Canon LBP-CX Series User manual

SERVICE
MANUAL
REVISION 2
Canon
JULY 1985 RYB-8301-020
COPYRIGHT BY CANON INC. CANON LBP-CX SERIES REV.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPONJ

Copyright © by Canon Inc.
1985
Printedin Japan
lmprime au Jap_on
Use of this manual should be
strictly supervised
to avoid dis-
closure
of confidential infor-
mation.
Prepared by
REPROGRAPHIC PRODUCTS QUALITY ASSURANCE DIVISION
CANON INC.
7-1 Nishi-Shinjuku 2-chome, Shinjuku-ku, Tokyo 160, Japan
COPYRIGHT © BY CANON INC. CANON LBP-CX SERIES REY.2 JULY 1985 PRINTED IN JAPAN (IMPHIME AU JAPONJ

INTRODUCTION
This service manual contains basic information required for after-sale service of laser beam printers (240
raster lines/inch and 300 raster lines/inch models). This information is vital to the serviceman in maintaining high
printing quality and performance
of the printer. The content of this manual may be revised as a result of product
modification. There revisions are detailed in Service Information Bulletins.
Chapter
1: General Description
Features, specifications, operation, and parts
of the printer
Chapter
2: Operation and Timing
A brief description
of the different systems in the printer and their roles in producing a print
Chapter 3: The Electrical System
Printer timing and signals, explanation of selected circuit
Chapter 4: The Mechanical System
Explanation
of mechanical operation, disassembly, reassembly, and adjustment
Chapter 5: Installation
Requirements for a suitable location and installation procedures
Chapter 6: Maintenance and Servicing
Parts replacement schedule, expected service lives of printer parts, and details of periodic servicing
Chapter 7: Troubleshooting
What
to do if the printer malfunctions
Chapter 8: Appendix
COPYRIGHT © BY CANON INC. CANON LBP-CX SERIES REY.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPON)
III

TABLE OF CONTENTS
CHAPTER 1 GENERAL DESCRIPTION
I. FEATURES .................. 1- 1 IV. PARTS OF THE PRINTER
..... 1- 4
II. SPECIFICATIONS
............. 1- 2
V. OPERATION ................. 1- 6
III. SAFETY INFORMATION
...... 1- 3
CHAPTER 2 OPERATION AND TIMING
I. BASIC OPERATION ........... 2- 1 III. PRINT UNIT ................. 2- 6
II. LASER/SCANNER
............ 2- 4 IV. SYSTEM INTERFACE ......... 2-17
CHAPTER 3 THE ELECTRICAL SYSTEM
I. OUTLINE OF THE ELECTRICAL
SYSTEM .................... 3- 1
II. REFERENCE LISTS
........... 3- 2
Ill. PRINT PROCESS ............. 3-14
IV. LASER/SCANNER ............ 3-21
V. CIRCUIT DIAGRAMS
BY FUNCTION ............... 3-24
VI.
POWER SUPPLIES ............ 3-51
VII. TIMING CHART FOR
DC
CONTROLLER INPUTS/
OUTPUTS
................... 3-54
CHAPTER 4 THE MECHANICAL SYSTEM
I. EXTERNALS ................. 4- 1
II. DRIVE SYSTEM
.............. 4- 6
III. PAPER TRANSPORT
SYSTEM .................... 4- 7
IV. EXPOSURE SYSTEM .......... 4-15
V. ELECTROSTATIC IMAGE/
DEVELOPING/CLEANING
SYSTEM .................... 4-17
VI. FIXING
SYSTEM ............. 4-20
VII. ELECTRICAL COMPONENTS
... 4-25
CHAPTER 5 INSTALLATION
I. INSTALLATION III. STORING
AND HANDLING EP
SUGGESTIONS ............... 5- 1 CARTRIDGES
................ 5- 7
II. UNPACKING
AND
INSTALLATION .............. 5- 2
CHAPTER 6 MAINTENANCE AND SERVICING
I. EXPECTED SERVICE LIFE OF IV. SERVICE CHECKPOINTS ...... 6- 5
CONSUMABLES ... , .......... 6- 1
V. CUSTOMER MAINTENANCE ... 6- 7
II.
UST OF TOOLS ............. 6- 2
III. LIST OF LUBRICANTS,
CLEANERS
.................. 6- 4
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v

CHAPTER 7 TROUBLESHOOTING
I. INTRODUCTION
A. Initial Check .................. 7- 1
B. Basic Procedure ............... 7- 1
H. CHECK/ADJUSTMENT
A. Printer Driver and Laser Driver
Checker Operation ............. 7- 2
B. Image Adjustment
1. Basic image adjustment
......... 7- 3
2. Adjusting the height of the transfer
corona wire
.................. 7- 3
C. Mechanical Adjustment
1. Adjusting the cassette spring
lifting force
.................. 7- 3
2. Adjusting the fixing rollers
(nip width)
................... 7- 3
D. Electrical Adjustment
1. LEDs and VR settings
.......... 7- 5
2. Checking the DC controller and AC
driver (AC controller and the fixing
roller heater safety circuits)
...... 7- 5
3. Adjusting laser power ........... 7- 7
lli. IMAGE DEFECTS
A. Examples oflmage Defects ...... 7-13
B. How to Read the Troubleshooting
Tables
....................... 7-14
C. Troubleshooting Image Defects
I-1. Light image
................ 7-15
I-2. Dark image
................. 7-16
I-3. Blank
print ....•............ 7-17
1-4. Black image ................ 7-18
I-5. Stained separation strip
....... 7-18
I-6. Stains
on back of paper ....... 7-19
I- 7. Dark vertical lines
(paper feed direction)
......... 7-19
I-8. Sharp horizontal black lines (cross
feed direction)
.............. 7-20
I-9. Vertical fogged stripes
(paper feed direction)
......... 7-20
I-10. Horizontal fogged stripes
(cross feed direction)
......... 7-20
I-11. White horizontal lines or other
shapes on a black print
........ 7-21
I-12. Thin vertical white lines
or stripes
(paper feed direction)
......... 7-21
1-13. Faulty registration ........... 7-22
I-14. Poor fixing
................. 7-22
I-15. Distortion
.................. 7-23
I-16. Waviness
................... 7-23
IV. TROUBLESHOOTING
MALFUNCTIONS
M-1. There is no power ............ 7-24
M-2. The main
motor does not
rotate ..................... 7-27
M-3. The high-voltage power supply does
not provide power ........... 7-27
M-4. The fixing roller heater does
not
operate .................... 7-28
M-5. Cannot feed paper manually
.... 7-29
M-6. Paper
is not fed from
the cassette
................. 7-30
M-7. Jam are detected when there are
no jams
.................... 7-31
M-8. Jams are
not detected ......... 7-31
M-9. The PAPER OUT indicator lights
when there
is still paper ....... 7-32
M-10. The PAPER OUT indicator does
not light when there is no
paper
..................... 7-32
M-11. The preconditioning exposure lamps
do
not light ................ 7-34
M-12. Laser, scanner malfunction
..... 7-34
M-13. Heater malfunction
.......... 7-35
M-14. All LEDs on the display panel
do
not light ................ 7-36
M-15. The READY/WAIT indicator does
not stop flashing ............. 7-37
M-16. The READY/WAIT indicator does
not light ................... 7-37
M-17. Printing does
not start when a TRUE
print command (PRNT)
is input .... ' ................ 7-37
V. PAPER TRANSPORT PROBLEMS
(A jam occurs every time paper is fed.)
A. Paper Jams
T-1. Manual feed unit
..... ~ ...... 7-39
T-2. Cassette pickup assembly ...... 7-39
T-3. Separation/feeder
unit ........ 7-39
T-4. Fixing/delivery area
.......... 7-40
B. Incomplete Feed
T-1. Sheets stuck together
......... 7-40
T-2. Wrinkles ................... 7-40
VI
COPYRIGHT © BY CANON INC. CANON LBP·CX SERIES REV.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPONI

APPENDIX
l LOCATIONS OF ASSEMBLIES,
UNITS ...................... A-1
II. GENERAL CIRCUIT
DIAGRAM . . . . . . . . . . . . . . . . . . . A-3
HI. WIRING DIAGRAM . . . . . . . . . . . A-5
IV. DC CONTROLLER
A. DC Controller Circuit Diagram . . . . A- 7
B. DC ControllerPCB: Connector
Locations and Signals ........... A-10
V. HIGH-VOLTAGE POWER SUPPLY
CIRCUIT DIAGRAM
........... A-11
VI. DC POWER SUPPLY AND MAIN
MOTOR DRIVER CIRCUIT
DIAGRAM ................... A-12
VII. AC DRIVERCIRCUIT DIAGRAM
(AC CONTROLLER AND
FIXING
ROLLER HEATER SAFETY
CIRCUIT) ................... A-12
VIII. VARISTOR AND PRECONDITIONING
EXPOSURE LAMPS AND PRINT
COUNTER CIRCUIT
. DIAGRAMS .................. A-13
IX. EXPANSION RAM CIRCUIT
DIAGRAM ................... A-14
X. DCCONTROLLERPCB
LAYOUT .................... A-15
XI. DC POWER SUPPLY & MAIN
MOTOR DRIVER PCB
LAYOUT
.................... A-16
XII.
AC DRIVER PCB LAYOUT
(AC CONTROLLER PCB,
FIXING ROLLER HEATER
SAFETY PCB) ................ A-17
xm. VARISTOR PCB LAYOUTS ..... A-18
XIV. PRECONDITIONING EXPOSURE
LAMPS AND PRINT COUNTER
PCB LAYOUT ................ A-18
XV. EXPANSION
RAM PCB
LAYOUT .................... A-19
XVI.LABELS
..................... A-23
COPYRIGHT © BY CANON INC. CANON LBP-CX SERIES REY.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPOHJ
VII

I. FEATURES
A. This is a non-impact (low-noise) printer based
on electrophotography, e~ectronics, and laser
technology.
B. This printer produces high-quality prints with
plain paper.
C. This printer is compact and easy to carry. This
allows the printer
to be placed near the customer.
D. This printer combines a photosensitive drum,
toner hopper, developing cylinder and drum
cleaner in a single assembly called an
"EP
cartridge." This allows maintenance servicing and
periodic replacement of parts and consumables
simply by replacing the EP cartridge. The custom-
er can do this, saving time and the cost of the
serviceman.
E. This printer body can be• opened/closed with a
simple one-handed action, which allows easy clear-
ing
of paper jams.
F. This printer has been designed with full provision
made for laser safety.
It has been certified by the
U.S. Bureau of Radiological Health (BRH) as
conforming with their standards for laser safety.
G. This printer employs a semiconductor laser which
is much more
compact than an ordinary gas laser,
and which is driven directly by control signals.
H. This printer can be used
as an on-line or off-line
output unit for office computers, word processors,
graphic displays, facsimiles,
and other systems.
COPYRIGHT © BY CANON INC. CANON LBP-CX SERIES REV.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPON)
1-1

II. SPECIFICATIONS
1. Type: Desk-top page printer
2. Printing method: Electrophotography (single
component-dry process), laser-
beam scanning
3. Print speed:
Cassette feed
6.9 (Legal-size) sheets/minute
8.1 (A4, Letter, and
other sizes) sheets/minute
Manual feed
S. l (all sizes) sheets/minute
4. Time for first print: 18 sec.
or less (cassette feed)
22 sec. or less (manual feed)
[Definition: the interval between receiving a print
command from the external device (when the
printer is READY) and delivery
of one A4/Letter
print]
S. Warm-up (wait) time:
Less than 2 min. from power ON (20°C
ambient; specified line voltage)
6. Optical system:
6-1 Laser: Semiconductor laser
6-2 Scanning system: Rotating six-faced mirror
6-3 Scanning pitch:
Horizontal: Selectable
(0- 300 dots/inch)
Vertical: 240 raster lines/inch or 300
raster lines/inch (2 types
of
printer)
7. Printing system
7-1 Process speed: 47.1 mm/sec.(l.8S in./sec.)
7-2 Photosensitive drum:
Two-layer structure; conductive base,
photoconductive upper layer (OPC)
7-3 Charging: Corona
7-4 Exposure method: Laser scanning system
7-S Development:
Single-component, dry toner
Toner Projection Development System
7-6 Paper supply: Manual
or cassette feed
7- 7 Image transfer: Corona transfer
7-8 Separation: Fixed belt and roller
7-9 Fixing method:
Heated roller
(11
SV, 220V: SOOW, 240V: 600W)
7-10 Toner supply: Replaceable EP cartridge
8. Paper: Plain paper (manufacturer-approved)
Cassette feed;
60g/m
2
-80g/m
2
[16lb-2llb]
Manual feed;
Single-side
print
40g/m
2
-128g/m
2
[lllb-33lb]
Double-sided print
60 g/m2 -128 g/m2 [ 16 lb -33 lb]
9. Cassette feed
9-1 Maximum paper load:
Cassette loading depth
is 10 mm (0.4 in.),
max.
e.g. l
00 sheets of 80 g/m
2 paper
9-2 Cassette:
Paper size mm inches Cassette
A4
210x297
8.3 x 11.7 A4
BS
182 x 2S7 7.2 x 10.l
BS
Legal
216x3S6
8.S x 14.0 Legal
Letter 216 x 279
l0. Manual feed
10-1 Paper size:
8.S 'X 11.0 Letter
From 100 mm (H) x 140 mm (V)
to 216 mm (H) x 3S6 mm (V)
10-2 Printing on double sides:
Possible, using manual feed
11. Tray capacity: About 20 sheets (80 g/m2)
12. Power consumption
Operating:
Max. 690W (11 SV, 220V),
790W (240V)
Standby: Typical avg, 120W
13. Environment
13-1 Temperature: 10°C - 32.5°C
(S0°F -90.S°F)
13-2 Humidity: 20% -80%RH
14. Noise level: Under SS dB (A) (during printing)
Under 4S dB (A) (during standby)
1
S. Dimensions:
47S mm
(W) x 290 mm (H) x 41S mm (D)
18.7 in. (W) x 11.4 in. (H) x 16.3 in. (D)
16. Weight:
2S kg (SS lb) (unloaded)
17. Line voltage requirements
Voltage (V) ±10% Freq. (Hz)
240 raster lines/inch model
llS
60
220
so
240
so
300 raster lines/inch model
llS
60
220
so
240
so
Specifications are subject to change due to
product improvements.
1-2
COPYRIGHT © BY CANON INC. CANON LBP-CX SERIES REV.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPON)

Ill. SAFETY INFORMATION
A. Laser Safety
This
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. This means that the printer does
not produce hazardous laser radiation.
Since radiation
emitted inside the printer is
completely confined within protective housings and
external covers, the laser beam cannot escape from
the machine during
any phase of user operation.
B. CDRH Regulations
Center for Devices and Radiological Health
(CDRH)
of the U.S. Food and Drug Administration
implemented regulations for laser
products on August
2, 1976. These regulations apply
to laser products
manufactured from August 1, 1976. Compliance
is
mandatory for products marketed in the United
States. The label shown below indicates compliance
with
the CDRH regulations and must be attacl).ed to
laser products marketed in the United States.
Canon LBP-CX
MANUFACTURED:
CANON U.S.A., INC.
ONE CANON PLAZA, LAKE SUCCESS, N.Y. 11042, U.S.A.
THIS PRODUCT CONFORMS WITH DHHS RADIATION PER·
FORMANCE STANDARD, 21CFR CHAPTER 1 SUBCHAPTER J.
THIS EQUIPMENT COMPLIES WITH THE REQUIREMENTS
IN PART 15 OF FCC RULES FOR A CLASS A COMPUTING
DEVICE. OPERATION OF THIS EQUIPMENT IN A RESIDEN·
TIAL AREA MAY CAUSE UNACCEPTABLE INTERFERENCE
TO RADIO AND TV RECEPTION REQUIRING THE OPERATOR
TO TAKE WHATEVER STEPS ARE NECESSARY TO CORRECT
THE INTERFERENCE.
Figure 1-1
Note: The information above is subject to change
depending
on printer models.
C. Additional Information
When servicing or adjusting the optical system of
the printer, be careful not to place screwdrivers or
other shiny objects in the path of the laser beam.
Also, accessories such
as watches and rings should be
removed before working
on the printer. The reflected
beam, though invisible, can
permanently damage your
eyes.
Since
the beam is invisible, the following label is
attached
to the insides of covers where there is danger
of exposure to laser radiation:
DANGER-INVISIBLE LASER RADIATION WHEN OPEN.
AVOID DIRECT EXPOSURE TO BEAM.
ATTENTION-RAYONNEMENT LASER INVISIBLE SI OUVERT.
DANGEREUX DE REGARDER A L'INTERlEUR.
VORSICHT-UNSICHTBARE LASERSTRAHLEN WENN GEOFFNET.
NICHT HINEINSEHEN.
Figure 1-2
Some warning labels are
stuck in the printer
wherever special service attention is needed. Obey the
instructions on the labels. For details, see Appendix
XX, where
the warning· labels in the printer are
shown.
According
to West German standard VDE0836
(VDE-Bestimmung fiir die elektri:sche Sicherheit von
Lasergeriiten und Anlagen), printer servicing requires
at least two servicement.
COPYRIGHT © BY CANON INC. CANON LBP-CX SERIES REY.2 JULY 1985 PRINTm IN JAPAN (IMPRIME AU JAPON)
1-3

IV. PARTS OF THE PRINTER
A. External View
I. Power switch
2. Control panel
3.
Front panel
4. Top cover
5. Right door
6. Right panel
7. Print tray
8. Cassette
9. Upper unit release
Figure
1-3
10. Manual feed tray
11. Rear panel
12. Paper pickup guide
13. Test switch
14.
1/0 connector
15. Print density adjustment dial
16. Power cord
17. Left panel
Figure 1-4
18. EP cartridge
19. Upper main body
20. Lower main body
21. Pedestal
Figure 1-5
1-4
COPYRIGHT © BY CANON INC. CANON LBP-CX SERIES REY.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPONJ

B. Cross Sectional View
\ I i
@®@@®®@@35
Figure 1-6
D Indicates
EP cartridge 22. Upper manual pickup roller
1.
Front cover 23. Video controller
PCB
2.
Duct 24. Rear panel
3.
Font cartridge 25. Manual paper feed guide
4. Fan 26. Manual feed tray
5.
DC controller PCB 27. Lower manual pickup roller
6. Control panel 28. Cassette feed roller
7.
Control panel PCB 29. Registration
shutter
8. Top cover 30. Feed roller
9.
Ozone filter 31. Cassette pickup roller
10. Cleaning blade 32. Transfer guide assembly
11. Preconditioning exposure lamps 33. Transfer corona assembly
12. Primary corona assembly 34. Separation belt
13.
Laser beam-blocking shutter 35. Separation feeder
unit
14. Beam-to-drum mirror 36. Paper detection arm
15. Stationary mirror 37. Pinch roller (separation feeder
unit)
16. Photosensitive drum 38. Thermistor
17. Developing cylinder 39. Fixing roller cleaner felt
18. Focusing lenses 40. Upper fixing roller
19. Expansion
RAM PCB (A2 model only) 41. Lower fixing roller
20. Scanning mirror 42. Delivery roller
21. Scanner
motor
43. Print tray
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1-5

V. OPERATION
A. Display Unit and Print Density Adjustment Dial
1. Display unit
2 3 4 5
Figure 1-7
CD READY/WAIT indicator (green)
This green LED flashes when
the printer is in the
WAIT state or during TEST printing, and lights
steadily when
the printer is ready to operate.
Q) PAPER OUT indicator (yellow)
With
paper feed from a cassette, this yellow LED
lights steadily if
the cassette is empty or not in
place. With manual feed, this yellow LED lights
steadily
if there is no paper on the manual feed
tray.
@JAM indicator (yellow)
This yellow LED lights steadily
if paper has jam-
med inside the printer. Printing is not possible
until the jammed paper is removed (and the upper
half closed).
@ Indicator A (yellow)
This yellow LED lights steadily
if one of the fol-
lowing malfunctions occurs:
• The scanner motor is not rotating at the correct
speed.
• The laser beam is not scanning at the specified
speed
or the laser intensity drops under the
specified value. (BD timing is not correct.)
G) Indicator B (yellow)
This yellow LED lights steadily
if the temperature
of the laser chip or the upper fixing roller is not
correct.
Note:
These LEDs are all off if the EP cartridge is not
inserted properly.
If the external device sends data to the printer, but
the laser beam does not scan at the specified
speed,
or if the laser is not at the specified
intensity,
the printer is not ready, and the
READY/WAIT indicator goes out. The printer
informs the external device of this, telling it the
number of pages to retransmit. The external
device sends a DATA RETRANSMISSION
REQUEST RELEASE command, telling
the
printer to ready itself for data retransmission and
printing.
If the laser beam then does not scan at
2. Test switch
The test switch is located on the left panel (see
Figure 1-4). This switch is used
to test components
and functions of the printer. When this switch is
pressed with the photosensitive drum stopped and the
READY/WAIT indicator lit, one test print composed
of vertical lines is output.
The test switch is a momentary contact switch.
Test prints
continue to be output as long as the
switch is pressed. The READY/WAIT indicator
flashes while test prints are being made.
3. Print density adjustment dial
The print density adjustment dial is located on
the left panel (see Figure 1-4). The dial ·is used to
adjust the intensity of the finished print. Turning the
dial counterclockwise increases print density (and
vice versa).
Figure 1-8
the specified speed, or if the laser is not at the
specified intensity
for more than one second,
indicator A lights.
If there is no error in the printer, and the printer
enters
the PAUSE state from a PAUSE command
input from the external device, all LEDs go out.
If the main notor malfunctions all LEDs go out.
1-6
COPYRIGHT © BY CANON INC. CANON LBP-CX SERIES REV.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPDNI

B. Operating Procedure
1. Flowchart (basic operation)
Connect the external
device.
Switch the power ON. J.
Performs printing directed by the
external device.
Yes
No
Yes
END
Press the test switch.
No
Call the Service repre-
sentative.*
Figure 1-9
Yes
Remove
the jam.
Yes
Replenish paper.
*In this case indicator A or Blights.
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1-7

2. Manual feed
Manual feed is useful for making prints on paper
sizes other than the cassette size. Manual feed is also
used
for overlay and double-sided prining. (excluding
B4 paper)
l) Set the printer to manual feed through the exter-
nal device.
2) Confirm
that the READY/WAIT indicator goes off
and the PAPER OUT indicator lights. Insert the
paper lengthwise along the manual feed guide
with the side
to be printed face up (see Figure
1-9 below).
Note: Do not pull the paper from the manual feed
guide when
the printer begins paper feeding.
Pulling the paper out makes JAM.
Figure 1-10
3) When making prints continuously using manual
feed, the next sheet
of paper should be inserted
after a delay
of about 1.5 seconds or more after
the previous sheet has been completely drawn
into
the printer.
Reference:
Printer throughput is 5.1 sheets/minute (for all
paper sizes), given the following conditions.
• Paper should be fed into the printer between
1.5 seconds and time t (below)
after the pre-
vious sheet has been drawn
into the printer.
Paper size Paper length Time t (sec.)
(mm)
Legal 356 2.0
Letter 279 3.5
A4 297 3.0
BS
257 4.0
Table 1-1 Manual paper feeding (standard sizes)
• When the external device specifies manual feed,
the printer
outputs TRUE PAPER OUT and
NOT READY status signals (RDY goes FALSE)
to the external device through the interface.
Because
of this, the external device should
output a TRUE PRINT command (PRNT
comes TRUE) within 10 ms after the NOT
READY signal becomes FALSE, which means
that paper is on the manual feed guide.
3. Double-sided printing
Double-sided printing is possible using manual
feed. Insert
the paper lengthwise along the guide
with
the side to be printed face up.
Note: If the paper curls on the first pass, uncurl it
before inserting it into the printer again.
1-8
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