Apple Laserwriter Pro 810 Service Manual
LaserWriter Pro 810
Service Technical Documentation
Table of Contents
Section 1. Introduction
Section 2. Setup Menu
Section 3. Preventive Maintenance
Section 4. Take Apart
Section 5. Troubleshooting
Section 6. Interface Configurations
Appendix A. Memory Expansion Upgrade
Appendix B. Illustrated Parts List
All rights reserved. No part of this document may be reproduced without the
express permission of Apple Computer, Inc.
The material in this document is for informational purposes and is subject to
change without notice Apple Computer, Inc. assumes no responsibility for errors
or omissions in this document. Nor is any liability assumed for any damages
resulting from the use of the information it contains.
TRADEMARK ACKNOWLEDGEMENTS
HP Laserjet Series IIP is a trademark of Hewlett Packard, Inc.
PostScript is a registered trademark of Adobe System Incorporated.
Apple and LaserWriter are a registered trademarks of Apple Computer, Inc.
Macintosh is a trademark licensed to Apple Computer, Inc.
First Edition June 1993
WARNING
FCC Regulations state that any unauthorized changes or modifications to the
equipment not expressly approved by the manufacturer could void the user's
authority to operate this equipment.
NOTE
This equipment has been tested and found to comply with the limits for a Class A
digital device pursuant to Part 15 of FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may
cause interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
NOTE
In order to maintain compliance with FCC regulations, shielded data cables must
be used with this equipment.
BESCHEINIGUNG DES HERSTELLERS/IMPORTEURS
Hiermit wird bescheinigt, daß der Laser Drucker Typ LaserWriter Pro 810 in
Übereinstimmung mit den Bestimmungen der Vfg. 1046/1984 funk-entstört ist.
Der Deutchen Bundespost wurde das Inverkehrbringen dieses Gerätes angezeigt
und die Berechtigung zur Überprüfung der Serie auf Einhaltung der Bestimmungen
eingeräumt
Apple Computer, Inc.
.
CERTIFICATE OF MANUFACTURER/IMPORTER
This is to certify that the Laser Printer Model LaserWriter Pro 810 is shielded
against radio interference with the provisions of Vfg. 1046/1984.
The German Postal services have been advised that this device is being put on the
market and are entitled to inspect the series for compliance with the regulations.
Apple Computer, Inc.
USER SAFETY
The Printer is certified as a Class 1 laser product under the U. S. Department of
Health and Human Services (DHHS) Radiation Performance Standard according to
the Radiation Control for Health and Safety Act of 1968. The product is safe to
use during normal operation and maintenance.
Protective housing and external covers completely confine the laser light emitted
inside the printer. The laser beam cannot escape from the machine during any
phase of normal user operation.
CAUTION
Performance of procedures other than those specified in this manual could result
in hazardous radiation exposure.
Regulations implemented on August 2, 1976, by the Center for Devices and
Radiological Health (CDRH) of the U. S. Food and Drug Administration (FDA) apply
to laser products manufactured from August 1, 1976. Laser products sold in the
United States must comply with these regulations.
This digital apparatus does not exceed the Class A limits for radio noise
emissions from digital apparatus set out in the Radio Interference Regulations of
the Canadian Department of Communications.
Le present appareil numerique n'emet pas de bruits redioelectriques depassant les
limites applicables aux appareils numeriques de la class A prescrites dans le
Reglement sur le brouillage radioelectrique edicte par le ministetre des
Communications du Canada.
LITHIUM BATTERY INFORMATION
CAUTION
Danger of explosion if battery is incorrectly replaced. Replace only with the same
or equivalent type recommended by the manufacturer. Dispose of used batteries
according to the manufacturer's instructions.
A "dead" lithium battery is considered hazardous waste and has some potential
for explosion if improperly handled. Mark the battery "Dead". Place it in a ziplock wrapper and the packaging used to ship the replacement battery, and return
the dead battery to Apple, where it will be disposed of following EPA guidelines.
Exception: If the battery is physically damaged, do not return it to Apple. Dispose
of the battery locally according to local ordinances.
(Instructions for replacing the battery are given in this manual.)
CAUTION
Invisible laser radiation when open and interlocks defeated. Avoid exposure to
laser beam.
LaserWriter Pro 810
Section 1: Introduction
LaserWriter Pro 810 Nov 93 Introduction/1-2
GENERAL
The printer consists of two major blocks—the controller and the print
engine. The controller functions as the interpreter of the source print data
and creates dot pattern information. The print engine prints the data based
upon the dot pattern information it receives from the controller.
The print engine includes the Laser Scanner Unit (laser/optical unit), EP
cartridge (developer, drum, toner, main charger), and paper feed
mechanisms. The print engine mechanisms are controlled by the DC
Controller.
This section of the manual describes the overall print process, Laser
Scanner Unit functions, and DC Controller functions. Locations of other
major parts and assemblies are provided as well as a brief description of
their functions.
NOTE: Many of the drawings in this manual show a two-tray model of the
LaserWriter Pro laser printer. All pictures of the two-tray model used in
this manual accurately represent the three-tray LaserWriter 810.
Apple Computer does not include a two-tray printer in the LaserWriter
810 product offering. If this manual is revised in the future the graphics
will be changed to reflect the three-tray configuration.
LaserWriter Pro 810 Nov 93 Introduction/1-3
PRINTING PROCESS
MAIN
CHARGER
EP CARTRIDGE
MAGNETIC
ROLLER
TRANSPORT
CHUTE
PAPER PATH
ERASE LAMP
HEAT ROLLER
LASER SCANNER
UNIT
DRUM
PRESSURE
ROLLER
DRUM CLEANING
BLADE
DETACK
SAW
TRANSFER
CHARGER
FIRST TRAY
SECOND TRAY
THIRD TRAY
CONTROLLER
WAFER BOX
FEED
ROLLERS
Charging The main charger places a negative charge on the drum.
Exposure When an image signal is received, the laser emits light to the drum and
erases the negative charges to form an electrostatic latent image.
Developing The magnetic roller is covered by a thin film of magnetic toner. The toner
(negatively charged) is attracted to the latent image on the drum and forms
a visible image on the drum.
Transfer The transfer charger applies a positive charge to the bottom surface of
paper that transfers the toner image from the drum to the paper.
Separation The paper is separated from the drum by a combination of the detack saw
bias voltage and the paper's characteristics.
Fusing The toner image is fused to the paper by the heat and pressure applied by
the fuser rollers.
Cleaning The cleaning blade scrapes off any residual toner on the drum. At the same
time, the erase lamp transmits light to the drum and erases any residual
electrical charge. Following the cleaning process the print process starts
again from the charging cycle.
LaserWriter Pro 810 Nov 93 Introduction/1-4
PART NAMES AND PART FUNCTIONS
LASER SCANNER
UNIT
HIGH VOLTAGE
DC CONTROLLER
MAIN MOTOR
POWER SUPPLY
LOW VOLTAGE
POWER SUPPLY
FUSER
FAN
ASSEMBLY
TABLE 1-1. PART NAMES AND FUNCTIONS
Name Main function
Main Motor Supplies the main mechanical drive for the printer. A fan on the
motor shaft cools the drive unit.
Laser Scanner Unit Receives a signal from the user system through the DC Controller
board, and converts the signal into a laser beam that is transmitted to
the drum to form an electrostatic latent image.
Low Voltage Power
Supply (LVPS)
Generates the +5, +15, and +24 voltages for the various printer
assemblies from the AC voltage input. Includes the main power
switch.
High Voltage Power
Supply (HVPS)
Generates the high DC/AC voltage for the transfer charger, main
charger, and magnetic roller.
DC Controller Controls the whole operation of the printer based on data from each
sensor and commands from the user system.
Fuser Fan Assembly Serves as the exhaust fan to prevent temperature in the printer from
rising.
LaserWriter Pro 810 Nov 93 Introduction/1-5
PRE-REGISTRATION
SENSOR
TONER OUT
SENSOR
EP CARTRIDGE
SENSOR
INTERLOCK
SWITCH
RANSPORT ROLLER
CLUTCH
REGISTRATION
CLUTCH
PAPER FEED
SOLENOID
EXIT
SENSOR
TABLE 1-1. PART NAMES AND FUNCTIONS (CONTINUED)
ERASE LAMP
PAPER
OUT
SENSOR
FUSER THERMOSTAT
TEMPERATURE
SENSOR
CONTROL PANEL
ASSEMBLY
PAPER SIZE
SENSOR
POWER
SWITCH
Name Main function
Control Panel Assembly Displays the printer's operating status, error messages, and corrective
actions. The keypad is used for setting printer operating parameters.
Erase Lamp Light Emitting Diodes (LED) used to erase any residual charge on the drum.
Power Switch Turns AC power supply ON and OFF. The switch is part of the LVPS.
Cartridge Sensor Determines that the EP cartridge is seated correctly.
Temperature Sensor Detects the surface temperature of the heat roller and transmits a signal to
the DC Controller board to keep the heat roller temperature constant.
Fuser Thermostat Shuts off AC voltage to the fuser bulb when heater roller temperature gets
too high because of trouble with the temperature sensor, DC Controller, etc.
Paper Size Sensor Detects the size of a cassette installed in the printer by a combination of
“ON" and “OFF" signals transmitted by four independent sensors.
Paper Out Sensor Detects the absence of paper in the paper cassette.
Interlock Switch When the top cover is opened, the AC power for the fuser bulb, 24 VDC, and
15 VDC is interrupted and the printer stops immediately.
Exit Sensor Detects a paper jam at the paper exit.
Toner Empty Sensor Detects a no toner condition in the EP cartridge.
Pre-Registration Sensor Detects paper movement as well as no paper conditions when using the
manual feed guide.
Registration Clutch Rotates and stops the registration roller to position paper for a toner image
transfer from the drum.
Paper Feed Solenoid Electrically controls the rotation/stop operation of the feed roller that
moves the paper from a cassette.
Transport Roller Clutch Controls rotation/stop operation of the transport roller that moves the
paper from the cassette to the upper transport roller or registration roller.
LaserWriter Pro 810 Nov 93 Introduction/1-6
EXPOSURE PROCESS
MIRROR 2
POLYGON
MIRROR
LENS 2
MIRROR 1
WINDOW
SOS
SENSOR
LENS 1
LASER DIODE
AND CYLINDER
LENS
DRUM
Except for the semiconductor, diode-type laser, the printer uses the same
Xerographic process as conventional copiers. When the printer receives a
print start signal from the I/O Controller, the laser diode starts emitting
light.
The laser beam from the laser diode is collimated by a cylinder lens before
being transmitted to the polygon mirror. The six-sided polygon mirror is
driven by the scanner motor that rotates at a constant speed (RPM). Each
rotation of the polygon mirror causes one scan line.
The laser beam, reflected by the polygon mirror, is transmitted to the
drum through lenses 1 and 2, mirrors 1 and 2, and the window. On the
right side of mirror 2 is a mirror for the Start of Scan (SOS) sensor. This
configuration keeps a constant scanning position for each scan line.
LaserWriter Pro 810 Nov 93 Introduction/1-7
DC CONTROLLER FUNCTIONS
The DC Controller has the following main functions.
User System/Printer Communications
Receives video data synchronized with the video clock signal from the I/O
Controller and sends the video data synchronization signal and status signal
to the I/O Controller.
Sensor And Switch Signal Detection
Inputs signals from the sensors and switches that detect the status of the
printer before and during the print sequence.
Laser Scanner Unit Control
Monitors the scanner motor RPM and receives the SOS (Start of Scan)
signal to synchronize the start of laser beam scanning. Sends the video
print data to the Laser Scanner Unit in synchronization with the SOS signal.
Control Panel Display and Input
Displays error and status messages. Receives the input signals from the
keypad.
Print Sequence Control
Using sensor data and timers, it controls the print sequence of paper feed,
movement, and discharge.
Engine Self-Test and Diagnostics
The self-test print and diagnostic functions aid in the detection of print
engine errors and malfunctions.
LASER SCANNER UNIT BOARD FUNCTIONS
The board in the Laser Scanner Unit has the following functions:
Receives video data from the DC Controller board and uses it to control the
laser beam to form a latent image on the drum.
Controls the scanner motor so that it keeps rotating at a constant speed.
LaserWriter Pro 810 Nov 93 Introduction/1-8
PRINTER SPECIFICATIONS
TABLE 1-2. PRINTER SPECIFICATIONS
ITEM DESCRIPTION
Type Desk top type
Page description
language/Emulation
Printing system Laser xerography system; Write black.
Print speed, maximum 20 sheets per minute
Resolution 300,400,600, and 800 dots/inch.
Paper feed Cassette paper feed
Paper cassettes,
standard
Optional cassette sizes Letter (8.4" x 11")
Paper sizes, manual feed Paper size: A4LEF, A4SEF, Executive, Legal, Letter LEF,
Paper weight Cassette feed: 52-82 g/m
Paper capacity Cassette: 250 sheets (64 g/m
Exit tray capacity Face up: 250 sheets (64 g/m
Printer size in millimeters Width Depth Height
Printer size in inches Width Depth Height
Printer weight 24.6 Kg, 54.23 lbs.
Warm-up time
Time to first print approximately 20 seconds
Noise level During operation: 53 dBA or less
Power supply 115 +10 VAC, 50/60 +2 Hz or
Power consumption Maximum 0.8 kW or less
Working Temperature
Humidity 15% to 85% RH non-condensing
Postscript Level 2 and HP LaserJet IIP
Manual paper feed
Multi media power feeder (Option)
Standard in 115 volt printers:
Letter (8.5" x 11")
Ledger (11" x 17")
Standard in 220/240 volt printers:
A3 (297 mm x 420 mm)
A4 (210 mm x 297 mm)
US Ledger (11" x 17")
Universal - all standard sizes
Letter SEF, Folio, B4, B5 and Invoice.
Envelope Size: Com-10, Monarch, C5, and DL
2
paper
Manual feed: 52-139 g/m2 paper or postcard stock 190
2
g/m
2
paper)
Multi media power feeder:
100 sheets (64 g/m
2
paper)
15 envelopes
2
letter -size paper
Face down: 250 sheets (64 g/m2 letter-size paper)
519 410 487
20.4 16.14 19.17
approximately 1 minute, at room temperature (22oC to 35oC
or 72oF to 95oF).
During standby: 40 dBA or less
220/240 VAC, 50/60
+2 Hz (International market)
10o to 35oC (50o to 95o F)
LaserWriter Pro 810 Nov 93 Introduction/1-9
STORING CONSUMABLES
Paper should be stored in a cool, dry place. Keep it out of direct sunlight.
Avoid storing paper in an area with high humidity. When the printer isn't
going to be used for a long time, remove all the paper from the cassettes and
wrap it in the original wrapper.
EP Cartridges should be stored in a cool, dry place. Do not store them in
direct light. Avoid storing the EP cartridges in areas with high
temperature and humidity (0-35o C, 32-95o F and 10-80% relative
humidity). Do not store the cartridges on their sides or on end.
Be especially careful of conditions that could cause condensation to form on
the drum.
LaserWriter Pro 810
Section 2: Setup Menu
LaserWriter Pro 810 Nov 93 Setup Menu/2-2
GENERAL
Setup Menu Keys
MENU KEY
ENTER KEY
ARROW KEYS
ONLINE KEY
FORM FEED
This section tells you how to use the Setup Menu to change the printer's
operating parameters. Operating parameters, such as input port, printer
type, and paper source are set through the Setup Menu.
The control panel keys that are used to get around in the setup menu are
illustrated and described below. See the User's Manual for more detailed
instructions for using the Setup Menu.
MENU
ONLINE
RESET
FORM
FEED
PRINT
STATUS
MENU
ENTER
Press to enter the Setup Menu after the printer is off-line. Press ENTER to
select a value.
ENTER
Press to select a menu item or a displayed value. Press to permanently save
any changes made to the setup menu. The changes are retained even if the
printer is turned off.
Press to scroll through a menu or sub-menu level.
ONLINE
Press to exit the setup menu. Press in response to a SAVE SETTING?
message to temporarily save any changes made to the menu settings. These
changes are lost when the printer is turned off.
FORM
FEED
The form feed key is not operational
LaserWriter Pro 810 Nov 93 Setup Menu/2-3
Setup Menu Messages
TABLE 2-1. MENU MESSAGES
Setup Menu Description
The messages that you may encounter while using the setup menu are listed
and described in Table 2-1. Instructions for using the setup menu are in
the User's Manual.
Menu Message Description
SAVE SETTINGS?
ENTER=PERMANENT
ONLINE=TEMPORARY
TEMPORARY After setup menu changes have been
PERMANENT After setup menu changes have been
FACTORY SETUP?
ENTER=RESTORE
ONLINE=CANCEL
After changes have been made to the setup
menu, the ENTER and ONLINE prompts are
displayed alternately until the ONLINE or
ENTER key is pressed.
temporarily saved by pressing the ONLINE key,
this message is displayed.
permanently saved by pressing the ENTER key,
this message is displayed.
When RESTORE FACTORY SETUP is selected
from the Misc. menu, the ENTER and ONLINE
prompts are displayed alternately until the
ONLINE or ENTER key is pressed.
The Setup Menu for the printer works like many menu-driven software
packages. When you select an item in one menu, another menu may be
called up. You can continue to choose from each new menu until you get to
the selection you need.
The Setup Menu is illustrated in the diagram on the following pages. In the
diagram, the first item listed in a sub-menu is the factory default. After
changes have been made, the newly selected items or values are listed first
in the sub-menus. Each time you enter the Setup Menu, you are returned to
the menu or sub-menu that was displayed when you left it.
NOTE: An asterisk (*) appears in the message window when an item is
selected.
LaserWriter Pro 810 Nov 93 Setup Menu/2-4
SETUP MENU
Level 1 Level 2 Level 3 Level 4 Level 5
MENU:
POSTSCRIPT
RESOLUTION
POSTSCRIPT
RESOLUTION
300, 400, 600,
800
MENU:
INPUT PORT
INPUT PORT
PARALLEL
PARALLEL
ENABLE
ENABLE
YES (N0)
PARALLEL
PRINTER TYPE
PRINTER TYPE
POSTSCRIPT
(LJETIIP)
INPUT PORT
RS232
RS232
ENABLE
ENABLE
YES (NO)
RS232
BAUD
BAUD
9600 (19200,
38400, 300, 600,
1200, 2400,
4800)
RS232
PARITY
PARITY
NONE (EVEN, ODD,
MARK, SPACE)
RS232
FLOW CONTROL
FLOW CONTROL
XON-XOFF (DTR)
RS232
STOP BITS
STOP BITS
1 (2)
RS232
DATA BITS
DATA BITS
8 (7)
Level 1 Level 2 Level 3 Level 4 Level 5
LaserWriter Pro 810 Nov 93 Setup Menu/2-5
SETUP MENU (Continued)
Level 1 Level 2 Level 3 Level 4 Level 5
MENU:
INPUT PORT
INPUT PORT
LOCALTALK
MENU:
MISC
MISC RESTORE
FACTORY SETUP
MISC
EXIT JAM
REPRINT
RS232
PRINTER TYPE
PRINTER TYPE
POSTSCRIPT
(LJET IIP)
LOCALTALK
ENABLE
ENABLE
YES (NO)
PRINTER TYPE
POSTSCRIPT
(LJET IIP)
EXIT JAM
REPRINT DISABLE
(ENABLE)
MISC
START-UP PAGE
START-UP PAGE
ENABLE
(DISABLE)
MISC
SCSI DELAY
SCSI DELAY:
OFF
(20, 40, 60)
Level 1 Level 2 Level 3 Level 4 Level 5
LaserWriter Pro 810 Nov 93 Setup Menu/2-6
SETUP MENU (Continued)
Level 1 Level 2 Level 3 Level 4 Level 5
MENU:
PAPER SOURCE
PAPER SOURCE
TRAY 1 (TRAY 2,
TRAY 3)
PAPER SOURCE
AUTO CASCADE
AUTO CASCADE
TRAY 1 & 2 & 3
(TRAY 1 & 2,
TRAY 1 & 3,
TRAY 2 & 3)
PAPER SOURCE
M-M PWR FEEDER
M-M PWR FEEDER
LETTER(8.5X11)
[LEGAL(8.5X14),
STAT(5.5X8.5),
EXEC(7.25X10.5),
FOLIO(210X330),
A4(210X297),
A5(210X148.5),
B5(182X257),
COM-10 ENV,
MONARCH ENV,
INT'L DL ENV,
INT'L C5 ENV]
PAPER SOURCE
MANUAL FEED
MANUAL FEED
LETTER, LEF
(LEDGER, SEF
LEGAL, SEF
STATEMENT, SEF
EXECUTIVE, SEF
LETTER, SEF
A4, SEF
A4, LEF
A5, SEF
A5, LEF
B5, LEF
B4, SEF
ENV COM-10, SEF
ENV MONARCH SEF
ENV DL SEF
ENV C5, SEF
Level 1 Level 2 Level 3 Level 4 Level 5
LaserWriter Pro 810 Nov 93 Setup Menu/2-7
MENU POSTSCRIPT:/RESOLUTION
MENU:/INPUT PORT
The POSTSCRIPT RESOLUTION menu selects either 300, 400, 600 or 800
Dots-Per-Inch (DPI) resolution whenever POSTSCRIPT is the selected
printer type. Changing the resolution to 400, 600 or 800 (DPI) has no
effect when the printer type is LJET IIP (HP LaserJet IIP).
The printer has three Input/Output (I/O) connectors available. Since a
different system can be connected to each of the I/O connectors, the printer
can be shared by three user systems.
NOTE: PostScript documentation refers to the printer interfaces (I/O) as
channels. Port is another word sometimes used to refer to the interface
connectors and circuitry.
When the printer is shared by two or more systems, the interfacing
circuitry checks or polls each interface for incoming data. When data is
received on a port, that job is processed without interruption. Once the job
is completed, polling for incoming data resumes.
The Input Port Menu lets you disable an interface and/or set up the
required operating parameters that control communication between the
computer system(s) and the printer. The two serial channels can each be
set up with different protocols and baud rates.
The Input Port Menu also lets you select the PRINTER TYPE for each
channel. All three ports can be setup with PostScript as the Printer Type.
However, a combination of PostScript and HP LaserJet Series IIP can be
implemented. The printer type factory default for all three ports is
Postscript.
LaserWriter Pro 810 Nov 93 Setup Menu/2-8
MENU:/MISC
MENU:/PAPER SOURCE
The Miscellaneous Menu is a selection of several miscellaneous features and
functions of the printer. It includes:
• resetting the printer to the factory defaults (RESTORE FACTORY
SETUP)
• enabling the EXIT JAM REPRINT function
• disabling the START-UP PAGE function
• setting a delay time for a hard disk drive
• selecting the language for the control panel messages
RESTORE FACTORY SETUP can be used whenever the printer needs to be
reset to the factory defaults. This is useful if changes have been made that
do not seem to be functioning as planned.
Three factory defaults, one of which is selectable from the Setup Menu,
cannot be changed by the RESTORE FACTORY SETUP. The three are Display
Language, printer name, and page count.
The EXIT JAM REPRINT function enables the printer to reprint a page that
may be in the exit area when a jam occurs. This means that two pages,
instead of one, are reprinted. Because reprinting two pages uses more of
the printer memory, the function can be turned off to free more memory.
The START-UP PAGE function can be turned off after the printer is set up.
However, printing the start-up page is a good way to be sure that the
printer is operating correctly.
The SCSI DELAY function sets the length of time the printer will wait for a
hard disk drive to come ready during the power on cycle. Some disk drives
may take longer than the printer to power up. The delay avoids the
possible problem of the printer not seeing the disk drive.
A DISPLAY LANGUAGE menu is displayed when this feature is supported. It
lets you select the language that is used for the messages that are displayed
on the control panel. English is the default.
The PAPER SOURCE Menu is used to select a paper source. If the printer
model has only one cassette and the multi media power feeder is not
installed, only manual feed and tray one are displayed on the Setup Menu.
Manual feed and the multi-media power feeder both have sub-menus for
selecting the paper and envelope sizes.
The Auto Cascade function can be enabled in this menu. For this feature to
work, each cassette (tray) must contain the same paper size.
LaserWriter Pro 810
Section 3: Preventive Maintenance
LaserWriter Pro 810 Nov 93 Preventive Maintenance/3-2
GENERAL
This section describes a preventive maintenance procedure that should be
carried out whenever other service is required by the user. By checking the
printer on a service call, you can instruct the user about printer care and
possibly prevent future problems. The procedure can be completed in 10
minutes or less.
PREVENTIVE MAINTENANCE PROCEDURE
1 . Record the total number of pages fed through the printer to date.
• Turn the printer on while pressing the DOWN arrow key to enter
the diagnostic mode.
• Press the DOWN arrow key once again to enter the total counter
display. The LED displays a cumulative count in six digits.
• Estimate the life of the consumables from the counter reading.
2 . Check overall printer operation by doing the following:
• Turn off the printer.
• Turn the printer on while pressing the ENTER key to enter the
print test mode.
NOTE: If the multi media power feeder is installed, make several
prints using it as the paper source. See Section 5 for more
information about using the print test mode.
• Make several prints in the test print mode.
• Listen for abnormal noises as the test printout is printing.
• Check the test printout for print quality problems.
3 . Check the transfer charger assembly.
CAUTION: Be careful not to break the charger and guide wires
while cleaning the transfer charger.
• Take out the transfer charger and clean it with a brush or a dry
cloth.
• Be sure to clean the transport rollers.
CAUTION: Do not expose the drum to light for more than five
minutes. Print quality can deteriorate.
• If the transfer charger is badly soiled, clean it with a cloth
slightly moistened with water and then with a dry cloth.
4 . Check the fuser heat roller cleaner for paper dust and dirt build-up.
• Remove the fuser heat roller cleaner from the fuser.
• Remove deposits of paper dust and toner from the cleaning felt. A
firm bristled brush may help.
LaserWriter Pro 810 Nov 93 Preventive Maintenance/3-3
5. Check the registration roller and transport chute.
• Clean them with a brush and dry cloth.
• If they are badly soiled, clean them with a cloth slightly moistened
with water and then with a dry one.
NOTE: Do not leave any rollers dirty. Dirty rollers can cause
print quality and paper handling problems.
6 . Check the fan exhaust inlet.
• If the top cover is removed during maintenance, use a brush to
remove the dirt, toner, and paper dust from the fan exhaust.
7. Recheck printer operation.
• Make several more test prints.
• Check again for print quality, paper feed, and abnormal noises.
8 . Turn the printer off and on to enter the normal mode.
9 . Make a final print test by sending data from the users system.
1 0 . Report to the user any potential or real problems that you found.
LaserWriter Pro 810
Section 4: Take Apart Procedures
LaserWriter Pro 810 Nov 93 Take Apart/4-2
GENERAL
Section 4 does not cover all printer parts. Some parts are omitted because
they require neither adjustment nor special consideration in removing or
installing them. If no Take Apart procedure is provided in this section,
carefully check an installed part before removing it. For plug and
connector locations, see the figures and table at the end of this section.
CAUTION: Turn the printer off and unplug the power cord before starting
any Take Apart procedure.
Recommended Tools
The only tools needed to remove or install any assembly are:
1 . Screwdrivers, Philips head, several sizes and lengths (magnetized
would be useful).
2. Chip puller.
3. Blade screwdriver (various sizes).
4. Wire cutters.
LaserWriter Pro 810 Nov 93 Take Apart/4-3
LIST OF TAKE APART PROCEDURES
POWER CORD COVER 4 - 5
TOP COVER 4 - 7
FRONT COVER 4 - 8
LEFT COVER 4 - 9
RIGHT COVER 4-10
REAR COVER 4-11
ELECTRICAL BOX COVER 4-12
TRANSFER CHARGER/DETACK SAW ASSEMBLY 4-13
PAPER TRANSFER UNIT 4-14
REGISTRATION CLUTCH 4-15
PRE-REGISTRATION SENSOR 4-16
TRANSPORT CLUTCH (TRAY 1) 4-17
PAPER FEED ROLLER ASSEMBLY 4-18
PAPER FEED SOLENOID (TRAY 1) 4-19
PAPER OUT SENSOR (TRAY 1) 4-20
PAPER SIZE SENSOR (TRAY 1) 4-21
OUTER TURN-CHUTE ASSEMBLY 4-22
INNER TURN-CHUTE ASSEMBLY 4-23
TRANSPORT CHUTE ASSEMBLY 4-24
FUSER UNIT 4-25
FUSER BULB 4-27
FUSER THERMOSTAT 4-28
FUSER TEMPERATURE SENSOR 4-29
PAPER EXIT SENSOR 4-30
OUTER EXIT-CHUTE ASSEMBLY 4-31
DIRECTION CHUTE 4-32
INNER EXIT-CHUTE 4-33
EXIT ROLLER ASSEMBLY 4-34
BELT (FUSER AREA) 4-35
LASER SCANNER UNIT 4-36
ERASE ASSEMBLY 4-37
TONER SENSOR 4-38
TONER SENSOR BRACKET 4-39
LaserWriter Pro 810 Nov 93 Take Apart/4-4
EP CARTRIDGE SENSOR BRACKET 4-40
EP CARTRIDGE SENSOR 4-41
FUSER FAN 4-42
DRIVE UNIT 4-43
LOW VOLTAGE POWER SUPPLY (LVPS) 4-45
CONTROL PANEL ASSEMBLY 4-46
HIGH VOLTAGE POWER SUPPLY (HVPS) 4-48
DC CONTROLLER 4-49
I/O CONTROLLER 4-50
FEEDER UNIT 4-52
LOWER CHUTE ASSEMBLY 4-53
PAPER OUT SENSOR (TRAY 2 & 3) 4-54
PAPER FEED ROLLER ASSEMBLY 4-55
PAPER FEED SOLENOID (TRAY 2 & 3) 4-56
PAPER SIZE SENSOR (TRAY 2 & 3) 4-57
OUTER TURN-CHUTE ASSEMBLY 4-58
INNER TURN-CHUTE ASSEMBLY 4-59
MULTI MEDIA POWER FEEDER 4-60
TOP COVER (MULTI MEDIA POWER FEEDER) 4-61
TRAY ASSEMBLY (MULTI MEDIA POWER FEEDER) 4-62
MULTI MEDIA FEEDER PCB 4-63
PAPER FEED SENSOR (MULTI MEDIA POWER FEEDER) 4-64
PAPER OUT SENSOR (MULTI MEDIA POWER FEEDER) 4-65
MOTOR ASSEMBLY (MULTI MEDIA POWER FEEDER) 4-66
FEED ROLLER ASSEMBLY (MULTI MEDIA POWER FEEDER) 4-67
TAKE-AWAY ROLLER ASSEMBLY(MULTI MEDIA POWER FEEDER) 4-68
RETARD ASSEMBLY (MULTI MEDIA POWER FEEDER) 4-69
FAX CARTRIDGE INSTALLATION 4-70
PLUG/CONNECTOR LOCATIONS 4-73
LaserWriter Pro 810 Nov 93 Take Apart/4-5
POWER CORD COVER
Removal To remove the power cord cover:
1 . Carefully pull the rear end of the power cord cover away from the side
of the printer. Use a coin, or similar object, if needed, to pry the
cover loose.
2 . Slide the whole cover toward the front of the printer until it can be
removed.
POWER
CORD
COVER
FIGURE 4-1. POWER CORD COVER REMOVAL
Installation To install the power cord cover:
1 . Lay the power cord along the base of the printer. Be sure the power
cord is secured by the hooks provided
POWER
CORD
HOOKS
FIGURE 4-2. POWER CORD COVER INSTALLATION
COVER
LaserWriter Pro 810 Nov 93 Take Apart/4-6
2 . Attach the front of the power cord cover to the printer.
3 . Carefully press on the rear end of the cover to lock it in place.
LaserWriter Pro 810 Nov 93 Take Apart/4-7
TOP COVER
Removal To remove the top cover:
1 . Turn off the printer and unplug the power cord from the electrical
outlet.
2. Open the top cover. Remove the EP cartridge and put it in a safe place.
3. Raise the top cover as far as possible.
4 . Loosen the two front screws with the silver flanges.
5 . Push back on the top cover and then lift it upward to remove it.
TOP
COVER
COVER
SCREWS
FIGURE 4-3. TOP COVER REMOVAL
Installation To install the top cover:
Reverse the removal procedure.
CAUTION: Be sure that the hooks on the rear of the cover are engaged with
the frame.
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