPROG
ISEN
ISRQ
KO(0)-KO(5)
KI(0)--KI(5)
Current programming
Current sense
Interface service request
Keypad output data bus
Keypad input data bus
VMON
vos
VPROG
WR
Description
Microprocessor service request
Not data accepted (GPIB)
Negative current monitor
Not ready or data (GPIB)
Overvoltage
Overvoltage clear
Overvoltage comparator
Overvoltage protection bias
Overvoltage programming
Overvoltage SCR (crowbar)
Primary power clear
Primary reference voltage (2.53V)
Primary reference voltage (1.0V)
Primary remote enable
Primary receive serial data
Primary transmit serial data
Pulse width modulator enable
Random access memory
Ready
Remote enable
Remote inhibit
Read only memory
Secondary power clear
Receive serial data
Receive Serial Data
Signature analysis
Service request (GPIB)
Secondary receive serial data
Secondary transmit serial data
Transmit Serial Data
Universal asynchronous
receive/transmit
Voltage monitor
Voltage offset
Voltage programming
Write
116 Diagrams
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Table 6-3. Test Points
TEST POINT No. & Loc.
Signal Tested
Measurement and Conditions
A2 GPIB BOARD
J106-4
Primary/chassis ground
U101- 1
U101-6
+ 5V primary bias
PCLR
U101-8
PCLR*
U110-3
STX
U111-6
SRX
U119-4
FPRX
U119-18
FPTX
Connect meter or scope common here. Then
make measurements at test points
through
.
+ 5V + 0.2V
Goes high for approximately 40 ms at power on,
then goes low.
Held low for approximately 40 ms at power on,
then goes high.
Primary transmit to secondary serial data line.
Toggles between 0 and +5V.
Primary receive from secondary serial data line.
Toggles between 0 and +5V.
Primary receive from front panel serial data
line. Toggles between 0 and +5V.
Primary transmit to front panel serial data line.
Toggles between 0 and +5V.
AC Input Board
Connect meter between TP
J418-1/J417-7
J418-2/J417-8
J418-3/J417-9
K402 coil
and
and
and
, or
, or
, and measure approximately 220VAC or
440VAC. Measurements at test points through .
AC Mains Voltage
AC Mains Voltage
AC Mains Voltage
24VDC Coil Voltage
Turns on PS, and after power-on initialization
test, reads approximately 24VDC.
DC Rail Board
J430-1 (+) to J430-2 (-)
J431-1 (+) to J431-2 (-)
Rail #1 Voltage
Rail #2 Voltage
Measure approximately 290VDC
Measure approximately 290VDC
J801-4 to J801-5
J801-1 (+) to J801-2 (-)
J827-1 (+) to J827-2 (-)
J827-1 (+) to J827-3 (-)
GPIB 5V Bias
Fan voltage
Inrush relay coil
Rail relay coil
R331
R330
+C354
U310-16
U308-6
U308-7
24V Primary
-15Vs secondary bias
-25V
RELAY ON*
RESET
BIAS OK
Bias Board
+15  0.9V measure approx. 11VAC
Measure 24VDC
Measure 24VDC
Measure 24VDC after power-on initialization
test.
Measure approximately 34VAC
-15  0.9V
-22.5V to -27.5V
0V
0V
+5V
Diagrams 117
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Table 6-3. Test Points (continued)
TEST POINT No. & Loc.
Signal Tested
Measurement and Conditions
Bias Board (continued)
U308-1
U308-5
PREF
RESET*
U311-7
D317
U311-2
FAN DETECT
-25V
FAN_PWN
+2.5V
Held low for approximately 50 ms at power-on,
then goes high.
+3V
+3V
+0.6V
A3 FET Board
Test points
through
are on the A3 FET Board. Troubleshooting procedures at these points are given under
Dynamic Troubleshooting section of the FET Troubleshooting Chart (Table 3-4).
A10 Control Board
Secondary common (Sheet 1)
CC/CC DACs reference (Sheet 1)
Readback DAC reference (Sheet 1)
CVPROG (Sheets 2,4)
CVPROG (Sheets 2,4)
NOTE:
Measurements at test points through where taken under the following conditions:
1. Programming
a. Voltage = ½ scale
b. Current = ½ scale
c. OV = full scale
2. First measurement in CV mode with no load.
3. Second measurement in CC mode with output shorted.
+C500
U504-6
U503-7
U513-6
U514-6
VMON (Sheet 4)
CV CONTROL (Sheet 4)
CV* (Sheet 4)
CC CLAMP AMP output (Sheet 4)
1ST I AMP output (Sheet 4)
2ND I AMP output (Sheet 4)
CC CONTROL (Sheet 4)
CC* (Sheet 4)
FAST SENSE AMP (Sheet 3)
RAMP GEN (Sheet 3)
RAMP GEN (Sheet 3)
DIVIDER output (Sheet 3)
SUMMING POINT (Sheet 3)
DEADTIME LATCH (Sheet 3)
SUMMING COMPARATOR
(Sheet 3)
U621-1
U621-7
U502-2
U624-1
U622-6
U620-7
U620-1
U502-3
Y608-7
U607-7
U607-1
U602-9
U605-3
U602-6
U605-7
CV mode =0V
CV mode =+2.2V
CV mode =0V
CV mode =0V
CV mode =+10V
CV mode =+5V
CV mode = -4V
See Figure 6-1
See Figure 6-1
See Figure 6-1
See Figure 6-1
See Figure 6-1
See Figure 6-1
CC mode = 5V
CC mode = +2.2V
CC mode = -0.4V
CC mode = +4.5V
CC mode = +0.4V
CC mode = 0V
CC mode = 0V
118 Diagrams
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Table 6-3. Test Points (continued)
TEST POINT No. & Loc.
Signal Tested
Measurement and Conditions
A10 Control Board (continued)
DIVIDER CLOCK (Sheet 3)
See Figure 6-1
DIVIDER RESET (Sheet 3)
See Figure 6-1
ON LATCH CLOCK (Sheet 3)
See Figure 6-1
ON LATCH (Sheet 3)
See Figure 6-1
Held high for approximately 12 seconds at
PWM_EN (Sheet 3)
power-on, then goes low.
VOS (Sheet 3)
+5  0.2V
U600-10
U601-6
U601-3
U604-3
U603-3
U603-13
NOTE: Temporarily move both scope leads to J511 for TP
DRV A, DRV B (Sheet 3)
See Figure 6-1
+5V
+5.4V
OVREF (Sheets 1,3)
CV Mode
DP CONTROL (Sheet 3)
Not Applicable
CV Mode
DP CONTROL (Sheet 3)
+13V
+1V
PREF_2 (Sheets 1,3)
0V
DN PGM (Sheets 1,3)
0V
DP_TST (Sheet 3)
OV COMPARATOR (Sheet 3)
CV Mode
+1.5V
J511-1,2
U502-14
U501-7
Q602,C
U608-7
U630-11
U630-12
D660-AN
U502-12
CC Mode
-0.14V
CC Mode
0V
CC Mode
+3.25V
General Schematic Notes
The following table lists summary information about notes appearing in schematic diagrams.
Table 6-4. General Schematic Notes
1.
2.
3.
4.
5.
All resistors are in ohms 1%, 1/8W, unless otherwise specified.
All capacitors are in microfarads unless otherwise specified.
Signal lines that are terminated by flags continue on other sheets, and may also go to other locations on the same sheet.
Example: CVPROG (SH.2 8C); "SH.2 8C" indicates the sheet number and the coordinates on that sheet where the
CVPROG signal line goes.
Unterminated signal lines go to a least one other location on the same sheet.
Unless otherwise noted, bias connections to integrated-circuit packages are as follows:
14-pin packages
16-pin packages
20-pin packages
Common
pin 7
pin 8
pin 10
+ 5V
pin 14
pin 16
pin 20
Diagrams 119
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Figure 6-1. Test Point Waveforms for Table 6-3
120 Diagrams
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FRONT PANEL
S1
5185
1343
Figure 6-2. Circuit Board Cabling Diagram
Diagrams 121
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Figure 6-3. A1 Front Panel Board, Component and Test Point Location
122 Diagrams
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Figure 6-4. A1 Front Panel Board, Schematic Diagram
NOTE: This LED Board is only used on earlier version Keysight 668xA models.
Refer to Appendix A Backdating, change 10 for more information.
Figure 6-5. LED Board, Component and Test Point Location
Figure 6-6. LED Board, Schematic Diagram
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Figure 6-7. A2 GPIB Board, Component Location
2
3
4
5
6
7
1
8
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Figure 6-8. A2 GPIB Board, Schematic Diagram
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Figure 6-9. A3 FET Board, Component and Test Point Location
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Figure 6-10. A3 FET Board, Schematic Diagram (sheet 1 of 2)
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Figure 6-10. A3 FET Board, Schematic Diagram (sheet 2 of 2)
12
11
10
9
Figure 6-11. A4 AC Input Board, Component and Test Point Location
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Figure 6-12. A4 AC Input Board, Schematic Diagram
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13
14
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Figure 6-13. A5 DC Rail Board, Component and Test Point Location
13
14
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Figure 6-14. A5 DC Rail Board, Schematic Diagram
19
17
18
16
15
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Figure 6-15. A6 Bias Board, Component and Test Point Location
19
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Figure 6-16. A6 Bias Board, Schematic Diagram (Sheet 1of 2)
17
18
16
15
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Figure 6-16. A6 Bias Board, Schematic Diagram (Sheet 2 of 2)
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Figure 6-17. Power Mesh, Schematic Diagram, Models 6680A, 6681A Only
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Figure 6-18. Power Mesh, Schematic Diagram Models 6682A, 6683A, 6684A Only
Figure 6-19. A7 Snubber Board, Component Location
Figure 6-20. A7 Snubber Board, Schematic Diagram
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Figure 6-22. A8 Fast Sense Board, Schematic Diagram
Figure 6-21. A8 Fast Sense Board, Component Location
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Figure 6-23. A9 Down Programming/Slow Sense, Component Location
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Figure 6-24. A9 Down Programming/Slow Sense, Schematic Diagram
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45
44
42
41
47
46
48
43
63
53
55
51
50
38
49
37
21
36
22
20
39
40
36
60
62
61
59
54
52
57
58
56
64
Figure 6-25. A10 Control Board, Component and Test Point Location
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21
22
36
20
37
38
63
Figure 6-26. A10 Control Board, Schematic Diagram (Sheet 1 of 4)
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39
40
64
Figure 6-26. A10 Control Board, Schematic Diagram (Sheet 2 of 4)
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50
58
54
56
52
57
51
61
59
53
49
60
55
62
65
66
Figure 6-26. A10 Control Board, Schematic Diagram (Sheet 3 of 4)
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43
39
41
48
42
47
45
46
40
44
Figure 6-26. A10 Control Board, Schematic Diagram (Sheet 4 of 4)
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A
Backdating
Manual backdating describes changes that must be made to this manual for power supplies whose serial numbers are lower
than those listed in the title page to this manual.
Look in the following table and locate your Keysight model. Then look at each serial number listed for this group. If the
serial number of your power supply is prior to any of the serial number(s) listed, perform the change indicated in the
Change column. Note that, several changes can apply to your supply.
Serial Numbers
3318A 00111
3318A 00116
3502A 00126
3619A 00167
US36480101
SG41000110
3319A 00154
3336A 00164
3350A 00172
3350A 00183
3350A 00193
3506A 00218
3619A 00383
US36400101
MY41000114
3349A 00104
3349A 00108
3514A 00123
3514A 00168
3624A 00193
US36440101
MY41000106
Change
Model 6680A
1, 2, 4, 5, 6
3
7
9
10
10
Model 6681A
4
1
2, 6
5
3
7
9
10
10
Model 6682A
6
3
7
8
9
10
10
Change 1
In Table 5-14 A10 Control Board
DELETE C548, 0.1uF 50V P/N 0160-4835 in parallel
with RT 500
In Table 5-7
DELETE
ADD
CHANGE
Change 2
A3 FET Board
C228, 231, 2000pF 100V P/N 0160-2301
C228, 6800pF 100V P/N 0160-4904
R247, from 75K P/N 0757-0462, to
42.2K 1% 1/8W P/N 0698-3450.
R249, from 13.1K P/N 0757-0444, to
7.5K 1% 1/8W P/N 0757-0440
Serial Numbers
3349A 00104
3349A 00108
3514A 00123
3514A 00178
3619A 00203
US36420101
MY41000109
3339A 00103
3405A 00108
3405A 00109
3514A 00118
3514A 00188
3514A 00257
US36410101
MY41000115
Change
Model 6683A
6
3
7
8
9
10
10
Model 6684A
5
3
6
7
8
9
10
10
Change 2 continued
In Table 5-7 A3 FET Board
CHANGE R250, from 60.4K P/N 0698-3572 to
40.2K 1% 1/8W P/N 0698-3499.
R253, from 12.5K P/N 0698-6533 to
17.8K 1% 1/8W P/N 0698-3136.
C229, from 0.022uF P/N 0160-4918 to
0.01uF 100V Ceramic P/N 0160-4832.
In Table 5-9 A5 DC Rail Board
DELETE C418, 0.022uF 250VAC "Y" rated P/N
0160-4048
Fuse Clips, REF F420 & 421 ¼” P/N
2110-0726, qty, 4.
ADD Fuse Holder, REF F420 & 421, 5 x
30mm P/N 2110-0689, qty 2.
CHANGE F420 & 421, from 0.5A 500V P/N
2110-0934 to 0.5A 500V 5x30mm P/N
2110-0921.
Backdating 149
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Change 3
In Table 5-14 A10 Control Board
DELETE C548, 0.1uF 50V P/N 0160-4835 in parallel
with RT500.
RT500, P/N 0837-0412.
Pins, P/N 0360-1498, qty. 2
Change 10 continued
In Table 5-10 A6 Bias Assembly
DELETE R830, ZERO OHMS, P/N 8159-0005.
ADD D830 DIODE IN4150, P/N 1901-1098
Change 4
In Table 5-14 A10 Control Board
DELETE ASSEMBLY, relay contactor P/N
5060-3593, qty. 1.
ADD Dust cover for relay, P/N 9222-1870.
Retainer clip for relay, P/N 1460-2317.
Relay, P/N 0490-1919
Change 5
In Table 5-8 A4 AC Input Board
DELETE C428, 429, and 430, P/N 0160-7898.
R435, 436, and 437, P/N 0698-3609.
Change 6
In Table 5-6 A2 GPIB Board
CHANGE A2 GPIB board from P/N 5060-3591 to P/N
5060-3552. (see Table A-1 and Figure A-1)
Change 7
In Table 5-6 A2 GPIB Board
CHANGE U114 from P/N 1826-0536, to LM309K
P/N 1820-0430.
Change 8
In Table 5-13 A9 Downprogrammer/Slow Sense Board
DELETE Insulator, REF Q981, 982
CHANGE Q981, 982 from P/N 1855-1003, to
POWER MOSFET P/N 1855-0835.
Change 9
In Table 5-4 A1 Front Panel Board
DELETE PCA (keypad), P/N 5063-3407.
CHANGE KNOB (Ref. RPG) from P/N 0370-3238, to
P/N 10370-1091.
RPG - OPTICAL ENCODER from P/N
0960-0912 to P/N 0960-0822.
U4 from 5080-2466 to P/N 5080-2304.
Change 10
Main Chassis, Mechanical parts
CABLE, P/N 5185-1343
SENSOR-MOISTURE, P/N 0960-0882.
Front Panel, Mechanical parts
LABEL from PN 5185-1342, to P/N 50802245.
In Table 5-8 A4 AC Input Assembly
ADD R400-405, 75K 5%, 2W, P/N 0764-0027.
In Table 5-3
DELETE
ADD
In Table 5-4
CHANGE
150 Backdating
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Table A-1. A2 GPIB Parts List
Ref Desig.
C102-105
C106
C107,108
C109-111,114,115,121
C122
C123
C124
C125
C126,127
C128
C129-134
C135
C136
C138-140
D107-110
D111-114
D115,116
D119,120
F101
J101
J106
J107,108,114,115
L101
P101
Q101
R103
R104
R105
R106
R107
R108
R109
R111,114
R115-117
R118
R119
R120-122
R123
R130-133
R134
R135,136
R137
Keysight Part No.
ELECTRICAL PARTS
0160-4822
0180-0155
0160-4787
0160-5422
0180-3325
0160-4822
0180-0228
0160-5422
0160-4807
0160-4281
0160-5422
0180-0228
0160-4803
0160-5422
1901-0731
1901-1098
1901-1080
1902-0766
2110-0699
1252-0268
1251-4926
1251-7330
9100-1610
1251-4245
1853-0089
0757-0442
0698-3155
0683-1065
0698-4037
0698-0082
0757-0401
0698-0082
0698-3155
0698-4037
0757-0280
0698-8827
0698-3155
0698-0082
0698-3155
0683-1015
0698-3155
0757-0401
Description
Capacitor 1000pF 5%
Capacitor 2.2F 20V
Capacitor 22pF 5% 100V
Capacitor 0.047F 20%
Capacitor 25V
Capacitor 1000pF 5%
Capacitor 22F 15V
Capacitor 0.047F 20%
Capacitor 33pF 5% 100V
Capacitor 2200pF 20%
Capacitor 0.047F 20%
Capacitor 22F 15V
Capacitor 68pF 5% 100V
Capacitor 0.047F 20%
Diode power rectifier
Diode 1N4150
Diode 1N5817
Diode zener 18.2V 5%
Fuse subminature 5AM, 125V
Connector receptacle (GPIB)
Connector receptacle (test header)
Connector receptacle phone
Inductor 150nH 20%
Connector plug 2-pin (ac bias)
Transistor PNP 2N4917
Resistor 10K 1% 0.125W
Resistor 4.64K 1%
Resistor 10M 5% 0.25 W
Resistor 46.4  1%
Resistor 464  1% 0.125W
Resistor 100  1% 0.125W
Resistor 464  1% 0.125W
Resistor 4.64K 1%
Resistor 46.4 1%
Resistor 1K 1% 0.125W
Resistor 1M 1% 0.125W
Resistor 4.64K 1%
Resistor 464  1% 0.125W
Resistor 4.64K 1%
Resistor 100  5% 0.25W
Resistor 4.64K 1%
Resistor 100  1% 0.125W
Backdating 151
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Table A-1. A2 GPIB Parts List (continued)
Ref Desig.
TB101
U101
U106
U108
U109
U110,111
U112
U113
U114
U115
U116
U117
U118
U119
U120
U121
VR101
VR102
VR103,104
W101
Y101
Keysight Part No.
ELECTRICAL PARTS
0360-2312
1826-0468
5080-2152
1818-4111
1820-6789
1990-0444
1820-3210
1990-0543
1821-1479
lLH4-0001
1820-2724
1820-2549
1820-4185
5080-2153
5080-2154
1820-0430
1902-0766
1902-0959
1902-0049
1258-0209
0410-2109
Description
Terminal block (digital control)
IC MC3423PI
IC DROM GPIB
IC MCM 6164C55
IC interface
IC Opto isolator
IC 68B50
IC Opto isolator
IC MPU
IC GP-IB transceiver
IC SN74ALS573BN
IC 8291A
IC interface
IC GAL programmed GPIB
IC GAL programmed IIPIB
IC LM309K
Diode zener 18.2V 5%
Diode zener 11V 5%
Diode zener 6.19V 5%
Jumper
Crystal oscillator 12.000MHz
MECHANICAL PARTS
---------
1205-0758
0340-1277
0535-0031
0515-0642
0515-0911
1200-0567
1200-0639
1200-1274
Heatsink (U121)
Insulator (Y101)
Nut hex w/lockwasher (J101)
Screw (U121)
Screw M3x0.5 (J101)
Socket IC 28-pin (U106)
Socket IC 20-pin (U119,120)
Socket IC (U114)
152 Backdating
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Figure A-1. A2 GPIB Component Parts List
Backdating 153
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Index
A
A1 Front Panel Board, test header ............................................................................................................................... 57
A2 GPIB Board, test header ........................................................................................................................................ 57
A3 FET Board
dynamic troubleshooting ...................................................................................................................................... 55
static troubleshooting............................................................................................................................................ 55
test connections .................................................................................................................................................... 55
test points ........................................................................................................................................................ 55, 56
analog port ..................................................................................................................................................................... 8
B
bias supply ................................................................................................................................................................... 36
C
cable
W3 ribbon ............................................................................................................................................................. 79
W4 phone ............................................................................................................................................................. 79
W5 phone ............................................................................................................................................................. 79
W6 ac bias ............................................................................................................................................................ 79
Cabling diagram ........................................................................................................................................................ 146
calibration constants, factory ....................................................................................................................................... 66
calibration password .................................................................................................................................................... 65
calibration, post-repair ................................................................................................................................................. 65
calibration procedure ..................................................................................................................................................... 7
CC annunciator ............................................................................................................................................................ 55
CC load effect, testing ................................................................................................................................................. 26
CC noise (PARD), testing............................................................................................................................................ 18
CC PARD, defined ...................................................................................................................................................... 18
Circuits
isolator board ........................................................................................................................................................ 84
conductive table mat ............................................................................................................................................... 9
conductive wrist strap ............................................................................................................................................. 9
configuration jumper
FACTORY PRESET CAL ................................................................................................................................... 59
FLT/INH............................................................................................................................................................... 59
INHIBIT CAL ...................................................................................................................................................... 59
RELAY LINK ...................................................................................................................................................... 59
SA mode ............................................................................................................................................................... 59
current, maximum programmable ............................................................................................................................... 19
current, --CC ................................................................................................................................................................ 19
current programming and readback accuracy, testing ................................................................................................. 19
current sink and readback accuracy, testing ................................................................................................................ 19
CV/CC status annunciators .......................................................................................................................................... 54
CV load effect, defined ................................................................................................................................................ 16
CV load effect, testing ................................................................................................................................................. 16
CV noise (PARD), defined .......................................................................................................................................... 17
CV noise (PARD), testing ........................................................................................................................................... 17
CV source effect, defined ............................................................................................................................................ 17
CV source effect, testing.............................................................................................................................................. 17
Index 155
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CV transient response waveform ................................................................................................................................. 18
CV transient recovery time, defined ............................................................................................................................ 18
CV transient recovery time, testing ............................................................................................................................. 18
CV voltage programming and readback accuracy, testing........................................................................................... 16
D
Diagram cabling ........................................................................................................................................................ 146
DIG CNTL port, configuring ....................................................................................................................................... 58
disassembly procedures ............................................................................................................................................... 71
downprogrammer FETs, location of ............................................................................................................................ 74
E
electronic load ....................................................................................................................................................... 12, 20
error, checksum ........................................................................................................................................................... 35
error code
E1 ......................................................................................................................................................................... 35
E10 ....................................................................................................................................................................... 35
E11 ....................................................................................................................................................................... 35
E12 ....................................................................................................................................................................... 35
E2 ......................................................................................................................................................................... 35
E3 ......................................................................................................................................................................... 35
E4 ......................................................................................................................................................................... 35
E5 ......................................................................................................................................................................... 35
E6 ......................................................................................................................................................................... 35
E7 ......................................................................................................................................................................... 35
E8 ......................................................................................................................................................................... 35
E9 ......................................................................................................................................................................... 35
error code, over GPIB .................................................................................................................................................. 35
error code, selftest........................................................................................................................................................ 35
error message
CAL DENIED ...................................................................................................................................................... 67
DACS ................................................................................................................................................................... 35
EE CHKSM .......................................................................................................................................................... 35
EE WRITE ERR ................................................................................................................................................... 35
FP RAM ............................................................................................................................................................... 35
FP ROM ............................................................................................................................................................... 35
FRAMING............................................................................................................................................................ 35
GPIB ..................................................................................................................................................................... 35
PASSWD ERROR ............................................................................................................................................... 67
PRI IRAM ............................................................................................................................................................ 35
PRI ROM .............................................................................................................................................................. 35
PRI XRAM ........................................................................................................................................................... 35
SBuF FULL .......................................................................................................................................................... 35
SBuF OVERRUN................................................................................................................................................. 35
SEC 5V ................................................................................................................................................................. 35
SECONDARY DWN ........................................................................................................................................... 35
SEC RAM ............................................................................................................................................................ 35
SEC ROM ............................................................................................................................................................ 35
SERIAL DOWN................................................................................................................................................... 35
SERIAL TIMOUT ............................................................................................................................................... 35
TEMP ................................................................................................................................................................... 35
UART OVERRUN ............................................................................................................................................... 35
UART PARITY .................................................................................................................................................... 35
error message, selftest .................................................................................................................................................. 35
156 Index
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errors
calibration ............................................................................................................................................................. 35
selftest................................................................................................................................................................... 35
ESD ......................................................................................................................................................................... 9, 33
F
factory calibration constants ........................................................................................................................................ 65
firmware, revisions ........................................................................................................................................................ 8
firmware revisions ....................................................................................................................................................... 64
Form, performance test record ..................................................................................................................................... 25
front panel EEPROM
factory cal location ............................................................................................................................................... 67
initialization of ..................................................................................................................................................... 67
transferring constants to ....................................................................................................................................... 67
front panel operation ...................................................................................................................................................... 7
front panel, testing ....................................................................................................................................................... 34
G
GPIB error 2 ................................................................................................................................................................ 66
GPIB interface, testing ................................................................................................................................................ 34
I
*IDN query .................................................................................................................................................................. 58
inhibit calibration jumper ............................................................................................................................................ 66
Isolator board circuits .................................................................................................................................................. 87
J
jumper
DIG I/O ................................................................................................................................................................ 59
FACTORY PRESET CAL ................................................................................................................................... 59
INHIBIT CAL ...................................................................................................................................................... 59
NORM .................................................................................................................................................................. 59
K
keypad ......................................................................................................................................................................... 14
Keysight 50504A oscilloscope .................................................................................................................................... 34
Keysight 545A logic probe .......................................................................................................................................... 34
L
line fuse, replacing ......................................................................................................................................................... 9
line voltage, conversion of ............................................................................................................................................. 9
M
manual backdating ......................................................................................................................................................... 8
manual changes sheet .................................................................................................................................................... 8
manufacturing date, determining ................................................................................................................................... 8
message
PWR ON INIT................................................................................................................................................ 35, 65
Index 157
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Mnemonics signal names ........................................................................................................................................... 140
mutual coupling, test lead ............................................................................................................................................ 14
N
noise, testing ................................................................................................................................................................ 14
O
operating manual ........................................................................................................................................................... 7
oscilloscope, Keysight 54504A ................................................................................................................................... 15
output heatsink assembly ............................................................................................................................................. 82
output rectifiers
location of ............................................................................................................................................................. 75
replacing ............................................................................................................................................................... 75
overvoltage, maximum programmable ........................................................................................................................ 14
P
Performance test record form ...................................................................................................................................... 25
performance tests, CC .................................................................................................................................................. 19
performance tests, CV ................................................................................................................................................. 16
power FETs, replacing ................................................................................................................................................. 47
power-on selftest.......................................................................................................................................................... 34
power-on selftest, disabling ......................................................................................................................................... 34
protective earth ground .................................................................................................................................................. 9
R
record sheet, test .......................................................................................................................................................... 13
reference supply........................................................................................................................................................... 34
regulation, voltage ....................................................................................................................................................... 14
removing
A1 Front Panel Assembly ..................................................................................................................................... 74
A1 Front Panel Board ........................................................................................................................................... 74
A2 GPIB Board .................................................................................................................................................... 72
A3 FET Board ...................................................................................................................................................... 73
A4 AC Input Board .............................................................................................................................................. 72
A5 Control Board ................................................................................................................................................. 73
A6 Output Filter Board ......................................................................................................................................... 73
A7 Snubber Board ................................................................................................................................................ 75
ac input filter ........................................................................................................................................................ 72
fan ......................................................................................................................................................................... 73
heatsink assembly ................................................................................................................................................. 73
keypad .................................................................................................................................................................. 75
L900 output choke ................................................................................................................................................ 75
line switch............................................................................................................................................................. 72
output subchassis .................................................................................................................................................. 75
rear panel .............................................................................................................................................................. 72
RFI shield ............................................................................................................................................................. 72
RPG controls ........................................................................................................................................................ 73
T900 output transformer ....................................................................................................................................... 72
top cover ............................................................................................................................................................... 73
Replaceable parts for A2 isolator board .................................................................................................................... 104
resistor
current monitoring ................................................................................................................................................ 12
158 Index
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load ....................................................................................................................................................................... 12
resistor, current monitor .............................................................................................................................................. 12
resistor, current monitoring ......................................................................................................................................... 12
S
SA ................................................................................................................................................................................ 58
SA secondary interface, exiting test ............................................................................................................................ 58
SA signals
A5 microprocessor................................................................................................................................................ 59
SA signals, secondary interface ................................................................................................................................... 59
SA signatures, identical ............................................................................................................................................... 60
SA signatures, similar .................................................................................................................................................. 60
SA test header jumper .................................................................................................................................................. 60
Schematic notes ......................................................................................................................................................... 145
SCPI programming ........................................................................................................................................................ 8
secondary interface, testing ......................................................................................................................................... 33
sense terminals ............................................................................................................................................................. 13
serial number ................................................................................................................................................................. 7
serial number prefix ....................................................................................................................................................... 7
settling time ................................................................................................................................................................. 13
Signal name
mnemonics.......................................................................................................................................................... 140
Signals
+5V bias voltage ................................................................................................................................................. 140
BSTx................................................................................................................................................................... 140
PCLR .................................................................................................................................................................. 140
RESET* .............................................................................................................................................................. 140
RxD .................................................................................................................................................................... 140
SPCLR* .............................................................................................................................................................. 140
SRx ..................................................................................................................................................................... 140
TxD..................................................................................................................................................................... 140
XFMR Tl ............................................................................................................................................................ 140
slew rate ....................................................................................................................................................................... 13
T
test
selftest................................................................................................................................................................... 11
test equipment, troubleshooting ................................................................................................................................... 33
test headers .................................................................................................................................................................. 35
test leads ...................................................................................................................................................................... 13
test measurements, cc mode ........................................................................................................................................ 19
test points, troubleshooting .......................................................................................................................................... 35
Test point waveforms ................................................................................................................................................ 144
tests
constant-current mode .......................................................................................................................................... 19
constant-voltage mode .......................................................................................................................................... 14
independent order of ............................................................................................................................................. 14
operation verification............................................................................................................................................ 14
performance .......................................................................................................................................................... 14
programming ........................................................................................................................................................ 13
performance test record ........................................................................................................................................ 25
TORX screws .............................................................................................................................................................. 71
transformer, variable-voltage ....................................................................................................................................... 18
transient recovery time ................................................................................................................................................ 18
Index 159
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Troubleshooting
test points ............................................................................................................................................................ 142
troubleshooting chart
output held high .................................................................................................................................................... 36
OV at turn-on........................................................................................................................................................ 36
secondary downprogramming .............................................................................................................................. 36
troubleshooting charts.................................................................................................................................................. 36
*TST? ................................................................................................................................................................... 34
*TST? Query ........................................................................................................................................................ 34
U
UNREGULATED annunciator .................................................................................................................................... 55
using *IDN query .......................................................................................................................................................... 8
V
voltage, maximum programmable ............................................................................................................................... 13
160 Index
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6HULDO1XPEHUV
For instruments with serial numbers:
Keysight 6680A: SG41000110 and above
Keysight 6681A: MY41000114 and above
Keysight 6682A: MY41000106 and above
Keysight 6683A: MY41000109 and above
Keysight 6684A: MY41000115 and above
For manual updates, a change page may be included.
For instruments with lower serial numbers, or instruments
with the older two-part serial number format, see Appendix A.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
This information is subject to change without notice.
© Keysight Technologies 1993, 2000, 2014
Edition 3, December 2014
5960-5590
www.keysight.com
162 Index
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