Commodore 1526 Service manual

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Commodore 1526 Service manual | Manualzz

SERVICE MANUAL

1526

MPS 802

PRINTERS

4023

APRIL 1985 PN—31400303

Commodore Business Machines, Inc.

1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S.A.

Commodore makes no expressed or implied war ranties with regard to the information contained herein. The information is made available solely on an as is basis, and the entire risk as to quality and accuracy is with the user. Commodore shall not be liable for any consequential or incidental damages in connection with the use of the information con tained herein. The listing of any available replace ment part herein does not constitute in any case a recommendation, warranty or guaranty as to quality or suitability of such replacement part.

Reproduction or use without expressed permission, of editorial or pictorial content, in any matter is prohibited.

This manual contains copyrighted and proprietary information. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permis sian of Commodore Eiectronics Limited.

Copyright © 1985 by Commodore Electronics Limited.

All rights reserved.

CONTENTS

Title

SPECIFICATIONS

SET UP AND TESTING

RIBBON CARTRIDGE

PAPER INSTALLATION

SELF TEST

ACCESSORIES PARTS LIST

MAINTENANCE

FUNCTIONAL BLOCK DIAGRAM

CIRCUIT ThEORY

POWER SUPPLY

RESET LOGIC

CLOCK CIRCUIT

MICROPROCESSOR LOGIC

PAPER FEED MOTOR

CARRIAGE MOTOR

PRINT WIRE DRIVE

PRINT WIRE COIL PROTECTION

PAPER CONTROL LOGIC

CARRIAGE POSITION AND HOME SENSOR

1526

• MPS 802 INTERFACE LOGIC

4023 INTERFACE LOGIC

TROUBLESHOOTING GUIDES

PCB PARTS LIST

ROMUPCRIDES

1526

:i,IPS 802 SCHEMATIC

DEVICE NUMBER CHANGE

4023 SCHEMATIC

MECHANiCAL ADJUSTMENTS

HEAD SHIFT LEVER

PRINT HEAD

HOME SENSOR

WIRING DIAGRAM

MECHANICAL DISASSEMBLY

ASSEMBLY NOTES

CASE WORK’POWER SUPPLY

MECHANICAL ASSEMBLIES

Page

1

7

15

16

17

11

12

13

14

8

9

10

18

19

22

24

24

25

25

4

5

2

3

5

6

29

36

37

38

26

26

27

28

SPECIFICATIONS

• 1526

MPS 802

• 4023.

PRINT METHOD

CHARACTER MATRIX

CHARACTERS

GRAPHICS

CHARACTER CODES

PRINT SPEED

MAXIMUM COLUMNS

LINE FEED SPACING

LINE FEED SPEED

PAPER FEED

PAPER WIDTH

MULTIPLE COPIES

POWER REQUIREMENTS

• Bi-directional impact dot matrix

8 X 8 Dot Matrix

Upper & lower case letters with true descenders. Numerals & symbols. All PET graphic characters

8 Vertical dots

— maximum 640 columns

CBM ASCII code

• 60 CPS

• 80 Columns

6 Lines/inch in character mode

• 9 Lines/inch in graphics mode

5 Lines/sec in character mode

• 75 Lines/sec in graphics mode

Pin feed

45 to 10” Width (including tractor feed holes>

• 85” Width (after tractor holes>

Original plus maximum of 3 copies

120 Volts AC, 60 Hz, 1.5 Amp

• 15261MPS 802

INTERFACE

COMPUTERS

SERIAL

VIC2O, C64,

SX64, C16,

PLUS 4

4023

INTERFACE

COMPUTERS

IEEE Protocol

4032, 8032,

8096, SP9000,

B-MODEL

SET UP AND TESTING

VISUAL OBSERVATION is particularly important before attempting to repair a printer. Always check for physical damage to the mechanism. Remove any loose debris that may have accumulated inside the unit.

Ribbon Cartridge

PRINT HEADfi

J(

RIBBON CARTRIDGE

Before installing the ribbon cartridge, turn the printer off. By carefully pushing the carriage, position the print head in the center of the unit. Turn the dial knob on the cartridge in the direction of the arrow until the ribbon is taut. Insert the cartridge in the hooks provided and push down. The ribbon must be positioned between the print head and the ribbon guide.

CAUTION!

When installing or removing the ribbon cartridge, do not touch the FPC cable. Check that the FPC cable remains in the down position as shown.

FPC CABLE

FPC

2

SET UP AND TESTING (Continued)

Paper Installation

TRACTOR.

PAPER HOLD-DOWN

SHAFT

To install paper, turn the printer off, remove the paper rack and lift the soundproof cover. Lift the paper hold down shaft and raise the covers of the left and right tractors to allow access to the tractor pins. Align the paper perforations with the tractor pins and close the covers, The left tractor assembly must be firmly pressed against the left stopper. The right tractor assembly slides to allow adjustment for paper width.

Once the paper is aligned in the tractor, turn the manual feed knob while guiding the paper to its posi tion behind the platen (See the paper path figure below). Standard paper may be used by simply stalling it in in front of the tractor and behind the platen, using the manual feed knob to friction feed the paper.

PAPER

PA

TRACTOR PIN

TRACTOR

PLATEN

3

SET UP AND TESTING (Continued)

Self Test

This unit has a pre-programmed self-checking capability. The program may be used to test the print head operation, print quality and printer mechanism (ribbon feed function, linefeed, etc).

The self-test function is initiated by pressing the paper advance switch while turning on the power supply switch. NOTE: Do not operate the self-test function in the no-paper condition.

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S

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S 6PII-aH...r--HII

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II-,H....r-,-1tI

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I H...rr-1I I I

‘ ftaH...rr1I I

I-.H_rHl

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S

(I.’irHI

SAMPLE SELF TEST PRINT-OUT

Additional Testing

A sample program should be run to test for proper interface operation. It is normally recommended that the “customer complaint” be checked by verifying printer operation during print-out from an appropriate program.

4

Cleaning

ACCESSORIES PARTS LIST

C 314597-01

C 314598-01

C 314598-02

C 314598-03

C 314599-01

C 1515001-01

C 903508-04

1526/802/4023

1526

MPS8O2

4023

1526/802/4023

1 526/MPS8O2

1526/802/4023

PAPER RACK

USER’S MANUAL

USER’S MANUAL

USER’S MANUAL

RIBBON

6PIN DiN CABLE

POWER CORD

MAINTENANCE

CAUTION

L

Do not use chemicals to clean any of the printer parts.

Using a clean, dry brush, remove dust and debris from the ribbon guide, print head, platen area and tractors often. Periodically remove the top case and brush any accumulated dust or particles from the unit.

Lubrication

CAUTION

Do not allow oil or grease to contact the motors, sensors, tractors, platen, ribbon or print head.

Oil the carriage pillars, as indicated, every 500,000 lines or once a year. Use dry guaze to clean the dust and dirt

LUB

A clean, light grease is used to protect the meshing parts of the plastic gears. Also, the 4 springs on the unit may require lubrication. They can be found behind the paper guide, on the roller unit (2>,

5

Functional Block Diagram Data Flow Theory

The 1526, MPS 802 and 4023 printers are functionally the same, with the exception of the interface circuits. The 1526 and MPS 802 printers have a serial interface, and the 4023 printer has an IEEE interface. The data flow is the same for all of the printers.

The Interface

The 1526 and MPS 802 SerIal Interface

Serial data is received at a rate determined by the clock input. The serial data signal is inverted, then input to the IC U4D. IC U4D converts serial data to parallel data.

The 4023 IEEE Interface

Parallel data (DIOl -D108) is received on the Port B inputs of U4D (PBO-PB7). U4D

acts

as a buffer, allowing synchronization between the processor read operation and the receive data rate. Handshake signals ATN (Attention), RFD (Ready for Data), and DAC (Data Accepted) provide synchronization be tween the transmitting device and the printer.

Proceseor Logic

Printer Data Flow

Parallel data from the interface is present on the data bus at times selected by the operating system program. The operating system (program in ROM) monitors the data being received from the inter face. Receive data can be printable characters or control codes. Printable characters are stored in

RAM. 256 bytes of RAM are available for character storage. 128 bytes of RAM are in U4D, and 128 bytes in U5D. This RAM is called the TEMPORARY LINE BUFFER. Control codes are interpreted as special function commands and are executed at the time they are received. The number of lines per inch and the characters per inch are examples of special function commands.

Printable characters are stored in the LINE BUFFER. When the carriage return character is received, all the characters stored in the LINE BUFFER are converted to DOT MATRIX codes by the operating system. The DOT MATRIX codes are stored in ROM with the operating system. The DOT MATRIX data is written into port B of U5D. The driver circuits activate the proper print wires to form the characters, one column at a time. As a character is being printed, the head (carriage) stepper motor moves one dot column position at a time. A position sensor outputs pulses that are used to indicate head position any time it is not home (far left). The paper stepper motor moves paper up one line at a time when a carriage return is sensed. The operating system program monitors the position sen sor output, and generates the signals that are passed to IC U6D port A controlling the motors.

———

SERIAL 1526

INTERFACE

——————1

I/o

/

DATA

A61

MICRO

PROCESSOR

INVERTERS

DEVICE

ADDRESS

SELECTION

4023 IEEE

INTERFACE

I/O

DIO1

DIO8

DAC

RFD

D

R

V

E

R

S

ED!

ATN

-

P

0

R

T

B

U4D

RS

6532

128 X 8

-—-,

0!

R

AO-A6

4

Si

DATA

BUS

I

T

DATA BUS

A0 A121

DATA BUS

RS (RAM SELECT)

Si (SELECT I/O 1)

S2 (SELECT I/O 2)

S3 (SELECT I/O 3)

ROM (SELECT ROM)

AO-A6

RS

FUNCTIONAL BLOCK DIAGRAM

I/o

PAPER FEED SWITCH

PAPER OU1

HOME POSITION DET

HEAD POSITION DET

INDICATOR

6

CIRCUIT THEORY

The Power Supply

The Power Supply generates two outputs, +5VDC and +26VDC. Both outputs are regulated. The

5VDC output supplies the microprocessor and TTL circuits, The

+

26VDC output supplies the print wire coils and the paper feed and carriage motor drive circuits.

+5VDC Supply

VR1 is a series regulator. The series regulator keeps the output voltage constant when the load varies.

Capacitive filtering eliminates most of the ripple voltage on the output. CR26 is a full wave bridge rectifier which converts the AC voltage generated from the top secondary winding of the power transformer to DC voltage.

+26VDC Supply

A shunt type regulator circuit generates the constant 26 VDC output.

+26 VDC REGULATOR CIRCUIT

‘LOAD Q23 VOUT VF3 + VCR23

263V

=

—7V +27V

UNREG

DC

The output voltage is regulated at 26,3VDC because the base to emitter voltage of QI 9 opposes the voltage developed across CR23. Most of the load current passes through the power transistor

Q23. CR27 is a full wave bridge rectifier which converts the AC voltage output from the bottom secon dary winding of the power transformer to DC voltage. C7 filters the rectified DC output voltage.

7

__________

CIRCUIT THEORY

RESET

POWER ON

+5V

Q21

COLLECTOR

Ui C5PIN

U1C6PIN

U1C4PIN

-

1

H

APPROX.

350 ms

Reset Logic Circuit Theory

A “low” pulse applied to the reset interrupt input, pin 1 of the microprocessor U7D, causes the pro cessor to restart execution of the printer operating system program stored in the ROM U8D, A reset pulse occurs when the power is turned on. An external device connected to the serial bus can also generate a reset, initializing all devices connected on the bus at the same time.

A short time after the power is turned on, the 5VDC supply rises to its normal operating level, This forward biases Q21, allowing C3 to charge. When the voltage across C3 reaches 2 volts, the output of the inverter U1C pin 6 goes “low”, causing the output of the inverter U1C pin 4 to go “high”.

This “low” pulse occurs when the unit is switched on. The reset input

RES

— on the serial bus

(interface clear signal —IFC

— on the 4023 IEEE interface) forces the reset pulse by applying a “low” to the input of the inverter U1C pin 1.

__

1526 AND 4023 CIRCUIT THEORY

Vi

4MHz

R55 R56

)

4

L680

U9C

U9C

0.01 F 10

7400 7400

0

2

LJ9C

7400 oii

C34 jh14zL

114

14

-

1 lii

11

81 LJ10C

7400

74177 n!-..

17

R57 -

)___d/A

47

1.15

2.2H

flTft

+ 5V

1 MEG HZ

Clock Circuit

Crystal Yl generates the fundamental 4 MHz clock. The circuit illustrated below the crystal stabilizes and squares the signal. U1OC divides the input frequency by 4. A 1 MHz clock is output on pin of U1OC. This is the processor system clock.

9

9

CIRCUIT THEORY

Microprocessor Logic

Main control of all printer operations is overseen by the 6504 microprocessor (U7D). The 6504 microprocessor can address 8196 locations allocated to RAM, ROM, or I/O. The processor com municates with two 6532 I/O devices (U4D and U5D), a 6522 VERSATILE INTERFACE ADAPTER

(U6D>, and an BK byte ROM (U8D).

U4D is a 6532 I/O device. The printer interface and address selection are controlled by U4D.

U5D is also a 6532 I/O device. Port B outputs the signals that control activation of the print wire solenoids.

Port A signals control the following functions:

1.

Paper feed motor position hold.

2.

Carriage return motor position hold.

3.

Paper out sense.

4.

Monitors carriage position by counting timing pulses.

5.

Monitors carriage home position.

6.

Outputs error LED signal.

7.

Monitors paper advance switch.

Both 6532 I/O devices contain 128 bytes of RAM. 256 bytes of storage is used as a line buffer, and for processor scratch pad and stack operations.

U6D is a 6522 VIA. This device controls the motors. Port A signals PAO-PA3 control the head motor transistor drivers. Port A signals PA4-PA7 control the paper motor transistor drivers.

The pulse width control circuits protect the print head by controlling the length of time current passes through the print wire coils. A 555 timer limits this time to 500 microseconds.

Microprocessor Address Decoding Logic

Ui D pin ii goes “low” and U2C pin 12 goes “high” when U4D is selected by the processor. Ui D pin 6 goes “low” and U2C pin 1 2 goes “high” when U5D is selected by the processor. When the processor communicates with the 256 bytes of RAM internal to the 6532 I/O devices, the RS input on the selected goes “low” and

6532 goes “low” because the processor address output A9 is “low”. U1D pin 3

U2C pin 1 2 goes “high” when the processor selects U6D. U2C pin 1 2 goes “low” when the processor selects U8D.

;

CLOCK

I CIRCUIT

1

I RESET

I

CIRCUIT

-J

I

CIRCUITS

L___J

MICROPROCESSOR LOGIC

RESET

PULSE WIDTH

CONTROL

CIRCUIT

I

-J

0

H

7

10

1526 AND 4023 CIRCUIT THEORY

PF

Motor

M

0

T

0

R w

A

N

0

STEPPING

ORDER

0

1

2

N

3

4

MO

ON

OFF

OFF

ON

ON

]

Ml

ON

ON

M3

OFF OFF

ON OFF

ON OFF

OFF

ON

OFF ON

ON OFF__[ OFF

NOTE: DURING REVERSE

TRANSMISSION, THE

CURRENT FLOW IS

STEPPED IN REVERSE

ORDER 4, 3, 2, 1, 0.

Paper Feed Motor Circuit

The paper feed motor is a four phase stepper motor. Sequentially exciting two phases at a time causes the motor to turn in step clockwise or counter clockwise. See timing chart above. Four outputs from

U6D,PA4-PA7, activate the current amplifier transistors Qi 3-Qi 6. Current flow through the emitter collector junction of Qi 3, through phase A coil, through the emitter collector junction of Qi 7 via the center tap motor coil excites phase A of the stepper motor. This occurs when the PA4 output of U6D goes “low”, U7B pin 4 goes “high”, turning on Q13. The PAO output of U5D must also be

“high”, then U7B pin 2 is “low”, and Qi 7 is turned on. CR17 CR21 suppress CEMF developed by the stepper motor coils. This protects the current amps Q13-Q16.

*WITH NO CR 17-21

100 V

FORCE

*WITH CR 17 -21

26

26V11____

COUNTER

ELECTROMOTIVE FORCE

APPROX. 50 V

ING

THROUGH THE COIL

The stepper motor holds in position when the paper is not advancing. This occurs when a low value current passes through 2 phases, producing opposing torques holding the motor in position. Phase

A and phase D are turned on, and Qi 7 is switched off. Current flow is limited by the 470 ohm 5 watt resistor that is in parallel with Qi 7.

11

CIRCUIT THEORY

U5D

6532

PAl

PAO

2 (HMO)

PAl

3 (HMI)

U6D

6522

PA2

PA3

3

U68

4

11

068

10 g

068

U68

-I cm

Q9

+26 V

MS

SW470fl

P1 ii

13 13

‘1 21

2222

‘.4

1

CA Motor

Carriage Motor Drive Circuits

U6D outputs signals HMO-HM3 (HM stands for head motor>. Four outputs drive the four phases of the stepper motor. This circuitry is similar to the paper drive motor circuits.

Q9-Ql 2 are current amplifiers. The phase A coil is energized when Q1 0 is turned on, Current is passed through the center tap of the motor coil, through Qi 8 to the 26VDC supply. The other three phases are controlled the same way. The output PAl (CA Hold> goes “low”, and Qi 8 turns off when holding current is needed to hold the paper in position. Two opposing phases are energized creating opposing torques holding the motor in position. The holding currents from the motor coils return through R5 to the 26VDC supply.

R5 limits the current flow through the coils, CR13 through CR16 suppress the CEMF developed by the coils in the motor protecting the output transistors Q9Q1 2.

12

_____

500 iS PuI

--TP1

U5D

6532

PB?

24 (ND?)

1)68

56

1)68

P86

1)58

PBS

1)58

P84

1)58

P83

1)58

P82

1)58

P81

1)58

P80

680 Li x 8

CIRCUIT THEORY

+26 V

CR12

(24 V)’

CR9 CRBf CR31 L

Fl .11

I—

11 11

U H: :-9 g;

E° i:::E

7?

66

55

Bottom plate

88 —JWL c-

---I--

44

33

Q3

—‘r

22

Q2

11

-

Top plate

01

77iT

Print Wire Drive Circuits

U5D outputs eight signals NDO

ND7 (ND

=

Needle Drive> from parallel port B (PBO

PB7).

These signals are inverted by U5B and U6B. The output of the inverters control current amplifier transistors

Qi

Q8. A print wire (needle) is fired when an output transistor is forward biased, allowing current to flow through the coil from the 26VDC supply. CR1 CR12 suppress CEMF developed by the coils.

The inverters U5B and U6B are 7406 open collector Hex/Inverters. A one shot circuit generates +VCC for U6B and U5B for 500 microseconds when a print wire is fired. This protects the print wire coils by limiting the current through the coils. See Coil Protection Circuit and Timing on page 14.

13

_________

CIRCUIT THEORY

U6D

6522

10

C9

470 p

Reset >— i

I

CR28

R39

20krz<

Cli

I looopj

01

2

Triger reset

8

Vcc

6

TH

7

DIS cv

Lc8

OUT

U8B

555

3

GND

ii

R37 2.2 k

+5V t——

+5V

-,

R36

3.9k

R35

1k

021’

I

Q20 L

— — -

I

Reset circuit

022

R23

3.9 k

TP1

TIMING CHART

U6D-PBO

UBB-OUT

Q22COLLECTOR

TP1

U

10 ,s

.1

500s ..1

I-

L

Print Wire Coil Protection Circuits

When a print wire is fired, the output PBO on U6D goes “low”. This triggers the 555 U8B. The output pin 3 goes “high” for 500 microseconds. This turns on Q20, Q21, and Q22. The potential developed at the collector of Q20 is used as

+ VCC for the open collector Hex/Inverters U58 and U6B. R39 should be adjusted to obtain the 500 microsecond pulse.

14

0

CIRCUIT THEORY

+

Ri 2

15K

P1 PJ

NO-PAPER SENSOR SWITCH

+5V

PAPER ADVANCE SWITCH AND INDICATOR CIRCUIT

Paper Control Logic

A normally closed micro switch located behind the platen opens when paper is loaded in the printer.

When no paper is in the printer, the switch is closed causing a “low” potential to be input at U5D pin 10 (PA2).

Depressing the push button on the front of the printer causes a form feed to occur. Form feed length is software controlled. A “low” potential is applied to U5D pin 1 1 (PA3) when the push button is depressed. An LED inside the push button

case indicates

the printer is powered on. A flashing LED indicates paper out. The output U5D pin 13 goes “low”, U2D pin 2 goes “high”, and the LED turns on.

15

RiO

+5 V

P1 31

CIRCUIT THEORY

CARRIAGE POSITION SENSOR

HOME POSITION SENSOR

C

C,)

TIMING CHART

*TIMING SIGNAL

;ijijijijjjijijijijj

-k-APPROX. 1.5

ms

U1C-8 PIN

(PA6)

— — — — — —

PLACE MAGNET CURRENT

FLOW OPENING POSITION

PLATE MAGNET

CURRENT FLOW

\ OPENING POSITION

\

FOR THE NEXT

\iLNE.

*RESET SIGNAL

U1C-11 PIN

U1C-10 PIN

(PA7)

WHEN CARRIAGE HAS

RETURNED TO ITS

HOME POS1TION

(PRINT STOP SIGNAL)

PRINT START

SIGNAL FOR NEXT

LINE PRINT

Position Sensor and Home Sensor Circuit Theory

When printing, the print head moves across the paper on the carriage assembly. The carriage assembly is driven by a carriage stepper motor. As the stepper motor turns, a photo-coupler device generates

“low” pulses which are input to U1C pin 9. U1C is an inverter. U1C generates “high” active pulses which are input at U5D pin 14 (PA6), and U6D pin 40 (CAl). A subroutine in the operating system monitors the pulses generated by the photo-coupler, providing processor controlled print head posi tioning. A second photo-coupler device provides a synchronizing pulse or a start pulse when the print head is at the far left (Home> position. The output of the photo-coupler is input to U1C pin 11. The output on pin 10 is input at U5D pin 15 (PA5> and U6D pin 39 (CA2).

16

Seria’ ntertace Connector

Ii fi

4

P5/P6

Pin No

3

4

1

2

5

6

Signal

SERIAL SR

GND

SERIAL ATN

SERIAL CLK

SERIAL DATA

RES

1526 AND MPS 802 CIRCUIT THEORY

+ 5V

FG

TIMING CHART

L_

_f

RECE)PT OF MESSAGE RECE)PT OF DATA

DATA L

F

PAS H)GH(PR)NTER

\

BE)NG PREPARED)

PA5 H)GH )PRMTER READY)

Jflj[jiJ

250 ys T)MER smwr

/ r

UUUUUll L

ULFLi’LF1Th ULP

The 1526 and MPS 802 Serial Interface Circuit Theory

The serial interface has bidirectional DATA and CLOCK signals. SQR (Service Request> is a hand shake input that is not used, ATTN (Attention> is a “low” active handshake signal. The printer ac cepts data on the DATA input (pin 5 of P5 and P6> after the ATTN input (pin 3 of P5 and P6> goes

“low”. U2C pins 2 and 3 go “high”, U2C pin 4 goes “low”, U2D pin 12 goes “high”, and U2D pin 10 goes “low”. This is the DATA output which acts as an acknowledgment to the ATTN input.

When the printer becomes ready to accept data, U4D pin 13 (PA5> goes “high”, U2D pin 6 goes

“low”, U2D pin 10 goes “high”. ATTN kept “low” by the transmitting device indicates commands are being transmitted on the DATA line. When ATTN is “high”, data is being transmitted on the DATA line. Data is input on U2C pin 1 1. The output of the inverter U2C pin 10 is input at U4D pin 1 5 (PA7>.

Data is clocked into the printer at the rate specified by the signal on the CLOCK input (pin 4 of P5 and P6>. The Clock signal is inverted by U2C, then input at U4D pin 9 (PAl). An external reset will reset the processor logic inside the printer. RESET is on pin 6 of P5 and P6

17

4023 CIRCUIT THEORY

1O98765hJ1

221 20 19 18 17 16 15131

P2

The 4023 IEEE Interface Circuit Theory

All the signals on the interface are controlled by the I/O device U4D. Eight parallel b[-directional data lines (PBO-PB7) are used as the parallel data bus for the interface, DAV (Data Valid) pin 6 of P2 is a “high” active output from the transmitting device. Valid 8 bit codes are transmitted to the receiv ing device when DAV is “high”. DAC (Data Accepted> pin 8 of P2 is an output that is “low” when data is being accepted because U4D pin 10 (PA2> is “high”. RFD (Ready for Data> pin 7 of P2 goes

“low”, indicating the printer is ready to receive data when data is not being accepted (DAC is “high”), and U4D pin 7 (PA 1> is “low”. ATN pin 11 of P2 is an input. The transmitting device brings this line

“low” before the data is transmitted. EOl (End or Identify) pin 5 of P2 is an input. The transmitting device brings this line “low” when the last byte of a message is being transmitted. IFC (Interface

Clear) pin 9 of P2 is an input. An external reset signal applied to the IFC initializes all the printer pro cessor logic.

18

2.

3.

1.

4.

5.

TROUBLESHOOTING GUIDE

SYMPTOM 1: Printer does not initialize when powered up.

POSSIBLE CAUSE

Power cord is damaged.

Power switch is broken.

Fuse is blown.

Power supply is defective.

Defective logic board.

SOLUTIONS

Check that the power cord is connected properly and is in good condition.

Check and replace it if necessary.

Replace it, If it blows again, check the power supply unit and PCB.

Check for proper voltages at the P/S connector

J4.

AC Volts

26

9

Across Pins

1 and 4

2and3

Cable Color

Orange

Red

Check for shorts on PCB. See circuit theory on page 7 for proper operation of power supply circuit.

1.

2.

3.

4.

SYMPTOM 2: Printer initializes but will not print,

POSSIBLE CAUSE SOLUTIONS

Ribbon cartridge is missing or empty.

Replace ribbon.

Paper out condition is present.

Check that paper is properly inserted.

Check paper out switch and replace if necessary.

Check mechanical connection at P1 on PCB.

Bad connection between PCB and Mechanical assembly.

Data transmission is not complete.

Check serial or IEEE cable for proper connection

Check for proper data transmission from computer.

Check interface circuits on PCB. See circuit theory on pages 18 and 19.

19

TROUBLESHOOTING GUIDE (Continued)

1.

2.

3.

4.

SYMPTOM 3: Part of a printed character is missing.

POSSIBLE CAUSE

Ribbon is worn out.

Head shift lever is out of position.

Print head on flexible cable is defective,

SOLUTIONS

Replace the ribbon cartridge.

Re-set the shift lever.

Interference (NOISE) in the proximity of the printer.

Check flexible cables and wiring harness for continuity.

Check the print head by disconnecting the wire harness connector Ji from P1, With an ohmmeter set on the 200 ohm range, place one of the leads on pin 10 of Ji and the other lead on pins 1 through 8 of Ji. A resistance of 10 to 14 ohms at each pin indicates a good print head. Replace if necessary.

Place printer

(i.e., motors, in area void of external interference machinery).

1.

2.

3

SYMPTOM 4: Paper does not feed correctly.

POSSIBLE CAUSE

Physical interference proper paper feed.

with

Paper feed motor defective.

Circuit failure on PCB,

SOLUTIONS

Check for obstruction of the paper feed path paper guide, platen, tractors.

Check that the left tractor is positioned to the ex treme left and the right tractor is adjusted to the correct paper width.

Check that the paper holes align with the tractor pins correctly.

Check that the paper release lever is in the correct position

— in the direction of the arrow for tractor feed or opposite the arrow for friction feed.

1

Check that no more than the maximum allowable sheets of paper are being used.

With power off, check motor with an ohmmeter.

Set on the 200 ohm range. A good paper feed motor should need around 50 ohms between pin

14 of Ji and pins 25, 26, 27, and 28 of Ji.

Check for good mechanical and electrical connec tions to the motor and its wiring

— see wiring diagram on page 28.

Check for

+

26 VDC supply to the motor.

Check motor circuitry on PCB. See circuit theory on page 1 2 for proper cwcut operation.

20

TROUBLESHOOTING GUIDE (Continued)

1.

2.

3.

SYMPTOM 5: Improper Ribbon Feed

POSSIBLE CAUSE

Obstruction of ribbon path.

Defective ribbon cartridge.

Defective mechanics.

SOLUTIONS

Check FPC cables for proper location.

Check ribbon guide for foreign matter.

Check for proper ribbon insertion.

Check the rotation of the cartridge by manually rotating the ribbon in the direction of the arrow.

Check the ribbon drive gears for proper lubrication

(see page 5) and smooth opertion.

1.

2.

3.

SYMPTOM 6: Carriage does not move correctly.

POSSIBLE CAUSE

Physical obstruction in the path of the head carriage,

Carriage motor is defective.

Circuit failure on PCB.

SOLUTIONS

Check that dirt or foreign objects have not accumulated within the mechanism.

With power off, check the motor with an ohm meter. Place one of the leads on pin 13 of Ji and read the resistance to pins 21, 22, 23 and 24 of

Ji. A good carriage motor will read about 50 ohms.

Check for good mechanical and electrical connec tions to the motor and its wiring

— see wiring diagram on page 28.

Check for +26 VDC supply to the motor.

Check motor circuitry on PCB. See circuit theory on page 12 for proper circuit operation.

21

PCB PARTS LIST

• 1526 • MPS 802 • 4023•

C

Indicates Commodore Stocked Part Numbers

Differences noted in PARENTHESIS!

PCB Assy 1 526

PCB Assy MPS 802

PCB Assy 4023

C 314584-01

C 314584-02

C 314585-01

U2D

U4D

U5B

U5D

U6B

U6D

U7B

U7D

U8B

U8C

U8D

INTEGRATED CIRCUITS

U1C

U1D

U2C

U9C

U 1 OC

74LS14

74LS00

901521-30

901521-01

74LS14

74LS04

7406

6532

7406

6532

7406

6522 VIA

7406

74LS42

2364

(1526, MPS 802> 901 521-30

(4023> 901521-02

901 522-06

C 901458-01

901 522-06

C 901458-01

901 522-06

C 901437-01

6504 CPU

555

901522-06

C 901455-01

901 523-0 1

901521-17

ROM (1 526/MPS

ROM (4023>

7400

74177

802>C 325341-08

C 325360-03

901 522-04

901522-03

TRANSISTORS

Qi -Q8

Q9-Q1 6

2SD837

2SD946B

2SD985

Q17,Q18 2SB794

Q19 2SD946B

2SD985

Q20,21

Q22

Q23

2SA733

2SA844

2SC2308C

258705

2SA1075

DIODES

CR1,2

CR3

CR4,5

CR6

CR7,8

CR9

CR1O,i 1

CR12

CR13-20 sub: sub: sub: sub:

Power 1N4002

Zener RD24F, 24V, 1W, 10%

Power 1N4002

Zener RD24F, 24V, 1W, 10%

Power lN4002

Zener RD24F, 24V, 1W, 10%

Power lN4002

Zener RD24F, 24V, 1W, lOqo

Power >N400

DIODES (Continued)

CR21 ,22

CR23

CR24

CR25

CR26

CR27

CR28

Zener RD24F, 24V, 1W, 10%

Zener HZ27-2 .5W

Switching 1S2076

Zener HZ4B-2 .5W

Stack KBPO2 Sub: S2VB iSA

Stack KBLO2 Sub: S4VB 4A

Switching 1S2076

RESISTORS

All values are in ohms- 1/4 W

5% unless noted otherwise.

Ri

R2

R3

R4

R5,6

R7

R8

R9

R10,1 1

R12

R13

Ri 4-19

R20

R2 1

R22

R23

R24,25

150

47K

15K

I OK

680

3.9K

100

10K

3.9K

10K

3.9K

10K

470, 5W 10%

820

10K

3.9K

680

R26

R27-35

R36

R37

R38

R39

R48

R54

R55,56

R57

R61-64

CAPACITORS

Ci

C2

C3

C4-6

C7

CS

C9

ClO

Cli

C19-25

C26

C27

C28

C29

C30

Electrolytic 1 00,uF,

Electrolytic 1 Oj+,

Electrolytic F,

Ceramic

Ceramic

Ceramic

Ceramic

Ceramic

.0i,uF,

470pF,

.i,uF,

1 000pF,

Ceramic

Electrolytic 4700F,

Ceramic

Ceramic

.iuF,

Electrolytic 330

Film

50V

12V l6V

50V

12V

16V boy

35V

35V

16V

12V

Soy

Soy

Soy

12V

2K

1K

3.9K

2.2K

22K

Variable

20K,

EMV-K4G

1K (4023 only>

470

680

47

1K (1526,

MPS802 only>

22

PCB PARTS LIST

• 1526

• MPS 802

4023

• (Continued)

C

Indicates Commodore Stocked Part Numbers

CAPACITORS (Continued)

C32

C33-34

C35

C36-37

Ceramic

Ceramic

Ceramic

Ceramic

200pF, 50V

.047jF, 50V

01F, 50V

470pF, 50V

MISCELLANEOUS

Ferrite Beads

1526/MPS8O2

Li

L3-6

Li 5-17

4023

Li, 2

L4-14

Li 5-17

Yi Crystal 4 MHz, HC18V

MISCELLANEOUS (Continued)

P1

P2

P3

P4

P6,P7

28 Pin Connector

IEEE-48 Rt, Angle Connector

3 Pin Keyed Header

4 Pin Connector

6 Pin DIN Connector

C 903206-01

(4023)

C 903361-01

(1 526/MPS8O2)

VR1 Regulator 7805

Shield Box

Shield Cap

C 4022048-01

C 4022047-01

23

1526

• MPS8O2 ROM UPGRADES

The PCB for these printers was designed to accommodate a 24 pin ROM or 28 pin EPROM at location

U8D. A jumper change at J1-J4 will configure the board for either l.C. When changing chips at this location, match the jumpers to the type of l.C.

CLOSED Ji

OPEN J3

*

J2 CLOSED

J4 OPEN

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J4 CLOSED

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25

ADJUSTMENTS

Head Shift Lever

The head shift lever controls the position of the print head in relation to the platen. With the lever in its lowest position, towards the front of the printer, the print head is positioned as far as possible from the platen With the lever in its highest position, towards the back of the printer, the print head is positioned as close as possible to the platen.

Print Head

Set the head shift lever in its lowest position on the right side frame. Position the print head so that the clearance between it and the platen is 0.5

mm ± 0.05 mm. Tighten all screws and nuts and recheck the distance between the print head and platen. Re-adjust if necessary.

CARRIAGE

With the head shift lever in its highest position the gap should be reduced to about 0.4 mm,

26

ADJUSTMENTS (Continued)

Home Sensor

To adjust the print start position, loosen the mounting screw for the home sensor. Slide it to the left or right, so that the center of the dot farthest to the left is 32 ± 1 mm away from the inside left frame when printing standard characters. Tighten mounting screw.

32±1MM o o o

0

0

0

SIDE FRAME

HOME SENSOR

ADJUSTING SCREW FOR THE

MOUNTING POSITION OF THE

HOME SENSOR.

HOME POSITION SENSOR

Using the self-test, check for the position of the leftmost dot. If alternating lines are not within

0.32 mm of each other, re-adjust the home sensor.

0.32

OR

LESS

H

H

WITHIN 0.32

27

WIRING DIAGRAM

TO CONNECTOR P1

ON MAIN LOGIC BOARD

•• —YELLOW-

HOME

SENSOR

7

4

8

19

12

24

23

22

21

18

4

15

7

28

27

5

6

2

26

25

16

13

PAPER OUT

MICRO SWITCH

4

2

5

7

6

8

POSITION SENSOR

A

8LUE

RED

— a

R

B

W

R

G

G

G

PAPER FEED

MOTOR

CARRIAGE

MOTOR

28

MECHANICAL DISASSEMBLY

U hips h screws used in the printer mechan

1. To remove the ribbon cartridge:

1

.

1 Position the right side tractor assembly to the far right.

1 .2

Lift the ribbon cartridge from the printer.

2. To remove the top case and printer mechanism:

2.1

Remove the manual paper feed knob by firmly pulling it from the shaft.

2.2

Stand the unit up, as shown, and remove the 4 case screws at the cor ners. If the 2 center shipping bolts are still in place, remove them.

2.3

Using both hands, support the top case while lifting it up and towards the back of the unit.

2.4

With the top case tilted toward the back, lift the switch connector from the

PCB.

2.5

Remove the heat shield to expose the

PCB,

2.3

29

MECHANICAL DISASSEMBLY (Continued)

2.6

Detach the wiring harness connector from P1 on the P08.

2.7

Loosen the 3 large phillips head screws at the front of the mechanism. Sliding the mechanism towards the front, lift it from the bottom case.

3. To remove the print head and ribbon guide:

3. 1 Set the head release lever to its lowest position on the side frame.

3.2

Remove the 2 head screws.

3.3

By gently pulling, detach the FPC cable from its connector.

3,4 Lift the print head from the carriage.

3.5

Remove the ribbon guide screw.

3.6

Lift the ribbon guide and head insula tion sheet from the carriage.

4. To remove the paper detection switch:

4.1

Remove the switch bracket screw.

42 De-solder the micro switch wires from the wiring harness P08. (See wiring diagram on page 28).

4.3

To detach the switch bracket, remove the screw from the micro switch.

4.2

4.1

4,3

2.7

2.7

2

30

MECHANICAL DISASSEMBLY (Continued)

5. To remove the home position sensor:

5.1

Remove the sensor PCB screw.

5.2

De-solder the wire connections from the wiring harness PCB. (See wiring diagram on page 28).

5,3 Slide the sensor PCB toward the front of the mechanism, pulling it from its bracket. Turn it sideways to fit between the carriage pillars.

6. To remove the paper feed motor assembly:

6.1

Remove the 3 motor bracket screws from the right side frame assembly.

6.2

De-solder the wire connections from the wiring harness PCB. (See wiring diagram on page 28).

7. To remove the carriage position sensor and carriage motor:

7,1 Remove the sensor PCB screw and de solder the wire connections from the wiring harness PCB.

(See wiring diagram on page 28).

HEAD

CARRIAGE

MOTOR

7,2 Remove the carriage motor screw as in dicated. Detach the carriage motor and its holder by carefully bending the bracket legs to release them from the base.

7.3

De-solder the motor wires from the wir ing harness PCB. (See wiring harness on page 28).

POSTION

SENSOR

7.2

REMOVE

SCREW

6.1

1

31

MECHANICAL DISASSEMBLY (Continued)

8. To remove printer drive belt:

8. 1 Position the carriage at the center of the unit to allow access through the base to the belt holder screw. Remove the screw and bracket.

8.2

Remove the “F” clip to release the belt gear assembly on the right.

8.3

The drive belt will be released from the gear assembly on the left and can be removed

9.

To remove the sprocket frames and tractor assembly:

9.1

The left sprocket frame is detached by removing the

2 frame screws.

9.2

To remove the right sprocket frame assembly, remove the 2 frame screws.

9.3

Remove the “F” clips to release the tractor assem bly from the sprocket frames.

9.3

9.1

92

MECHANICAL DISASSEMBLY (Continued)

10. To remove the platen cover:

10.1 Remove the 2 cover screws, as indicated. Lift the cover off of the platen.

1

V

cN ‘d

11. To remove the platen and reduction gears:

11.1

Remove the “E” clip and pull the reduction gear off of the frame.

11 2 Remove the spring pin from the platen gear by tapping it with a punch.

Withdraw the gear from the platen shaft.

11 .3

Remove the platen washer and shaft supporter that are now exposed.

7— 10.1

11 1

11.2

113 113

33

MECHANICAL DISASSEMBLY (Continued)

12. To remove the paper roller assembly:

12.1

12.1

Remove the 2 paper holding springs from the right and left frames.

1

1 2.2

Remove the left “E” clip and pull the paper roller axle to enable it to slide over the frame pins.

13. To remove the front carriage guide:

13.1

The front guide pillar is removed by loosening the hex nuts at each end. Next, slide the pillar from its slots in the right and left frame plates.

13.1

14. To remove the head shaft lever and right side frame plate:

1 4.1

Remove the hex nut at the right end of the carriage pillar. Pull the lever from the shaft.

14.2

Remove the right side roller plate spring from behind the paper guide.

1 4.3

Remove the remaining screws in the frame plate. The frame must slide back, out of the base, to be re moved.

PLATE

12.1

141

1

34

MECHANICAL DISASSEMBLY (Continued)

15. To remove the FPC cable assembly:

151 Remove the cable assembly screws.

1 52 Lift the FPC cable bracket from the carriage.

16. To remove the carriage and guide pillar:

16.1

Remove the “E” clip from the pillar.

16.2

Gently pry the plastic sup porter from the shaft.

16.3

Slide the pillar to the right to release it from the frame.

16,1 A%

16.2

17. To remove the paper roller assembly:

171 Remove the release lever screw and the lever assembly.

1 7.2

Release the left side roller plate spring from the frame plate.

1 7.3

Slide the roller plate to the right to release it from the frame for removal.

17.1

17.1

—“

15.1—?

5.1

15.2

MECHANICAL DISASSEMBLY (Continued)

18. To remove the platen and paper guide:

18.1

Remove the 11 clip shaft.

from the platen

1 8.2

Pull the platen washer and shaft sup porter from the platen shaft.

18.3

Slide the platen to the right to clear the side frame,

1 8.4

Remove the paper guide screw from the side frame. Slide the paper guide to the right to clear the frame.

18.1

18.2

19. To remove the gear plate assembly and left side frame:

19.1

Remove the 2 plate screws from the assembly.

19.2

Remove the “E” chip from each gear and lift the assembly from the frame.

19.1

19.3

Remove the remaining left frame screw and slide the frame to release it from the base.

ASSEMBLY NOTES

To reassemble the printer mechanism, reverse the oraer of disassembly and follow these precautions:

The print head must be insulated from the carriage assembly. Check it with an ohmmeter.

Lubricate all gears and springs as instructed on page 5.

Secure all screws with a self-locking liquid

Make adjustments, as required, per the procedure on pages 26 and 27

3$

CASEWORK

MECHANICAL ASSEMBLIES

Section 1 Casework/Power Supply

REF. NO.

1-1 C 31458001 1526!802’4023 SOUNDPROOF COVER

C 31458101

1-2 C 31458102

C 31458103

1 526 TOP CASE

MPS 802 TOP CASE

4023 TOP CASE

1-3 C 31458201 1 526/802/4023 PLATE ASSY

1 -Plate w/Paper Advance Switch

2-Lamp, PCB and Harness

C 31458301

1-4 C 31458302

C 31458303

1526 BOTTOM CASE W/PWR/SUP ASSY

1-Plastic Case, Ground Plate and Cover

2-Power Supply Assy

MPS 802 BOTTOM CASE W/PWR/SUP

ASSY

1-Plastic Case, Ground Plate and Cover

2-Power Supply Assy

4023 BOTTOM CASE W/PWR/SUP ASSY

1-Plastic Case, Ground Plate and Cover

2-Power Supply Assy

1-5 C 314600-01 1526/802/4023 PAPER FEED KNOB

37

SECTION 2.

Mechanical Assemblies

2-1

2-3

2-5

2-6

2-8

C 31458601

2-2 C 31458701

C 31458801

2-4 C 31458901

C 31459001

C 31459101

2-7 C 31459201

C 31459301

2-9 C 31459401

2-10 C 31459501

C 31459601

REF NO.

1526/802/4023 PRINT HEAD ASSY

1-Print Head

2-Flexible Cable

1526/802/4023 CARRIAGE ASSY

1 -Carriage w/Guide

2-Carrier Guide Pillar

3-Head Adjust Lever

1526/802/4023 PLATEN ASSEMBLY

1-Platen w/Upper Cover

2-Paper Guide

3-Roller Plate w/Release Arm and Button

4-Pressure Roller Unit

1526/802/4023 TRACTOR ASSEMBLY

1-Paper Holders L&Rt

2-Pin Feed Rollers (2)

3-Tractor Shaft

1526/802/4023 GROUND PLATE ASSEMBLY

1-Bottom Ground Plate

2-Side Ground Plates (2)

3-Sprocket Frame Left

4-PCB w/Harness and Flexible Cable

1526/802/4023 GEAR REPLACEMENT KIT

1-All Plastic Gear Parts

1526/802/4023 SENSOR ASSEMBLY

1-Home Position Sensor w/PCB

2-Carriage Position Sensor w/PCB

3-Paper-Out Microswitch

1526/802/4023 HEAD MOTOR ASSEMBLY

1-Motor w/Holder

2-Rotation Detector

1526/802/4023 LINEFEED MOTOR

1526/802/4023 CARRIAGE DRIVE BELT

1526/802/4023 HARDWARE KIT

1 -Miscellaneous Screws, Washers and Nuts

2-Miscellaneous Springs and “E” Clips

3-Miscellaneous Plastic and Rubber Pieces

SECTION 2 MECHANICAL ASSEMBLIES

38

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