Canon GP405, Gp-335 Schematics

SERVICE HANDBOOK

REVISION 0

JAN. 1999

FY8-23AZ-000

IMPORTANT

THE INFORMATION CONTAINED HEREIN IS PUBLISHED BY CANON, INC., JAPAN, AND IS FOR REFERENCE USE ONLY. SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN MAY VARY SLIGHTLY FROM ACTUAL MACHINE VALUES OR THOSE FOUND IN ADVERTISING AND OTHER PRINTED MATTER.

ANY QUESTIONS REGARDING INFORMATION CONTAINED HEREIN SHOULD BE DIRECTED TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY.

Printed in Japan

Imprimé au Japon

Use of this manual should be strictly supervised to avoid disclosure of confidential information.

Prepared by

OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DEPARTMENT 1

OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DIVISION

CANON INC.

5-1, Hakusan 7-chome, Toride-shi Ibaraki, 302-8501 Japan

CHAPTER 1 MAINTENANCE AND INSPECTION

A. Scheduled Servicing Table........................1-1

1. Copier ..................................................1-1

2. Paper Deck..........................................1-2

B. Periodically Replaced Parts.......................1-3

C. Consumables and Durables ...................... 1-3

1. Copier ..................................................1-3

2. Side Paper Deck..................................1-4

D. Image Basic Adjustment Procedure..........1-5

E. Points of Scheduled Servicing................... 1-6

CHAPTER 2 STANDARDS AND ADJUSTMENTS

A. Image Adjustment...................................... 2-1

B. Exposure System ......................................2-6

C. Image Formation System ..........................2-9

D. Pick-Up/Feeding System.........................2-11

E. Fixing System ..........................................2-16

F. Electrical System .....................................2-18

CHAPTER 3 ARRANGEMENT AND FUNCTIONS OF

ELECTRICAL PARTS

A. Clutches and Solenoids.............................3-2

B. Motors........................................................3-4

C. Fan.............................................................3-6

D. Sensors......................................................3-8

E. Switches and Counters............................3-10

F. PCBs........................................................3-12

G. Side Paper Deck...................................... 3-14

1. Sensors and Switches.......................3-14

2. Motors, Solenoids, and PCBs ...........3-16

H. Variable Resisters, Light-Emitting Diodes,

and Check Pins by PCB ..........................3-18

1. Image Processor PCBs

(main controller).................................3-19

2. DC Controller PCB (DC driver)..........3-21

3. Composite Power Supply CPB .........3-23

4. Deck Driver (side paper deck)...........3-24

I. Upgrading ................................................3-25

1. Removing the DIMM.......................... 3-26

2. Mounting the DIMM ...........................3-27

3. Downloading...................................... 3-28

CHAPTER 4 SERVICE MODE

A. Outline .......................................................4-1

1. Starting Service Mode and Making

Selections ............................................ 4-1

2. Ending Service Mode .......................... 4-2

3. Backing Up the RAM ...........................4-2

4. Basic Operation ................................... 4-4

B. DISPLAY Control Display Mode................4-7

C. I/O Operation Check Mode ...................... 4-22

1. DC-CON ............................................4-23

2. IP .......................................................4-30

CHAPTER 5 SELF DIAGNOSIS

A. Copier ........................................................ 5-3

B. DADF .......................................................5-10

C. Cassette Feeding Unit-R1/S1 .................. 5-11

D. Multi Output Tray-D1 ...............................5-11

E. Finisher-C1 .............................................. 5-12

3. FEEDER ............................................ 4-31

4. SORTER (Finisher C1, Saddle

Finisher C2, Finisher E1)................... 4-34

D. ADJUST Adjustment Mode...................... 4-45

E. FUNCTION Operation Check Mode........4-53

F. OPTION Settings Mode ........................... 4-65

G. PG test Print ............................................4-73

H. COUNTER Mode ..................................... 4-78

I. FEEDER ..................................................4-81

J. SORTER (finisher, saddle stitcher) .........4-85

F. Saddle Finisher-C2 ..................................5-14

G. Finisher-E1 ..............................................5-18

H. Paper Deck-B1 ........................................5-20

I. SCSI Interface Board-D1.........................5-21

APPENDIX

A. General Timing Chart ............................... A-1

B. Signal name/abbreviation list.................... A-3

C. General Circuit Diagram ........................... A-7

D. General Circuit Diagram Paper Deck ..... A-13

E. Specifications .......................................... A-15

1. Copier ............................................... A-15

2. Paper Deck....................................... A-21

CHAPTER 1 MAINTENANCE AND INSPECTION

A. Scheduled Servicing Table

Caution:

Do not use solvents/oils not indicated here.

1. Copier

: Clean : Replace : Lubricate : Adjust : Inspect

Unit

Scanner drive assembly

Optical assembly

Developing assembly

Feeding assembly

Fixing assembly

Part

Scanner rail

No. 1 through No. 3 mirrors

Dust-proofing glass Lens Reflecting plate Original size sensor Developing assembly

roll Transfer guide

Feeding belt Feeding assembly base Fixing assembly

inlet guide Upper separation claw

Lower separation claw

Installation

every

60,000

every

120,000

every

240,000

Remarks

Use lubricant.

Note

During a visit. Clean as necessary.

Note: For cleaning intervals, use the hardware counter reading as a reference.

1-1

CHAPTER 1 MAINTENANCE AND INSPECTION

2. Paper Deck

: Clean : Replace : Lubricate : Adjust : Inspect

Unit

Pick-up assembly

Pick-up roller Pick-up/feeding

roller Separation roller Feeding roller, roll

Part

Installation

Maintenance intervals

every

250,000

every

500,000

every

750,000

every

1,000,000

Remarks

1-2

CHAPTER 1 MAINTENANCE AND INSPECTION

B. Periodically Replaced Parts

The machine does not have parts that need to be replaced on a periodical basis.

C. Consumables and Durables

1. Copier

Some parts of the machine may require replacement once or more over the period of warranty

because of wear or damage. Replace them as necessary.

As of Dec. 1998

No.

Pick-up roller

Feeding roller

Separation roller

Pick-up roller (multifeeder)

Separation pad (multifeeder)

Transfer roller

Separation static eliminator

Scanning lamp

Pre-exposure lamp

Developing cylinder

Upper fixing roller

Lower fixing roller

Upper fixing separation claw

Lower fixing separation claw

Fixing cleaning belt

Heat insulating bush

Fixing heater (main)

Fixing heater (sub)

Thermistor

Internal delivery roller

Internal delivery sensor

Parts name

Parts No. FF5-4552-020 FF5-4552-020 FF5-4634-020 FB1-8581-000 FC1-9022-030 FF5-6980-000 FF5-7246-000 FH7-3314-000 FG5-6297-000 FG6-0626-000 FB5-0289-000 FB4-2867-000 FB1-7075-000 FA2-9037-000 FA3-8908-000 FB1-6823-000 FH7-4570-000 FH7-4573-000 FG6-3881-000 FB4-2901-000 FH7-7394-000

Q'ty

2 2 2 1 1 1 1 1 1 1 1 1 5 2 1 2 1 1 1 1 1

Life (copies)

120,000 120,000 120,000 240,000 240,000 240,000 240,000 240,000 240,000 480,000 240,000 240,000 240,000 240,000 160,000 240,000 360,000 360,000 240,000 240,000 500,000

Remarks Actual copies made. Actual copies made. Actual copies made. Actual copies made. Actual copies made.

1-3

CHAPTER 1 MAINTENANCE AND INSPECTION

2. Side Paper Deck

As of Dec. 1998

No.

1 2 3

Parts name Side paper deck pick-up roller Side paper deck feeding roller Side paper deck separation roller

Parts No. FB4-2033-000 FB4-2034-000 FB2-7777-000

Q'ty

2 2 1

Life (copies)

250,000 250,000 250,000

Remarks Actual copies made. Actual copies made. Actual copies made.

1-4

D. Image Basic Adjustment Procedure

Clean the primary charging roller /transfer charging roller. ¥ To clean the primary/transfer charging roller, use ’roller clean’ under ’adjustment/clean’ in user mode.

Clean the separation static eliminator.

Is the

setting of ’density

correction’ under ’adjust/clean’

in user mode the medium

value?

YES

It the

setting of

’ADJUST’ in service

mode the value indicated on the

label attached to the

front door?

Set it to the medium value.

Enter the value

indicated on the label.

Are there vertical lines (white, black)?

YES

Clean the separation static eliminator, dust-proofing glass, mirrors (No. 1, No. 2, No. 3), standard white plate, and lens.

Are the vertical lines gone?

YES

Service Mode ADJUST>DENS>DENS-ADJ

Set DENS-ADJ to 5.

Service Mode FUNCTION>CCD>CCD-ADJ

Execute auto correction.

Open the copyboard cover or the feeder, and make 2 solid black copies.

Service Mode Density Auto Adjustment 5 items under FUNCTION>DENS.

WHITE-ME, PD-DENS, PD-ME, DZ-DENS, DZ-ME

YES

Make 2 to 3 copies in non-AE at copy density 5.

Is the white background foggy?

End.

YES

Is the fogging in the white

background gone?

Service Mode ADJUST/DENS/DENS-ADJ

Set DENS-ADJ lower than 5.

1-5

E. Points of Scheduled Servicing

Copyboard/Scanner

Item

Copyboard glass Original size sensor Scanning lamp Reflecting plate

No.1 through No.3 mirrors

Standard white plate Scanner rail

Tool/solvent

Alcohol Blower brush Lint-free paper Blower brush

Alcohol Alcohol, Lubricant

Work/remarks

Clean. Clean. Dry-wipe.

As necessary, dry-wipe with lint-free paper.

Clean

Clean, and lubricate.

Optical Assembly

Item

Lens Dust-proofing glass

Developing Assembly

Item

Developing roll

Tool/solvent

Blower brush Blower brush

Tool/solvent

Alcohol Clean.

Work/remarks

Clean. Clean.

Fixing/Delivery Assembly

Item

Separation Inlet guide

Tool/solvent

Solvent Solvent

Work/remarks

Clean. Clean.

Transfer/Feeding/Pick-Up Assembly

Item

Transfer guide Static eliminator Feeding assembly base/Feeding belt Pick-up/feeding/ separator roller

Tool/solvent

Moist cloth* Special brush Moist cloth*

Alcohol

*Take care not to leave droplets of water. Do not turn on the power before it is completely dry.

Work/remarks

Clean. Clean. Clean.

Clean.

1-6

CHAPTER 2 STANDARDS AND ADJUSTMENTS

A. Image Adjustment

Adjust the image margin, and then the

non-image width.

Adjusting the Image Leading Edge

Margin and the Non-Image Width a. Change the following settings in service

mode so that they are as indicated on the service label.

• ADJUST>ADJ-XY>ADJ-X, ADJ-Y

• ADJUST>FEED-ADJ>REGIST

b. Adjusting the Image Margin

1) Put A4 or A3 paper in the cassette, and select the cassette.

2) Select '6' in service mode (TEST>PG> TYPE), and generate a solid black copy.

3) Make adjustments so that the margin is

2.5 ±1.5 mm. <Main Scanning Direction> Use the horizontal registration mount. (See A-2.) <Sub Scanning Direction> Use service mode (ADJUST>FEEDADJ>REGIST; see A-1).

c. Adjusting the Non-Image Width

1) Select the cassette used for adjusting the image margin, and make a copy of the NA-3 Chart.

2) Make adjustments so that the leading edge and left/right non-image widths are 2.5 mm. <Main Scanning Direction> ADJUST>ADJ-XY>ADJ-Y <Sub Scanning Direction> ADJUST>ADJ-XY>ADJ-X

Caution:

Be sure that the NA-3 is placed on the copyboard glass correctly.

2-1

CHAPTER 2 STANDARDS AND ADJUSTMENTS

Image Leading Edge Margin (REGIST; registration roller

activation timing)

Standard: 2.5 ±1.5 mm For steps see the previous page. n COPIER>ADJUST>FEED-ADJ>

REGIST

2.5 ± 1.5mm

Figure 2-1

• To increase the leading edge margin, increase the setting of REGIST (thereby delaying the activation of the registration roller).

• To decrease the leading edge margin, decrease the setting of REGIST.

n After adjusting the image leading edge

margin, be sure to make adjustments under ADJUST>ADJ-XY>ADJ-X. (See the descriptions for service mode.)

Adjusting the Left/Right

Registration (front)

a. Pick-Up from the Cassette

Check to see if the margin on the image

front is 2.5 ±1.5 mm for each cassette.

( ) ( + )

2.5 1.5mm

0 2

4 6

8 10

Figure 2-2

If it is not as indicated, perform the following:

1) Slide out the cassette in question.

2) Remove the two screws [1], and detach the horizontal registration mount.

2-2

[1]

Horizontal registration mount

Figure 2-3

CHAPTER 2 STANDARDS AND ADJUSTMENTS

2.5mm ±2.0

Decrease ADJ-REFE. (A decrease of 23 causes a change of 1 mm.)

Increase ADJ-REFE. (An increase of 23 causes a change of 1 mm.)

3) Loosen the hex screw, and move the horizontal registration plate to the front/ rear to make adjustments.

(front) (rear)

Hex screw diameter

Horizontal registration plate

Hex screw

Left/Right Registration for the 2nd Side of a Double-Sided/Overlay

Copy (rear/front direction)

Check to see if the image on the 2nd side

of a double-sided/overlay copy is as indicated.

• Standard: 2.5 mm ±2.0 mm

Figure 2-6

b. Pick-Up from the Multifeeder

4mm

Figure 2-4

Caution:

When making adjustments, match the inside of the L angle of the horizontal registration plate with the appropriate graduation of the scale.

Figure 2-5

Loosen the screw, and move the tray so that it is 2.5 ±1.5 mm in Direct mode.

If it is not as indicated, make adjustments

using the following in service mode:

COPIER>ADJUST>FEED-ADJ >ADJ-REFE

2-3

CHAPTER 2 STANDARDS AND ADJUSTMENTS

4 Left/Right Registration (side paper deck)

1) Make a copy of the Test Sheet, and check to see if the left/right registration is 0 ±1.5 mm.

2) If it is not as indicated, slide out the compartment, and turn the two screws to adjust the position of the latch plate of the deck open solenoid. (At this time, refer to the scale on the latch plate.)

Latch plate

Scale

Screws

Figure 2-7 (rear left of the compartment)

2-4

CHAPTER 2 STANDARDS AND ADJUSTMENTS

5 AE Adjustment

The machine's AE (auto density adjustment) based on "priority on speed," and its method and

concept are as follows:

1. Adjusting Priority on Speed AE Mode

ADJUST>AE>AE-TBL (1 through 9; 3 at time of shipment) Adjust the density correction curve (text) for priority on speed AE mode.

• A higher setting makes text lighter.

• A lower setting makes text darker.

Copy density

White

Black

Higher setting

Black

Lower setting

Original density

White

Figure 2-8

2-5

CHAPTER 2 STANDARDS AND ADJUSTMENTS

B. Exposure System

1 Routing the Scanner Drive Cable

Route the cable from [1] through [9]; then, go to the next item, "Adjusting the Mirror Position."

Loosen the set screws to free the pulley.

Set screws

[7]

[9]

[2]

Fit the mirror positioning tool

[5]

Put the steel ball into the hole in the pulley. Wind the cable 3.5 times inwardly and

4.5 times outwardly; then, fit the pulley clip.

Steel ball

[8]

Pulley clip

[1]

[4]

2-6

38Å`39mm

[6]

[2][3]

Figure 2-9

CHAPTER 2 STANDARDS AND ADJUSTMENTS

2 Adjusting the Mirror Position

(optical length between No. 1 mirror and No. 2/No. 3 mirror)

Caution:

Use the mirror position tool FY9-3009-040. Be sure to relocate the pins before use.

[C]

[B]

[C][B]

[A]

[2]

[1]

FY9-3009-040 Before Repositioning the Pins

[3]

Figure 2-10

[3]

[2]

[1]

After repositioning the Pins

2-7

CHAPTER 2 STANDARDS AND ADJUSTMENTS

1) Loosen the screws on the metal fixings used to secure the cable.

2) Fit the mirror positioning tools (after repositioning its pins) to the No. 1 mirror mount and the No. 2 mirror mount.

Rear tab

Front tab

Figure 2-11

3) Tighten the screws on the metal fixings.

4) Detach the mirror positioning tools.

2-8

Metal fixing

Figure 2-12

CHAPTER 2 STANDARDS AND ADJUSTMENTS

3 Mounting the Scanning Lamp

Keep the following in mind when

mounting the scanning lamp:

1. Orient it so that the side (terminal) with the manufacturer's name is toward the rear.

2. Orient it so that its transparent side is toward the reflecting plate.

3. Do not touch the transparent side.

Transparent side

Reflecting plate

Figure 2-13

C. Image Formation System

1 When Replacing the Drum Unit

• Record the date and the counter reading on the label, and attach it to the front cover of the new drum unit.

date date Datum

counter compteur Zähler

• Clean the fixing separation claw (upper, lower).

notes note Notiz

Make the following adjustments when

replacing the scanning lamp:

1) Shading correction 2

FUNCTION>CCD>MAN-ADJ

2) Auto density correction

FUNCTION>DENS>WHITE-ME

PD-DENS PD-ME DZ-DENS DZ-ME

For details, see the description for

FUCNTION in service mode (VIII. of Chapter

14).

2-9

CHAPTER 2 STANDARDS AND ADJUSTMENTS

Positioning the Developing

Assembly Magnetic Seal

Mount the magnetic seal by butting it

against the opening as shown.

Check to make sure that the magnetic seal

is in firm contact with the housing.

Magnetic seal

Opening (butted)

Figure 2-14

Mounting the Developing

Assembly Blade

The blade is adjusted to a high accuracy when it is mounted to the blade mount. Avoid detaching it from its mount.

• If you must replace the blade on its own,

be sure to adjust the position of the blade

so that the gap between the blade and the

developing cylinder is 0.21 ±0.03 mm

when measured with a gap gauge (CK-

0057-000).

Blade

0.21± 0.03mm

Magnetic seal

(rear) (front)

Figure 2-15

Developing cylinder

Figure 2-16

The surface of the developing cylinder can easily be damaged. Be sure to slide the gap gauge along its both ends.

2-10

CHAPTER 2 STANDARDS AND ADJUSTMENTS

Adjusting the Positioning the Primary Charging Roller Cleaning

Solenoid

Make adjustments so that the length of the primary charging roller solenoid (SL1) indicated in the figure is 4.0 ±0.2 mm.

4.0 ± 0.2mm

Figure 2-17

D. Pick-Up/Feeding System

Adjusting the Positioning the

Multifeeder paper Guide Cam

Make adjustments so that the paper guide plate cam is as shown when the solenoid plate is in contact with the claw of the control ring.

Control ring

Screw w/ hex hole

Claw

Solenoid plate

Paper guide plate

Gear 1

Gear 2

Figure 2-18

2-11

CHAPTER 2 STANDARDS AND ADJUSTMENTS

Attaching the Timing Belt in

the Multifeeder

1) Butt the side guide plate of the multifeeder against the end (A; open condition).

2) Move the slide volume to the center (direction B), and fit the timing belt on the pulley.

Timing belt

Pulley

Rack plate

Slide volume

Pulley

Mounting the Multifeeder Pick-

Up Roller

Mount the multifeeder pick-up roller [1] so that the side with a cross [2] on its collar is toward the rear.

[2]

[1]

Figure 2-20

Figure 2-19

2-12

Mounting the Delivery Assembly Paper Deflecting

Plate Solenoid (SL2)

1) Remove the delivery assembly.

2) Place the delivery assembly upright on a flat desk.

3) Push in the steel core of the paper deflecting plate 1 solenoid (SL2) until it stops.

4) Loosen the adjusting screw, and make adjustments so that the gap between the steel core E-ring of the solenoid and the solenoid frame is about 0.2 mm.

5) Mount the delivery assembly.

CHAPTER 2 STANDARDS AND ADJUSTMENTS

Paper deflecting plate

1 solenoid (SL2)

Figure 2-21

0.2mm

2-13

CHAPTER 2 STANDARDS AND ADJUSTMENTS

Orienting the Multifeeder Pick-Up Roller

(side paper deck)

Mount the multifeeder pick-up roller by reversing the steps used to remove it with the

following in mind:

• The pick-up roller used at the front and the one used at the rear are not interchangeable.

• The collar of the pick-up roller used at the front is silver in color. When mounting the deck pick-up roller [1] for the front, orient it so that the marking [2] on the

collar (silver) is toward the front, and the marking [3] on the side of the roller is toward the rear.

[3]

(direction of rotation)

[1]

Collar (silver)

[2]

(front)

Figure 2-22 Pick-Up Roller for the Front

• The collar of the pick-up roller used at the rear is gold in color. When mounting the deck-pick-up roller [4] for the rear, orient it so that the marking [5] on the

side and the marking [6] on the collar (gold) are toward the rear.

[5]

(direction of rotation)

[6]

2-14

[4]

Collar (gold)

(rear)

Figure 2-23 Pick-Up Roller for the Rear

CHAPTER 2 STANDARDS AND ADJUSTMENTS

Orienting the Side Paper Deck

Feeding Roller

Mount the feeding roller [1] to the side paper deck pick-up assembly so that the belt pulley [2] is toward the front.

When attaching the pick-up/feeding roller rubber to the pick-up/feeding roller shaft, be sure that the marking [3] is toward the rear.

[5]

[3]

[4]

[2]

[1]

(front)

Positioning the Side Paper Deck Pick-Up Roller Releasing

Solenoid

Take note of the position of the two fixing screws of the deck pick-up roller releasing solenoid with reference to the scale on the support plate before removing the solenoid. Or, mark the position of the solenoid on the support plate with a scriber.

When mounting the solenoid on its own, be sure to secure it back to its initial position.

[2]

Figure 2-24

[1]

Figure 2-25

2-15

CHAPTER 2 STANDARDS AND ADJUSTMENTS

E. Fixing System

When Mounting the Fixing

Heater

1) Do not touch the heater surface.

2) Orient it so that the side with the longer heater wire is toward the front.

3) Mount the main heater (700 W) to the right and the sub heater (600 W) to the left when viewing the fixing assembly from the front.

4) Connect the right faston of the heater to the main heater and the upper faston to the sub heater when viewing it from the rear. (The fastons are found at the rear.)

Sub heater

(Delivery side)

Main heater

(pick-up side)

Adjusting the Lower Fixing

Roller Pressure (nip)

If you have replaced the upper fixing roller or the lower fixing roller, or if fixing faults occur, make the following adjustments:

If you are taking measurements while the fixing roller is cold, leave the machine alone for 15 min after it ends its wait period and make 20 copies before taking measurements: <Taking Measurements>

1) Make an A4 solid black copy, and make a

copy of it. Set the output in the

multifeeder.

2) Select NIP-CHK in service mode

(FUNCTION>FIXING), and press the

OK key.

3) The paper will be picked up and is stopped

between the fixing rollers temporarily;

then, it will automatically be discharged in

about 20 sec.

4) Measure the width of the area where toner

is shiny (Figure 2-27).

Upper fixing roller

Figure 2-26

Positioning the Fixing

Assembly Paper Guide

Caution:

If you removed the inlet guide plate, you would need to adjust the position of the inlet guide. To avoid the work, do not loosen the mounting screw (paintlocked) on the inlet guide mount; otherwise, be sure to set it to its initial position by referring to the scale on the fixing assembly.

(Feeding direction)

Center of the copy

Figure 2-27

Caution:

a and c are points 10 mm from both edges of the copy paper.

Point

a-c

* Measured when the upper/lower roller is

adequately heated.

Measurements*

5.5 ±0.3 mm

0.5 mm or less

2-16

Table 2-1

5) If not as indicated, turn the pressure adjusting screw 1 found at the rear and the front of the fixing assembly to make adjustments.

[1]

Figure 2-28

When Replacing the Lower

Fixing Roller

CHAPTER 2 STANDARDS AND ADJUSTMENTS

When replacing the lower fixing roller or

the bearing of the lower roller shaft, be sure to apply heat-resisting grease (MO-138S) to the shaft to prevent adhesion of the shaft and the bearing.

2-17

CHAPTER 2 STANDARDS AND ADJUSTMENTS

F. Electrical System

1 Replacing the Major Part

Parts

Image processor PCB

[A]

Composite power supply PCB

Laser scanner unit

Laser unit CCD unit Scanning lamp DC controller

PCB Standard white

plate Control panel LCD

Multifeeder size detecting volume

Fixing assembly Fixing cleaning

belt

Description/Service mode

n Before Replacement

Generate stored data of ADJUST, OPTION, and COUNTER.

n After Replacement

1) Execute RAM clear (image processor PCB).

2) Enter data under AJDUST and OPTION.

3) Execute shading auto correction 2.

4) Execute density correction.

4-1) Execute standard white plate

density read. 4-2) Execute density auto correction. 4-3) Execute DZ density auto

correction. n After Replacement

1) Enter the values indicated on the

label attached to the composite power supply PCB in service mode.

2) Execute shading auto correction 1.

3) Execute auto density correction.

1) Execute shading auto correction 1.

2) Execute auto density correction.

1) Execute shading auto correction 2.

2) Execute auto density correction.

Adjust the coordinate position of the analog touch panel.

Store the paper width basic value for the multifeeder.

Nip (as indicated?) Execute cleaning belt clear.

FUNCTION>MISC-P>P-PRINT

FUNCTION>CLEAR>IP YAKUNUKE FUNCTION>CCD>MAN-ADJ

FUNCTION>DENS>WHITE-ME FUNCTION>DENS>PD-DENS

FUNCTION>DENS>DZ-DENS FUNCTION>DENS>DZ-ME

FUNCTION>CCD>CCD-ADJ Same as [A] above.

FUNCTION>CCD>CCD>ADJ Same as [A] above.

FUNCTION>CCD>MAN-ADJ Same as {A] above.

FUNCTION>PANEL>TOUCHKEY

FUNCTION>CST>MF-A4R, A6R, A4

FUNCTION>FIXING>NIP-CHK COUNTER>MISC>FIX-WEB

2-18

CHAPTER 2 STANDARDS AND ADJUSTMENTS

2 Shading Auto Correction

• Shading auto correction may be either of two types (CCD-ADJ, MAN-AJD). Select the appropriate mode.

• In shading auto correction, various data measurements are taken and stored in the RAM on the image processor PCB for use as the target value for shading correction performed before scanning operation. The following are service mode item related to shading auto correction; see the appropriate service mode item for details:

ADJUST

FUNCTION

ADJ-XY CCD

CCD

ADJ-S PPR W-PLT CCD-ADJ MAN-ADJ

standard white plate read position standard white paper density data standard white plate density data shading auto correction 1 (for normal image adjustment) shading auto correction 2 (for PCB, lamp replacement)

n Using CCD-ADJ

• Start service mode.

1) Press the asterisk key.

2) Press '2' and '8' on the keypad at the same time.

3) Press the asterisk key.

4) On the screen, select <COPIER>, <FUNCTION>, and <CCD> in sequence.

5) Select <CCD-ADJ>, and press the OK key. (You need not place standard white paper.)

n Using MAN-ADJ

1) Remove the rear cover, and check the position of VR200 on the DC controller PCB.

2) Place the standard white paper on the copyboard glass.

3) Start service mode. (See steps 1) through 4) under "Using CCD-ADJ.")

4) Select <MAN-ADJ>, and press the OK key.

5) When VO is indicated and the beep is sounded, press the OK key. If the beep is not heard, turn VR200 on the DC controller PCB; when the beep is sounded, press the OK key. Adjustments are needed if LED201 turns on.

6) Check to see if END is indicated.

DC controller PCB

Figure 2-29

LED201

VR200

2-19

CHAPTER 2 STANDARDS AND ADJUSTMENTS

3 Copy Density Auto Correction

n Execute copy density auto correction for the following:

The copy image is not proper (image fault). The laser unit has been replaced. The image processor has been replaced. The composite power supply PCB has been replaced.

n When executing copy density auto correction, be sure to execute the following three types (five

items) as a set. Be sure to execute shading correction before executing density correction.

• Standard white paper density read FUNCTION>DENS>WHITE-ME

• PD density auto correction FUNCTION>DENS>PD-DENS (text, text/photo mode) FUNCTION>DENS>PD-ME

• DZ density auto correction FUNCTION>DENS>DZ-DENS (photo mode) FUNCTION>DENS>DZ-ME

n The following blocks are subjected to correction processing:

Laser characteristic correction

Developing bias correction n Executing the Mode a. Executing Shading Correction

1) Start service mode.

2) Select COPIER>FUNCTION>CCD in sequence; then, select <CCD-ADJ>.

3) Press the OK key. (You need not place standard white paper.)

4) End service mode; then, make two solid black copies while holding the feeder or the copyboard

glass open. Check to make sure that white lines did not occur.

2-20

+ 170 hidden pages

Canon GP405, Gp-335 Schematics

CONTENTS

CHAPTER 1 MAINTENANCE AND INSPECTION

A. Scheduled Servicing Table

B. Periodically Replaced Parts

C. Consumables and Durables

D. Image Basic Adjustment Procedure

E. Points of Scheduled Servicing

A. Image Adjustment

B. Exposure System

C. Image Formation System

D. Pick-Up/Feeding System

E. Fixing System

F. Electrical System