Apple LaserWriter Pro 16/600 PS Envelope Feeder User`s guide

K Service Source
LaserWriter 16/600 PS
LaserWriter 16/600 PS
K Service Source
Basics
LaserWriter 16/600 PS
Basics
Read Me First - 1
Read Me First
The LaserWriter 16/600 PS has the same form factor as
the LaserWriter Pro 600/630, though some functions and
parts are entirely different. If you want a detailed
description of the new servicing issues presented by this
printer, go to the document “New Servicing Issues” that is
included on this CD. Below is a brief outline of this
document.
New rear housing layout
– I/O controller easier to access
– D/C controller harder to access
– New I/O connectivity procedures
– Fax card option
– Internal hard drive option
Basics
Read Me First - 2
Faster engine
– Modules not backward-compatible
– Feeders not backward-compatible
– Two new fans for ventilation
– Slightly louder (52 dB vs. 49 dB printing)
New printer utilities
Advanced multi-platform performance
New printer diagnostic
Basics
Printer Utilities - 3
Printer Utilities
The printer utility that you use depends on the type of
computer you use. This topic briefly describes the various
utilities. Refer to chapters 3 and 4 of the user’s guide for
complete information
Note: Settings made with any of these printer utilities
become default parameters and affect all printed documents,
regardless of the computer that originated the print request.
Basics
Printer Utilities - 4
Apple Printer Utility for Macintosh Computers
The Apple Printer Utility for Macintosh computers works
only with the LaserWriter 16/600 PS. You use this utility
to set parameters that reside on the printer’s I/O controller
board. You can use this utility to perform many functions,
some of which are listed below.
– Naming the printer
– Initializing SCSI hard drives
– Downloading fonts
– Setting default printer resolution
– Setting default paper-handling options
– Setting default print density
– Printing configuration page
– Turning off the startup test page
– Setting communication protocols
Note: The LaserWriter Utility for Macintosh computers
Basics
Printer Utilities - 5
does not work with the LaserWriter 16/600 PS.
The Apple Printer Utility has a hierarchical interface that
is completely different than the LaserWriter Utility for the
Macintosh that serves other laser printers.
After you launch the Apple Printer Utility and select a
printer, a window opens that shows four headings. These
headings are like folders in the Finder. If you click an
arrow, the folder expands to show more items. The command
“Print Configuration Page” is located in the File menu in
the menu bar.
Basics
Printer Utilities - 6
LaserWriter Utility for Windows
The LaserWriter Utility for Windows has the same functions
as the Apple Printer Utility for Macintosh computers,
except for certain hard drive and font functions which are
absent from the Windows printer drive interface.
NetWare Utilities
There are two DOS utilities, LWPMAN and LWFORM, that
perform a subset of Apple Printer Utility functions in a
NetWare environment.
TCP/IP Printer Configuration Utility for UNIX
To configure the printer from a UNIX environment, run the
TCP/IP Printer Configuration Utility by using the Telnet
program.
Basics
Paper Path - 7
Paper Path
*
Optional
Envelope
Feeder (75)
Multipurpose
Tray (100)
Standard
Cassette (250)
Optional Sheet
Feeder (500)
There are four paper
sources and one output tray
in a complete system. The
number in parenthesis is
the capacity of the paper
source.
Note: The asterisk at the
point where the paper paths
meet denotes a synchronization pause. See PS602
in “Sensing System Theory”
in this chapter.
Basics
Mechanical Drive Theory - 8
M4
M1
M2
M3
Mechanical Drive
Theory
There are four motors and
four separate drive trains in
a complete system. Two are
in the printer engine and one
is in each of the optional
feeders.
• M1 Main Motor
• M2 Pickup Block Motor
• M3 Sheet Feeder Motor
• M4 Envelope Feeder
Motor
Basics
Mechanical Drive Theory - 9
M1 Main Motor Drive
Power
Supply
DC Controller Board
A
The main motor powers the
system that transports
paper from the toner
cartridge to the delivery
tray on top of the printer.
Connecting Cable
Main Motor
Drive Assembly
B
C
Toner Cartridge
D
Fuser Assembly
Gears/Rollers
F
Transfer Roller
E
Delivery Roller Assy
Gears/Belt/Rollers
G
Note: The letters next to the
boxes correspond to the
labels in the mechanical
drive animations that are
available on the CD.
Basics
Power
Supply
Mechanical Drive Theory - 10
DC Controller Board
A
Connecting Cable
Pickup Controller Board
Pickup Sensor Board
Pickup Block Motor
Pickup
Solenoids
Gear/Roller System
H
J
K
M2 Pickup Block
Motor Drive
The pickup block motor
powers the system that
transports paper into the
engine, through the pickup
block, and up to the toner
cartridge.
Note: The DC controller
board does not connect
directly to the pickup block
motor. Make sure to
troubleshoot the three
intermediate blocks if there
is a failure in pickup block
drive. Ê
Basics
Power
Supply
Mechanical Drive Theory - 11
DC Controller Board
A
Connecting Cable
Pickup Controller Board
ENGINE
SHEET FEEDER
Connecting Cable
Controller Block
L
Feeder Controller Board
M
Sheet Feeder Motor
Pickup
Solenoid
H
Gear/Roller System
N
M3 Sheet Feeder
Motor Drive
The sheet feeder motor
powers the system that
transports paper from the
500-sheet cassette upward
into the printer engine.
Note: Once the paper
reaches the lower feed
roller in the pickup block,
engine components supply
mechanical drive.
Basics
Power
Supply
Mechanical Drive Theory - 12
DC Controller Board
A
Connecting Cable
ENGINE
ENV FEEDER
Pickup Controller Board
H
Connecting Cable
O
Connecting Cable
Feeder Controller Board
Envelope Feeder Motor
Pickup
Rollers
Drive Assembly
Primary Feed Roller
Separation Drive Assy
P
Q
M4 Envelope Feeder
Motor Drive
The envelope feeder motor
powers the system that
separates envelopes and
feeds them into the printer
engine.
Note: Once an envelope
reaches the upper feed
rollers in the pickup block,
engine components supply
mechanical drive.
Basics
Sensing System Theory - 13
Sensing System Theory
There are six paper sensors, one dual-purpose sensor, and
seven sensing switches in a LaserWriter 16/600 PS
system:
Paper Sensors
– PS601: Cassette Paper Sensor
– PS602: Registration Paper Sensor
– PS701: Multipurpose Paper-End Sensor
– PS702: Multipurpose Paper-Present Sensor
– PS851: Sheet Feeder Paper-Present Sensor
– PS931: Envelope Paper-Present Sensor
– PS201: Delivery/Interlock Sensor
Sensing Switches
– SW601: Top Cover Interlock Switch
– SW603: Upper Cassette Size Sensing Switch
Basics
Sensing System Theory - 14
–
–
–
–
–
•SW604:
•SW605:
•SW851:
•SW852:
•SW853:
Upper Cassette Size
Upper Cassette Size
Lower Cassette Size
Lower Cassette Size
Lower Cassette Size
Sensing
Sensing
Sensing
Sensing
Sensing
Switch
Switch
Switch
Switch
Switch
Basics
Sensing System Theory - 15
Actuator
Photointerrupter
OPEN
CLOSED
Paper Sensors
Paper sensors consist of an
actuator, a U-shaped photo
interrupter, and circuitry.
Sensors are tripped as the
actuator swings against
movement of paper and
blocks the gap of the U. An
actuator can be passive
(governed by gravity) or
spring-loaded.
Note: Sensor failure can be
either mechanical or
electrical. When
troubleshooting sensors,
first confirm that the arm
Basics
Sensing System Theory - 16
or lever moves freely without snagging, that any springs are
applying correct resistance, and that the actuator is not
broken. Then check that all cable connections are secure. If
you have eliminated mechanical issues, proceed with
electrical troubleshooting.
Basics
Sensing System Theory - 17
PS601
Cassette Paper Sensor
Sensor
Holder
Assembly
PS601
Paper
Pickup Block
Actuator: A passive lever in
the sensor holder assembly
is tripped by insertion of a
loaded cassette tray.
Basics
Sensing System Theory - 18
PS602
Registration Paper Sensor
Sensor
Holder
Assembly
PS602
Paper
Pickup Block
Actuator: A spring-loaded
lever in the sensor holder
assembly is tripped by
arriving paper.
All paper stops at PS602
and waits for proper
synchronization with drum
rotation and mechanical
drive.
Note: If paper does not
reach sensor PS602 within
the prescribed time after
the pickup signal is issued, a
Basics
Sensing System Theory - 19
pickup unit delay jam exists and the controller stops
printing.
If paper reaches the sensor but does not clear it within the
correct time, a pickup unit stationary jam exists. The time
allowed for paper to clear is a function of paper size, which
is detected by PS701 (for manually fed paper) and by
sensing switches (for cassette-fed paper).
Basics
Sensing System Theory - 20
PS702
Multipurpose PaperPresent Sensor
Pickup
Sensor
Board
PS702
Paper
Pickup Block
Actuator: A spring-loaded
lever in the paper pickup
block is tripped by the
leading edge of paper as it is
loaded in the multipurpose
tray.
Basics
Sensing System Theory - 21
PS701
Multipurpose Paper-End
Sensor
Pickup
Sensor
Board
PS701
Paper
Pickup Block
Actuator: A passive lever in
the paper pickup block is
tripped by the trailing edge
of paper leaving the
multipurpose tray.
Sensor PS701 detects the
size of paper fed from the
multipurpose tray.
Basics
Sensing System Theory - 22
PS201
Delivery/Interlock Sensor
Delivery/Interlock Sensor
Actuator: A plastic tab on
the fuser door and a sensing
lever in the fuser assembly
act independently to trip a
photo interrupter.
PS201 detects two things:
paper exiting the fuser and
closure of the fuser door.
Note: If paper does not
reach sensor PS201 within
5.2 seconds after it reached
registration sensor J602, a
delivery unit delay jam
Basics
Sensing System Theory - 23
exists and the controller stops printing.
If paper reaches the sensor but does not clear it within the
correct time, a delivery unit stationary jam exists. The
time allowed for paper to clear is a function of paper size,
which is detected by PS701 (for manually fed paper) and by
sensing switches (for cassette-fed paper).
Basics
Sensing System Theory - 24
PS851
Sheet Feeder PaperPresent Sensor
Actuator: A passive lever in
the controller block is
tripped by insertion of a
loaded cassette tray.
PS851
Controller
Block
Basics
Sensing System Theory - 25
PS931
Envelope Feeder PaperPresent Sensor
Actuator: A spring-loaded
lever is tripped by
placement of envelopes into
the feeder.
Basics
Sensing System Theory - 26
Circuit Board
Leaf Spring
Microswitch
Actuator
Microswitch ON
Microswitch OFF
Sensing Switches
Sensing switches attach to a
circuit board and do not use
photo interrupters.
Switches are actuated by leaf
springs that press inward as
you insert a cassette tray or
close the top cover.
Failure in sensing switches
can be either mechanical or
electrical. When
troubleshooting switches,
first confirm that the
actuator has not broken off
and then confirm that the
leaf springs are not bent or
Basics
Sensing System Theory - 27
misshapen. You should be able to press the leaf spring with
your finger and hear the clicking of the microswitch.
If you have eliminated mechanical issues, proceed with
electrical troubleshooting.
Basics
Sensing System Theory - 28
SW601
Top Cover Interlock Switch
Actuator: A tab on the top
cover actuates a leaf spring
and pin, which press the
microswitch on the pickup
controller board. See
“Troubleshooting Tips” in
Troubleshooting for
information on defeating the
top cover interlock switch.
Cover Interlock Arm
Cover Interlock Spring
Cover Interlock Actuator
SW601
Pickup
Controller
Board
Paper
Pickup Block
Basics
Cassette
(None)
Legal
Letter
A4
Executive
B5
Sensing System Theory - 29
SW603 SW604
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
SW605
SW603/4/5
OFF
ON
OFF
OFF
ON
ON
OFF
ON
ON
Paper
Pickup Block
Cassette Size Sensing
Switches (Upper)
Pickup
Controller
Board
SW603
SW604
SW605
Actuator: Plastic tabs on the
side of the cassette trays
actuate leaf springs, which
press microswitches on the
pickup controller board.
The tab/switch configurations are as shown.
Note: See the next page for a
note regarding the 250sheet universal cassette.
Basics
Sensing System Theory - 30
SW851/2/3
Cassette Size Sensing
Switches (Lower)
Sheet Feeder
Controller Board
SW851
SW852
SW853
Actuator: Plastic tabs on the
side of a cassette tray
actuate leaf springs, which
press microswitches on the
sheet feeder controller
board.
Note: The sheet feeder uses
a 500-sheet universal
cassette. As with the upper
250-sheet universal
cassette, the tabs are set
manually by adjusting a
selection dial on the cassette.
Basics
Sensing System Theory - 31
When you are troubleshooting, be aware that human error
can be a factor in paper-size sensing for these universal
cassettes.
Basics
Test/Configuration Pages - 32
Test/Configuration Pages
There are three special pages that an operational
LaserWriter 16/600 PS can print. Each indicates
information that can isolate problems and/or identify the
configuration of the printer.
Startup Test Page
The printer generates a startup test page 2-3 minutes after
you switch on the printer. Successful printing of this page
indicates that the I/O board is operational.
Note: The startup test page may not print due to
software disabling (see “Printer Utilities” in Basics).
Basics
Test/Configuration Pages - 33
Service Test Page
The printer generates a service test page when you press the
service test page button. Successful printing of this page
indicates that the printer engine is operational.
Configuration Page
The printer generates a configuration page when you issue
the “Print Configuration Page” command with the printer
utility.
Note: The “Print Configuration Page” command in the
Apple Printer Utility is located in the File menu.
Basics
Test/Configuration Pages - 34
Ê
Startup
Test Page
Printer Names
Communication parameters and
printer control language selected
for an individual printer port
ROM
version
Installed RAM
Printer Resolution
Number of pages
the I/O board has
produced
Other startup icons
FinePrint enabled
PhotoGrade enabled
Hard drive on-line
Optional feeders
installed
Basics
Test/Configuration Pages - 35
Service Test Page
To access the service test
page button, open the
multipurpose tray. The
button is located in the
upper right corner of the
opening. The button is small
and difficult to see against
the black plastic. Use a
paper clip or similar tool to
press the button.
Basics
Test/Configuration Pages - 36
The service test page pattern
is a series of vertical lines
that cover the imageable
area of the page.
Basics
Test/Configuration Pages - 37
Configuration Page
This page provides the
following information to the
service technician.
• Network address settings
(1)
• Amount and allocation of
RAM memory and readout
of EEPROM integrity (2)
• Switch configurations
(3)
• HP LaserJet® emulator
version (4)
• Startup page setting (on
or off) (5)
• LaserWriter serial
number (6)
Basics
Test/Configuration Pages - 38
•
•
•
•
•
Halftone screen settings (7)
System administrator password (8)
Timeout settings (9)
SCSI ID of printer and attached drives (10)
Default paper tray and margin offsets (11)
If possible, always print a configuration page before calling
Apple Technical Assistance Center.
Basics
Configuration Switch - 39
Configuration
Switch
Configuration
Switch
Communication
Ports
The configuration switch is
located at the top of the I/O
controller board end
bracket. Configuration
refers to the communication
protocols that you assign to
each of the three ports.
When you set communication
protocols on older
LaserWriter printers, you
typically set a configuration
switch that has numerical
settings similar to a SCSI ID
switch. The number you
Basics
Configuration Switch - 40
choose corresponds to one of ten codes in a predefined
configuration matrix.
With the LaserWriter 16/600 PS, the configuration switch
is a toggle between standard (down) and custom (up) values.
You define custom settings through software (see “Printer
Utilities” in Basics). This scheme allows users greater
flexibility in establishing configuration.
Basics
LaserWriter Safety - 41
LaserWriter Safety
Unplug Printer
LaserWriter printers operate at high voltages. To prevent
serious injury, always switch off the printer and unplug the
AC power cord before servicing the printer.
Laser Beam Safety
Never disconnect the beam-detect cabling or laser shutter
when the printer is switched on. Also be careful not to place
screwdrivers or other shiny objects in the path of the laser
beam. The reflected laser beam, though invisible, can
permanently damage your eyes.
Never remove the cover of a laser/scanner assembly,
whether the printer is powered on or not.
Basics
LaserWriter Safety - 42
Fuser Heat
The fuser assembly rollers become very hot during printer
operation. Before servicing the fuser assembly, switch off
the printer for at least 5 minutes to allow the fuser
assembly roller to cool.
Toner Safety
Toner is a nontoxic substance composed of plastic, iron, and
a small amount of pigment. Clean skin and clothing by
removing as much toner as possible with a dry tissue, then
washing with cold water. Hot water causes toner to jell and
permanently fuse into clothing. Toner attacks vinyl
materials, so avoid contact with vinyl.
Weight
LaserWriter printers are heavy. When lifting or moving
the printer, be careful not to strain your back.
K Service Source
Specifications
LaserWriter 16/600 PS
Specifications
Engine - 1
Engine
Engine
Canon LBP-P430 engine
Printing Method
Electrophotography using single-component microfine toner
Optical System
Semiconductor laser and a rotating six-faced prism scanning
mirror
Resolution
600 dpi
Specifications
Dimensions
Engine - 2
Height: 12.08 in. (307 mm)
Width: 16.73 in. (425 mm)
Depth: 16.89 in. (429 mm)
Clearance Required
50.4” x 24.25” x 19.75” high (1282 x 616 x 501 mm)
Weight
Printer with cassette: 42.02 lb. (19.1 kg):
Toner cartridge: 3.3 lb. (1.5 kg)
Operating
Environment
Temperature: 50-90.5° F (10-32.5° C)
Humidity: 20-80% relative humidity
Atmospheric Pressure: 570-760 mmHg
Specifications
Power Consumption
Noise Level
Engine - 3
Approximately 0.79 kW at 71° F (20° C)
Sound Power Level:
66 dB or less (printing)
47 dB or less (standby)
Sound Pressure Level (Bystander Position)
52 dB or less (printing)
34 dB or less (standby)
Printing Speed
17.1 pages per minute (letter)
16.2 pages per minute (A4)
Duty Cycle
No limit in pages per month
Specifications
Consumables
Service Life
Macintosh
Requirement
Engine - 4
Pickup Rollers: 200,000 pages
Separation Pad: 200,000 pages
Fuser Assembly: 200,000 pages
Transfer Roller: 200,000 pages
Power Supply Fan: 25,000 hours
Controller Board Fan 25,000 hours
Front Fan 10,000 hours
Replace the multipurpose pickup roller and separation pad
together. The separation pad is contained in the multipurpose
tray guide assembly.
System Software 7.0 or later
Specifications
Printable Area (in
inches)
Engine - 5
US Letter: 8.11 by 10.79
US Legal: 8.11 by 13.79
A4: 7.89 by 11.44
B5: 6.72 by 9.81
Specifications
I/O Board - 6
I/O Board
CPU
AMD 29030 (RISC) running at 25 MHz
RAM
8 MB, expandable to 32 MB.
Refer to “Upgrading RAM” in Upgrades for more information.
ROM
4 MB standard
ROM may be either soldered or in the form of SIMMs. If you are
returning an I/O controller board to Apple that uses ROM
SIMMs, those SIMMs must accompany the board. Replacement
I/O controller boards that do not have soldered ROM will have
separately-bagged ROM SIMMs that you will need to install
onto the board.
Specifications
Pinouts
Settings
Imaging Languages
Supported
I/O Board - 7
LocalTalk, Ethernet, and parallel connections
The LaserWriter 16/600 PS features automatic traffic control.
The printer can accept jobs simultaneously from AppleTalk,
TCP/IP, and NetWare networks and from the parallel port,
automatically switching between PostScript and PCL5
languages. No manual intervention is required if the standard
communication settings are adequate. See “Configuration
Switch” in Basics for information about customizing these
settings.
QuickDraw, PostScript Level 2 (2014), and HP PCL 5
Specifications
Fax Card - 8
Fax Card
Features
When equipped with the fax card, the LaserWriter 16/600 PS
• Sends documents to any Group III-compatible fax machine or
printer from an Apple Macintosh or IBM PC compatible
computer.
• Receives and prints faxes at 200dpi from Group III-compatible
fax machines.
• Receives and prints faxes at 600dpi from other printers
equipped with PostScript fax capability.
• Send PostScript-language files to other printers that have
PostScript fax capability so that documents print at the
resolution of the receiving printer.
• Sends and receives documents at speeds up to 9600 bps.
Note: There are two fax cards available from Apple, one for use
in the United States and one for international use. The USA fax
Specifications
Fax Card - 9
card has built-in modem capability and can be connected
directly to an analog phone line. The international fax card is
designed to connect into an external modem.
Specifications
Sheet Feeder - 10
Sheet Feeder
Dimensions
Height: 5.28 in. (134 mm)
Width: 16.38 in. (416 mm)
Depth: 18.15 in. (461 mm)
Weight
13.2 lb. (6.0 kg) with cassette
Power Consumption
24 VDC supplied by printer
Specifications
Envelope Feeder - 11
Envelope Feeder
Dimensions
Height: 5.03 in. (127.8 mm)
Width: 12.04 in. (306.5 mm)
Depth: 11.53 in. (293 mm)
Weight
5.72 lb. (2.6 kg)
Power Consumption
24 VDC supplied by printer
Specifications
Paper - 12
Paper
Input Sources and
Capacities
Output Source
Paper Sizes
Standard cassette (250)
Multipurpose tray (100)
Lower cassette (500)
Envelope feeder (75)
Face-down delivery tray
Standard Cassette:
A4, B5, legal, letter, or executive plain paper (16-24 lb.)
Cassettes available: letter, A4, or universal
Multipurpose Tray
Plain paper from 7.16 in. by 10.1 in. to 8.5 in. by 14 in. (1632 lb.), envelopes, and fuser-compatible labels and film
Specifications
Paper - 13
Lower Cassette
A4, B5, legal, letter, or executive plain paper (16-24 lb.)
Cassette available: universal
Envelope Feeder
COM-10, DC, Monarch, C5, B5 (recommended envelope); from
3.54 in. by 7.44 in. to 7.0 in. by 10.0 in.
Note: Do not use envelopes with clasps, snaps, windows, or
synthetic materials. Envelopes with peel-off adhesive strips
or double sealable flaps must use fuser-compatible adhesive.
K Service Source
Troubleshooting
LaserWriter 16/600 PS
Troubleshooting
General - 1
General
Troubleshooting contains quick-reference troubleshooting
information for the LaserWriter 16/600 PS. We encourage you
to review and print out this chapter before troubleshooting a
printer.
At the end of this chapter are troubleshooting flowcharts and
tables. If a table name clearly addresses your problem, you can go
directly to that table. If not, you should go to the flowchart
associated with the version of the printer you are working on.
Troubleshooting
Power–On Self Test (POST) - 2
Power–On Self Test (POST)
When you switch on power, the LEDs are designed to illuminate in
a specific sequence as the printer comes ready. In a functioning
printer, all LEDs briefly illuminate about a second after you turn
on the printer to confirm power distribution . They then
extinguish and pulse as the fans power up and main motor rotation
takes place. About 5-6 seconds into printer startup, all LEDs will
again illuminate for one second. This marks the beginning of the
Power-On Self Test (POST).
POST is a diagnostic procedure built into the I/O controller board
that tests four areas: the SIMM/CPU, the I/O controller, the
engine, and a fax or hard drive, if present. As each checks passes,
the leftmost LED extinguishes. When all four checks have passed,
all LEDs remain extinguished for one second. The ready LED will
then flash once. The Power-On Self Test then ends, and control
passes over to the PostScript interpreter.
Troubleshooting
Power–On Self Test (POST) - 3
Note: The LED array that POST uses has no correlation to jam,
low-toner, or paper-out conditions. POST simply uses those LEDs
to relay coded feedback. Once control passes over to the PostScript
interpreter, the engine sensing system engages and LEDs do
correlate to their labels.
When POST does detect an error, it exits the LED-extinguishing
sequence and alternately flashes the toner and jam LEDs until you
turn off the printer. Observing which LEDs had extinguished
prior to the error array can help isolate the fault to one of the
four areas indicated.
POST Pass
This movie shows where
POST occurs during startup.
POST Fail
This movie shows an example
of a detected engine problem.
LED Arrays
This image shows the
normal meanings of LEDs.
Troubleshooting
Printer Diagnostic (EPOST) - 4
Printer Diagnostic (EPOST)
Whereas the Power-On Self Test (POST) occurs during every
printer startup, the Extended Power-On Self Test (EPOST) occurs
only with intervention of the service technician. EPOST is a
diagnostic built into the I/O controller board that is designed to
run when the printer is in a modified state of operation.
To enable EPOST, turn off the printer, install a serial loopback
connector into the I/O controller serial port, and set the
configuration switch to the “up” position. Turn the printer on.
EPOST startup behavior is identical to POST up to the point where
an error is detected. In POST, startup is terminated and a general
error display is reported to the LED panel. In EPOST, error
reportingis extended. Consequently, about a dozen, more specific,
error codes are able to be displayed. See next page for a chart of
failure error codes.
Troubleshooting
Printer Diagnostic (EPOST) - 5
If EPOST detects an error, the LEDs will cycle through the
following sequence until you turn off the printer. The QuickTime
movie below animates this cycle.
• All LEDs on for one second
• All LEDs off for one second
• Failure error code for two seconds
• All LEDs off for one second
Caution: When you have finished running the Extended POST
diagnostic, be sure to remove the serial loopback cable and set the
configuration switch in its original position. Any readout other
than those shown above is an unknown error that cannot be
detailed any more specifically.
Troubleshooting
Printer Diagnostic (EPOST) - 6
Ê
I/O Controller Board
Fuser Assembly
ROM SIMM A
Laser/Scanner Assembly
RAM Size
Misc. Engine (Operator or Unknown Error)
RAM SIMM (Low)
Engine Fan (1 or More)
RAM SIMM (High)
Main Motor
Engine Controller (Interface or NVRAM)
SCSI Hard Drive (Present but Failing)
Troubleshooting
Printer Diagnostic (EPOST) - 7
The LaserWriter 16/600 PS requires the mini DIN-8 serial
loopback connector that is listed as part of one of the diagnostics
kits available from Apple. This connector can also be ordered
separately as part number 922-1489.
Serial Loopback Connector
Troubleshooting
Printer Diagnostic (EPOST) - 8
For those service providers who would like to build their own
loopback connector, the plug consists of a male mini DIN-8
connector with pins 1 and 2 tied together using a piece of smallgauge wire-wrap wire. The pins on the male end of the mini DIN8 connector are numbered as shown:
678
34 5
12
Troubleshooting
Maintaining I/O Connectivity - 9
Maintaining I/O Connectivity
If you want to troubleshoot the printer while maintaining
connectivity to a host computer, you must temporarily reposition
the printer’s I/O controller board. In this reconfigured state, you
will be able to print from a paper source other than the standard
cassette, observe the behavior of LEDs during startup, or run the
printer diagnostic, while still having the engine open for
troubleshooting.
To reconfigure the I/O controller in this way, remove the rear
panel, I/O controller board, and I/O shield. Remove the printer
interface cable from the I/O controller board and temporarily
substitute a Quadra 900/950 floppy drive 20-pin cable.
Connect the free end of this long interface cable to connector J207
on the DC controller board. Reconnect the power cable to
connector J15.
Troubleshooting
Maintaining
I/O Connectivity
Maintaining I/O Connectivity - 10
Ê
J207
I/O Board
Quadra 900/950 Floppy Drive Cable
Troubleshooting
Troubleshooting Tips - 11
Troubleshooting Tips
Multimeter Probes
The connectors within the LaserWriter 16/600 PS are very
small and require sharp needle-point probes to make good contact.
Do not use probes that do not make proper contact. To see whether
a set of probes works properly, test resistance at connector J210
on the DC controller board in the manner described below (the
cable must connected to the board).
Set your multimeter to resistance and insert the probes at pins 1
and 10. If the reading indicates continuity then the probes are
making good contact. If the reading indicates infinite resistance,
then the probes do not make contact and should not be used with
this printer.
Troubleshooting
Troubleshooting Tips - 12
Forcing a Feed Cycle
If you want to print from anything other than the standard 250sheet cassette tray, you must be connected to a CPU and select the
feed option that you want. It is not possible to print a service test
page from any source other than the standard cassette.
Troubleshooting
Troubleshooting Tips - 13
Interrupting a Print Cycle
Interrupting a print cycle and inspecting the photosensitive drum
can help isolate the cause of print quality problems. If the image
on the surface of the drum exhibits the same problem as the
printed page, the fault is before the drum, probably in the
imaging system.
If the image on the drum is OK, the fault is after the drum,
probably in the fuser assembly, transfer block, or high-voltage
power supply. To inspect the drum in this way, run a print and
wait until the paper clears the synchronization pause at the
registration paper sensor. Open the toner access door, remove the
toner cartridge, and pull back the shield to inspect the drum.
Troubleshooting
Troubleshooting Tips - 14
Maintaining Pickup Connectivity
To troubleshoot the paper pickup block, you must temporarily
reconfigure the printer’s paper path so that the pickup block is
exposed. In this reconfigured state, you will be able to take
voltage readings from the pickup controller board and observe
paper feeding from the cassette.
Note: Since paper will jam due to the disruption of the paper
path, you must disable the startup test page (see “Printer
Utilities” in Basics) before turning the printer back on. Make
sure to enable the startup test page before returning the printer
to the customer.
To reconfigure the paper path, remove the pickup block, set it at
an angle to the printer, and reconnect cables J601 and J603 at the
leading edge of the pickup controller board. Insert the cassette
tray into the pickup block. Press down the top cover interlock
actuator and force the interlock switch closed by wedging in the
Troubleshooting
Troubleshooting Tips - 15
hooked end of the green cleaning brush. Reinstall the top cover and
cover liner and close the lid.
If you want to test pickup from the multipurpose tray or the
envelope feeder, you must maintain I/O connectivity (see
previous topic). You cannot run a service test page from any
source other than the standard 250-sheet cassette.
Caution: Do not let the pickup controller board brush up against
the metal chassis when performing this procedure.
Troubleshooting
Troubleshooting Tips - 16
Defeating the Top Cover Interlock
You may occasionally need to defeat the top cover interlock to
simulate a “top cover shut” condition. To defeat this sensor, open
the toner access cover and wedge a stiff, non-metallic insert into
the interlock switch opening. Push the insert down to depress the
interlock leaf spring.
Troubleshooting
Troubleshooting Tips - 17
Defeating the Fuser Door Interlock
You may occasionally need to defeat the fuser door interlock to
simulate a “fuser door shut” condition (for example if you wanted
to observe paper as it exits the fuser rollers). To defeat this
sensor, open the fuser access door and wedge the brush end of the
green cleaning brush into the delivery/interlock sensor.
Green Cleaning Brush
Troubleshooting
Troubleshooting Tips - 18
Caution: Do not insert the brush too far into the sensor. After
removing the brush, make sure that the delivery sensing arm
moves freely and is not snagged.
Troubleshooting
Troubleshooting Tips - 19
Sheet Feeder Bypass
You can visually troubleshoot a functioning stand-alone sheet
feeder by bypassing connector J603 on the printer’s pickup
controller board.
Disable the startup test page, and remove the top cover, rear
panel, and right corner panel from the printer. Disconnect J603
from the exposed edge of the pickup controller board and connect a
spare sheet feeder interface cable (P/N 922-0219). Plug the
opposite end of the interface cable into the sheet feeder receptacle.
Troubleshooting
Troubleshooting Tips - 20
Observing Envelope Feed
You can visually inspect and/or take multimeter readings from a
fully functioning envelope feeder. Remove the covers of the feeder
and install it into the printer. The feeder will operate in normal
fashion.
Envelope Feeder
(without covers)
Troubleshooting
Troubleshooting Tips - 21
Drum Exposure
Cover the toner cartridge when you remove it from the printer.
Prolonged exposure to light can result in print quality problems.
If this has occurred, store the toner cartridge in a dark place. The
drum will return to its normal condition after about 24 hours.
Troubleshooting
Capacitor Discharge - 22
Capacitor Discharge
When there is a failure of the fusing system, the DC controller
board shuts off current to the fuser roller heater and charges
capacitor C208 to prevent overheating. If there is a failure of the
fusing system, you must turn the power off for about 10 minutes
or manually discharge the capacitor before switching power back
on.
C208
DC Controller Board
Troubleshooting
Capacitor Discharge - 23
Caution: Be sure to switch off power and unplug the printer
before performing this procedure.
To discharge capacitor C208, switch off the printer and remove
the rear panel, I/O controller board, and I/O shield. Carefully
jumper the two wires at the base of the capacitor using some kind
of conductor.
Note: There are many different tools that can be used to discharge
the capacitor: a flat blade screwdriver, paper clip, or aluminum
foil doubled over. The tool illustrated is a length of lead solder. It
has the advantage of being ductile and is less apt to damage the
controller board.
Troubleshooting
Capacitor Discharge - 24
Discharging
Capacitor C208
C208
Troubleshooting
Expansion Post Connectors - 25
Expansion Post Connectors
The LaserWriter 16/600 PS has several cable receptacles that
are secured to the printer by finned post connectors. The fins
expand when you insert the connector, but once the connector is
installed it can be difficult to remove.
If you cannot remove these connectors with your fingers, try
small bent-nose pliers, a 5 mm nut driver, or grip-rings forced
around the post.
Caution: The cable receptacles are keyed. If you install them
upside-down, they will not couple properly.
Troubleshooting
Expansion Post Connectors - 26
Fin
Cross Section
Fin
Expansion Post Connector
Troubleshooting
Toner Cartridge Modification - 27
Toner Cartridge Modification
LaserWriter toner cartridge part number M2473G/A is the only
cartridge from Apple specifically designed for the LaserWriter
16/600 PS.
However, you may also use Revision B LaserWriter Pro 600/630
toner cartridges in the LaserWriter 16/600 PS. The Revision B
cartridges were introduced in late 1993 and were designed to be
forward-compatible.
Warning: You must not use the original version of the
LaserWriter Pro 600/630 toner cartridge in the LaserWriter
16/600 PS. You can distinguish the new revision B toner
cartridge by the 1” x 3.5” molded ridge on the top surface. If this
ridge is not present, do not use the toner cartridge with the
LaserWriter 16/600 PS.
Troubleshooting
Toner Cartridge
Modification
Toner Cartridge Modification - 28
Troubleshooting
Circuit Board Diagrams - 29
Circuit Board Diagrams
On the following pages are diagrams of the circuit boards and
high-voltage contacts listed below:
• I/O Controller Board
• Fax Card (Domestic)
• Fax Card (International)
• DC Controller Board
• Pickup Controller Board
• Pickup Sensor Board
• High-Voltage Power Supply
• Envelope Feeder Controller Board
• Sheet Feeder Controller Board
Troubleshooting
Circuit Board Diagrams - 30
ROM SIMM Slots (empty if soldered ROM)
RAM SIMMs
I/O Controller Board
(To Engine)
J1
Configuration Switch
Centronics Parallel
BA DC
IOP ROM
J15 Fax
Soldered ROM (not
present on all boards)
J23
Opening for Fax Port
Ethernet
LocalTalk
(To Power)
J21 Connector for Internal Hard Drive
(see “Addiing Hard Drives” in Upgradess)
SCSI
Troubleshooting
Circuit Board Diagrams - 31
Fax Card (Domestic)
Solder Side
Component Side
Speaker
Fax Card
(Domestic)
Fuse
J2
(Fax Card)
mates into
J15
(I/O Board)
Ghosted image is outline of I/O controller board.
Modem
IC
Battery
J2
Troubleshooting
Circuit Board Diagrams - 32
Fax Card (International)
Solder Side
Fax Card
(International)
J3
(Fax Card)
mates into
J15
(I/O Board)
Ghosted image is outline of I/O controller board.
Component Side
Battery
J3
Troubleshooting
Circuit Board Diagrams - 33
DC Controller Board
VR201 (see “Registration
Adjustment” in Adjustments.)
J203
C208
J206
J204 J205
J207
J208
J213
J209
J201
J211
J214
J212
J210
TB201
Troubleshooting
Service Test
Page Button
Circuit Board Diagrams - 34
Pickup Controller Board
SW602
SW601
Cover Interlock
Switch
J601
J603
J604
J604
J602
J605
Cassette Size
Microswitches
SW603
SW604
SW605
J605
Troubleshooting
Circuit Board Diagrams - 35
Pickup Sensor Board
PS702
Multipurpose Tray
Paper-Present
Sensor
J704
J703
J702
PS701
Multipurpose Tray
Paper-End
Sensor
Pickup Controller
Board Receptacle
J701
Troubleshooting
Circuit Board Diagrams - 36
High-Voltage Power Supply
PS Interface Board
Receptacle
TB406
J402
J401
TB405
VR401
TB404 TB403
TB402
TB401
Troubleshooting
Circuit Board Diagrams - 37
Envelope Feeder
Controller Board
J931
PS931
J932
Troubleshooting
Circuit Board Diagrams - 38
Sheet Feeder
Controller Board
J853
PS851
J851
J852
SW851
SW852
SW853
Tab Cutout
Cassette Size
Microswitches
Troubleshooting
Wiring Diagram - 39
Wiring Diagram
The LaserWriter 16/600 PS wiring diagram can be found on the
next page. The detail in this document is too small to read easily at
100% view. You should either zoom into the diagram using the
zoom tool above, or print the diagram on a laser printer with a
resolution of 300 dpi (600 dpi preferred).
TB405
ANTIN
TB403
TONER GND
CARTRIDGE
TB404
TRANSFER
BLOCK
3
4
1
2
HV
POWER
SUPPLY
6
LED 5
4
STATUS
PANEL 3
2
1
GND
DISP4
DISP3
DISP2
DISP1
+5V
J601
1
FM1
1 2 3 4 5 6 7 8 9 10 1112 13 14 15 16 17 18 19 20
J207
J201
1 2 3 4 5 6 7 8 9 10 1112 13
4
J603
6 7
1
J604
8
J602
4
1
1
J605
B
A 5
1
M1
1 2 3 4
J131
MAIN MOTOR
6
1 2 3 4 5 6 7
J721
3 2 J743
LASER DRIVER
PICKUP CONTROLLER BOARD
(Solder Side)
1
2
3
4
SW851
J135
F
F
M3
A
/A
B
/B
1
2
3
4
PS851
Sheet Feeder
Paper-Present
J852 Sensor
1 2 3 4 5 6
J151
SCANNER
M5
MOTOR UNIT
'H' When
Tripped
1
2
3
1 2 3
1 2 3 4
J731
BEAM DETECT
IC UNIT
'H' When Tripped
'L' When Tripped
SW602
Service Test
Page Switch
J602
A1 B1 A2 B2 A3 B3 A4 B4 A5 B5
'L' When
Tripped
F
SHEET
FEEDER
(Optional)
ENVELOPE
FEEDER
(Optional)
J931
SENSOR HOLDER
ASSEMBLY
A1 B1 A2 B2 A3 B3 A4 B4 A5 B5
F
Cassette Size
Sensing Switches
1 J853
2
3
J205
8 7 6 5 4 3 2 1
'L' When Tripped
J136
SL851
Pickup Roller
Clutch Solenoid
FM3
PS201
DELIVERY/
INTERLOCK
SENSOR
CONTROLLER BOARD
J605
1 2 3 4 5 6
1STL
GND
1STS
RESL
GND
RESS
J851
PICKUP
1 2 3 4 5 6 7 8 9 10 11 12 13
J601
'H' When Door
Is Open
SW601
1
2
J603
3
J604
4
1 2 3 4
+24VA
EBVO
EBVI
GND
SW853
FAND
FLOCK
GND
LASER/SCANNER ASSEMBLY
+24VA
2NDO
2NDI
GND
SW852
1
2
3
4
GND
SLO1
SLI1
PAP
PBP
DOPEN
+5V
+24VB
+24VB
GND
GND
+24VA
+24VA
1
FM2
J213
J206
7 6 5 4 3 2 1
EXHAUST
FANS
FAND
FLOCK
GND
J208
J203
5 4 3 2 1
EXHAUST
FAN
1 2 3 1
J209
2
J214 3
DC CONTROLLER BOARD
1
2
3 J204
4
5
J211
6 4 3 2 1
13
J136
1 2 3
J212
10 9 8 7 6 5 4 3 2 1
J210
1 2 3 4 5 6
TB201
40
J2
1 2 3 4 5 6 7 8 9 10 1112 13 14 15 16 17 18 19 20
PSNS
GND
PSL
TB401
B5
A5
B4
A4
B3
A3
B2
A2
B1
A1
J103
1 2 3 4 5 6
J13
FAND
FLOCK
GND
TR
DEV
B5
A5
B4
A4
B3
J401
A3
B2
A2
J402
B1
1 2 3
A1
J104
3 2 1
LASERWRITER
16/600 PS I/O BOARD
J15
3 2 1
1 2 3 4
PS701
PS931
Envelope Feeder
Paper-Present Sensor
A
/A
B
/B
PS702
3 2 1
J932
1
2
3
4
PB
MPS
MPE
GND
+24VA
TB402
+24VD
GND
/MON
/MRDY
GND
ANT
GND
REF
TB406
PRI
POWER SUPPLY
1
2
3
4
+5V
/BDI
GND
J742
1
2
J105 3
4
J101
/SCNRDY
/SCNON
+24VA
SCNCLK
GND
F
2 1
J102
PDS
1
PA
UP
D742
D741
GNDTH
FSRTH
+24VB
+5V
TVIN
HVRST
/TVOUT
SLI2
SL02
GND
/PA
MP
/PB
1ST
LOW
10
9
8
7
6
5
4
3
2
1
LINE
INPUT
GND
APCOUT
APCIN
/VDATA
/ENBL
/LON
+5V
H1
J744
J741
+5V
+5V
+24VA
GND
GND
GND
TH1
Main Power
Switch
SW101
/FSRD
RLD
THOUT
TP1
8
7
6
5
4
3
2
1
J743
+24VD
/TXD
+5V
/RXD
GND
8
7
6
5
4
3
2
1
GND
/BD
/PPRDY
/RDY
/VSREQ
/SBSY
/STS
/PCLK
/CBSY
/PRNT
/VSYNC
/CPRDY
GND
/CMD
/CCLK
GND
/VDO
GND
GND
GND
HIGH-VOLTAGE
CONNECTOR BOARD
FUSER ASSEMBLY
Multipurpose
Paper-End
Sensor
Multipurpose
Paper-Present
Sensor
J701
1
J702 2
3
1
2
J703
3
4
J704
M4
PS601
PS602
CASSETTE
REGISTRATION
PAPER SENSOR PAPER SENSOR
PICKUP SENSOR BOARD
1
2
SW603/4/5
Cassette Size
Sensing Switches
Multipurpose
Pickup Roller
Clutch Solenoid
+24VA
SL702
MPD
GND
PA
/PA
PB
/PB
+24VA
1STD
M2
SL701
Cassette Pickup Roller
Clutch Solenoid
Troubleshooting
Connector J136 Locator - 41
Connector J136 Locator
J136 is the connector that the envelope feeder mates into. To see
it, open the multipurpose tray and remove the closure panel. The
illustration below shows the connector as it appears from the
outside of the printer.
A voltage reading of 24V between pins 1 (+24VA) and 4 (GND)
during printer startup indicates that motor power is reaching the
envelope feeder.
3
4
1
2
Troubleshooting
Connector J743 Locator - 42
Connector J743 Locator
J743 connects the fuser assembly to the high-voltage connecting
block. A measurement of continuity between pins 1 and 8
indicates that the heater bulb and thermoprotector are intact. A
measurement of continuity between pins 6 and 7 indicates that the
thermistor is intact.
6 7
8
1
Connector J743
Fuser Assembly
Troubleshooting
Flowcharts and Tables
LaserWriter 16/600 PS Troubleshooting Flowchart
START
Connect the printer to a
known-good computer,
install a toner cartridge,
and fill the cassette tray.
Does
the power supply
fan come on when
you switch on the
printer?
No
Go to Table 1.
Yes
Does
the ready LED
glow steadily after the
printer warms
up?
No
A
Yes
Try printing from each
available paper source. If
the printer does not pick up
paper, or if the paper jams,
go to Figure 3.
Is the print
quality OK?
No
Go to Figure 2,
Print Quality
Problems.
Yes
If necessary, restore the
customer's LaserWriter
Utility settings. (For
example: Startup Page,
Automatic Tray Switching,
and Default Resolution.)
PRINTER IS FUNCTIONAL
Figure 1. LaserWriter 16/600 PS Print Engine Check (1 of 2)
Troubleshooting
Flowcharts and Tables
222 2
2
A
Are all
LEDs off?
Yes
Go to Table 2.
No
Are
the toner-out
and paper-jam LEDs
flashing?
Yes
Perform the EPOST
procedure (see the
"Printer Diagnostic"
topic).
No
Is the toner
LED on or
flashing?
Yes
Go to Table 3.
No
Is the paper-out
LED on?
Yes
Go to Table 4.
No
Is the paper-jam
LED on?
Yes
Go to Table 5.
No
If the ready LED flashes without
stopping, disconnect the printer from
the computer, and see if the problem
persists. If you have just performed
the printer diagnostic (see the
"Printer Diagnostic" topic),
confirm that the serial loopback
connector has been removed from the
serial port.
Figure 1. LaserWriter 16/600 PS Print Engine Check (2 of 2)
2 2
Troubleshooting
Flowcharts and Tables
Troubleshooting Tables
Important
As you proceed through the steps in a table, remember to retry the printer each
time you change its physical state–for example, when you replace a module. If
the problem remains, reinstall the original module before proceeding to the
next step in the table. Refer as necessary to the wiring diagram that follows the
tables.
Table 1. The Power Supply Fan Does Not Come On When You
Switch On the Printer
Step
1
2
Check
Does the power supply
fan come on when you
turn on the printer?
Do any of the motors
rotate after the printer
starts up?
Result
Action
No
Remove the rear panel, I/O board,
and I/O shield, and restart the printer.
Yes
The problem is probably with the
power supply fan or its connection to
the DC controller board. Run the
printer diagnostic. If the diagnostic
suggests a fan problem, see Table 9.
Yes
Check the connections at J213 and
J214 on the DC controller board, and
check that nothing physical is blocking
the fan blades. If the problem persists,
replace the DC controller board.
No
Make sure J103 is connected at the
power supply. If TB201 is detached
from the DC controller, replace the DC
controller board; otherwise, replace
the power supply. If the problem
persists, replace the DC controller
board.
Troubleshooting
Flowcharts and Tables
222 2
2
Table 2. All LEDs Are Off After Printer Warmup
Step
Check
Result
Action
1
Are the top cover and
fuser door closed?
No
Close them completely, and confirm
that the plastic tab actuators on the
doors are intact. No LEDs illuminate if
either door is open.
2
Remove the rear panel
and I/O shield. Is the status panel cable securely
connected to J204 on the
DC controller board?
No
Secure the cable.
3
Can you print despite the
fact no LEDs illuminate?
Yes
Check connection between the status
panel and the DC controller board. If
the connections are secure, replace
the status panel.
4
Place probes between
J208-2 (GND) and J208-3
(PSNS) on the DC controller board. Does the voltage rise to 5 V as you
open the fuser door?
No
Replace the delivery/interlock
assembly.
5
Place probes between
J201-7 (+5 V) and J201-1
(GND) on the DC controller board. Switch on the
printer. Does the voltage
measure 5 V?
No
Replace the DC controller board.
6
Press the top cover interlock leaf spring. Do you
hear the clicking sound of
a microswitch when you
press the spring?
No
Confirm that the black plastic actuator
is in place behind the top of the pickup
controller board.
7
Remove the paper pickup
block and maintain pickup
connectivity. Place
probes between J601-11
(GND) and J601-7 (+5 V)
on the solder side of the
pickup controller board.
Does the voltage measure
5 V?
Yes
Replace the pickup controller board.
No
Replace the DC controller-board-topickup-controller-board cable.
2 2
Troubleshooting
Flowcharts and Tables
Table 3. Toner LED Is On or Flashes After Printer Warmup
Step
Check
Result
Action
1
Try a known-good toner
cartridge. Does the
problem persist?
No
Problem solved.
2
Have you recently serviced the printer and has
this symptom existed
ever since?
Yes
You probably did not fully reseat the
high-voltage power supply, connector
block, or transfer block assembly; or
connector J210 on the DC Controller
board is not secure. Make sure these
modules are securely installed.
3
Have you just performed
the engine diagnostic?
Yes
Confirm there is not still a serial loopback connector installed in the serial
port.
4
Remove the toner cartridge and inspect all the
toner contacts for damage
or excess toner buildup.
Are the contacts clean
and in good condition?
No
Clean or repair the contacts if possible. Take special note of TB403, which
is the pronged contact that the toner
cartridge mates into. This contact ties
into the toner sensor inside the cartridge.
5
Remove the rear panel
and I/O shield. Place
probes between J210-6
(HVRST) and J210-10
(GND) and switch on the
printer. Does the voltage
change from 0 to 5 V
about one second after
the printer starts up?
No
Replace the DC Controller board.
Yes
Perform the first module exchange
below. If the problem persists, reinstall
the original module and perform the
next exchange:
• Replace the HV power supply
• Replace the power supply-toHVPS interface board.
• Replace the transfer block assembly.
• Replace the DC controller-board-toHVPS cable.
Troubleshooting
222 2
Flowcharts and Tables
Table 4. Paper-Out LED is On After Printer Warmup
Step
Check
Result
1
Is the cassette empty or not
installed?
Yes
Make sure that the cassette is present
and has paper.
2
Remove the cassette and
inspect the paper-sensing
lever. Is the lever broken?
Yes
Replace the sensor holder
assembly.
3
Defeat the cassette paper
sensing lever by pushing it
and holding it in (as if a cassette were present). With
your other hand, press the
three microswitch leaf
springs all at the same time.
Does the ready LED illuminate after a couple of
seconds?
Yes
Replace the pickup controller board.
4
Remove the rear panel and
I/O shield. Place probes
between J201-7 (+5 V) and
J201-1 (GND) on the DC
controller board. Switch on
the printer. Does the voltage
measure 5 V?
No
Replace the DC controller board.
5
Remove the paper pickup
block and maintain pickup
connectivity. Place probes
between J601-11 (GND)
and J601-7 (+5 V) on the
solder side of the pickup
controller board. Does voltage measure 5 V?
No
Replace the DC-controller-to-pickupcontroller cable.
6
Measure the voltage
between J605-5 (GND) and
J605-3 (1STS). Does the
voltage measure 5 V?
No
Replace the pickup controller board.
7
Keep the probes in the
same position and manually
trip the cassette sensor
lever. Does the voltage drop
to 0 V when you trip the
lever?
No
Replace the sensor holder assembly.
Yes
Replace the pickup controller board.
2
Action
2 2
Troubleshooting
Flowcharts and Tables
Table 5. Paper-Jam LED is On After Printer Warmup
Step
Check
Result
Action
1
Is the delivery/interlock
sensor snagged?
Yes
Remove the top cover and delivery roller
assembly, and unsnag the sensor spring.
The spring should be straight. If the
actuator is snagged, it will not spring
back and forth as you try to trip it.
2
Is the delivery-sensing lever
snagged?
Yes
Remove the top cover and delivery roller
assembly and see what is snagging the
lever. If necessary, remove and
dismantle the fuser assembly and
replace the delivery-sensing lever.
3
Is the registration-sensing
lever snagged?
Yes
If the lever is broken or snagged, remove
the pickup block and troubleshoot
further. If necessary, replace the sensor
holder assembly.
4
Remove the rear panel, I/O
shield, top cover, and
delivery roller assembly. Is
the purple cable between the
delivery/interlock sensor and
the DC controller board
securely connected?
No
Secure the cable.
5
Place probes between J2082 (GND) and J208-3 (PSNS).
Does the voltage rise to 5 V
as you open the fuser door?
No
Replace the delivery/interlock assembly.
6
Place probes between
J201-7 (+5 V) and J201-1
(GRD) on the DC controller
board. Does the voltage
measure 5 V?
No
Replace the DC controller board.
Troubleshooting
222 2
Flowcharts and Tables
2
Table 5. Paper-Jam LED is On After Printer Warmup (Continued)
Step
Check
Result
7
Remove the paper pickup
block and maintain pickup
connectivity. Place probes
between J601-7 (+5 V) and
J601-11 (GND) on the solderside of the pickup controller
board. Does the voltage
measure 5 V?
No
Replace the DC-controller board-topickup-controller-board cable.
8
Place probes between
J605-6 (RESS) and J605-5
(GND). Does the voltage
measure 5 V?
No
Replace the pickup controller board.
9
Keep the probes in the same
position and manually trip the
registration sensor lever.
Does the voltage drop to 0 V
when you trip the lever?
No
Replace the sensor holder assembly.
Yes
Replace the DC controller board.
Important
Action
2 2
When there is a failure of the fusing system, the DC controller board shuts off
current to the fuser roller heater and charges capacitor C208 on the DC controller board to prevent overheating. If there is a failure of the fusing system, you
must turn off the power and leave it off for about 10 minutes, or manually
discharge the capacitor before switching power back on.
Table 6. Fuser Assembly Error
Step
Check
Result
Action
1
Remove the rear panel, I/O
board, and I/O shield. Is
connector J210 on the DC
controller board secure?
No
Secure the connector.
2
Is the power supply firmly
seated?
No
Seat the power supply.
Troubleshooting
Flowcharts and Tables
Table 6. Fuser Assembly Error (Continued)
Step
Check
Result
Action
3
Remove the fuser assembly
and let it cool. Measure the
resistance between J743-6
and J743-7 on the fuser.
(Refer to the wiring diagram
for illustration and pin layout
of connector J743.) Does the
resistance measure between
180 and 280 kΩ?
No
Disconnect J744 and check for same
resistance. Replace the thermistor or
the connector cable, as needed.
4
Measure the resistance
between J743-1 and J743-8
on the fuser. Does the
resistance measure
approximately 3 Ω or less?
No
If there is continuity through the heater
bulb, replace the heater bulb. If there
is continuity across the
thermoprotector, replace the fuser
connector cable. If there is not continuity across the thermoprotector
replace the thermoprotector, and
proceed to the next step.
5
Reinstall the fuser. Place
probes between J212-1
(/FSRD) and TB201-6 (GND)
on the DC controller board.
Does the voltage change
from approximately 5.1 V to
1.5 V a few seconds after the
printer starts up?
No
Replace the DC controller board.
6
Place probes between
J212-2 (RLD) and TB201-6
(GND). Does the voltage
measure approximately
2.1 V?
No
Replace the DC controller board.
Yes
Replace the power supply.
Troubleshooting
Flowcharts and Tables
222 2
2
Table 7. Laser/Scanner Error
Step
Check
Result
Action
1
Remove the rear panel and
I/O shield. Are the DC
controller board connectors J205 and J206
secure?
No
Secure the cables.
2
Remove the top cover and
delivery roller assembly.
Are all three laser/scanner
assembly connectors
secure?
No
Secure the cables.
3
Remove the two cables
that run from the DC
controller board to the
laser/scanner assembly
and check the resistance of
each. Is the resistance
approximately 1 ohm or
less for each wire?
No
Replace the defective cable.
Yes
Replace the laser/scanner assembly.
If the problem persists, reinstall the
original module and replace the DC
controller board.
2 2
Table 8. Main Motor Error
Step
Check
Result
Action
1
Remove the rear panel and
I/O shield. Is the main
motor cable secure at J211
on the DC controller board?
No
Secure the cable.
Yes
Perform the first module exchange
listed below. If the problem persists,
reinstall the original module and perform the next exchange:
• Replace the main motor.
• Replace the DC controller board.
• Replace the main motor cable.
Troubleshooting
Flowcharts and Tables
Table 9. Fan Error
Step
Check
Result
1
Remove the rear panel and
I/O shield. Are the fan
cables secure at J209,
J214, and J213 on the DC
controller board?
No
Secure the cables.
2
Observe fan operation of
FM1 (power supply fan),
FM2 (controller board fan),
and FM3 (internal fan).
FM1 and FM2 exhaust
outward through the vents
in the external plastics.
FM3 vents internally and
runs only during a print
cycle, so you’ll have to
remove the top cover and
defeat sensors to observe
it. Are all the fans operating
correctly?
No
Check power distribution to each fan
by placing multimeter probes between
pin 1 (fan drive) and pin 3 (ground) at
the DC controller connector for that
fan and restart the printer.
FM1: connector J209
FM2: connector J214
FM3: connector J213
Place the probes at J209-2
(FLOCK) and J209-3
(GND) on the DC controller
board, and switch on the
power. Does the voltage
measure 2.2 V or more?
Yes
Replace the power supply fan (FM1).
No
Replace the DC controller board.
3
Action
FM1, FM2, and FM3 should go from
0 V to 24 V then down to about 16 V.
If any of these does not behave in this
manner:
• Replace the DC controller board.
• Replace the power supply.
• Replace any faulty fan.
Troubleshooting
222 2
Flowcharts and Tables
2
Table 10. I/O Board Error
Step
Check
Result
Action
1
Do the diagnostic LEDs
indicate an I/O board error?
Yes
Replace the I/O board.
2
Did you receive a SIMM
error?
Yes
Replace the faulty SIMM.
3
Did you receive a ROM
error?
Yes
Replace the I/O board.
2 2
Troubleshooting
Flowcharts and Tables
The following graphic shows examples of image quality defects. Refer to theappropriate troubleshooting table to correct the quality of the image.
All-Blank
Page
See Table 11
All-Black
Page
See Table 12
Light/Faded
Image
See Table 13
Dark
Image
See Table 14
Black Vertical
Line(s)
See Table 15
White Vertical
Line(s)
See Table 16
Black Horizontal
Lines
See Table 17
Bad
Registration
See Table 18
Stairstepping
See Table 19
Vertical
Distortion
See Table 20
Bad
Fusing
See Table 21
Blank
Spots
See Table 22
Toner on
Back
See Table 23
Cannot Print
in PhotoGrade
See Table 24
Repetitive
Defects
See Table 25
White Horizontal
Stripes
See Table 7
Figure 2. Print Quality Problems
Troubleshooting
222 2
Flowcharts and Tables
2
Table 11. All-Blank Page
Step
Check
Result
Action
1
Is the sealing tape removed
from the toner cartridge?
No
Remove the sealing tape.
2
Have you recently installed
a laser/scanner unit and
has this symptom existed
since?
Yes
The laser shutter may have been
installed incorrectly. The shutter
should spring back and forth as you
insert the toner cartridge.
3
Does this symptom occur
only with envelopes?
Yes
Instruct the customer to adjust
margins in the software application.
4
Run the Extended PowerOn Self Test. Does the test
indicate a specific error?
Yes
Go to the appropriate troubleshooting
table that describes the error
indicated.
5
Remove the rear panel and
I/O shield. Place probes
between J210-6 (HVRST)
and J210-10 (GND). Does
the voltage change from 0
to 5 V about one second
after the printer starts up?
No
Replace the DC controller board.
6
Place probes between
J210-9 (SLO2) and J2
10-10 (GND). Does the
voltage measure
approximately 0.7 V about
one second after the main
motor starts?
No
Replace the DC controller board.
Yes
Perform the first module exchange
listed below. If the problem persists,
reinstall the original module and
perform the next exchange:
• Replace the high-voltage power
supply.
• Replace the power-supply-to-HVPS
interface board.
• Replace the transfer block assembly.
2 2
Troubleshooting
Flowcharts and Tables
Table 12. All-Black page
Step
Check
Result
Action
1
Run the Extended PowerOn Self Test (see “Printer
Diagnostics”). Does the test
indicate a specific error?
Yes
Go to the appropriate troubleshooting
table that describes the error
indicated.
2
Place probes between
J210-9 (SLO2) and
J210-10 (GND). Does the
voltage measure
approximately 0.7 V about
one second after the main
motor starts?
No
Replace the DC controller board.
Yes
Perform the first module exchange
listed below. If the problem persists,
reinstall the original module and
perform the next exchange:
• Replace the high-voltage power
supply.
• Replace the power-supply-to-HVPS
interface board.
Troubleshooting
Flowcharts and Tables
222 2
2
Table 13. Uniformly Light/Faded Image Over Entire Page
Step
Check
Result
Action
1
Adjust the density using the
Printer Utility. Does the
problem persist?
No
Problem solved.
2
Try printing with
known-good paper. Does
the problem persist?
No
Problem solved.
3
Replace the transfer roller
with a known-good transfer
roller. Does the problem
persist?
No
Problem solved.
4
Have you recently serviced
the printer and has this
symptom existed ever
since?
Yes
Confirm that the high-voltage power
supply is installed correctly and that
good contact is being made with the
transfer block assembly.
5
Remove the rear panel and
I/O shield. Place probes
between J210-9 (SLO2)
and J210-10 (GND) and
switch on the printer. Does
the voltage read about
0.7 V about one second
after the main motor starts?
No
Replace the DC controller.
Yes
Replace the high-voltage power
supply. If the problem persists, replace
the high-voltage connector board.
2 2
Troubleshooting
Flowcharts and Tables
Table 14. Uniformly Dark Image Over Entire Page
Step
Check
Result
Action
1
Adjust the density using the
Printer Utility. Does the
problem persist?
No
Problem solved.
2
Try printing with
known-good paper. Does
the problem persist?
No
Problem solved.
3
Clean the printer drum
grounding contact and
cartridge contact and print
a test page. Does the
problem persist?
No
Problem solved.
4
Remove the rear panel and
I/O shield. Place probes
between J210-6 (HVRST)
and J210-10 (GND). Does
the voltage change from 0
to 5 V about one second
after the printer starts up?
No
Replace the DC controller board.
Yes
Replace the high-voltage power
supply. If the problem persists, replace
the high-voltage connector board.
Table 15. Black Vertical Lines, Sharp and Well-Defined
Step
Check
Result
Action
1
Try a known-good toner
cartridge. Does the
problem persist?
No
Problem solved.
2
Does the symptom occur
on a service test page?
No
Replace the I/O board.
Yes
Replace the fuser assembly. If the
problem persists, replace the
laser/scanner assembly.
Troubleshooting
Flowcharts and Tables
222 2
2
Table 16. White Vertical Lines, Sharp and Well-Defined
Step
Check
Result
Action
1
Try a known-good toner
cartridge. Does the
problem persist?
No
Problem solved.
2
Is there a hair or other
obstruction that can be
blocking the laser beam?
Yes
Remove the obstruction.
3
Does the symptom appear
on the service test page?
No
Replace the I/O board.
Yes
Replace the laser/scanner assembly.
2 2
Table 17. Black Horizontal LInes, Sharp and Well-Defined
Step
Check
Result
Action
1
Try a known-good toner
cartridge. Does the
problem persist?
No
Problem solved.
2
Does the symptom appear
on the service test page?
No
Replace the I/O board.
Yes
Replace the laser/scanner assembly.
Troubleshooting
Flowcharts and Tables
Table 18. Bad Registration/Image Cut Off
Step
Check
Result
Action
1
Try printing with less paper
at the source. Does the
problem persist?
No
Problem solved.
2
Run a print from a different
paper source. Does the
problem persist?
No
Replace or reinstall the faulty pickup
roller.
3
Perform the registration
adjustment (see
”Registration Adjustment”
in this chapter). Does the
problem persist?
No
Problem solved.
Yes
Replace the sensor holder assembly.
Table 19. Stairstepping/Vertical Lines Jagged or Shaky
Step
Check
Result
Action
1
Run a service test page.
Does the problem persist?
No
Replace the I/O board.
2
Run the Extended PowerOn Self Test (see “Printer
Diagnostics”). Does the test
indicate a specific error?
Yes
Go to the appropriate troubleshooting
table that describes the error
indicated.
No
Replace the laser/scanner assembly.
If the problem persists, replace the DC
controller board.
Troubleshooting
Flowcharts and Tables
222 2
2
Table 20. Vertical Elongation or Foreshortening
Step
Check
Result
Action
1
Run the Extended PowerOn Self Test (see “Printer
Diagnostics”). Does the test
indicate a specific error?
Yes
Go to the appropriate troubleshooting
table that describes the error
indicated.
No
Perform the first module exchange
listed below. If the problem persists,
reinstall the original module and
perform the next exchange:
• Replace the laser/scanner assembly.
• Replace the DC controller board.
• Replace the main motor.
2 2
Table 21. Bad Fusing
Step
Check
Result
Action
1
Are the fuser roller levers in
a down (print-mode)
position?
No
Set the envelope levers to a down
(print-mode) position.
Yes
Go to Table 6, Fuser Assembly Error.
Table 22. Blank Spots/Random Pattern or Location
Step
Check
Result
Action
1
Try printing with
known-good paper. Does
the problem persist?
No
Problem solved.
2
Are humidity conditions
according to
specifications?
No
Inform the customer of the changes
that are necessary.
3
Are you printing on the
correct side of the paper?
No
Turn over the paper.
Yes
Go to Table 21, Bad Fusing.
Troubleshooting
Flowcharts and Tables
Table 23. Toner on Back of Page
Step
1
Check
Result
Is the toner smudge in a
small area behind the
upper-left corner of the
page?
Action
Yes
Clean or replace the pickup roller.
No
Clean with a dry, lint-free cloth or
replace the transfer roller, transfer
guide assembly, or lower fuser roller.
Table 24. Cannot Print in PhotoGrade
Step
Check
Result
Action
1
Have you upgraded printer
memory to 12 MB of RAM?
No
You must have a minimum of 12 MB of
RAM to run PhotoGrade at 600 dpi.
Table 25. Repetitive Defects
Step
Check
Result
Action
1
Try a known-good toner
cartridge. Does the
problem persist?
No
Problem solved.
2
Does the symptom occur
on a service test page?
No
Replace the I/O board.
3
Is the repetitive staining
along the left edge of the
paper?
Yes
Clean the feeder rollers with a dry,
lint-free cloth.
4
Interrupt a print cycle (see
“Interrupting a Print Cycle”
under “Troubleshooting
Tips”). Is the symptom
present on the drum?
Yes
Clean or replace the pickup/transfer
rollers and guides as required.
No
Clean or replace the fuser or delivery
rollers.
Troubleshooting
222 2
Flowcharts and Tables
2
Table 26. Picking Up From Wrong Source
Step
1
Check
Result
Is the selected paper
source empty?
Action
Yes
Select Paper Handling in the Apple
Printer Utility and disable the Tray
Switching option if you do not want
paper to feed from a secondary
source when the selected source is
empty.
No
There is a problem in the sensing
system. Make sure that automatic tray
switching is off and try printing again.
If there are jam or pickup problems at
that point, refer to Figure 3.
2 2
Leading Edge of
Jammed Paper Is
in Fuser/Delivery Area
Go to Table 21
Printer Is Picking Up
From Wrong Source
Go to Table 26
LaserWriter 16/600 PS
No Pickup From
Envelope Feeder
Go to Table 27
No Pickup From
Multipurpose Tray
Go to Table 28
No Pickup From
Standard Cassette
Go to Table 29
Leading Edge of
Jammed Paper Is
in Pickup/
Transfer Area
Go to Table 32
No Pickup From
Lower Cassette
Go to Table 30
Figure 3. Paper Transport Problems
Troubleshooting
Flowcharts and Tables
Table 27. No Pickup From Envelope Feeder
Step
Check
Result
Action
1
Is paper picking up
correctly from the standard
cassette?
No
Go to Table 29.
2
Remove the left, right, and
bottom covers of the
envelope feeder and install
the feeder into the pickup
block. Do the envelope
feeder motor and gearing
engage after you restart?
Yes
Remove the paper pickup block from
the printer and maintain pickup
connectivity (see “Troubleshooting
Tips” in this chapter).
3
Place probes on the solder
side of the pickup controller
board between J603-4
(GND) and the power supply side of diode D606.
Does the voltage measure
5 V?
No
Replace the pickup controller board.
Yes
Perform the first module exchange
below. If the problem persists, reinstall
the original module and perform the
next exchange:
• Replace the envelope feeder
controller board.
• Replace the printer interface cable
in the envelope feeder.
• Replace the feeder interface cable in
the pickup block.
4
Measure the voltage
between J604-4 (GND) and
J604-1 (+24 V). Does the
voltage measure 24 V?
No
Replace the pickup controller board.
5
Place probes between
J136-1 (+24 V) and
J136-4 (GND) on the
receptacle that the envelope feeder plugs into.
Does the voltage measure
24 V?
No
Replace the feeder interface cable.
Yes
Perform the first module exchange
below. If the problem persists, reinstall
the original module and
perform the next exchange:
• Replace the envelope feeder
controller board.
• Replace the envelope feeder motor.
• Replace the printer interface cable
inside the envelope feeder.
Troubleshooting
222 2
Flowcharts and Tables
2
Table 28. No Pickup From Multipurpose Tray
Step
Check
Result
Action
1
Is paper picking up correctly from the standard
cassette?
No
Go to Table 29
2
Maintain I/O connectivity
(see “Troubleshooting
Tips” in this chapter).
Do the pickup motor and
gearing engage after you
try printing to the
multipurpose tray?
No
Remove the rear panel and the right
corner panel and check that all the
following connectors are secure:
• DC controller board connector J201
• Pickup controller board connector
J601
• Pickup block motor cable J703
3
Remove the paper pickup
block and maintain pickup
connectivity (see
“Troubleshooting Tips” in
this chapter). Closely
observe the gear at the end
of the pickup block and
restart the printer. Do all
gears rotate correctly after
you restart?
No
Remount or replace the problem
gear(s).
4
Select the multipurpose
tray as paper source, and
print something. Does the
multipurpose pickup gear
rotate?
No
Make sure that the pickup gear and its
spring and hook are installed correctly.
If the problem persists, replace the
multipurpose pickup solenoid.
5
The problem is mechanical
and is caused by failure of
one of these components.
Restart the printer and
attempt another print job.
Observe the components
closely. Does the symptom
persist?
Yes
Remount, clear, or replace the defective component.
2 2
Troubleshooting
Flowcharts and Tables
Table 29. No Pickup From Standard Cassette
Step
Check
Result
Action
1
Initiate a service test page.
Does the printer pickup
from the standard
cassette?
Yes
Confirm that I/O cable connections
are secure and that configuration
settings are correct. To make certain
that networking or CPU software is not
the root problem, confirm through the
printer utility that the startup page is
enabled, and restart the printer. If the
startup page prints, there is a software
or networking problem away from the
printer. If the startup page does not
print, replace the I/O board.
2
Do the pickup motor and
gearing engage after you
restart the printer?
Yes
Remove the paper pickup block and
maintain pickup connectivity. Closely
observe the gear end of the pickup
block and restart the printer. All but
three ratchet gears should spin freely
during the startup sequence. If the
problem persists, remount or replace
the problem gear(s).
3
Remove the rear panel and
the right corner panel. Is
the pickup controller board
cable securely connected
to J201 on the DC
controller board?
No
Secure the cable.
4
Is the DC controller board
cable securely connected
to J601 on the pickup
controller board?
No
Secure the cable.
5
Is the pickup block motor
cable securely connected
at J703 on the pickup
sensor board?
No
Secure the cable.
Troubleshooting
222 2
Flowcharts and Tables
2
Table 29. No Pickup From Standard Cassette (Continued)
Step
Check
Result
6
Disconnect J201 on the DC
controller board. Place
probes between pins
J201-1 (GND) and
J201-13 (+24 V) on the
male connector on the
board. Does the voltage
measure 24 V?
No
Replace the DC controller board.
Yes
Replace the pickup-to-DC controller
board cable.
Place probes between pins
J201-1 (GND) and J201-7
(+5 V) on the male
connector on the board.
Does the voltage measure
5 V?
No
Replace the DC controller board.
8
Reconnect J201. Remove
the paper pickup block and
maintain pickup connectivity. Measure the voltage
between J601-11 (GND)
and J601-13
(+24 V) on the pickup
controller board. Does the
voltage measure 24 V?
No
Replace the pickup-controller-to-DCcontroller-board cable.
9
Place probes between pins
J601-1 (GND) and J601-7
(+5 V). Does the voltage
measure 5 V?
No
Replace the pickup-controller-to-DCcontroller-board cable.
10
Place probes between pins
J601-1 (GND) and J601-9
(+24 V). Does the voltage
measure 24 V?
No
Replace the pickup controller board.
Yes
Perform the first module exchange
below. If the problem persists, reinstall
the original module and perform the
next exchange:
• Replace the pickup motor.
• Replace the pickup sensor board.
7
Action
2 2
Troubleshooting
Flowcharts and Tables
Table 30. No Pickup From Lower Cassette
Step
Check
Result
Action
1
Is paper picking up
correctly from the standard
cassette?
No
Go to Table 29.
2
Disable the startup test
page, and remove the top
cover, rear panel, and right
corner panel from the
printer. Disconnect J603
from the exposed edge of
the controller board and
connect a spare sheet
feeder interface cable. Plug
the opposite end of the
interface cable into the
sheet feeder receptacle. Is
paper now picked up from
the lower cassette?
Yes
Replace the sheet feeder interface
cable.
3
Reinstall the sheet feeder
and restart the printer. Do
the sheet feeder gearing
and motor rotate?
No
Confirm that the sensing arm is intact
and that the lower cassette is
installed. Check that the following
connectors are secure:
• Connector J201 on the DC controller
board.
• The two connectors at the edge of
the pickup controller board.
• The three connectors at the edge of
the sheet feeder controller board.
4
Switch off the printer and
remove the 4-pin cable
from connector J603 along
the front edge of the pickup
controller board. Place
probes between J603-1
(+24 V) and J603-4 (GND)
on the pickup controller
board. Does the voltage
measure 24 V when you
switch on the printer?
No
Replace the pickup controller board.
Yes
Perform the first module exchange
listed below. If the problem still persists, reinstall the original module and
perform the next exchange.
• Replace the sheet feeder controller
board.
• Replace the sheet feeder controller
block.
• Replace the sheet feeder motor.
Troubleshooting
222 2
Flowcharts and Tables
2
Table 30. No Pickup From Lower Cassette (Continued)
Step
Check
Result
Action
5
Remove the paper pickup
block and maintain pickup
connectivity (see
“Troubleshooting Tips” in
this chapter). Place probes
on the solder side of the
pickup controller board on
J603-4 (GND) and the
power supply side of diode
D606. Does the voltage
measure 5 V when you
switch on the printer?
Yes
Perform the first module exchange
listed below. If the problem still persists, reinstall the original module and
perform the next exchange.
• Replace the sheet feeder controller
board.
• Replace the sheet feeder pickup
solenoid.
• Replace the sheet feeder controller
block.
• Remount and/or replace the pickup
shaft gear and roller.
6
Place probes between pins
J201-1 (GND) and J201-7
(+5 V) on the DC controller
board. Does the voltage
measure 5 V?
No
Perform the first module exchange
listed below. If the problem still persists, reinstall the original module and
perform the next exchange.
• Replace the I/O board
• Replace the DC controller board.
Yes
Replace the pickup controller board.
2 2
Troubleshooting
Flowcharts and Tables
Table 31. Leading Edge of Jammed Paper Is in
Fuser/Delivery Area
Step
Check
Result
Action
1
Do the delivery rollers turn
when you start up the
printer?
No
Go to Step 6.
2
Is there crumpled paper
just outside the exit point of
the fuser assembly?
Yes
A snagged sensing lever is probably
the cause of the problem. Remove the
top cover and delivery roller assembly,
and inspect the delivery/interlock
sensor. If the delivery-sensing lever is
broken, replace it.
3
Is there an accordian-style
jamming just short of the
paper delivery tray?
Yes
The delivery guide pins might have
been installed incorrectly. These are
the four small pins on the delivery
roller assembly. They should point
outward, with the flow of paper.
4
Does jamming occur only
when paper feeds from the
multipurpose tray?
Yes
Inspect the sensing lever for
multipurpose paper-end sensor
PS701. Unsnag or replace it if it is
damaged.
5
Remove the rear panel and
I/O shield. Place probes
betweenJ208-2 (GND) and
J208-3 (PSNS) on the DC
controller board. Does the
voltage rise from 0 to 5 V
as you open the fuser
access door?
Yes
Replace the DC controller board.
No
Replace the delivery/interlock sensor.
6
Remove the rear panel and
I/O shield. Restart the
printer and observe the
main motor. Does the main
motor spin when the printer
starts up?
Yes
Trace mechanical drive components
from the delivery rollers back to the
main motor, taking special note of the
delivery drive belt. Clean or replace
parts as necessary.
7
Make sure that the main
motor is secure at J211 on
the DC controller board,
then run the Extended
Power-On Self Test. Does
the diagnostic indicate a
main motor error?
Yes
Go to Table 8.
No
Check main motor drive components
for binding or improper installation.
Clean or replace parts as required.
Troubleshooting
Flowcharts and Tables
222 2
Table 32. Leading Edge of Jammed Paper Is in Pickup/Transfer Area
Step
Check
Result
2
Action
1
Try printing with
known-good paper. Does
the problem persist?
No
Problem solved.
2
Try feeding the paper from
one of the other paper
sources. Does jamming still
occur?
No
Go to Table 33, 34, 35, or 36, as
applicable.
3
Remove the toner cartridge, hold the green knob,
and lift the delivery guide.
Does the registration sensor arm move back and
forth freely when you flick it
with your finger?
No
Clear it if possible. If the arm is
snagged beyond repair, replace the
sensor holder assembly.
4
Check for obstructions,
especially beneath the
upper guide plate situated
between the pickup block
and the transfer roller. Are
there obstructions?
Yes
Clear the obstructions.
5
Is the trailing edge of the
jammed paper about an
inch short of the registration sensor arm?
Yes
If paper has jammed there, especially
if there is no sign of crumpling, there is
almost certainly a failure in the
delivery sensing system. Go to
Table 31.
6
Remove the paper pickup
block from the printer and
maintain pickup
connectivity. You will be
taking measurements from
the solder side of the
pickup controller board.
Place probes between
J605-5 (GND) and J605-6
(RESS) and manually trip
the registration sensor arm.
Does the voltage measure
about 5 V (normal) and 0 V
(tripped)?
Yes
Replace the pickup controller board.
No
Replace the sensor holder assembly.
2 2
Troubleshooting
Flowcharts and Tables
Table 33. Paper Jams in Pickup/Transfer Area When Feeding From
the Standard Cassette
Step
Check
Result
Action
1
Is the black ribbed paper
guide firmly seated?
No
Reseat the black ribbed paper guide.
If this guide is damaged or unseated,
paper may jam at the entrance to the
paper pickup block.
2
Is the white passive roller
on the cassette OK?
No
Clean the roller so that it forms a
smooth gripping surface against the
lower feed roller.
3
Is the lower feed roller OK?
No
Replace or reinstall the lower feed
roller and/or its gearing. Note that the
upper feed rollers serve other paper
sources, so they are not likely to be
the cause of the problem.
Table 34. Paper Jams in Pickup/Transfer Area When Feeding From the
Multipurpose Tray
Step
Check
Result
Action
1
Try printing with knowngood paper. Does the problem persist?
No
Problem solved.
2
Is the multipurpose tray
width guide set correctly?
No
Set the guide so that it is snug against
the edge of the paper.
3
Is the multipurpose pickup
roller slipping when it tries
to pull in the paper?
Yes
Reinstall or replace the multipurpose
pickup roller. If you have recently
taken apart the pickup block gearing
and paper has not fed successfully
since then, the problem could be
incorrect installation of the gears.
4
Are there two sheets at the
jam location?
Yes
Replace the multipurpose tray guide
assembly.
Troubleshooting
222 2
Flowcharts and Tables
Table 35. Paper Jams in Pickup/Transfer Area When Feeding From the
Optional Sheet Feeder
Step
Check
Result
Action
1
Is the black ribbed paper
guide firmly seated?
No
Reseat the black ribbed paper guide.
If this guide is damaged or unseated,
paper may jam at the entrance to the
paper pickup block.
2
Is the standard 250-sheet
cassette installed and in
good condition?
No
Paper fed from the sheet feeder
passes through the slit in the standard
cassette located 2 inches back from
the face plate. Make sure the standard
cassette is fully inserted and that no
blockage exists in this opening.
3
Are the feeder rollers in the
sheet feeder OK?
No
The sheet feeder has one primary and
two passive feeder rollers. Because
power is reaching the pickup roller,
any problem would probably be with
binding or obstruction in the
roller/gear system. Perform the sheet
feeder bypass procedure and observe
the functioning of the feeder
components (see Service Source CD
for additional information).
2
2 2
Troubleshooting
Flowcharts and Tables
Table 36. Paper Jams in Pickup/Transfer Area When Feeding From the
Envelope Feeder
Step
Check
Result
Action
1
Is the envelope feeder
width guide set correctly?
No
Set the guide so that it is snug against
the edge of the envelopes.
2
Is the envelope feeder
correctly installed into the
printer?
No
Reinstall the feeder so that it is
mounted solidly onto the black
positioning pin in the upper-left corner
of the pickup block opening. If the
feeder isn’t mounted correctly, or if the
pin is damaged, the pickup block
entrance may not align properly.
3
Have you recently taken
the feeder apart and has it
exhibited this problem
since then?
Yes
You may not have reinstalled the
gear/roller system correctly. Refer to
Service Source CD for more information.
4
Is the fork-shaped
separation guide installed
correctly?
No
There should be a 1.5 mm opening
between the separation guide and the
primary feed roller. Refer to the
Adjustments chapter in the LW 16/600
PS Envelope Feeder manual on
Service Source CD for more information.
K Service Source
Take Apart
LaserWriter 16/600 PS
Take Apart
Rear Panel - 1
Rear Panel
No preliminary steps are
required before you begin
this procedure.
Rear Panel
Take Apart
Rear Panel - 2
1
Cover Liner Screw
2
Rear Panel
Open the toner access
cover and remove the
cover liner screw.
Grip the upper corner
of the rear panel with
your left hand as shown.
Take Apart
Rear Panel - 3
3
Hook
Hook
Hook
Place your right
fingertips on the I/Olabel end of the rear
panel, swing the panel
outwards, and remove
the panel from the
printer.
Replacement Note:
Angle the three hooks in
the rear panel into the
openings in the right
rear panel. Then swing
the rear panel closed,
being sure to slide the
tab beneath the cover
liner. If the cover liner
screw hole does not line
Take Apart
Rear Panel - 4
up, gently strike the I/O-label end of the panel with the
base of your palm to position the panel properly.
Take Apart
Top Cover - 5
Top Cover
Top Cover
Before you begin, open the
multipurpose tray and
remove the rear panel
Note: The cover liner comes
off with the removal of the
top cover.
Take Apart
Screw
Top Cover - 6
Screw
1
Remove the two screws
inside the fuser access
door.
Take Apart
Top Cover - 7
2
Using a small flat-blade
screwdriver, release the
four flex tabs at the four
locations indicated and
separate the liner from
the printer.
Take Apart
Top Cover
Top Cover - 8
Cover Liner
3
Remove the top cover and
cover liner from the
printer.
Take Apart
Top Cover - 9
Replacement Note:
When you reseat the top
cover and cover liner,
reach through and
gently press the delivery
surface until the
levelling pin pops into
place.
Ê
Take Apart
Top Cover - 10
Replacement Note: The two
hinge assemblies are
identical and are fully
interchangeable. The
components are also
universal (that is, each of
the four arms, four
housings, and two pins are
identical.) The illustration
shows the hinge assembly in
its correct intact state with
the pin exploded out for
clarity.
Take Apart
Front Panel - 11
Front Panel
Before you begin, remove
the following:
• Rear panel
• Top cover
Front Panel
Take Apart
Front Panel - 12
Tab 2
Tab 3
Tab 1
Tab 4
Note: The front panel is
secured to the printer by
three fixed wrap-around
tabs (1, 3, 4), one flex tab
(2), and six positioning tabs
and blocks along the base.
The following pages
describe the order of tab
release.
Take Apart
Front Panel - 13
Releasing Tab 1
1
Tab 1
Grasp the front panel
with your fingertips and
pull it outward slightly
to release the upper
fixed tab on the right
side.
Take Apart
Front Panel - 14
Releasing Tab 2
2
Tab 2
Tab 2
Reach behind the front
panel and release the
flex tab that secures the
front panel to the
chassis.
Take Apart
Front Panel - 15
Cassette
Stop
Cover
Releasing Tabs 3 and 4
3
4
Remove the cassette stop
cover.
Note: The status panel
will still connect the
chassis to the front panel
after you perform the
following step.
Grip the bottom-left and
bottom-right corners
with your fingertips,
release tabs 3 and 4, and
swing the front panel
downward.
Tab 3
Status Panel
(Opposite Side)
Tab 4
Take Apart
Front Panel - 16
5
Tab
Tab
Status Panel
Tab
Tab
If you need to have
functional LEDs after
you remove the panel,
don’t disconnect the
connector. Simply
release the tabs and lift
off the whole status
panel.
If you don’t need
functional LEDs,
disconnect the cable
from the status panel
connector and remove
the front panel.
Take Apart
I/O Board - 17
I/O Board
I/O Board
Before you begin, remove
the following:
• Rear panel
• Internal hard drive (if
present)
• Fax card (if present)
Note: If the I/O board is
removed from the printer,
the LEDs no longer function.
Note: Remove the SIMMs
before returning a defective
I/O board to Apple.
Take Apart
I/O Board - 18
1
Power Supply Cable
Disconnect the power
supply cable.
Take Apart
I/O Board - 19
2
Printer Interface Cable
Disconnect the printer
interface cable.
Take Apart
I/O Board - 20
3
Remove the 5 screws
that secure the I/O board
to the printer.
Take Apart
I/O Board - 21
4
Lift the I/O board out of
the printer.
Take Apart
I/O Shield - 22
I/O Shield
I/O Shield
Before you begin, remove
the following:
• Rear panel
• I/O board
Take Apart
I/O Shield - 23
1
Remove the 12 screws
that connect the I/O
shield to the chassis.
Take Apart
I/O Shield - 24
2
Lift the I/O shield from
the printer.
Take Apart
Right Corner Panel - 25
Right Corner Panel
Before you begin, remove
the following:
• Rear panel
• Top cover
1
Right Corner Panel
Remove the two screws
that secure the right
corner panel to the
chassis.
Take Apart
Right Corner Panel - 26
2
Access
Hole
Right
Corner
Panel
3
Reach into the access
hole as shown in the
photo at the left, and
release the hidden flex
tab.
Remove the right corner
panel from the printer.
Take Apart
Multipurpose Tray Assembly - 27
Multipurpose
Tray Assembly
Before you begin, remove
the following:
• Paper cassette
• Rear panel
• Top cover
• Right corner panel
• Front panel
Multipurpose Tray
Assembly
Take Apart
Multipurpose Tray Assembly - 28
1
2
Push on the rounded
recess at the top of the
tray cover and open the
multipurpose tray.
Bend the edge guide
outward and release the
left pin and then the
right pin. Tilt the tray
up into its normal
closed position.
Note: The tray cover and
extension guide should now
be in an open position as
shown in the photograph at
the left.
Take Apart
Multipurpose Tray Assembly - 29
3
4
5
Grasp the sides of the cover and bend the center with
your thumbs until the cover pops loose from its pin
hinges. Remove the multi-purpose tray cover from the
printer.
Remove the two screws and lift off the lateral brace.
Open the multipurpose tray until it angles downward and
slide the tray off the holding pins.
Take Apart
Multipurpose Closure Panel - 30
Multipurpose
Closure Panel
No preliminary steps are
required before you begin
this procedure.
Note: The user removes this
panel prior to installing the
envelope feeder.
Multipurpose
Closure Panel
Take Apart
Multipurpose Closure Panel - 31
1
Open the mulitpurpose
tray cover by pressing
on the cover and letting
it drop into feed-ready
position.
Take Apart
Multipurpose Closure Panel - 32
2
Grasp the squared notch
at the top of the panel
between your thumb and
forefinger, press down
slightly, and lift out the
panel.
Take Apart
Fuser Access
Door
Fuser Access Door - 33
Fuser Access Door
No preliminary steps are
required before you begin
this procedure.
Take Apart
Fuser Access Door - 34
Strap Hinge
1
2
Open the fuser access
door.
Using needlenose pliers,
squeeze the flex-tab end
of the strap hinge and
remove the hinge from
its mount.
Take Apart
Fuser Access Door - 35
3
Grasp the sides of the
door and bend the center
with your thumbs until
the door pops loose from
its pin hinges.
Take Apart
Fuser Assembly - 36
Fuser Assembly
No preliminary steps are
required before you begin
this procedure.
Fuser
Assembly
Note: Refer to the following
take-apart topics for
further disassembly of the
fuser assembly:
– Fuser Cable Cover
– Left Fuser Cover Cap
– Left Fuser Cover
– Fuser Connector Cable
– Fuser Thermoprotector
– Right Fuser Cover
– Fuser Heater Bulb
– Upper Fuser Frame
Take Apart
Fuser Assembly - 37
– Fuser Thermosensor
– Delivery-Sensing
Lever
Note: Unless noted
otherwise, left and right
are defined by viewing the
printer through the fuser
door opening.
Take Apart
Fuser Assembly - 38
Strap Hinge
1
2
Open the fuser access
door.
Using needlenose pliers,
squeeze the flex-tab end
of the strap hinge and
remove the hinge from
its mount.
Take Apart
Fuser Assembly - 39
3
4
Remove the two screws.
Note: There is a receptacle left of center on the rear face
of the fuser assembly. The receptacle mates with the
high-voltage power supply and may cause slight
resistance when you pull out the fuser in the following
step.
Raise the fuser slightly to clear the two positioning nibs,
press down on the green jam-release arm, and pull out
the fuser.
Take Apart
Fuser
Cable
Cover
Fuser Cable Cover - 40
Fuser Cable Cover
Before you begin, remove
the fuser assembly.
Note: The fuser cable cover
is the black plastic cover on
the intake side of the fuser
assembly. The yellow
caution label is on the
surface of this cover.
Ê
Fuser
Assembly
Take Apart
Fuser Cable Cover - 41
Fuser Cable Cover
B
C
A
A
B
A
Note: The cable cover is
secured to the fuser by three
pairs of flex tabs (A) and
two conical posts (B)
hidden behind the yellow
label, and by a single flex
tab (C) to the left of the
entrance guide.
Use a small flat-blade
screwdriver to release the
flex tabs. Start at the gear
end of the fuser and work
left.
Take Apart
Fuser Cable Cover - 42
1
1
Fuser Cable
Cover
2
First Pair
of Tabs
3
4
2
Release the upper of the
first pair of tabs (1)
and pull the cover out as
far as it will go (2).
Then release the bottom
tab (3) and pull the
cover farther off the
fuser assembly (4).
Repeat this procedure
for the next two pairs of
flex tabs and remove the
cover from the fuser.
Take Apart
Left Fuser Cover Cap - 43
Left Cover
Cap
Left Fuser Cover
Cap
Before you begin, remove
the fuser assembly.
Note: The left fuser cover
cap is the black plastic cap
on the gear end of the fuser
assembly.
Fuser
Assembly
Take Apart
Left Fuser Cover Cap - 44
1
2
3
4
1
Left Cover Cap
2
Release the two flex tabs
(1, 2) and pull the cap
from the fuser as far as
it will go.
Using a small flat-blade
screwdriver, unseat the
two fixed tabs (3, 4) and
pull the cap off the fuser
assembly.
Take Apart
Left Fuser Cover Cap - 45
Heater Bulb
Cables
Tracking
Channel
Replacement Note: Be sure
to press the cables into the
tracking channel in the left
cover before you replace
the cover cap.
Take Apart
Left Fuser Cover - 46
Left Fuser
Cover
Fuser
Assembly
Left Fuser Cover
Before you begin, remove
the following:
• Fuser assembly
• Fuser cable cover
• Left fuser cover cap
Note: The left fuser cover is
the black plastic cover that
sits beneath the cover cap on
the gear end of the fuser.
The left fuser cover
supports the end of the
heater bulb and encloses the
fuser gears.
Take Apart
Left Fuser Cover - 47
1
Black
Cable
2
2
White
Cable
Junction
Cap
1
Remove the two screws
(1 and 2).
Remove the black cable
from the channel and
disconnect the white
cable at the junction cap.
Take Apart
Left Fuser Cover - 48
3
23T Gear
19T Gear
Left
Cover
Pull off the cover.
Caution: The two gears slide
off the fuser if you turn the
fuser on end. If you are
replacing other pieces,
remove the gears and set
them aside.
Take Apart
Fuser Connector Cable - 49
Fuser Connector
Cable
Fuser
Connector
Cable
J743
J744
Fuser
Assembly
Before you begin, remove
the following:
• Fuser assembly
• Fuser cable cover
• Left fuser cover cap
Note: The fuser connector
cable delivers high-voltage
power to the fuser bulb and
receives temperature
feedback from the
thermosensor. If you are
looking from the feed side of
the fuser, the thermosensor
circuit goes to the left and
Take Apart
Fuser Connector Cable - 50
Fuser
Connector
Cable
the heater bulb circuit goes
to the right.
1
2
Thermosensor
Cable
Receptacle
Unplug the thermosensor cable and slide
the receptacle off the
frame.
Remove the screw that
secures the fuser
connector cable to the
thermoprotector contact.
Take Apart
Fuser Connector Cable - 51
3
Junction Cap
Disconnect the white
heater bulb cable at the
junction cap on the gear
end of the fuser.
Take Apart
Fuser Connector Cable - 52
4
Channel
Remove the fuser
connector cable from
the channel in the left
fuser cover.
Take Apart
Fuser Connector Cable - 53
5
Expansion
Posts
Receptacle
Release the expansion
posts behind the
receptacle and remove
the connector cable
from the fuser assembly.
Take Apart
Fuser
Thermoprotector
Fuser Thermoprotector - 54
Fuser
Thermoprotector
Before you begin, remove
the following:
• Fuser assembly
• Fuser cable cover
Note: The fuser
thermoprotector prevents
overheating of the fuser
bulb.
Fuser
Assembly
Caution: When the
thermoprotector has blown,
replacing it does not
necessarily solve the
problem. You must
Take Apart
Fuser Thermoprotector - 55
investigate root causes of the
overheating.
1
2
1
2
Flex Tab
Thermoprotector
Remove the two screws
that secure the cables to
the thermoprotector
contacts.
Press the flex tab that is
visible just under the
right cover and pop out
the thermoprotector
assembly.
Take Apart
Right Fuser Cover - 56
Right Fuser Cover
Right
Fuser
Cover
Before you begin, remove
the following:
• Fuser assembly
• Fuser cable cover
Note: The right fuser cover
is the black plastic cover on
the lever end of the fuser
assembly. The right fuser
cover supports the end of the
heater bulb and routes the
thermosensor cabling.
Fuser
Assembly
Take Apart
Right Fuser Cover - 57
1
2
Heater Bulb Cable
Thermosensor Cable
Unplug the thermosensor cable.
Remove the screw that
secures the heater bulb
cable to the thermoprotector contact.
Take Apart
Right Fuser Cover - 58
3
Thermosensor Cable
Remove the thermosensor cable from the
channel in the fuser
cover.
Take Apart
Right Fuser Cover - 59
4
5
Remove the two brass
colored screws.
Pull the cover down
slightly to unseat it from
the upper frame, and lift
the cover off the fuser.
Note: It may be
necessary to pry a bit
between the cover and
the frame with a small
flat-blade screwdriver.
1
2
Replacement Note: Make
sure that the roller release
lever is set in place
correctly prior to
reassembly.
Take Apart
Fuser
Heater
Bulb
Fuser
Assembly
Fuser Heater Bulb - 60
Fuser Heater Bulb
Before you begin, remove
the following:
• Fuser assembly
• Fuser cable cover
• Left fuser cover cap
• Left fuser cover
• Right fuser cover
Take Apart
Fuser Heater Bulb - 61
Fuser Heater Bulb
1
Note: Be careful not to
touch the glass part of
the bulb with your
fingers.
Grasp the left end of the
bulb and carefully slide
the bulb out of the fuser
assembly.
Take Apart
Upper Fuser
Frame
Fuser
Assembly
Upper Fuser Frame - 62
Upper Fuser
Frame
Before you begin, remove
the following:
• Fuser assembly
• Fuser cable cover
• Fuser thermoprotector
• Left fuser cover cap
• Right fuser cover
Take Apart
Upper Fuser Frame - 63
Spring
Upper
Frame
Note: In the following steps,
only the spring and the catch
on the near side are shown in
the drawing.
1
2
Catch
Remove the two springs.
Release the catches at
each end of the upper
frame and lift the frame
up and off the fuser
assembly.
Take Apart
Fuser
Thermosensor
Fuser
Assembly
Fuser Thermosensor - 64
Fuser
Thermosensor
Before you begin, remove
the following:
• Fuser assembly
• Fuser cable cover
• Fuser thermoprotector
• Left fuser cover cap
• Right fuser cover
• Upper fuser frame
Note: The thermosensor
monitors the temperature
of the fuser bulb and relays
the temperature back to the
DC controller board.
Take Apart
Fuser Thermosensor - 65
1
Thermosensor
Upper
Frame
Remove the screw that
connects the thermosensor to the upper
fuser frame and lift off
the thermosensor.
Take Apart
DeliverySensing
Lever
Fuser
Assembly
Delivery-Sensing Lever - 66
Delivery-Sensing
Lever
Before you begin, remove
the following:
• Fuser assembly
• Fuser cable cover
• Fuser thermoprotector
• Left fuser cover cap
• Right fuser cover
• Upper fuser frame
Note: Paper exiting the
fuser trips the deliverysensing lever, which in turn
opens a photo interrupter
in the delivery/interlock
sensor assembly. See
Take Apart
Delivery-Sensing Lever - 67
“Sensing System Theory” in
Basics.
Separation
Guide
1
Pin
2
Note: There are two pins
at the ends of the
separation guide that
seat into the frame. Only
one end is shown in the
drawing.
Using a small flat-blade
screwdriver, pry the
separation guide off the
frame at the gear end of
the fuser assembly.
Lift the separation guide
from the fuser assembly.
Take Apart
Delivery-Sensing Lever - 68
3
Separation Guide
Sensing
Lever
Grip Connection
Snap the lever out of the
grip in the separation
guide and pull the lever
off the post.
Take Apart
Delivery Roller Assembly - 69
Delivery Roller
Assembly
Before you begin, remove
the following:
• Rear panel
• Top cover
Delivery
Roller
Assembly
Note: Refer to the following
take-apart topics for
further disassembly of the
delivery roller assembly:
– Upper Delivery Guide
– Lower Delivery Roller
Shaft
– Upper Delivery Roller
Shaft
– Delivery Drive Belt
Take Apart
Delivery Roller Assembly - 70
Note: The double-roller shaft design yields an S-shaped
paper path that handles heavier paper than was possible in
previous engines. As a result, there is no face-up delivery
tray in the LaserWriter 16/600 PS.
Take Apart
Delivery Roller Assembly - 71
Ground Plate
1
Disconnect the ground
plate from the chassis.
Take Apart
Delivery Roller Assembly - 72
2
Place your left hand as
shown and press upward
on the lower roller
shaft.
Take Apart
Delivery Roller Assembly - 73
3
1
2
Using a small flat-blade
screwdriver, press in on
the left gripper tab (1)
and then the right tab
(2), and disengage the
assembly from the
chassis.
Take Apart
Delivery Roller Assembly - 74
4
Place your right hand
opposite your left and
pull the assembly from
the printer, using the
rolling motion indicated.
Take Apart
Upper
Delivery
Guide
Delivery
Roller
Assembly
Upper Delivery Guide - 75
Upper Delivery
Guide
Before you begin, remove
the following:
• Rear panel
• Top cover
Take Apart
Upper Delivery Guide - 76
1
Disconnect the ground plate from the chassis.
3
Release the tab and grip on the left side and remove the
delivery guide from the delivery roller assembly.
2
Release the flex tab on the right side of the delivery
roller assembly and pop the delivery guide free of the
upper delivery roller.
Take Apart
Upper Delivery Guide - 77
Delivery Guide Pins
Replacement Note: The four
small delivery guide pins
that hang freely on the
upper shaft must point
outward (with the flow of
paper).
Take Apart
Lower
Delivery
Roller
Shaft
Delivery
Roller
Assembly
Lower Delivery Roller Shaft - 78
Lower Delivery
Roller Shaft
Before you begin, remove
the following:
• Rear panel
• Top cover
• Delivery roller assembly
Take Apart
Lower Delivery Roller Shaft - 79
1
2
Remove the E-ring on the right side of the shaft and slide
off the bushing.
Caution: The four lower passive delivery rollers will
fall out when you perform the following procedure.
Push the delivery roller shaft to clear the left grip and
drive belt and lift the shaft from the delivery roller
assembly.
Take Apart
Upper
Delivery
Roller
Shaft
Delivery
Roller
Assembly
Upper Delivery Roller Shaft - 80
Upper Delivery
Roller Shaft
Before you begin, remove
the following:
• Rear panel
• Top cover
• Delivery roller assembly
• Upper delivery guide
Take Apart
Upper Delivery Roller Shaft - 81
1
2
Remove the E-ring on the right side of the shaft and slide
off the bushing.
Push the delivery roller shaft to clear the left grip and
drive belt and lift the shaft from the delivery roller
assembly.
Take Apart
Upper Delivery Roller Shaft - 82
Delivery Guide Pins
Replacement Note: The
four small delivery
guide pins that hang
freely on the upper shaft
must point outward
(with the flow of paper).
Take Apart
Delivery Drive Belt - 83
Delivery Drive Belt
Delivery Drive
Belt
Before you begin, remove
the following:
• Rear panel
• Top cover
• Delivery roller assembly
Note: This cogged belt
transfers drive upward to
the delivery roller shafts.
See “Mechanical Drive
Theory” in Basics.
Delivery
Roller
Assembly
Take Apart
Delivery Drive Belt - 84
1
2
Lower
Shaft
Spring
Remove the spring.
Slip the drive belt off
the gear on the lower
delivery roller shaft.
Take Apart
Delivery Drive Belt - 85
3
Pin
Jam-Release Arm
Rotate the green jamrelease arm counterclockwise as far as it
will go, lifting the arm
slightly to clear the
small wedge-shaped pin.
Take Apart
Delivery Drive Belt - 86
4
Pry off the jam-release
arm with a small flatblade screwdriver.
Note: The spindle is
connected to the end plate so
the gear is now free. It stays
in place because the drive
belt is holding it.
5
Push the belt through,
slip off the gear, and
pull out the drive belt.
Take Apart
Delivery Drive Belt - 87
Replacement Note: The final step in replacement is the
looping of the belt over the lower roller shaft gear.
First, use the rounded end of the jam-release arm to stretch
the belt outward. Then with your fingertips pressing the
belt firmly against the side of the gear, slowly rotate the
drive shaft and let the belt shift onto the gear.
Take Apart
Delivery/Interlock
Sensor
Delivery/Interlock Sensor - 88
Delivery/Interlock
Sensor
Before you begin, remove
the following:
• Rear panel
• Top cover
• Delivery roller assembly
Note: The delivery/
interlock sensor (PS201)
senses closure of the fuser
access door and the exiting of
paper from the fuser
assembly. See “Sensing
System Theory” in Basics.
Take Apart
Delivery/Interlock Sensor - 89
Cable
1
Disconnect the cable
from the photo IC.
Take Apart
Delivery/Interlock Sensor - 90
2
Upper
Edge
To remove the sensor
holder from the
printer, raise the upper
edge and slide the holder
upwards off the chassis.
Take Apart
Laser/Scanner Assembly - 91
Laser/Scanner
Assembly
Laser/
Scanner
Before you begin, remove
the following:
• Rear panel
• Top cover
• Delivery roller assembly
Review
“LaserWriter Safety” in
Basics before working with
the laser/scanner assembly.
±Warning:
Note: The LaserWriter 16/
600 PS laser/scanner
assembly is available only
as an integral assembly. No
Take Apart
Laser/Scanner Assembly - 92
subparts are available from Apple and no power adjustments
are possible.
1
2
Remove the four cables from the cable clips and
disconnect the cables at their connectors.
Note: There is no fiber-optic cable in the LaserWriter
16/600 PS. Beam detection circuitry runs through the
BD IC unit at connector J731 (see “Wiring Diagram” in
Troubleshooting Info).
Remove the four screws and lift the laser/scanner
assembly from the printer.
Note: Remove the shutter and the shutter spring prior
to returning a laser/scanner assembly to Apple.
Replacement Note: Perform the “Registration
Adjustment” procedure (see Adjustments chapter).
Take Apart
Laser/Scanner
Assembly
Shutter Lever
Laser/Scanner Assembly - 93
Replacement Note: Make
sure that the shutter and the
shutter lever are reinstalled
in the position shown.
Confirm installation by
pushing the lever against the
edge of the shutter. The
shutter should open freely
when actuated by the lever,
and the shutter should
Laser Shutter spring back fully when you
release it.
Take Apart
DC Controller Board - 94
DC Controller Board
DC Controller
Board
Before you begin, remove
the following:
• Rear panel
• I/O board
• I/O shield
Take Apart
DC Controller Board - 95
1
2
3
Disconnect J103 from the power supply.
Remove the all cables except for the engine interface
cable and power supply connector TB201.
Note: Do not attempt to remove connector TB201 from
the DC controller board. Connector TB201 is hardwired to the board.
Release the two flex tabs and pull the board out of the
printer.
Replacement Note: Set the bottom edge of the board into
the two mounts and then snap the top into place. Make
sure that the positioning posts line up with the holes in
the board.
Note: Perform the “Registration Adjustment”
procedure (see Additional Procedures).
Take Apart
Power Supply - 96
Power
Supply
Power Supply
Before you begin, remove
the following:
• Rear panel
• I/O board
• I/O shield
Take Apart
Power Supply - 97
1
2
Note: Three screws secure the power supply to the
chassis—one on the left side of the printer beneath the
power inlet panel and two on the rear side.
Pull off the power inlet panel that covers the main
power switch and remove the three screws.
Note: There is a receptacle on the rear face of the power
supply. The receptacle mates with the high-voltage
connector block and may cause slight resistance when
you are pulling out the power supply.
Remove connectors J103 and J104 and pull out the
power supply.
Take Apart
Main Motor - 98
Main
Motor
Main Motor
Before you begin, remove
the following:
• Rear panel
• I/O board
• I/O shield
• Power supply
Note: The main motor is the
motor mounted next to the
DC controller board. The
main motor powers the
drive train from the toner
cartridge forward through
the delivery rollers. See
“Mechanical Drive Theory”
in Basics.
Take Apart
Main Motor - 99
1
2
Remove the four brass colored screws that secure the
motor to the printer chassis.
Disconnect J131 from the main motor board and pull out
the main motor.
Take Apart
Drive Assembly - 100
Drive Assembly
Drive Assembly
Before you begin, remove
the following:
• Fuser assembly
• Rear panel
• I/O board
• I/O shield
• Power supply
• Main motor
Note: The drive assembly
receives drive from the
main motor and transfers it
forward to the fuser
assembly gears. See
“Mechanical Drive Theory”
in Basics.
Take Apart
Drive Assembly - 101
1
2
3
Remove the two small silver-colored screws on the rear
face of the chassis that secure the drive assembly to the
printer.
Note: The following step dislodges the positioning pins
that seat into the chassis wall.
Grip the edge of the assembly housing with needlenose
pliers and pull it about 1/4 inch away from the chassis
wall.
Pull the drive assembly out the fuser side of the printer.
Take Apart
Power Supply Fan - 102
Power Supply Fan
Power Supply Fan
Before you begin, remove
the following:
• Rear panel
• Top cover
• I/O board
• I/O shield
• Delivery roller assembly
Take Apart
Power Supply Fan - 103
1
2
3
Remove the single inch-long screw that connects the
metal bracket to the fan and fan duct and lift off the metal
bracket.
Disconnect J209 from the DC controller board.
Using a small flat-blade screwdriver, release the four
tabs and lift the fan out of the printer.
Take Apart
Controller Board Fan - 104
Controller Board
Fan
Before you begin, remove
the following:
• Rear panel
• I/O board
• I/O shield
• Right corner panel
Controller
Board Fan
Take Apart
Controller Board Fan - 105
1
2
Remove the single inch-long screw that connects the fan
to the metal chassis.
Disconnect J214 from the DC controller board, thread
the cable through the fan bracket, and remove the fan
from the printer.
Replacement Caution: Be sure to reinstall the fan with
the label facing outward.
Take Apart
Internal
Fan
Internal Fan - 106
Internal Fan
Before you begin, remove
the following:
• Rear panel
• I/O board
• I/O shield
• Top cover
• Delivery roller assembly
Take Apart
Internal Fan - 107
1
2
Remove the single screw that connects the fan to the
metal chassis.
Disconnect J213 from the DC controller board, slide the
slightly to the right, and remove the fan from the
printer.
Take Apart
High-Voltage Power Supply - 108
High-Voltage
Power Supply
No preliminary steps are
required before you begin
this procedure.
Note: The high-voltage
power supply receives
power from the high-voltage
connector block and
transfers it into the toner
cartridge through contacts
TB401 to TB406.
High-Voltage
Power Supply
Remove the high-voltage
power supply from its tray
before returning the high-
Take Apart
High-Voltage Power Supply - 109
voltage power supply to Apple.
1
Turn over the printer.
3
Note: There are three hidden contacts and a pin
connector that mate with the high-voltage connector
block. They may cause slight resistance when you are
performing this procedure.
2
Remove the two screws that secure the high-voltage
power supply to the bottom chassis.
Release the two flex tabs and pull the high-voltage power
supply out of the printer.
Replacement Note: Make sure that the contacts and
connectors are firm. Run a service test page after replacing
the high-voltage power supply. If you get a solid black page,
you have probably not seated the high-voltage power supply
correctly.
Take Apart
High-Voltage Connector Block - 110
High-Voltage
Connector Block
Before you begin, remove
the following:
• Rear panel
• I/O board
• I/O shield
• Power supply
• Fuser door
• Fuser assembly
• High-voltage power
supply
Ê
High-Voltage
Connector Block
Take Apart
High-Voltage Connector Block - 111
1
2
3
4
5
Remove the screw that secures the right cassettte guide
to the fuser end of the printer.
Note: The tab referenced in the following step is
accessible from behind the rear wall of the chassis.
Release the single flex tab with your finger and shimmy
the cassette guide off the printer.
Disconnect J210 (the orange cabling) from the DC
controller board.
Release the expansion posts behind the receptacle that is
anchored into the chassis wall, detach the receptacle, and
push the receptacle back through the chassis opening.
Release the flex tab near the cable tie and receptacle and
remove the connector block from the printer.
Take Apart
High-Voltage Connector Block - 112
Keyed
Receptacle
Notch
Replacement Note: The
cable receptacle is keyed and
will not mate with the power
supply if it is installed
incorrectly. Looking from
the rear of printer, with the
printer sitting upright, the
notched corner should be at
the upper left.
Take Apart
Paper Pickup Block - 113
Paper Pickup
Block
Before you begin, remove
the following:
• Rear panel
• Top cover
• Front panel
• Right corner panel
• Multipurpose tray assy
• Multipurpose closure
panel
Paper Pickup Block
Take Apart
Paper Pickup Block - 114
Note: Refer to the following take-apart topics for
disassembly of the paper pickup block:
– Pickup Controller Board
– Pickup Sensor Board
– Pickup Block Motor
– Envelope Feeder Cable
– Sensor Holder Assembly
– Left Pickup Block Frame
Note: The paper pickup block is not available from Apple as
an intact module.
1
2
Remove the three brass-colored screws on the front
chassis.
Remove the two screws that secure the lateral brace to
the chassis and lift off the brace.
Take Apart
Paper Pickup Block - 115
3
4
5
Remove the two screws that secure the right edge of the
pickup block to the chassis.
Disconnect the two cables from the exposed edge of the
pickup controller board.
Grasp the pickup block and slide it out of the printer.
Replacement Note: Perform the “Registration Adjustment”
procedure (see Adjustments chapter).
Take Apart
Pickup Controller Board - 116
Pickup Controller
Board
Pickup
Controller
Board
Pickup Block
Before you begin, remove
the following:
• Rear panel
• Top cover
• Front panel
• Right corner panel
• Multipurpose tray assy
• Multipurpose closure
panel
• Paper pickup block
Note: Control of the
following parts either
routes through or is located
on the pickup controller
Take Apart
Pickup Controller Board - 117
board:
– Pickup sensor board
– Pickup motor and drive gears
– Top cover interlock switch
– Service test page button
– Cassette and envelope feeders
– Cassette microswitches
– Cassette paper sensor
1
2
Disconnect the two cables and remove the two screws
that secure the board to the pickup block.
Caution: The top cover interlock actuator is not attached
to anything. Once you remove the board, the actuator can
fall out and is difficult to find.
Release the tabs from top to bottom and pull out the
board. There is a pin connector on the hidden face of the
board that may cause slight resistance as you remove the
board.
Take Apart
Pickup Sensor Board - 118
Pickup Sensor
Board
Pickup
Sensor
Board
Pickup Block
Before you begin, remove
the following:
• Rear panel
• Top cover
• Front panel
• Right corner panel
• Multipurpose tray assy
• Multipurpose closure
panel
• Paper pickup block
• Pickup controller board
Note: Control of the
following parts either
routes through or is located
Take Apart
Pickup Sensor Board - 119
on the pickup sensor board:
– Multipurpose feed
sensor
– Cassette feed sensor
– Pickup motor and drive
gears
– Pickup solenoids
1
2
3
Turn over the pickup
block so that it is resting
on the 45° face of its end
frames.
Unhook the three tabs
and snap off the sensor
board cover.
Disconnect the three
cables at the gear end of
the board.
Take Apart
Pickup Sensor Board - 120
4
Note: In the following instruction, “left” is the gear end
and “right” is the controller board end of the pickup
block.
Raise the board slightly to clear the two positioning
pins, shift it about 1/2 inch to the left, rotate the right
end upward, and remove the sensor board from the paper
pickup block.
Take Apart
Pickup Block Motor - 121
Pickup Block
Motor
Before you begin, remove
the following:
• Rear panel
• Top cover
• Front panel
• Right corner panel
• Multipurpose tray assy
• Multipurpose closure
panel
• Paper pickup block
Pickup
Block
Motor
Pickup Block
Note: The pickup block
motor is the motor mounted
in the left pickup block
frame. The pickup block
Take Apart
Pickup Block Motor - 122
motor powers the drive train from paper pickup forward to
the toner cartridge. See “Mechanical Drive Theory” in
Basics.
1
2
3
Disconnect the middle cable from the pickup sensor
board.
Remove the pickup block motor cabling from the entire
length of its retaining channel.
Remove the two long brass-colored screws that secure
the motor to the pickup block and lift out the motor.
Take Apart
Cassette Pickup Roller - 123
Cassette Pickup
Roller
No preliminary steps are
required before you begin
this procedure.
Cassette Pickup
Roller
Pickup Block
Take Apart
Cassette Pickup Roller - 124
1
2
Turn over the printer
and locate the cassette
tray pickup roller.
Squeeze the spring
release at the end of the
roller shaft and slide off
the pickup roller.
Replacement Note: Make
sure that the roller
slides all the way in on
the shaft and locks into
place.
Take Apart
Multipurpose Pickup Roller - 125
Multipurpose
Pickup Roller
Before you begin, remove
multipurpose closure panel.
1
Multipurpose
Pickup Roller
Pickup Block
Squeeze the spring
release at the end of the
roller shaft and slide off
the pickup roller.
Replacement Note: Make
sure that the roller
slides all the way in on
the shaft and locks into
place.
Take Apart
Separation Pad - 126
Separation Pad
Before you begin, remove
the following:
• Multipurpose closure
panel
• Multipurpose pickup
roller
Separation Pad
Pickup Block
Note: The separation pad is
available as a part of the
multipurpose tray guide
assembly (P/N 9220286). Remove the
separation pad from the new
tray guide assembly and
install it in the printer.
Take Apart
Separation Pad - 127
1
Using a small flat-blade screwdriver, pry underneath
the bottom edge of the separation pad and remove the pad.
Take Apart
Envelope Feeder Cable - 128
Envelope Feeder
Cable
Envelope
Feeder
Cable
J136
Pickup Block
Before you begin, remove
the following:
• Rear panel
• Top cover
• Front panel
• Right corner panel
• Multipurpose tray assy
• Multipurpose closure
panel
• Paper pickup block
• Pickup controller board
Take Apart
Envelope Feeder Cable - 129
1
Remove the cabling from the entire length of its
retaining channel in the right pickup block.
Note: If you are replacing the feeder cable without replacing
the feeder cable mount, skip to step 7.
2
3
Note: The opening guide is the rounded metallic plate
with the green knob at its far end. The opening guide
hinges around a ring connection at the knob end and an
open grip connection at the near end.
Swing the opening guide upward about 90°, free the grip
connection, and pull the guide up and out of the pickup
block.
Disconnect the grounding spring from the pickup block.
Take Apart
Envelope Feeder Cable - 130
4
Note: The upper tray
guide is the black piece
below the opening
guide. It has a rounded
cutout on its far side that
serves as a grip point
for the step below. A
flex tab and two posts
are located at the
controller end of the
upper tray guide.
Release the flex tab,
shift the upper tray
guide to clear the posts,
and lift the guide out of
the pickup block.
Take Apart
Envelope Feeder Cable - 131
5
6
7
Remove the screw that
secures the cable mount
to the pickup block
frame.
Rotate the cable mount
outward to free the two
mounting tabs and
remove it from the
pickup block.
Release the expansion
posts behind the
receptacle and remove
the envelope feeder cable
from the cable mount.
Take Apart
Sensor Holder Assembly - 132
Sensor Holder
Assembly
Sensor
Holder
Assembly
Pickup Block
Before you begin, remove
the following:
• Rear panel
• Top cover
• Front panel
• Right corner panel
• Multipurpose tray assy
• Multipurpose closure
panel
• Paper pickup block
• Cassette pickup roller
Note: The sensor holder
assembly contains the
cabling, actuators, and photo
Take Apart
Sensor Holder Assembly - 133
interrupters for cassette paper sensor PS601 and
registration paper sensor PS602.
1
2
Rest the entrance side of the pickup block flat on your
work surface.
Disconnect J605 from the pickup controller board.
Take Apart
Sensor Holder Assembly - 134
3
Note: The sensor holder
assembly is held in place
by a positioning post at
the far end and two pairs
of tab connectors at the
near end.
Press the positioning
post through the metal
flange and grasp the
throat of the pin with
needlenose pliers.
Take Apart
Sensor Holder Assembly - 135
4
Note: Pull the sensor holder assembly toward the gear
end of the pickup block while you perform the following
step.
Release the two tabs, unmount the holder assembly, and
shimmy it out of the pickup block.
Take Apart
Left Pickup Block Frame - 136
Left Pickup Block
Frame
Before you begin, remove
the following:
• Rear panel
• Top cover
• Front panel
• Right corner panel
• Multipurpose tray assy
• Multipurpose closure
panel
• Paper pickup block
Left Pickup
Block Frame
Pickup Block
Note: Removal of the left
frame is necessary only if
you need to get to some of the
components on the inside
Take Apart
Left Pickup Block Frame - 137
face of the frame, such as the feed rollers, gear mount, or
the sensor arm. You must also remove the left frame to get
the paper guide plate and its spring out of the pickup block.
The Take Apart procedures do not address disassembly
beyond this topic.
1
2
3
Set the pickup block on end with the left frame up.
Remove the two black and two silver-colored screws
that connect the frame to middle components.
Lift the left frame straight up and off the pickup block.
Note: The inside of the frame is now accessible for further
troubleshooting or take apart
Take Apart
Left Pickup Block Frame - 138
Replacement Note: The key
step in reassembly is
correctly installing the
paper guide plate and its
spring. The guide plate
presses against the gear
that drives the multipurpose
pickup roller. If the plate
does not press against this
gear, the pickup roller will
either slip or remain in
neutral and no paper will be
pulled into the printer from
the multipurpose tray. Your
drum shaft end plate may
differ from what is shown.
Take Apart
Left Pickup Block Frame - 139
Reinstall the lower guide (the flexible guide with ribs)
after the pickup block is intact. Temporarily loosen the
four screws on the right block frame and release the frame
about 1/8 inch to allow for the reseating of the lower guide.
Take Apart
Transfer Roller - 140
Transfer Roller
No preliminary steps are
required before you begin
this procedure.
Transfer Roller
Take Apart
Transfer Roller - 141
1
Hook the left end of the
roller with the green
cleaning brush and pull
the roller out of the
printer.
Replacement Note: Slide
the right end of the
roller into the slot and
lower the gear end into
place.
Transfer Roller
Take Apart
Transfer Guide Assembly - 142
Transfer Guide
Assembly
Before you begin, remove
the following:
• Rear panel
• Top cover
• Front panel
• Right corner panel
• Multipurpose tray assy
• Multipurpose closure
panel
• Paper pickup block
Transfer Guide Assembly
Take Apart
Transfer Guide Assembly - 143
1
Remove the two black screws that secure the transfer
guide assembly to the toner cartridge guides and pull the
transfer guide assembly out the right side of the printer.
Take Apart
Transfer Block Assembly - 144
Transfer Block
Assembly
Before you begin, remove
the following:
• Rear panel
• Top cover
• Front panel
• Right corner panel
• Multipurpose tray assy
• Multipurpose closure
panel
• Paper pickup block
• Transfer guide assembly
• Fuser assembly
Transfer Block Assembly
Ê
Take Apart
Transfer Block Assembly - 145
1
2
3
4
For clearance purposes, loosen the nine silver-colored
screws and the one upper black screw about 1/8 inch
and shift the front wall outward.
Remove the screw facing out through the fuser door that
secures the feeder guide to the chassis.
Pry under the toner-side edge of the assembly with a
small flat-blade screwdriver and release the five tabs
that secure the transfer block assembly to the chassis.
Note: The underside of the transfer block assembly has
several contact pins that extend down into the highvoltage power supply and tend to snag during removal.
Be careful not to damage them as you perform the
following step.
Lift the assembly straight upward about 2 inches and
shimmy it out the toner side of the printer.
Take Apart
Envelope Feeder - 146
Envelope Feeder
Before you begin, remove
the multipurpose closure
panel.
Note: Refer to the Envelope
Feeder LW Pro-LW 16/6
manual for further
information.
1
Envelope Feeder
To install the envelope
feeder, turn off the
printer, slide the feeder
into the paper pickup
block, and turn on the
printer.
Take Apart
Sheet Feeder - 147
Sheet Feeder
No preliminary steps are
required before you begin
this procedure.
Note: Refer to the Sheet
Feeder LW Pro-LW 16/6
manual for further
information.
1
Sheet Feeder
To install the sheet
feeder, turn off the
printer, place the
printer in position over
the feeder and lower the
printer into position.
Then turn on the
printer.
K Service Source
Upgrades
LaserWriter 16/600 PS
Upgrades
Upgrading RAM - 1
RAM SIMMs
I/O Controller Board
BA DC
Upgrading RAM
There are two RAM SIMM
slots on the LaserWriter
16/600 PS I/O controller
board, slot BA on the left and
slot DC on the right.
The printer comes with 8
MB of RAM installed in slot
BA. You can increase the
printer memory to a total of
32 MB by installing RAM
SIMMs in one of the
configurations shown on the
next page.
Upgrades
Upgrading RAM - 2
Caution: The SIMMs are very susceptible to ESD damage. To
prevent damage, wear a grounding wriststrap. Review the
ESD precautions in Bulletins/Safety.
Table 1: RAM Configurations
Total
Slot BA
Slot DC
Note
8 MB
8 MB
(empty)
b
16 MB
8 MB
8 MB
12 MB
24 MB
32 MB
a
8 MB
16 MB
16 MB
4 MB
8 MB
16 MB
c
d
e
No other configuration is supported. If you try to
install a (16 + 0 = 16) or (16 + 4 = 20)
configuration, for example, you are likely to
Upgrades
Upgrading RAM - 3
b
c
d
e
f
receive an engine error when you start up the
printer.
This is the standard, as-shipped configuration.
The is the minimum configuration to enable
PhotoGrade.
Note that this configuration requires moving the
base 8 MB SIMM from the left to the right SIMM
socket. Due to mechanical constraints, the left
SIMM should always be installed before the right
SIMM is installed.
Return the original 8 MB SIMM to the customer.
See next page for RAM specifications.
Upgrades
Upgrading RAM - 4
RAM SIMM Specifications
Length: 107.95 mm ± 0.20 mm (4.25 in. ± .008)
Height: 25.53 mm (1.005 in.) maximum
4 MB SIMM:
1 Mbit x 32 bit (one 4 MB bank)
80 ns or less
72-pin
8 MB SIMM:
2 Mbit x 32 bit (two 4 MB banks)
80 ns or less
72-pin
16 MB SIMM:
4 Mbit x 32 bit (one 16 MB bank)
80 ns or less
72-pin
Upgrades
Upgrading RAM - 5
Note: 16 MB SIMMs must have a 2 KB row (11 bit x 11
bit) refresh configuration. 16 MB SIMMs with a 4 KB row
(10 bit x 12 bit) refresh configuration are not compatible
with this printer.
Upgrades
Adding a Fax Card - 6
Adding a Fax Card
Fax Card
J15
(on I/O Board)
Screw
Ghosted image is outline of I/O controller board.
There are two fax cards
available for the
LaserWriter 16/600 PS,
one for USA and one
international. Install the
fax card in accordance with
the instruction in the user
guide.
The fax card mates into
connector J15 on the I/O
board. One screw connects
the fax card to a sheet metal
flange on the I/O shield. The
fax port aligns with a pinout
opening in the I/O shield.
Upgrades
Adding a Fax Card - 7
The domestic fax card has an on-board modem and an RJ-11
phone net port for direct connection into phone lines. The
finished goods part number for the domestic fax card is
M3298LL/A.
The international fax card has a serial port for direct
connection into an external modem. The finished goods part
number for the international fax kit is M3299*/A.
Upgrades
Adding Hard Drives - 8
Internal
Hard Drive
Barcode
Label
Ghosted image is outline of I/O controller board.
External SCSI Connector
Adding Hard
Drives
You can install one internal
hard drive and attach up to
six external SCSI hard
drives to the LaserWriter
16/600 PS.
Internal hard drives
You can purchase an optional
internal SCSI hard drive for
the LaserWriter 16/600
PS. The finished goods part
number for the internal
hard drive is M3297G/A.
Upgrades
Adding Hard Drives - 9
The internal drive mounts directly onto the printer’s I/O
board using the three captive screws attached to the carrier.
Note: When installing the hard drive, check the I/O serial
number on the yellow barcode label in the upper right-hand
corner of the I/O controller board. If the last four
characters of the number are “34AA,” do not install the
hard drive and return the I/O controller board to Apple. If
the last four characters are not 34AA,” continue installing
the hard drive according to the instructions that come with
the hard drive kit.
External hard drives
You must use an HDI-30 SCSI System cable and SCSI
terminator to connect a hard drive to the printer. The
terminator can be either black or gray. Each SCSI device
connected to the printer must have a different number. Do
Upgrades
Adding Hard Drives - 10
not use SCSI ID #7 or ID #0.
Caution: External hard drives must supply 5 volts DC to the
SCSI bus to work properly. Check the documentation that
came with the hard drive for information about SCSI voltage.
The printer will not recognize any attached drive unless the
drive is turned on before or at the same time that you start
up the printer. If a hard drive is left off, the printer will
detect an error and will not start up.
Previously used drives
The LaserWriter 16/600 PS will not recognize any disks
that have been formatted for use with a different model of
LaserWriter or Macintosh. If you attach such a drive to the
printer, you must reinitialize the drive before you can use
it and then reload any fonts from your computer.
Upgrades
Adding Hard Drives - 11
Note: You must initialize hard drives with the Apple
Printer Utility (for Macintosh) or the Font Downloader in
the Printer Setup dialog box (for Windows). If your
computer communicates with the printer via DOS or a UNIX
network, refer to the LaserWriter 16/600 PS user manual.
Upgrades
IOP ROM v. 3.0 - 12
I/O Controller Board
IOP ROM
IOP ROM v. 3.0
Several network-oriented
symptoms are addressed by
version 3.0 of the Input/
Output Processor (IOP)
ROM. This ROM is available
as P/N 922-2458.
Note: Version 2.0 of the IOP
ROM has been discontinued.
All fixes associated with that
version are present in v3.0.
Upgrades
IOP ROM v. 3.0 - 13
Note: The LaserWriter 16/600 PostScript ROMs are not
affected by this IOP upgrade. The current version is v1.0.
Rev PS: 1.0 I/O: 2.1
Determining IOP ROM Version
Along the right edge of the startup page is a small line of text
that reads Rev PS: 1.0 I/O: XX. The number represented
here as XX is the version of IOP ROM currently installed in
that printer.
Upgrades
IOP ROM v. 3.0 - 14
Symptoms Associated with IOP ROM
Ethernet lockups
In version 1.0 of the IOP ROM, reception of an illegally sized
packet greater than 1518 bytes caused the IOP to stop
responding to network traffic. (Restarting the printer may
temporarily resolve this problem.) This problem was
resolved in IOP v2.0 and later.
Customers should upgrade their IOP ROM to v3.0.
Upgrades
IOP ROM v. 3.0 - 15
AppleTalk problems
The following problems have been fixed with version 3.0 of
the IOP ROM.
• The printer’s EtherTalk stack stops responding during
or after a broadcast storm (i.e. the printer disappears
from the EtherTalk network even though TCP/IP and IPX
continues to function.)
• Helios EtherShare Print Server does not print with the
EtherShare Accounting feature on.
• The printer registers on the network with an
enumerated name even if there were no other printers in
that zone with the same name. This was caused by the
printer temporarily registering in the default zone
(where a similarly named printer does exist) prior to
registering in its proper zone.
• The printer appears in a different zone than the one set
with the Apple Printer Utility. This was caused by the
Upgrades
IOP ROM v. 3.0 - 16
printer accepting and storing in NVRAM an invalid ZIP
GetNetInfo response. It no longer stores this value in
NVRAM. If the connection with the router is lost and
current zone is the default, the printer will return to
the zone stored in NVRAM as set by the Apple Printer
Utility.
• EtherTalk now stores its current network number in
VRAM and uses this number as its first guess on startup.
• On very slow WAN network links, connections may have
timed out.
• The error recovery algotithm for Open Connection
transactions has been enhanced.
Upgrades
IOP ROM v. 3.0 - 17
The Apple LaserWriter 16/600 PS can be seen in the
Chooser, but you cannot print to it.
Restarting the printer may temporarily resolve this issue.
Please note that the printer may require another solution
instead, as similar symptoms may be caused by some
versions of printer drivers or routers. If the problem
persists after restarting the printer, try the following:
• The symptom may be caused by earlier versions of the
LaserWriter 8.x drivers. Upgrade to LaserWriter 8.2.2
or later driver software.
• Similar symptoms are caused by a Name Binding
Protocal (NBP) gleaning bug in some routers, including
Cisco routers and the Apple Internet Router 3.0. To work
around this problem with Cisco routers, upgrade the
Cisco software to v10.2 or later or turn NBP gleaning
off. To work around this problem with an Apple Internet
Router, update the Ethernet driver with Network
Upgrades
IOP ROM v. 3.0 - 18
Software Installer 1.5 or later. Both these routers
induce the symptoms only under specific circumstances.
Note: LaserWriter driver or gleaning bugs are not
specific to the LaserWriter 16/600 PS printer. Other
printers or devices may also be affected.
If none of the suggestions above is effective, upgrade the IOP
ROM to v3.0.
Upgrades
IOP ROM v. 3.0 - 19
The LaserWriter 16/600 PS is not visible on networks
routed by Dayna PathFinder Routers.
This symptom is caused by the LaserWriter 16/600 PS
booting with a source network of 1 and the PathFinder not
asserting itself to tell the printer what network range it
should be in (most likely a number other than 1). In turn,
the PathFinder won’t respond to the printer’s request for
zone information, resulting in devices not being able to
locate the printer.
Other symptoms may occur when multiple routers exist in
addition to the Dayna PathFinder (including not being able to
locate the printer in the Chooser, not being able to open a
connection with the Chooser, and receiving PostScript
errors when printing). A network trace may reveal that the
PathFinder is not responding to the printer’s Zone
Information Protocal/Get Net Info (ZIP GNIs).
Upgrades
IOP ROM v. 3.0 - 20
The symptoms above are addressed in the v3.0 IOP ROM.
Service Providers should replace the ROM.
The LaserWriter 16/600 PS is slow when using Farallon
PhoneNET Star Controllers.
When a LaserWriter 16/600 PS is connected to a Farallon
PhoneNET StarController, print jobs sent to the printer
take a long time to print (typical) or may fail (rare) with
PostScript errors. The reason for this symptom is that the
LaserWriter 16/600 PS begins transmitting prematurely
after receiving the Star Controller's LocalTalk Link Access
Protocal (LLAP) packet.
This symptom is addressed in the v3.0 IOP ROM. Service
Providers should replace the ROM.
Upgrades
IOP ROM v. 3.0 - 21
IOP Does Not Close Jobs Correctly
The IOP does not close jobs correctly (e.g., when a
PostScript error is encountered) without an End of File
(EOF) message; a second job following the first gets flushed
by the PostScript interpreter (to the second job’s EOF), so
neither the first job having the error nor the second job
prints. A third job will print fine.
This symptom is addressed in the v3.0 IOP ROM. Service
Providers should replace the ROM.
Upgrades
IOP ROM v. 3.0 - 22
Symptoms Not Associated with IOP ROM
Note: The following issue is not related to the IOP ROM.
The LaserWriter 16/600 PS returns to the default zone
after being turned on.
The configuration switch on the LaserWriter 16/600 PS
must be in the up position if you want zone changes made
with the Apple Printer Utility to be persistent across power
cycles.
K Service Source
Adjustments
LaserWriter 16/600 PS
Adjustments
Registration Adjustment - 1
Leading Edge of Paper
Registration
Adjustment
Leading Edge
Registration
Distance
Test Page Pattern
Before you begin, remove
the following:
• Rear panel
• Top cover
You must perform the
registration adjustment
procedure whenever you
replace the DC controller
board, paper pickup block,
or the laser/scanner
assembly.
The DC controller board
calculates registration based
Adjustments
Registration Adjustment - 2
on input from registration paper sensor PS602 (see
“Sensing System Theory” in Basics) and adjustments made
to varistor VR201 on the DC controller board.
Optimum leading edge registration distance is 2 mm.
Adjustments
Registration Adjustment - 3
1
+10
-10
+8
-8
+6
-6
-4
+4
+2
Clockwise (+)
0
-2
Counterclockwise (-)
VR201
DC Controller Board
2
3
Using a jeweler’s
screwdriver, reset
VR201 on the DC
controller board to “0.”
Switch on the printer
and wait for the printer
to warm up.
Press the service test
page button three times
to make three service
test pages.
Adjustments
Registration Adjustment - 4
4
Leading Edge
Registration
Distance
Test Page Pattern
Three Test Pages
5
Measure the distance
from the top of each page
to the edge of the printed
test page pattern.
Calculate the average
distance by adding the
three measurements and
dividing by three.
Adjustments
Registration Adjustment - 5
(-) Counterclockwise
(Avg. distance > 2.0 mm)
Correction
Distance
(mm)
VR201
Setting
-0.60
-2
-0.30
-1
-0.90
-3
-1.21
-1.51
-1.81
-2.11
-2.41
-2.71
-3.02
-4
-5
-6
-7
-8
-9
-10
(+) Clockwise
(Avg. distance < 2.0 mm)
Correction
Distance
(mm)
VR201
Setting
+2.71
+9
+3.02
+10
+2.41
+8
+2.11
+1.81
+1.51
+1.21
+0.90
+0.60
+0.30
+7
+6
+5
+4
+3
+2
+1
6
7
Adjust VR201 so that the
average value becomes
2.0 mm (see the table to
the left).
Note: For example, if
your average distance is
2.6 mm, the difference
is 0.6 mm and you
should set VR201 to a
setting of +2.
Print three more test
pages. If the average
registration distance is
not 2.0 mm, repeat this
procedure.
K Service Source
Exploded View
LaserWriter 16/600 PS
Exploded View
1
Overall Exploded View
16/600PS Exploded View
Panel Power
Inlet
922-0941
Fuser
Access Door
922-0233
Top Cover
Assembly
922-0234
Rear Panel
922-0942
Fuser
Assembly
661-0091 (110/115 V)
661-0092 (220/240 V)
Cover Liner
922-0229
Fan-Power
Supply Assembly
922-0944
I/O Shield
(not offered)
I/O Board
661-0090
Delivery
Roller
Assembly
922-0292
Main
Motor
922-1946
Laser/Scanner
Assembly
661-0093
Internal Fan
922-0947
DC Controller Board
661-0094
Power Supply
661-0097 (110 V)
661-0098 (220 V)
Delivery/
Interlock
Sensor
922-0299
Transfer Block Assembly
922-0267
Fan Controller
Board
922-0948
Right Corner Panel
922-0940
Drive
Assembly
922-0950
Chassis
HVPS
Connecting
Block
922-0268
High-Voltage
Power Supply
661-0096
Cable Printer
Interface
922-0139
Pickup Controller
Board
922-0952
Closure Panel
922-0253
Transfer Roller 922-0949
Transfer Guide Assembly
(not offered)
Las
e
16/6rWrite
00 r
PS
Front
Panel
922-1126
Paper Pickup Block
661-0123– Pickup Controller Board
922-0208– Pickup Sensor Board
922-0953– Pickup Block Motor
076-0478– Drive Gears Kit
076-0674– Pickup Block
Piece Parts Kits
922-0289– Sensor Holder Assembly
922-0276– Left Pickup Block Frame
Pickup
Roller
Cassette
922-0951
16/600PS Exploded View
Pickup Roller
Multipurpose
922-0281
Multipurpose Tray
Assembly
922-0227
Exploded View
2
Delivery Roller Assembly Exploded View
Upper
Delivery
Guide
Delivery
Drive
Belt
DELIVERY ROLLER ASSEMBLY
Take-Apart
Upper Delivery Roller Shaft
Lower Delivery Roller Shaft
Exploded View
3
Fuser Assembly Exploded View
FUSER ASSEMBLY
Take-Apart
Upper Frame
Connector Cable
Thermoprotector
Thermosensor
Left Cover Cap
Left Cover
Cable Cover
Heater Bulb
Right Cover
DeliverySensing
Lever
Exploded View
4
Pickup Block Exploded View
Envelope Feeder Cable
Pickup Controller Board
Sensor Holder Assy
PAPER PICKUP BLOCK
Take-Apart
Pickup Block Motor
Left Frame
Separation Pad
Pickup
Sensor
Board