Canon IR5000 - iR B/W Laser How to use

FY8-23BB-000
JULY 2000
iR5000/iR6000
REVISION 0
This publication is printed on
100% reprocessed paper.
PRINTED IN JAPAN (IMPRIME AU JAPON) 0800M1.25-1 COPYRIGHT
© 2000 CANON INC. CANON iR5000/iR6000 REV.0 JULY 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
SERVICE
HANDBOOK

Application
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this reason, there may be information in this manual that does not apply to your locality.
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Use of this manual should be strictly supervised to avoid disclosure of
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COPYRIGHT © 2000 CANON INC.
Printed in Japan
Imprimé au Japon
COPYRIGHT © 2000 CANON INC. CANON iR5000/iR6000 REV.0 JULY 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
Prepared by
Office Imaging ProductsTechnical Support Division
Office Imaging Products Quality Assurance Center
CANON INC.
Printed in Japan
REVISION 0 (JULY 2000) (18723/22109)
5-1, Hakusan 7-chome,Toride-shi, Ibaraki 302-8501 Japan

CONTENTS
Contents
CHAPTER 1 MAINTENANCE AND INSPECTION
1. Periodical Servicing Chart ..............1-1
1.1 Reader Unit................................1-1
1.2 Printer Unit ................................1-1
1.3 Cleaning the photosensitive
drum ........................................... 1-4
2. Periodically Replaced Parts .............. 1-5
2.1 Guide to Timing of
Replacement ............................... 1-5
2.2 Reader Unit ................................ 1-5
2.3 Printer Unit ................................ 1-6
3. Consumables and Durables.............. 1-7
3.1 Guide to Timing of
Replacement ............................... 1-7
3.2 Reader Unit ................................ 1-7
3.3 Printer Unit ................................ 1-8
3.4 Side Paper Deck ......................... 1-9
4. Points to Note for Periodical
Servicing ........................................ 1-10
5. ImageAdjustment Basic
Procedure ....................................... 1-11
5.1 Making Pre-Checks ................. 1-11
5.2 Making Checks on the Printer
Unit (1/2) ................................. 1-12
5.3 Making Checks on the Printer
Unit (2/2) ................................. 1-13
5.4 Making Checks on the
Reader Unit .............................. 1-14
CHAPTER 2 STANDARDS AND ADJUSTMENTS
1. Image Adjustments ........................... 2-1
1.1 Standards of Image Position ...... 2-1
1.2 Checking the Image Position ..... 2-2
1.3 Adjusting the Left/Right
Image Margin ............................. 2-2
1.3.1 Cassette 3/4 .......................... 2-2
1.3.2 Left/Right Front Deck .......... 2-3
1.3.3 Manual Feed Tray ................ 2-3
1.3.4 Duplex Feeding Unit ............ 2-4
1.3.5 Side Paper Deck ................... 2-4
1.4 Adjusting the Image Leading
Edge Margin............................... 2-5
1.5 Adjusting the Left/Right
Non-Image Width ...................... 2-5
1.6 Adjusting the Leading Edge
Non-Image Width ....................... 2-6
2. Scanning System .............................. 2-7
2.1 Replacing the Scanner Drive
Cable .......................................... 2-7
2.1.1 Removing the Scanner System
Drive Cable .......................... 2-7
2.1.2 Routing the Scanner
Drive Cable .......................... 2-9
2.2 Adjusting the Position of the
Scanner Mirror Base ................ 2-10
2.3 After Replacing the Scanning
Lamp ........................................ 2-12
3. Image Formation System ................ 2-13
3.1 Routing the Grid Wire of the
Primary ChargingAssembly .... 2-13
3.2 Routing the Charging Wire of
Charging Assemblies ............... 2-15
3.2.1 Routing the Charging
Wire ................................... 2-15
3.2.2 Adjusting the Heiqht of the
Charging Wire.................... 2-18
3.3 Mounting the Drum Cleaning
Blade ........................................ 2-19
3.3.1 Removingthe Cleaning
Blade .................................. 2-19
3.3.2 Mounting the Cleaning
Blade .................................. 2-20

CONTENTS
3.4 Mounting the Developing
Blade ........................................ 2-22
3.4.1 Removing the Blade Unit ... 2-22
3.4.2 Mounting the Blade ............ 2-22
3.5 Replacingthe PotentialSensor/
Potential Control PCB .............. 2-23
3.5.1 Removing the Potential Sensor/
Potential Control PCB ....... 2-23
3.5.2 Adjusting the Potential
Sensor ................................ 2-25
4. Pickup/Feeding System .................. 2-27
4.1 Orientation of the Deck/Cassette
Pickup Roller ........................... 2-27
4.2 Orientation of the Deck/Cassette
Separation Roller ..................... 2-28
4.3 Orientation of the Feeding
Roller of the Deck/Cassette
Pickup Assembly ...................... 2-28
4.4 Orientation of the Pickup Roller
of the Side Paper Deck ............. 2-29
4.5 Orientation of the Feeding Roller
of the Side Paper Deck ............. 2-30
4.6 Adjusting the Pressure of the
Separation Roller of the Deck/
Cassette .................................... 2-31
4.7 Adjusting the Pressure of the
Separation Roller of the Manual
Feed Tray ................................. 2-32
4.8 Adjusting the Fixing Inlet
Guide Solenoid (SL1) .............. 2-33
4.9 Adjusting the Position of the
Pickup Solenoid (SL3, SL4)
of the Cassette 3/4 .................... 2-34
4.10 Adjusting the Position of the Deliv-
ery Flapper Solenoid (SL5) ..... 2-35
4.11 Adjusting the Position of the Right
Deck Pickup Solenoid (SL6) ... 2-35
4.12 Adjusting the Position of the Left
Deck Pickup Solenoid (SL7) ... 2-36
4.13 Adjusting the Position of the
Reversing Flapper Solenoid
(SL8) ........................................ 2-36
4.14 Adjusting the Position of the
Fixing Web Solenoid (SL9) ...... 2-37
4.14.1 New Fixing Web.................. 2-37
4.14.2 Existing Fixing Web ............ 2-37
4.15 Position of the Side Paper
Deck Pickup Roller Releasing
Solenoid ................................... 2-38
4.16 Attaching the Timing Belt of the
Manual Feed Tray Assembly ... 2-38
4.17 Attaching the Drive Belt .......... 2-39
5. Fixing System ................................ 2-40
5.1 Points to Note When Mounting
the Fixing Heater ...................... 2-40
5.2 Position of the Fixing Inlet
Guide ........................................ 2-40
5.3 Adjusting the Lower Roller
Pressure (nip) ........................... 2-41
5.3.1 Taking Measurements ........ 2-41
5.3.2 Standards ........................... 2-41
5.3.3 MakingAdjustments .......... 2-41
6. Laser Exposure System .................. 2-42
6.1 When Replacing the Scanner
Unit .......................................... 2-42
7. ElectricalParts ................................ 2-43
7.1 When Replacing the CCD
Unit .......................................... 2-43
7.2 When Replacingthe Reader
controller PCB .......................... 2-43
7.3 When Replacing the Main
Controller PCB ......................... 2-44
7.4 When Replacing the HDD
Unit .......................................... 2-44
7.5 When Replacing the DC
Controller PCB ......................... 2-45
7.6 When Replacingthe
High-Voltage PCB .................... 2-46
8. Checking the Surface Potential
Control System ............................... 2-47
8.1 Outline ...................................... 2-47
8.2 Disabling theAuto Control
Mechanism ............................... 2-47
8.3 Zero Level Check ..................... 2-48
8.3.1 Method 1 ............................ 2-48
8.3.2 Method 2 ............................ 2-50
8.4 Checking the Potential
System ...................................... 2-53

CONTENTS
1.1 Clutches ..................................... 3-1
1.1.1 Reader Unit .......................... 3-1
1.1.2 Printer Unit .......................... 3-1
1.2 Solenoids and Switches ............. 3-2
1.2.1 Reader Unit .......................... 3-3
1.2.2 Printer Unit .......................... 3-3
1.3 Motors ........................................ 3-4
1.3.1 Reader Unit .......................... 3-5
1.3.2 Printer Unit .......................... 3-5
1.4 Fans ............................................ 3-6
1.4.1 Reader Unit .......................... 3-7
1.4.2 Printer unit ........................... 3-7
1.5 Sensors ....................................... 3-8
1.5.1 Reader Unit ........................ 3-10
1.5.2 Printer Unit ........................ 3-10
1.6 Lamps, Heaters, and Others ..... 3-12
1.6.1 Reader Unit ........................ 3-13
1.6.2 Printer Unit ........................ 3-13
1.7 PCBs ........................................ 3-14
1.7.1 Reader Unit ........................ 3-15
1.7.2 Printer unit ......................... 3-15
1.8 Variable Resistors (VR), Light-
Emitting Diodes (LED), and
Check Pins by PCB .................. 3-16
1.8.1 Main Controller PCB ......... 3-16
1.8.2 DC Controller PCB ............ 3-17
1.8.3 Reader Controller PCB ...... 3-18
1.8.4 Power Supply PCB ............ 3-18
1.8.5 HVT PCB .......................... 3-19
1.8.6 Drum Heater Control
PCB ................................... 3-19
CHAPTER 4 SERVICE MODE
1. Organization of Service Mode ......... 4-1
1.1 Outline ....................................... 4-1
1.2 Starting Service Mode and
Making Selections ...................... 4-2
1.3 Ending Service Mode ................. 4-3
1.4 Backing Up Service Mode ......... 4-3
1.5 Basic Operations ........................ 4-4
1.5.1 InitialScreen ........................ 4-4
1.5.2 Level 1/Level 2 Screen ......... 4-4
1.5.3 Level 3 Screen ...................... 4-5
2. DISPLAY (control/display mode) .... 4-6
2.1 COPIER ..................................... 4-6
2.2 FEEDER .................................. 4-19
3. I/O (I/O display mode) ................... 4-20
3.1 DC-CON.................................. 4-21
3.2 R-CON..................................... 4-29
3.3 MN-CON................................. 4-31
3.4 FEEDER .................................. 4-33
3.5 SORTER .................................. 4-36
3.5.1 Finisher Block .................... 4-36
3.5.2 Saddle Stitcher Unit ........... 4-41
4. ADJUST (adjustment mode) .......... 4-44
4.1 COPIER ................................... 4-44
4.2 FEEDER .................................. 4-57
CHAPTER 3 ARRANGEMENT AND FUNCTIONS OF
ELECTRICAL PARTS
8.5 Conversion Table for the
Potential Control System .......... 2-55
8.6 Emergency Measures for a
Fault in the Potential Sensor ..... 2-59
9. Checking the EnvironmentSensor ... 2-60
9.1 Procedure ................................. 2-60
9.2 Emergency Measure for a Fault
in the Environment Sensor ....... 2-60
10. Checking the Photointerrupters ....... 2-61
10.1 Using a Meter........................... 2-61
10.2 Using Service Mode................. 2-61
10.3 Check List ................................ 2-61

CONTENTS
1. Error Codes ...................................... 5-1
1.1 List of Error Codes .................... 5-1
1.2 Self Diagnosis of the ADF ....... 5-13
CHAPTER 5 SELF DIAGNOSIS
1.3 Self Diagnosis of the Finisher ... 5-14
1.4 Self Diagnosis of the Saddle
Stitcher ..................................... 5-18
APPENDIX
A. GENERAL TIMING CHART ........ A-1
B. LIST OF SIGNALS/ABBREVIA-
TIONS ............................................. A-3
C. General Circuit Diagram .................. A-9
D. PAPER DECK -G1 GENERAL
CIRCUIT DIAGRAM .................. A-11
E. SHIFT TRAY GENERAL
CIRCUIT DIAGRAM .................. A-12
F. SPECIFICATIONS ...................... A-13
1.1 Copier ...................................... A-13
1.1.1 Type .................................. A-13
1.1.2 Method .............................. A-13
1.1.3 Functions .......................... A-14
1.1.4 Others ............................... A-19
1.2 Paper Deck-G1 ....................... A-22
1.3 Shift Tray-B1 .......................... A-23
G. List of Special Tools...................... A-24
H. List of Solvents/Oils ..................... A-26
4.3 SORTER .................................. 4-58
5. FUNCTION (operation/inspection
mode).............................................. 4-59
5.1 COPIER ................................... 4-59
5.2 FEEDER .................................. 4-75
6. OPTION (settings mode) ............... 4-76
6.1 COPIER ................................... 4-76
6.2 FEEDER .................................. 4-92
6.3 SORTER .................................. 4-92
6.4 BOARD.................................... 4-93
7. TEST (test print mode) .................. 4-94
8. COUNTER (counter mode) ........... 4-98

CHAPTER 1 MAINTENANCE AND INSPECTION
1-1
CHAPTER 1 MAINTENANCE AND INSPECTION
1.Periodical Servicing Chart
Do not use solvents or oils other than those indicated.
1.1 Reader Unit
: Clean : Replace ×: Lubricate : Adjust : Inspect
Intervals
Unit Part Upon every every every every Remarks
installation 250,000 500,000 750,000 1,000,000
Scanner Scanner cable Only at fist
250,000
(inpection/
adjustment).
Optical Scanner rail ×Silicone oil
path (FY9-6011)
Copyboard
glass
No. 1 through
No. 3 mirrors
Scanner
reflecting plate
1.2 Printer Unit
: Clean : Replace ×: Lubricate : Adjust : Inspect
Intervals
Unit Part Upon every every every every Remarks
installation 250,000 500,000 750,0001,000,000
Externals/ Ozone filter
controls (FM3)
Dust-proofing Remove dust
filter (FM2) from surface.
Laser Dust-proof
optical path glass
Charging Charging wire After replace-
assembly (primary, pre- ment, execute
transfer, trans- wire cleaning
fer/separation) 5 times.
1

CHAPTER 1 MAINTENANCE AND INSPECTION
1-2
Intervals
Unit Part Upon every every every every Remarks
installation 250,000500,000750,0001,000,000
Charging Charging wire Replace with
assembly cleaner charging wire
(primary, pre- simulta-
transfer, trans- neously.
fer/separation)
Grid wire
(primary)
Charging
assembly
shielding plate
(each charging
assembly)
Roller
electrode
Primary anti-
stray toner
sheet
Photosensi- Photosensitive Use alcohol
tive drum drum and drum
cleaning pow-
der (CK-
0429); for in-
structions, see
6. “Cleaning
the Photo-
sensitive
Drum.”
Electrode (for ×Clean with
slip ring of alcohol;
1) electrode,
drum heater) 2) protruding
wall of elec-
trode (where
FY9-6008 is
applied).
· Charge col-
lecting brush
Developing Developing
assembly cylinder
Developing
assembly roll

CHAPTER 1 MAINTENANCE AND INSPECTION
1-3
Intervals
Unit Part Upon every every every every Remarks
installation 250,000500,000750,0001,000,000
Developing Anti stray-
assembly toner sheet
Cleaner Side scraper
Toner dish
(rear, front)
Fixing Inlet guide
assembly Web
Oil dish
Thermistor
Sub thermistor
Thermal switch
Delivery Separation
assembly claw (upper,
lower)
Waste tonerWaste toner Inspect case,
collection box and remove
area toner.
Pickup/ Transfer guide
feeding Registration
assembly roller (upper,
lower)
Feeding belt
Feeding rollers

CHAPTER 1 MAINTENANCE AND INSPECTION
1-4
1.3 Cleaning the photosensitive drum
Do not rotate the magnet roll
during work. Otherwise, waste
toner may fall through the
cleaner assembly.
1) Slide out the process unit. (Be sure to
place the drum protective sheet over the
fixing/feeding unit.)
2) Take out the photosensitive drum.
3) Moisten lint-free paper [1] with 5 to 10
cc of alcohol [2]; then, pour 0.2 to 0.3 g
of drum cleaning powder (CK-0429) [3]
on the lint-free paper.
4) While butting the lint-free paper rela-
tively strongly against the photosensi-
tive drum, wipe the surface of the drum
from the front to the rear and from the
rear to the front. F01-103-01
• Keep the widths of cleaning to
5 to 10 cm in the peripheral
direction of the drum.
• Move the lint-free paper back
and forth 15 to 20 times over a
single area.
Forcing the lint-free paper will
not affect the life of the drum.
5) When the alcohol has evaporated, dry
wipe the surface with lint-free paper. If
the area is uneven, go back to step 4),
and increase the back-and-forth move-
ments.
6) Rotate the drum for the width (5 to 10
cm), and repeat steps 3) through 5) until
the entire area of the surface has been
cleaned.
F01-103-02
[1]
[2]
[3]
CK-0429
5 to 10cm

CHAPTER 1 MAINTENANCE AND INSPECTION
1-5
2.Periodically Replaced Parts
Some parts of the machine must be replaced on a periodical basis to ensure a specific
level of machine performance. (Once they fail, the consequences are likely to be consider-
able.)
Whenever possible, schedule the replacement to coincide with a scheduled visit to the
user’s.
2.1 Guide to Timing of Replacement
You can check the timing of replacement for periodically replaced parts in service mode:
COPIER>COUNTER>PRDC-1.
2.2 Reader Unit
The reader unit does not have parts that require periodical replacement.

CHAPTER 1 MAINTENANCE AND INSPECTION
1-6
2.3 Printer Unit
As of June 2000
No. Part name Part No. Q’ty Life Remarks
1 Primary, pre-transfer, transfer, FB4-3687 AR 500,000*
separation charging wire
2 Primary grid wire FY1-0883 AR 500,000
3 Primary charging wire FF5-6883 2 500,000 Strengthened polish
cleaner 1 type (blue)
4 Primary charging wire FF2-6884 2 500,000 Strengthened polish
cleaner 2 type (blue)
5 Transfer charging wire FF5-6883 1 500,000 Strengthened polish
cleaner 1 type (blue)
6 Transfer charging wire FF5-6884 1 500,000 Strengthened polish
cleaner 2 type (blue)
7 Separation charging wire FF5-3090 1 500,000
cleaner
8 Pre-transfer charging wire FF5-3090 1 500,000
cleaner
9 Main thermistor FH7-7529 1 500,000
10 Sub thermistor FG5-8812 1 500,000
11 Ozone filter FB5-5570 1 500,000
12 Thermal switch FH7-7154 1 1,000,000
*Do not use the old type (gold plated). After replacement of the charge wire, be sure to
execute wire cleaning in service mode. (COPIER>FUNCTION>CLEANING>WIRE-
CLN)
T01-203-01
Memo
The indicated life of each part is for reference only, and is subject to the site
environment and the conditions of use.

CHAPTER 1 MAINTENANCE AND INSPECTION
1-7
3.Consumables and Durables
Some parts of the machine are likely to require replacement because of wear or damage
once or more over the period of machine warranty. Replace them when they fail.
3.1 Guide to Timing of Replacement
You can check the timing of replacement for durables in service mode:
COPIER>COUNTER>DRBL-1.
3.2 Reader Unit
The reader unit does not have parts that are classified as “consumables” or “durables.”

CHAPTER 1 MAINTENANCE AND INSPECTION
1-8
3.3 Printer Unit
As of June 2000
No. Part name Part No. Q’ty Life Remarks
1 Pickup/feeding roller FB1-8581 1 120,000
(manual feed roller)
2 Separation roller FB5-0873 1 120,000
(manual feed tray)
3 Pickup roller FF5-1220 8 250,000 Each holder uses 2 pc.
4 Pickup/feeding roller FF5-9779 8 250,000 Each holder uses 2 pc.
(deck, cassette)
5 Separation roller FB2-7777 4 250,000
(deck, cassette)
6 Cleaner separation claw FB2-6899 3 500,000
7 Pre-separation charging FA4-1867 1 500,000
assembly scraper
8 Fixing upper roller FB4-3690 1 500,000
9 Fixing lower roller FB5-3619 1 500,000
10 Fixing web FY1-1157 1 500,000
11 Insulating bush (front/rear) FB5-3613 2 500,000 Replace simultaneously
with fixing upper roller.
12 Delivery upper separation claw FB5-3625 6 500,000
13 Delivery lower separation claw FA2-9037 2 1,000,000
14 Developing cylinder FG5-8235 1 1,000,000
15 Developing assembly roll FB2-6933 2 1,000,000
16 Cleaning blade FA4-1827 1 1,000,000 Both edges are used;
each for 500,000; apply
toner upon replacement.
17 Primary corona assembly FG6-5927 1 1,000,000
18 Transfer/separation corona FG6-5911 1 1,000,000
assembly
19 Pre-transfer corona assembly FG6-5045 1 1,000,000
T01-303-01

CHAPTER 1 MAINTENANCE AND INSPECTION
1-9
3.4 Side Paper Deck
As of June 2000
No. Part name Part No. Q’ty Life Remarks
1 Pickup roller (front) FF5-1220 1 250,000
2 Pickup roller (rear) FF5-1221 1 250,000
3 Feeding roller FF5-9779 1 250,000
4 Separation roller FB2-7777-020 1 250,000
T01-304-01

CHAPTER 1 MAINTENANCE AND INSPECTION
1-10
Pickup/feeding roller
Registration roller
Transfer guide
Vertical path roller
Pre-exposure glass
Reversing roller
Duplex Feeding Roller
(right/left)
Dust-collecting roller
Disposing of toner.
Separation claw, fixing
assembly inlet guide
Clean with solvent
and lint-free paper.
Fixing roller
(upper/lower)
Use cleaning oil and
lint-free paper.
Reflecting plate
Clean with a blower brush.
Primary/Transfer/Separation/
Pre-transfer charging assembly
Dry wipe with lint-free paper;
then, clean with alcohol.
Dust-proofing glass
Dry wipe with lint-free paper.
Dry wipe with lint-free paper. Reading glass
Copyboard glass
Clean it with a blower brush;
if dirt is excessive, dry wipe
with lint-free paper.
No. 1 through No. 3 mirrors
Scanning lamp
Feeding assembly
Clean with a moist
cloth; see Note 1.
Developing assembly base
Clean with a moist
cloth; see Note 1.
Note 1: Do to leave traces of water.
4.Points to Note for Periodical Servicing
Unless otherwise instructed, clean with lint-free paper and alcohol.
• Make a thorough check of the block (front, rear) for melting by leakage,
deformation by heat, cracking, discoloration (yellowing). If a fault is
found, replace the part with a new one immediately.
• Check the block (front, rear) including its inside.
• Do not use a cloth on which metal powder is found.
• If you have used solvent, make sure that the part has dried completely
before mounting it back to the machine.
· • Do not use a moist cloth unless specifically indicated.
• Be sure to provide scheduled servicing/replacement at the specified in-
tervals.
F01-401-01

1-11
CHAPTER 1 IMAGE ADJUSTMENT BASIC PROCEDURE
5.Image Adjustment Basic Procedure
5.1 Making Pre-Checks
Using the NA3 Chart, make two copies each
in the following modes:
1. AE mode
2. Text mode
3. Text/photo mode
Generate several of the following test sheets:
1. 04 (blank)
2. 05 (halftone)
3. 06 (solid black)
Generate several each of the following
printer (PDL) images
1. Image with large background
(to check for fogging)
2. Image including solid black
(to check solid black density)
3. Image including halftone
(to check halftone density)
Check the following:
1. Height of charging wire
<Pre-Checks>
Clean the following:
1. Primary charging assembly grid wire
2. Primary charging wire
3. Pre-transfer charging wire
4. Transfer charging wire
If a fault is found on printer images,
If a fault is found on copy images,
Output Conditions
F value=5
potential control: ON
Perform 5.2 “ Making Checks on the
Printer Unit.”
Perform 5.4 “ Making Checks
on the Reader Unit.”
YES
NO
Are the test
prints normal?
Points to Note When Making Checks on the Printer Side
The machine's potential control mechanism is designed for both
copier image output and printer (PDL) image output, and its parameters
for potential control in service mode may be adjusted independently of
each other.
As such, when an image fault occurs, try to find out which side is
causing it, and generate the appropriate images (data) for adjustment of
related parameters.

1-12
CHAPTER 1 IMAGE ADJUSTMENT BASIC PROCEDURE
5.2 Making Checks on the Printer Unit (1/2)
Is there a
difference in density between
front and rear?
Is the rear lighter?
Turn the adjusting screw
found at the front of the
primary charging assembly
clockwise. (2 full turns max.)
Turn the adjusting screw
found at the rear of the
primary charging assembly
clockwise. (2 full turns max.)
Generate one print of a halftone image.
Is it foggy?
Are the readings ± 6 V
of the target value?
(*1)
Are the readings 70 ± 15 V?
<Checking the Density Slope><Checking fro Fogging>
YES
NO
YES
NO
YES
NO
NO
YES
NO
YES
YES
NO
Are there vertical
lines in the image?
Are there vertical
lines in the image?
<Checking Images>
Checking Halftone Images
YES
YES
NO
NO
Execute forced
potential control.
Generate a halftone image. Generate a blank print.
Make the selections in service mode, and turn off
and then on the main power switch:
COPIER>FUNCTION>DPC>DPC.
Check the following readings in service mode:
COPIER>DISPLAY>DPOT>VL1M (for copier image)
COPIER>DISPLAY>DPOT>VL1M-P (for printer image)
Check the following readings in service mode:
COPIER>DISPLAY>DPOT>VL2M (for copier image)
COPIER>DISPLAY>DPOT>VL2M-P (for printer image)
Check the following readings in service mode:
COPIER>DISPLAY>DPOT>VDM (for copier image)
COPIER>DISPLAY>DPOT>VDM-P (for printer image)
A
Check the following, and replace them if
necessary:
1. Laser (for output)
2. Potential control system
3. Photosensitive drum
Check the following, and replace them if
necessary.
1. Laser (for output)
2. Potential control system
3. Photosensitive drum
Check the primary charging
system and the potential control
system; if normal, replace the
photosensitive drum.
Clean the following; also check
for foreign matter:
1. Dust-proofing glass
2. Charging assemblies
1. If there still is a difference in density after giving the adjusting screw 2 turns (each turn
causing a change of about 0.7 mm), check the scanning lamp and the scanner for soiling.
2. When making a clockwise turn, be sure that the intervals between wire grid runs are not
larger than 9 mm.
When making a counterclockwise turn, be sure that the intervals between wire grid runs
are not smaller than 7.5 mm.
3. The machine will not execute potential control even when the main power switch is
turned off and then on if the temperature of the fixing assembly is 150˚C or higher.
-50 -40 -30 -20 -10 0 +10 +20 +30 +40 +50
Default
Lighter image Darker image
Adjusting the Offset of the VL Target Potential
(DE-OFFSET/DE-OFFSET-P)
Vary the value using the following as a guide:
COPIER>ADJUST>V-CONT>DE-OFST (for copier image)
COPIER>ADJUST>V-CONT>DE-OFST-P (for printer image)
Adjust the offset value of the VL target potential.
Memo
Are the readings ± 6 V
of the target value?
(*2)
REF.
*1:VD target value
COPIER >DISPLAY >DPOT >VDT (for copier image)
COPIER >DISPLAY >DPOT >VDT-P (for printer image)
*2:VL1 target value
COPIER >DISPLAY >DPOT >VD1T (for copier image)
COPIER >DISPLAY >DPOT >VD1T-P (for printer image)
Moving the wire from the photosensitive drum causes the image to be lighter, while
moving it closer causes the images to be darker.

1-13
CHAPTER 1 IMAGE ADJUSTMENT BASIC PROCEDURE
5.3 Making Checks on the Printer Unit (2/2)
<Checking the Halftone Density>
Generate a halftone image.
End.
A
To check a copier image,
See if No. 6 and No. 7 (halftone) of the Test Chart is
reproduced to the more or less the same density.
To check a printer (PDL) image,
See if the density of the halftone area represents the
original data properly.
Is the halftone
density optimum?
NO
Is the density
too low or too high (too
light or too dark)?
Are the
readings ± 6 V of the
target value?
(*1)
Adjust the offset of the VD target potential.
<Checking the Solid Black Density>
YES
YES
NO
NO
YES
NO
YES
YES
NO
Generate a solid black print.
Check the following readings in service mode:
COPIER>DISPLAY>DPOT>VL1M (for copier image)
COPIER>DISPLAY>DPOT>VL1M-P (for printer image)
Check the following readings in service mode:
COPIER>DISPLAY>DPOT>VL2M (for copier image)
COPIER>DISPLAY>DPOT>VL2M-P (for printer image)
Check the following readings in service mode:
COPIER>DISPLAY>DPOT>VDM (for copier image)
COPIER>DISPLAY>DPOT>VDM-P (for printer image)
Check the following, and replace them if
necessary:
1. Laser (for output)
2. Potential control system
3. Photosensitive drum
Check the following, and replace them if
necessary:
1. Laser (for output)
2. Potential control system
3. Photosensitive drum
Check the primary charging
system; if normal, replace the
photosensitive drum.
Adjusting the Offset Value of the VD Target Potential
(VD-OFFSET/VD-OFFSET-P)
COPIER>ADJUST>V-CONT>VD-OFST (for copier image)
COPIER>ADJUST>V-CONT>VD-VD-OFST-P (for printer image)
Default
Lighter image Darker image
Are the
readings ± 6 V of the
target value?
(*2)
Are the readings
70 ± 15 V?
-5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5
REF.
*1:VD target value
COPIER >DISPLAY >DPOT >VDT (for copier image)
COPIER >DISPLAY >DPOT >VDT-P (for printer image)
*2:VL1 target value
COPIER >DISPLAY >DPOT >VD1T (for copier image)
COPIER >DISPLAY >DPOT >VD1T-P (for printer image)

1-14
CHAPTER 1 IMAGE ADJUSTMENT BASIC PROCEDURE
5.4 Making Checks on the Reader Unit
Is there a difference
in density between
front and rear?
Are there vertical
lines in the images?
Clean the following:
1. Mirrors
2. Lens
3. Standard white plate
(mounted to back of
copyboard glass)
4. Copyboard glass
Clean the following:
1. Mirrors
2. Lens
3. Standard white plate
4. Scanning lamp
5. Reflecting plate
Make a copy of
the NA3 Chart in text mode. Is
gray scale No. 1 (solid black)
too light?
Check the life of the
scanning lamp; if it has
reached the end of its
life, replace it.
<Making Image Initial Checks> <Checking the Density Slope> <Checking the Solid Black Density>
<Checking Halftone Density>
<Checking for Fogging>
YES
YES
NO
NO
NO
YES
NO
NO
YES
YES
NO
NO
End.
YES
YES
NO
NO
Make one copy of the A3 Chart in
text/photo mode.
YES
Perform the instructions under
“ Checking the Density Slope”
for the printer unit.
Perform the instructions under
“ Checking the Solid Black Density”
for the printer unit.
YES
Go to “ Checking the Halftone Density” for the printer side.
Is there a
difference in density
between front
and rear?
Is the density of
gray scale No. 1 (solid black)
too low (light)?
Make a copy of
the NA3 Chart in text mode.
Is the white background
foggy?
Is the white
background
foggy?
Is the
density of gray scale
No.8 (halftone)
different?
If it is too dark,
If it is too light,
Perform the instructions
under “nChecking for
Fogging”g on the printer side.
YES
NO
NO
YES
Make a copy of the
NA3 Chart in AE mode. Is the
output foggy?
Is the white
background
foggy?
Decrease the value ofAE density
adjustment in service mode:
COPIER>ADJUST>AE>AE-TBL.
When
the A3 Chart
is copied in text/photo
mode, is the density of No.8 optimum
when compared with Nos.7
through 9?
B
B
Execute shading in service mode:
COPIER>FUNCTION>CCD>CCD-ADJ
Execute shading adjustment in service
mode:
COPIER>FUNCTION>CCD>CCD-ADJ.
Execute shading adjustment in service
mode:
COPIER>FUNCTION>CCD>CCD-ADJ.
Execute shading adjustment in service
mode:
COPIER>FUNCTION>CCD>CCD-ADJ.
Execute shading in service mode:
COPIER>FUNCTION>CCD>CCD-ADJ
Increase the white level target value for
shading correction in service mode:
COPIER>ADJUST>CCD>SH-TRGT
(40 max.).
Decrease the setting of the
following in service mode:
COPIER > ADJUST > DENS
>DENS-ADJ
Increase the setting of the
following in service mode:
COPIER > ADJUST > DENS
>DENS-ADJ
Executing Potential Control
Turn off and then on the power switch; then,
make a copy.
Clean the mirrors.