Apple Laserwriter Pro 600, Laserwriter Pro 630 Service Manual

K

Service Source

LaserWriter Pro 600/630

LaserWriter Pro 600, LaserWriter Pro 630

K

Service Source

Basics

LaserWriter Pro 600/630

Basics Product Information - 1

Product Information

The printers covered in this
manual are the LaserWriter
Pro 600 and LaserWriter
Pro 630. Except for the I/O
boards, all parts are
identical between the two
models.

Basics Product Information - 2

Note:

Refer to the following chapters in the Envelope Feeder
LW Pro-LW 16/6 and Sheet Feeder LW Pro-LW 16/6
manuals for additional information on feeder options.

– Take-Apart
– Additional Procedures
– Adjustments
– Illustrated Parts

Basics LaserWriter Utility - 3

LaserWriter Utility

Note:

Refer to the user's guide for complete information
regarding LaserWriter Utility. This application gives you
software control over the LaserWriter Pro that is essential
to its operation. Some of features of LaserWriter Utility
include:

– Naming the printer
– Setting default printer resolution
– Turning on FinePrint
– Turning on PhotoGrade (if available)
– Setting default paper-handling options
– Setting print density
– Setting communication protocols
– Printing configuration page
– Turning off the startup test page

Note:

You must use LaserWriter Utility version 7.4 or

Basics LaserWriter Utility - 4

later. You can override some default settings through the
Print dialog (LaserWriter driver version 7.2 or later).

Basics Paper Path - 5

Paper Path

There are four paper

Optional

*

Standard
Cassette (250)

Optional Sheet
Feeder (500)

Envelope
Feeder (75)

Multipurpose
Tray (100)

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 - 6

Mechanical Drive

M1

M3

M2

M4

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 - 7

M1 Main Motor Drive

Power

Supply

Toner Cartridge

Transfer Roller

DC Controller Board

Connecting Cable

Main Motor

Drive Assembly

D

Fuser Assembly

Gears/Rollers

E

Delivery Roller Assy

Gears/Belt/Rollers

A

The main motor powers the
system that transports
paper from the toner
cartridge to the delivery
tray on top of the printer.

B

Note:

The letters next to the
boxes correspond to the

C

labels in the mechanical
drive animations that are
available on the CD.

F

G

Basics Mechanical Drive Theory - 8

M2 Pickup Block Motor Drive

Power

Supply

DC Controller Board

Connecting Cable

Pickup Controller Board

A

The pickup block motor
powers the system that
transports paper into the
engine, through the pickup

H

block, and up to the toner
cartridge.

Pickup

Solenoids

Pickup Sensor Board

Pickup Block Motor

Gear/Roller System

J

Note:

The DC controller
board does not connect

K

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 Mechanical Drive Theory - 9

M3 Sheet Feeder Motor Drive

Power

Supply

ENGINE

SHEET FEEDER

DC Controller Board

Connecting Cable

Pickup Controller Board

Connecting Cable

Controller Block

Feeder Controller Board

Sheet Feeder Motor

A

The sheet feeder motor
powers the system that
transports paper from the

H

500-sheet cassette upward
into the printer engine.

Note:

Once the paper

L

reaches the lower feed
roller in the pickup block,

M

engine components supply
mechanical drive.

N

Pickup

Solenoid

Gear/Roller System

Basics Mechanical Drive Theory - 10

Power

Supply

ENGINE

ENV FEEDER

Pickup

Rollers

DC Controller Board

Connecting Cable

Pickup Controller Board

Connecting Cable

Connecting Cable

Feeder Controller Board

Feeder Controller Board

Envelope Feeder Motor

Drive Assembly

Primary Feed Roller

Separation Drive Assy

A

M4 Envelope Feeder Motor Drive

The envelope feeder motor

H

O

P

Q

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 - 11

Sensing System Theory

There are six paper sensors, one dual-purpose sensor, and
seven sensing switches in a LaserWriter Pro 600/630 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 - 12

– •SW604: Upper Cassette Size Sensing Switch
– •SW605: Upper Cassette Size Sensing Switch
– •SW851: Lower Cassette Size Sensing Switch
– •SW852: Lower Cassette Size Sensing Switch
– •SW853: Lower Cassette Size Sensing Switch

Basics Sensing System Theory - 13

Actuator

OPEN

CLOSED

Photointerrupter

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 - 14

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 - 15

PS601

Cassette Paper Sensor

Actuator: A passive lever in
the sensor holder assembly
is tripped by insertion of a
loaded cassette tray.

Sensor

Holder

Assembly

PS601

Paper

Pickup Block

Basics Sensing System Theory - 16

PS602

Registration Paper Sensor

Actuator: A spring-loaded
lever in the sensor holder
assembly is tripped by
arriving paper.

Sensor

Holder

Assembly

PS602

Paper

Pickup Block

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 - 17

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 - 18

PS702

Multipurpose Paper­Present Sensor

Actuator: A spring-loaded
lever in the paper pickup
block is tripped by the

Pickup

Sensor

Board

PS702

Paper

Pickup Block

leading edge of paper as it is
loaded in the multipurpose
tray.

Basics Sensing System Theory - 19

PS701

Multipurpose Paper-End
Sensor

Actuator: A passive lever in
the paper pickup block is
tripped by the trailing edge

Pickup

Sensor

Board

PS701

Paper

Pickup Block

of paper leaving the
multipurpose tray.

Sensor PS701 detects the
size of paper fed from the
multipurpose tray.

Basics Sensing System Theory - 20

PS201

Delivery/Interlock Sensor

Actuator: A plastic tab on
the fuser door and a sensing
lever in the fuser assembly

Delivery/Interlock Sensor

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 - 21

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 - 22

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 - 23

PS931

Envelope Feeder Paper­Present Sensor

Actuator: A spring-loaded
lever is tripped by
placement of envelopes into
the feeder.

Basics Sensing System Theory - 24

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 - 25

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 - 26

SW601

Top Cover Interlock Switch

Actuator: A tab on the top
cover actuates a leaf spring

Cover Interlock Arm

Cover Interlock Spring

Cover Interlock Actuator

SW601

Pickup

Controller

Board

Paper

Pickup Block

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.

Basics Sensing System Theory - 27

Cassette
(None)
Legal
Letter
A4
Executive
B5

SW603 SW604 SW605

OFF OFF OFF

ON ON

ON ON
OFF
OFF
OFF OFF

OFF
OFF

ON ON
ON

OFF

ON

Paper

Pickup Block

Pickup

Controller

Board

SW603
SW604
SW605

SW603/4/5

Cassette Size Sensing
Switches (Upper)

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 - 28

SW851/2/3

Cassette Size Sensing
Switches (Lower)

Actuator: Plastic tabs on the
side of a cassette tray
actuate leaf springs, which

Sheet Feeder

Controller Board

SW851
SW852
SW853

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 - 29

When you are troubleshooting, be aware that human error
can be a factor in paper-size sensing for these universal
cassettes.

Basics Hard Drives - 30

Hard Drives

Note:

Refer to the user's guide for initialization

requirements for previously used hard drives.

External Hard Drives

You can connect up to seven external hard drives to the
LaserWriter Pro 630. You cannot connect a SCSI device to
the LaserWriter Pro 600. The SCSI ID assigned to the
LaserWriter Pro 630 is 6. Any SCSI device connected to the
printer must have a different number.

Caution:

communication parameters. It is not a SCSI ID switch.

The push button switch is for configuring

Basics Hard Drives - 31

Internal Hard Drives

Internal hard drives are currently available only through
third-parties. They should come with mounting bracket,
data cable, and documentation.

The data cable for an internal hard drive connects into J1 on
the LaserWriter Pro 630 I/O board. Connector J1 is a 40
pin connector with non-standard 2 mm pin spacing.

Basics Test/Configuration Pages - 32

Test/Configuration Pages

There are three special pages that an operational
LaserWriter Pro 600/630 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 “LaserWriter Utility” 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 LaserWriter
Utility.

Basics Test/Configuration Pages - 34

Ê

Startup Test Page

Printer Name

I/O Board

Type

Communication parameters and printer control
language selected for an individual printer port

ROM
version

Installed RAM

Number of pages
the I/O board has
produced

Other startup icons

FinePrint enabled

PhotoGrade enabled

Hard Drive on-line

600 dpi enabled

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

• Timeout settings (7)

• System administrator password (8)

• SCSI ID (LaserWriter Pro 630 only) (9)

• Halftone screen settings (10)

• Default margin offsets (11)

If possible, always print a configuration page before calling
Apple Technical Assistance Center.

Basics Configuration Switch - 39

Configuration Switch

Configuration

Switch

The communication switch
on the I/O board determines
the communication
configuration for all the
available ports.

Communication
Ports

Basics LaserWriter Safety - 40

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 - 41

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 Pro 600/630

Specifications Engine - 1

Engine

Engine

Printing Method

Optical System

Resolution

Canon LBP-B270 engine

Electrophotography using single-component microfine toner

Semiconductor laser and a rotating six-faced prism scanning

mirror

LaserWriter Pro 600: 600 dpi*
LaserWriter Pro 630: 600 dpi (300 dpi when PhotoGrade is

enabled)

Note:

The LaserWriter Pro 600 requires 8 MB of RAM in

order to print in PhotoGrade or to print at 600 dpi.

Specifications Engine - 2

Dimensions

Clearance Required

Weight

Operating Environment

Power Consumption

Height: 11.61 in. (295 mm)
Width: 16.69 in. (424 mm)
Depth: 16.37 in. (416 mm)

50.4" x 24.25" x 19.75" high (1282 x 616 x 501 mm)

Printer with cassette: 40.7 lb. (18.5 kg):
Toner cartridge: 3.3 lb. (1.5 kg)

Temperature: 50-90.5° F (10-32.5° C)
Humidity: 20-80% relative humidity
Atmospheric Pressure: 570-760 mmHg

Approximately 0.66 kW at 71° F (20° C)

Specifications Engine - 3

Printing Speed

Duty Cycle

Consumables Service Life

8 pages per minute (letter or A4)
6 envelopes per minute (optional envelope feeder)

No limit in pages per month

Pickup Rollers: 200,000 pages
Separation Pad: 200,000 pages
Fuser Assembly: 200,000 pages
Transfer Roller: 200,000 pages
Exhaust Fan: 25,000 hours

Note:

Replace the multipurpose pickup roller and separation
pad together. The separation pad is contained in the
multipurpose tray guide assembly.

Specifications Engine - 4

Macintosh Requirement

Printable Area (in inches)

System Software 6.0.5 or later

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 - 5

I/O Board

CPU

RAM

ROM

Expansion

Motorola 68030 (25 MHz)

LaserWriter Pro 600: 8 MB, expandable to 32 MB *
LaserWriter Pro 630: 8 MB, expandable to 32 MB

Note:

In early 1993 some LaserWriter Pro 600's shipped
with 4 MB of RAM and a free upgrade kit that dealers were
instructed to install. No LaserWriter Pro in the marketplace
was to have been sold with less than 8 MB of RAM.

2 MB standard

40-pin processor direct slot (PDS) provided

Specifications I/O Board - 6

Pinouts

Settings

Imaging Languages Supported

LaserWriter Pro 600:
LocalTalk, RS-232, Centronics
LaserWriter Pro 630:
LocalTalk, RS-232, Centronics, SCSI, Ethernet

Use configuration switch or LaserWriter Utility to set

communication protocols. The setting of the configuration
switch affects the configuration of all the pinouts. See the
user's guide for switch settings.

QuickDraw, PostScript Level 2, and HP PCL 4

Specifications Sheet Feeder - 7

Sheet Feeder

Dimensions
Height: 5.19 in. (132 mm)
Width: 16.38 in. (416 mm)
Depth: 18.50 in. (470 mm)
Weight

12.98 lb. (5.9 kg) with cassette
Power Consumption
24 VDC
supplied by printer
PAGEBREAK

Specifications Envelope Feeder - 8

Envelope Feeder

Dimensions

Weight

Power Consumption

Height: 5.03 in. (127.8 mm)
Width: 12.04 in. (306.5 mm)
Depth: 11.53 in. (293 mm)

5.72 lb. (2.6 kg)

24 VDC supplied by printer

Specifications Paper - 9

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. (16-

32 lb.), envelopes, and fuser-compatible labels and film

Specifications Paper - 10

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 Pro 600/630

Troubleshooting General - 1

General

Troubleshooting contains quick-reference troubleshooting
information for the LaserWriter 600/630. 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 Printer Diagnostic - 2

Printer Diagnostic

To enable the printer diagnostic, switch off the printer, jumper
pins 7 and 9 on the I/O board DB-9 connector, and switch on the
printer. Under normal conditions, LEDs should flash during
startup for about 15 seconds and then fix on the "diagnostic
executing" configuration for about 2 minutes.

9

Jumper

7

Diagnostic Executing

No Error Found

Troubleshooting Printer Diagnostic - 3

If no error is found, all LEDs come on and two pages print. See
next page for "error-found" configurations.

Note:

If the "diagnostic executing" LEDs persist longer than 3

minutes, an unknown error exists.

An "error-found" configuration could indicate a fault anywhere
from the DC controller outward to the module or component. Go to
the topic in Flowcharts that corresponds to the error.

Troubleshooting Printer Diagnostic - 4

Ê

I/O Board Error

Fuser Assembly Error

Laser/Scanner Erro

Main Motor Erro

Fan Error

ROM #1 Error

ROM #2 Error

ROM #3 Error

ROM #4 Error

SIMM #1 Error

SIMM #2 Error

Troubleshooting Maintaining I/O Connectivity - 5

Maintaining I/O Connectivity

Remove the printer interface cable and temporarily install a
Quadra 900/950 floppy drive 20-pin cable between connectors A
and B in the diagram on the next page. This cable has the extra
length needed for the I/O shield to rest flat on the work surface.

Note:

Do not disconnect power supply cable J15, the I/O-CPU

cabling, or the AC power cable.

Troubleshooting Maintaining I/O Connectivity - 6

Ê

Maintaining
I/O Connectivity

A

J15

B

Troubleshooting Troubleshooting Tips - 7

Troubleshooting Tips

Multimeter Probes

The connectors within the LaserWriter 600/630 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 - 8

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 - 9

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 - 10

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 - 11

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:

the metal chassis when performing this procedure.

Do not let the pickup controller board brush up against

Troubleshooting Troubleshooting Tips - 12

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 - 13

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 - 14

Caution:

removing the brush, make sure that the delivery sensing arm
moves freely and is not snagged.

Do not insert the brush too far into the sensor. After

Troubleshooting Troubleshooting Tips - 15

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 - 16

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 - 17

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 - 18

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 C202 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.

DC Controller Board

C202

Troubleshooting Capacitor Discharge - 19

Caution:

before performing this procedure.

To discharge capacitor C202, switch off the printer and remove
the rear panel and I/O shield. Carefully jumper the two wires at
the base of the capacitor using some kind of conductor.

Note:

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.

Be sure to switch off power and unplug the printer

There are many different tools that can be used to discharge

Troubleshooting Capacitor Discharge - 20

Discharging
Capacitor C202

C202

Troubleshooting Fuser Roller Modes - 21

Fuser Roller Modes

Two small levers at each end of the fuser set the fuser rollers into
either print mode or jam-release mode. Apple ships the printer
with the rollers in jam-release mode. Failure to set these levers
into print mode will cause loose toner or smudging problems.

Print Mode:
Engage the fuser rollers by setting the two levers in a "DOWN"
position.

Jam-Release Mode:
Disengage the rollers by setting the two levers in an "UP"
position.

Troubleshooting Fuser Roller Modes - 22

Fuser Assembly

Left

Lever

Right

Lever

Troubleshooting Expansion Post Connectors - 23

Expansion Post Connectors

The LaserWriter 600/630 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:

upside-down, they will not couple properly.

The cable receptacles are keyed. If you install them

Troubleshooting Expansion Post Connectors - 24

Fin

Cross Section

Fin

Expansion Post Connector

Troubleshooting Circuit Board Diagrams - 25

Circuit Board Diagrams

On the following pages are diagrams of the circuit boards and
high-voltage contacts listed below:

• LaserWriter Pro 600 I/O Board

• LaserWriter Pro 630 I/O Board

• 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 - 26

Configuration Switch

LocalTalk

RS-232 (Serial)

Centronics (Parallel)

LW Pro 600 I/O Board

J1 J2

SIMMs

J10

J11

ROMs

J13

PDS

J15

ROM SIMM Slot

Troubleshooting Circuit Board Diagrams - 27

Configuration Switch

SCSI

LocalTalk

RS-232 (Serial)

Ethernet

Centronics (Parallel)

LW Pro 630 I/O Board

J1 J2

SIMMs

J10

J11

PDS

1234

ROMs

J13

J15

ROM SIMM Slot

Troubleshooting Circuit Board Diagrams - 28

J202

J201

J213

J203

J204 J205

C201 C202

TB201

DC Controller Board

VR202 (see "Registration Adjustment"
in Adjustments.)

J206

J207

J208

J213

J209

J210J211

Troubleshooting Circuit Board Diagrams - 29

Service Test
Page Button

Cover Interlock

J604

J605

Cassette Size

Microswitches

SW601

Switch

SW602

SW603
SW604
SW605

J601

J603

J602

Pickup Controller Board

J604

J605

Troubleshooting Circuit Board Diagrams - 30

J704
J703
J702

PS702

Multipurpose Tray

Paper-Present

Sensor

Multipurpose Tray

Paper-End

PS701

Sensor

Pickup Sensor Board

Pickup Controller
Board Receptacle

J701

Troubleshooting Circuit Board Diagrams - 31

J402

VR401

TB406

TB405

TB403TB404

High-Voltage Power Supply

PS Interface Board

Receptacle

J401

TB402 TB401

Troubleshooting Circuit Board Diagrams - 32

Envelope Feeder
Controller Board

J931

PS931

J932

Troubleshooting Circuit Board Diagrams - 33

Sheet Feeder
Controller Board

J853 J851

PS851 J852

SW851
SW852
SW853

Tab Cutout

Cassette Size
Microswitches

Troubleshooting Wiring Diagram - 34

Wiring Diagram

The LaserWriter 600/630 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).

FUSER ASSEMBLY

TP1

H1

F

TONER

CARTRIDGE

PRI

GND

TR

DEV

ANTIN

GND

TRANSFER

34
12

Pickup Roller

Clutch Solenoid

UP

BLOCK

67

3

2

J136

SL851

M3

TH1

J743

A

LOW

TB406
TB402
TB401
TB405
TB403
TB404

B

A
/A
B

/B

J744

B

D742
D741

J401

J402

123

ANT

REF

GND

8
1

SW852

SW853

SW851

Cassette Size

Sensing Switches

J853

1
2
3

1
2
3
4

J852

8

8

7

7

6

6

5

5

4

4

3

3

2

2

1

1

J743
J742

B5

B5

A5

A5

B4

B4

A4

A4

B3

B3

A3

A3

B2

B2

A2

A2

B1

B1

A1

A1

HV

POWER

SUPPLY

PICKUP CONTROLLER BOARD

HIGH-VOLTAGE

CONNECTOR BOARD

13

J601

1
4

J603

1

J602

B
A

5

1

(Solder Side)

J604

J605

C

1
2
3
4

J851

PS851

Sheet Feeder

Paper-Present

Sensor

F

F

FEEDER

(Optional)

1
4

1

6

J135

SHEET

J741

10

+24VA
2NDO

2NDI
GND

ENVELOPE

FEEDER

(Optional)

9
8
7
6
5
4
3
2
1

+24VB

/TXD

+5V

/RXD

GND

SL02

GND

GNDTH

FSRTH
+24VB
+5V

TVIN

HVRST
/TVOUT
SLI2

J210

5
4

J203

3
2
1

PICKUP CONTROLLER BOARD

C

1
2
3
4

J136

A

J931

Envelope Feeder

Paper-Present Sensor

M1

J603

J604

1234

+24VA

1234

PS931

J211

GND

+24VD

1234

J131

MAIN MOTOR

GND

EBVI

EBVO

F
F

J932

1234

/MON

1
2
3
4

/MRDY

Main
Power
Switch

SW101

12

J102

POWER SUPPLY

J104

123

123456

RLD

GND

SLO1

THOUT

123456

PAP

SLI1

J601

+5V

PBP

/FSRD

123

12345678910

J212

12345678910111213

1 2 3 4 5 6 7 8 9 10 11 12 13

A
/A

M4

B

/B

LINE

INPUT

1

J101

2
3

J105

4

J103

+5V

GND

GND

GND

+24VA

TB201

J201

+5V

GND

GND

+24VA

+24VB

+24VB

DOPEN

'H' When Door

Is Open

J605

123456

GND

1STL

1STS

RESL

'L' When
Tripped

123 123

PS601 PS602

CASSETTE

PAPER SENSOR

1
2
3
4

DC CONTROLLER BOARD

+24VA

SW601

SENSOR HOLDER

GND

RESS

REGISTRATION

PAPER SENSOR

LASERWRITER PRO I/O BOARD

J15

1234567891011121314151617181920

/BD

GND

/RDY

/PPRDY

/VSREQ

1234567891011121314151617181920

GND

APCIN

APCOUT

1234567 123456 1234

LASER DRIVER

'L' When Tripped

ASSEMBLY

J2

/STS

/PCLK

/SBSY

/LON

/ENBL

/VDATA

LASER/SCANNER ASSEMBLY

GND

/PRNT

/CBSY

/VSYNC

/CPRDY

J207

+5V

/SCNRDY

/SCNON

SCANNER

MOTOR UNIT

'H' When Tripped
'L' When Tripped

A1 B1A2B2A3 B3A4B4 A5 B5

A1 B1A2B2A3 B3A4B4 A5 B5

PA

/PAMP/PB

PS701

Multipurpose

Paper-End

Sensor

PICKUP SENSOR BOARD

/CMD

+24VA

J602

PDS

1

J13

40

EXHAUST

FM1

FAN

GND

GND

GND

GND

/VDO

/CCLK

J205J206

GND

SCNCLK

M5

PB

1ST

MPS

PS702

Multipurpose

Paper-Present

Sensor

'H' When

123456781234567

+5V

J731J151J721

BEAM DETECT

IC UNIT

Service Test
Page Switch

J701

MPE

GND

+24VA

123

Tripped

/BDI

GND

SW602

J702

J703

J704

FAND

J209

J204

J208

1
2
3

1
2
3
4

1
2

GND

FLOCK

1
2
3
4
5
6

1
2
3

Sensing Switches

+24VA

MPD

GND

PA

/PA

PB

/PB

+24VA

1STD

Cassette Pickup Roller

LED

STATUS

PANEL

PSNS

123

PS201

DELIVERY/

INTERLOCK

SENSOR

SW603/4/5

Cassette Size

Multipurpose

Pickup Roller

Clutch Solenoid

Clutch Solenoid

SL702

SL701

LaserWriter Pro 600/630

Wiring Diagram

6
5
4
3
2
1

GND

M2

PSL

Troubleshooting Connector J136 Locator - 36

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.

34

12

Troubleshooting Connector J743 Locator - 37

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.

67

8

1

Connector J743

Fuser Assembly

Flowcharts and TablesTroubleshooting

LaserWriter Pro 600/630 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?

Yes

No

Go to Table 1.

Does

the ready LED

glow steadily after the

printer warms

up?

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?

Yes

If necessary, restore the

customer's LaserWriter

Utility settings. (For

example: Startup Page,

Automatic Tray Switching,

and Default Resolution.)

No

No

A

Go to Figure 2,

Print Quality

Problems.

PRINTER IS FUNCTIONAL

Troubleshooting

222

2

Flowcharts and Tables

2

A

Are all

LEDs off?

No

Are

the toner-out

and paper-jam LEDs

flashing?

No

Is the toner

LED on or

flashing?

No

Is the paper-out

LED on?

Yes

Yes

Yes

Yes

Go to Table 2.

Perform the EPOST

procedure (see the

"Printer Diagnostic"

topic).

Go to Table 3.

Go to Table 4.

2

2

No

Is the paper-jam

LED on?

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.

Yes

Go to Table 5.

T roubleshooting T ables

Flowcharts and TablesTroubleshooting

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 Check Result Action

1 Does the power supply

fan come on when you
turn on the printer?

2 Do any of the motors

rotate after the printer
starts up?

No

Yes

Yes

Remove the rear panel, I/O board,
and I/O shield, and restart the printer.

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.

Check the connections at J213 and
J214 on the DC controller board, and
check that nothing physical is b locking
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

222

2

Flowcharts and Tables

Table 2. All LEDs Are Off After Printer Warmup

Step Check Result Action

1 Are the top cover and

fuser door closed?

2 Remove the rear panel

and I/O shield. Is the sta­tus panel cable securely
connected to J204 on the
DC controller board?

3 Can you print despite the

fact no LEDs illuminate?

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 Close them completely, and confirm

that the plastic tab actuators on the
doors are intact. No LEDs illuminate if
either door is open.

No Secure the cable.

Yes Check connection between the status

panel and the DC controller board. If
the connections are secure, replace
the status panel.

No Replace the delivery/interlock

assembly.

2

2

2

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?

6 Press the top cover inter-

lock leaf spring. Do you
hear the clicking sound of
a microswitch when you
press the spring?

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?

No Replace the DC controller board.

No Confirm that the black plastic actuator

is in place behind the top of the pickup
controller board.

Yes

No

Replace the pickup controller board.

Replace the DC controller-board-to­pickup-controller-board cable.

Table 3. Toner LED Is On or Flashes After Printer Warmup

Step Check Result Action

Flowcharts and TablesTroubleshooting

1 Try a known-good toner

cartridge. Does the
problem persist?

2 Have you recently ser-

viced the printer and has
this symptom existed
ever since?

3 Have you just performed

the engine diagnostic?

4 Remove the toner car-

tridge and inspect all the
toner contacts for damage
or excess toner buildup.
Are the contacts clean
and in good condition?

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 Problem solved.

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.

Yes Confirm there is not still a serial loop-

back connector installed in the serial
port.

No Clean or repair the contacts if possi-

ble. 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.

No

Yes

Replace the DC Controller board.

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-to­ HVPS interface board.

• Replace the transfer block assembly.

• Replace the DC controller-board-to­ HVPS cable.

Troubleshooting

222

2

Flowcharts and Tables

Table 4. Paper-Out LED is On After Printer Warmup

Step Check Result Action

1 Is the cassette empty or not

installed?

2 Remove the cassette and

inspect the paper-sensing
lever. Is the lever broken?

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?

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 v oltage
measure 5 V?

Yes Make sure that the cassette is present

and has paper.

Yes Replace the sensor holder

assembly.

Yes Replace the pickup controller board.

No Replace the DC controller board.

2

2

2

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?

6 Measure the voltage

between J605-5 (GND) and
J605-3 (1STS). Does the
voltage measure 5 V?

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 DC-controller-to-pickup-

controller cable.

No Replace the pickup controller board.

No

Yes

Replace the sensor holder assembly.

Replace the pickup controller board.

Flowcharts and TablesTroubleshooting

Table 5. Paper-Jam LED is On After Printer Warmup

Step Check Result Action

1 Is the delivery/interlock

sensor snagged?

2 Is the delivery-sensing lever

snagged?

3 Is the registration-sensing

lever snagged?

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?

Yes

Yes

Yes

No

Remove the top cov er 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.

Remove the top cov er 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.

If the lever is brok en or snagged, remov e
the pickup block and troubleshoot
further. If necessary, replace the sensor
holder assembly.

Secure the cable.

5 Place probes between J208-

2 (GND) and J208-3 (PSNS).
Does the voltage rise to 5 V
as you open the fuser door?

6 Place probes between

J201-7 (+5 V) and J201-1
(GRD) on the DC controller
board. Does the voltage
measure 5 V?

No

No

Replace the delivery/interlock assembly.

Replace the DC controller board.

Troubleshooting

222

2

Flowcharts and Tables

Table 5. Paper-Jam LED is On After Printer Warmup (Continued)

Step Check Result Action

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?

8 Place probes between

J605-6 (RESS) and J605-5
(GND). Does the voltage
measure 5 V?

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 DC-controller board-to-

pickup-controller-board cable.

No Replace the pickup controller board.

No

Yes

Replace the sensor holder assembly.

Replace the DC controller board.

2

2

2

Important

When there is a failure of the fusing system, the DC controller board shuts off
current to the fuser roller heater and charges capacitor C202 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?

2 Is the power supply firmly

seated?

No Secure the connector.

No Seat the power supply.