Canon NP6621 Service Handbook

SERVICE HANDBOOK

REVISION 0

FEB. 1998

FY8-23AT-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, 302-0023 Japan

Guide To Tables

In this Handbook, work procedures are given in the form of tables instead of flow charts used generally.

Familiarize yourself by studying the example below.

EX. AC power is absent.

Cause

Power plug

Step

Checks

Is the power plug connected to

Yes/No

Connect the power plug.

Remedy

the power outlet?

Covers

Are the front door and delivery

Close the door or the cover.

cover closed properly?

Power source

Is the rated voltage present at the power outlet?

Is the rated voltage present

YES

The problem is not of the copier. Advise the customer as such.

Go to step 6. between J1-1 and -2 (near cord plate)?

■ To find out the cause (problem part) of a single problem, refer to the item under “Cause.” For “AC power is absent,” the cause may be the power plug, covers, power source, or others.

■ To find out the checks to make or remedies to provide for a single problem, refer to the “Checks” and “Remedy”; make checks, answer to the questions YES or NO, and provide remedies accordingly. If the answer is otherwise, proceed to the next step.

<Step>

Is the power plug

connected to the

power outlet?

YES

▼

Are the front door

and delivery cover

closed properly?

YES

▼

Is the rated voltage

present at the power

outlet?

YES

▼

Connect the power

▼

plug.

Close the door or

▼

the cover.

The problem is not of the copier. Advise

▼

the customer as such.

■ Checks on the voltage using a meter call for special note; the description “Check the voltage between J109-1 (+) and J109-2 (–) on the DC controller PCB” means that the positive probe of the meter should be placed on J109-1 (+) and the negative probe, on J109-2 (–).

CHAPTER 1 MAINTENANCE AND INSPECTION

I. SERVICING CHART .................................1-1

II. PERIODICALLY REPLACED PARTS....... 1-2

A. Periodically Replaced Parts ................1-2

III. DURABLES ...............................................1-3

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

B. Cassette Feeding Module-B2/

Cassette Feeding Module-A2/

Cassette Feeding Unit-K1 ...................1-4

C. Paper Deck Pedestal-K1.....................1-4

IV. MAINTENANCE AND INSPECTION ........1-5

A. Image Adjustment Procedure..............1-5

B. Points to Note for Servicing Work .......1-6

CHAPTER 2 STANDARDS AND ADJUSTMENTS

A. Mechanical................................................. 2-1

1. Adjusting the Image Leading

Edge Margin ([3], No.305;

registration ON timing).........................2-1

2. Adjusting the Leading Edge

Non-Image Width ([3], No.306;

blank shutter ON timing)...................... 2-1

3. Adjusting the Image Trailing

Edge Non-Image Width ([3], No.309;

blanking shutter timing) .......................2-2

4. Adjusting the Left/Right

Registration ......................................... 2-2

5. Adjusting the Left/Right Margin

(No.311 left/right margin

adjustment)..........................................2-3

6. Routing the Scanner Drive Cable........2-4

7. Adjusting the Mirror Position

(optical length between No.1mirror

and No.2/3 mirror) ...............................2-5

8. Adjusting the Scanner Cable

Tension................................................2-5

9. Orienting the Pick-Up Roller................2-5

10. Orienting the Multifeeder

Pick-Up Roller......................................2-6

11. Positioning the Multifeeder Assembly

Paper Guide Plate Cam ......................2-6

12. Positioning the Blanking

Shutter Solenoid .................................. 2-7

13. Positioning the Change Solenoid ........2-7

14. Routing the Blanking Shutter Cable ....2-8

15. Adjusting the Lower Fixing Roller

Nip ....................................................... 2-8

16. Points to Note After Replacing

the Upper Fixing Unit...........................2-9

17. Mounting the Oil Application Solenoid ..2-9

18. Routing the Drive Belt .......................2-10

19. Positioning the Primary Charging

Roller Cleaning Solenoid...................2-11

20. After Replacing the Drum Unit...........2-12

21. Installing the Drum Heater.................2-12

22. Assembling the Mirror Positioning

Tool....................................................2-13

23. Positioning the Paper Deflecting

Plate Solenoid (SL8) ......................... 2-13

24. Setting the Deck Size ........................ 2-13

25. Adjusting the Deck Registration ........2-14

B. Electrical .................................................. 2-15

1. Adjustment after Replacing PCBs.....2-15

2. Adjusting the Scanning Lamp

Intensity ............................................. 2-15

3. AE Adjustment...................................2-15

4. Multifeeder Paper Width Sensor

Adjustment.........................................2-19

5. Setting the Paper Size for the

Universal Cassette ............................2-20

6. Initializing the Back-Up RAM.............2-21

7. Checking the Photointerrupters.........2-21

iii

CHAPTER 3 IMAGE FAULTS

A. Initial Checks .............................................3-1

B. Samples of Image Faults...........................3-4

Troubleshooting Image Faults ......................

1. The copy is too light (half-tone

areas only)...........................................3-5

2. The copy is too light (including

solid black)........................................... 3-6

3. The copy is too light (overall,

extremely)............................................3-6

4. The copy has uneven density

(darker at front)....................................3-7

5. The copy has uneven density

(lighter at front). ................................... 3-7

6. The copy is foggy (overall). ................. 3-8

7. The copy has vertical fogging.............. 3-9

8. The copy has black lines

(vertical, fuzzy, thick). .......................... 3-9

9. The copy has black lines

(vertical, fine). ....................................3-10

3-5

10. The copy has white spots (vertical). ..3-11

11. The copy has white lines (vertical). ...3-11

12. The copy has white spots

(horizontal)......................................... 3-12

13. The back of the copy is soiled. .......... 3-13

14. The copy has a fixing fault.................3-14

15. The leading edge of the copy

is displaced........................................3-15

16. The leading edge of the copy

is displaced........................................3-15

17. The leading edge of the copy

is displaced........................................3-15

18. The copy has blurred images. ...........3-16

19. The copy has horizontal fogging. ......3-16

20. The copy has poor sharpness. ..........3-17

21. The copy is blank...............................3-18

22. The copy is solid black. ..................... 3-18

CHAPTER 4 TROUBLESHOOTING MALFUNCTIONS

1. E000 .......................................................... 4-1

2. E001 .......................................................... 4-2

3. E002, E003 ................................................ 4-2

4. E004 .......................................................... 4-3

5. E010 .......................................................... 4-4

6. E064 .......................................................... 4-5

7. E202 (The keys on the control panel are

locked.) ...................................................... 4-5

8. E210 .......................................................... 4-6

9. E220 .......................................................... 4-6

10. E240 ..........................................................4-6

11. E260 ..........................................................4-7

12. E261 ..........................................................4-7

13. E710, E711, E712, E717 ........................... 4-8

14. E802 ..........................................................4-8

15. AC power is absent. ..................................4-9

16. DC power is absent. ................................ 4-10

17. The blanking shutter fails to operate. ......4-10

18. The photosensitive drum fails to rorate. .. 4-11

19. Pick-up operation fails (from cassette). ...4-11

20. Pick-up operation fails (multifeeder). .......4-12

21. The scanner fails to move forward/

in reverse. ................................................4-12

22. The registration roller fails to operate. ..... 4-13

23. The scanning lamp fails to turn ON. ........4-13

24. The lens fails to move. ............................. 4-14

25. The fixing heater fails to operate. ............4-14

26. The pre-exposure lamp fails to turn ON. . 4-15

27. The ADD PAPER message fails to turn

OFF.......................................................... 4-15

28. The JAM message fails to turn OFF........4-15

CHAPTER 5 TROUBLESHOOTING FEEDING

FAULTS

A. Copy Paper Jams ......................................5-1

1. Pick-Up Assembly ............................... 5-2

2. Separation/Feeding Assembly ............5-3

3. Fixing/Delivery Assembly .................... 5-3

4. Duplexing Unit (during stacking

operation) ............................................ 5-4

5. Duplexing Unit (during re-pick

up operation) ....................................... 5-4

B. Feeding Faults............................................5-5

1. Double Feeding ...................................5-5

2. Wrinkles...............................................5-5

C. Paper Deck................................................5-6

1. Pick-up fails (from deck). ..................... 5-6

2. Paper jams when pick-up is from the

paper deck...........................................5-7

3. Double feeding (paper deck). ..............5-8

4. Wrinkling (paper deck).........................5-8

5. The ‘ADD PAPER’ message fails to

turn off (paper deck). ...........................5-9

6. The lifter fails to rise (paper deck). ....5-10

CHAPTER 6 ARRANGEMENT AND FUNCTIONS OF

THE ELECTRICAL PARTS

A. Sensors...................................................... 6-2

B. Clutches, Solenoids,

and Switches .............................................6-4

C. Motors, Heaters, and Lamps ..................... 6-6

D. PCBs..........................................................6-8

CHAPTER 7 SERVICE MODE

A. Outline ....................................................... 7-1

B. Using Service Mode .................................. 7-1

C. Control Display Mode (‘1’) .........................7-3

D. I/O Mode (‘2’).............................................7-6

CHAPTER 8 SELF DIAGNOSIS

A. Copier Self Diagnosis ................................8-1

B. Self Diagnosis on the Cassette Feeding

Unit ............................................................ 8-4

E. Cassette Feeding Module-A2 .................. 6-10

F. Cassette Feeding Unit-K1 .......................6-12

G. Paper Deck Pedestal-K1 .........................6-14

H. Variable Resistors (VR) and

Check Pins by PCB. ................................ 6-16

E. Adjustment Mode (‘3’).............................. 7-10

F. Operation/Inspection Mode (‘4’) ..............7-13

G. Machine Settings Mode (‘5’) ....................7-14

H. Counter Mode (‘6’)................................... 7-16

C. RDF/ADF Self Diagnosis...........................8-5

D. Sorter Self Diagnosis................................. 8-6

APPENDIX

A. GENERAL TIMING CHART ..................... A-1

B. SIGNALS AND ABBREVIATIONS ........... A-2

C. GENERAL CIRCUIT DIAGRAM............... A-5

D. SPECIFICATIONS .................................... A-7

I. Copier.................................................. A-7

II. Cassette Feeding Module-B2/

Cassette Feeding Module-A2/

Cassette Feeding Unit-K1 ................ A-11

III. Paper Deck Pedestal-K1 .................. A-11

E. SPECIAL TOOLS ................................... A-12

F. SOLVENTS/OILS ................................... A-13

MAINTENANCE AND INSPECTION

CHAPTER 1 MAINTENANCE AND INSPECTION

I. SERVICING CHART

Caution:

Do not use solvents or oils other than those specified.

: clean : replace ✩ : lubricate : adjust : inspect or clean

Unit

External Pick-up

assembly Scanner drive

assembly

Feeding assembly

Parts

Copyboard glass Pick-up roller Scanner rail Transfer guide assembly Feeding belt Feeding assembly mount

every

20,000

every

60,000

✩

every

100,000

every

year

Remarks

Use alcohol.

Use alcohol solution; then, apply lubricant.

Use a moist cloth.

Optical assembly

Drum kit

Charging assembly

Developing assembly

Fixing assembly

Reflecting plate for original exposure Side reflecting plate for

original exposure No. 1 through No. 6 mirrors

Lens Dust-proofing glass Clearner base Drum support shaft Charging roller Charging roller cleaner Static eliminator Developing spacer Upper fixing roller Lower fixing roller Separation claw (lower, upper) Fixing inlet guide

Use a blower brush; if the soiling is excessive, use alcohol.

Actual use of the drum kit.

Use a cotton wad.

Use cleaning oil.

Use solvent.

Delivery assembly

Duplexing

Delivery guide/ tray Fixing feeding spacer Delivery spacer Set-back roller Re-pick-up roller

Use alcohol.

1–1

MAINTENANCE AND INSPECTION

II. PERIODICALLY REPLACED PARTS

Some parts of the copier must be replaced on a periodical basis to ensure a specific level of performance; replace them as indicated regardless of the presence of visible damage. Plan the replacement to coincide with a scheduled visit.

A. Periodically Replaced Parts

No.

Static eliminator

Note:

The above values are estimates only and subject to change based on the future data.

Parts name

Parts No.

FG5-2912-020

Q’ty

Life (copies)

100,000

as of FEB. 1998

Remarks

1–2

MAINTENANCE AND INSPECTION

III. DURABLES

The parts shown in the table may require replacement because of deterioration or damage over the period

of warranty; replace them when they fail using the table as a guide.

A. Copier

No.

Pick-up roller

Pick-up separation pad

Multifeeder pick-up roller

Multifeeder separation pad

Halogen lamp

Fixing cleaning roller

Oil-applying roller

Transfer roller

Upper fixing unit

Lower fixing roller

Parts name

Parts No.

FB3-8771-00P

FG5-6792-020

FB1-8581-000

FB2-2167-000

FH7-3271-000

FB3-4494-00P

FA0-0353-00P

FB2-2223-000

FG5-2928-140

FB2-2316-000

Q’ty

as of FEB. 1998

Life (copies)

100,000

60,000

100,000

200,000

Remarks

See Note 1.

14-1

14-2

14-4

Note:

1. The life represents the number of copies actually made using the part.

2. The above values are estimates only and subject to change based on future data.

Upper fixing separation claw

Lower fixing separation claw

Pre-exposure lamp

Developing assembly

Developing cylinder

Side seal

Developing blade unit

Scanner cooling fan filter

FB1-0301-000

FB1-7275-000

FG5-2891-000

FG5-3275-04P

FB2-3834-000

FB2-3825-00P

FG5-7012-00P

FC2-8902-00P

200,000

100,000

Replace with item 12 or 12-1 through 12-4.

1–3

MAINTENANCE AND INSPECTION

B. Cassette Feeding Module-B2/Cassette Feeding Module-A2/

Cassette Feeding Unit-K1

as of FEB. 1998

No.

Pick-up roller

Pick-up separation pad

Note:

The above values are estimates only and subject to change based on future data.

Parts name

Parts No.

FB2-2251-000

FG5-3614-000

Q’ty

1 through 3

Life (copies)

100,000

C. Paper Deck Pedestal-K1

No.

Parts name

Pick-up roller

Feeding roller

Parts No.

FF5-1220-000

FF5-1221-000

FB1-7061-000

Q’ty

Life (copies)

100,000

Remarks

Actual usage

as of FEB. 1998

Remarks

Rear

Front

Separation roller

Note:

The above values are estimates only and subject to change based on future data.

FB1-7060-020

100,000

1–4

MAINTENANCE AND INSPECTION

IV. MAINTENANCE AND INSPECTION

A. Image Adjustment Procedure

Pre-Checks

Clean the static eliminator.

Is the density correction volume (VR850) on the service switch PCB centered on the black dot?

▼

Adjust pointer to black dot on panel.

Make sure that all input values of service mode [3] are as indicated on the label attached to the front door; if different, correct them.

▼

YES

Optimum Density Adjustment

Is the density of gray scale

▼

No. 8 optimum?

Is the density of gray scale too high (dark)?

▼

Turn the copy density correction volume (VR850) clockwise so that No. 8 darkens. (Note 2).

Make one copy.

YES

End the

▼

adjustment.

▼

YES

▼

Turn the copy density correction volume (VR850) counterclockwise so that No. 8 lightens. (Note 2)

▼

Make two to three copies in non-AE and at copy density 5. (NA-3)

▼

Check the following:

1. density of gray scale No. 8

2. presence/absence of fogging in white background

▼

Note 1:

For NA-3 (Test Charts), make sure that No. 8 on the copy is of the same density as No. 4 through No. 7 of the charts.

Note 2:

A shift is made in the control of the developing bias (DC component).

1–5

B. Points to Note for Servicing Work

MAINTENANCE AND INSPECTION

Copyboard, Scanner

Item Tool/Solvent Work/Remarks Copyboard glass Scanning lamp Reflecting plate No. 1 though

6 mirrors

Alcohol Lint-free paper

Blower brush

Cleaning Dry wiping If excessive, dry wiping

with lint-free paper

Optical path

Item Lens Dust-proofing

glass

Tool/Solvent Work/Remarks Blower brush Blower brush

Cleaning Cleaning

Fixing/Delivery assembly

Item

Separation claws Upper fixing

roller,lower fixing roller

Paper guide plate

Tool/Solvent MEK Cleaning oil

(TKN-0464 )

MEK

Work/Remarks Cleaning Cleaning

Cleaning

Duplexing unit

Item

Re-pick up roller Set-back roller

Feeding assembly, Static eliminator

Item Transfer guide Static eliminator Feeding belt,

Feeding assembly mount, Transfer charging assembly, Rail

Note: Make sure no droplets of water remain; if any, do not turn on the power.

Tool/Solvent Work/Remarks Alcohol Alcohol

Tool/Solvent Work/Remarks Moist cloth (Note) Special brush Moist cloth (Note)

Cleaning Cleaning

Cleaning

1–6

STANDARDS AND ADJUSTMENTS

CHAPTER 2 STANDARDS AND ADJUSTMENTS

A. Mechanical

1 Adjusting the Image Leading

Edge Margin ([3], No. 305; registration ON timing)

Select service mode ([3] No. 305; leading edge margin adjustment). Make adjustments so that the image position is as indicated in Figure 2-200 when the Test Chart is copied in DIRECT.

2.5±1.5mm

Figure 2-200

Making Adjustments

1) Choose service mode [3], and select No. 305

using the numeric keypad.

• The copy count display flashes ‘No. 305’.

2) Press the Start key.

• The display flashes the present value.

• If the value is negative, ‘%’ is flashed. To enter a negative value, press the % key, and then enter the value using the numeric keypad.

4) Press the AE key.

• The value is stored and the display remains ON.

• Copying starts when the start key is pressed.

5) To enter a value once again, repeat steps 1) and 4).

6) Press the Clear key to return to item selection. The following is the relationship between the settings and the image positions:

• For each ‘1’, the image position changes by

about 0.27 mm.

• For a ‘+’, the image position advances.

2 Adjusting the Leading Edge Non-

Image Width ([3], No. 306; blank shutter ON timing)

Select service mode ([3] No. 306; leading edge non-image width), and make adjustments so that the leading edge non-image width is as indicated in Figure 2-201 when the Test Sheet is copied in DIRECT.

The machine adjusts the leading edge nonimage width taking advantage of the timing at which the blanking shutter closes.

You must make this adjustment whenever you have replaced the blanking shutter solenoid or the blank exposure assembly.

Leading Edge Non-Image Width

2.5±1.5mm

Figure 2-201

Reference:

In enlargement/reduction mode, 6 mm or less.

Making Adjustments

1) Select service mode ([3] No. 306).

• The copy count display flashes ‘No. 306’.

2) Press the Start key.

3) Change the setting using the numeric keypad.

• The display flashes the present value.

• If the value is negative, ‘%’ is flashed. To enter a negative value, press the % key, and then enter the value using the numeric keypad.

4) Press the AE key.

• The value is stored and the display remains ON.

• Copying starts when the start key is pressed.

5) To enter a value once again, repeat steps 1) and

2).

2–1

STANDARDS AND ADJUSTMENTS

6) Press the Clear key to return to item selection. The following is the relationship between the settings and the image positions:

• For each ‘1’, the image position changes by

about 0.27 mm.

• For a ‘+’, the leading edge non-image width

increases.

3 Adjusting the Image Trailing

Edge Non-Image Width ([3] No. 309; blanking shutter timing)

Trailing Edge Non-Image Width

2.5±

1.5mm

• For each ‘1’, the image position changes by about 0.27 mm.

• For a ‘+’, the trailing edge non-image width decreases.

4 Adjusting the Left/Right Regis-

tration

Make adjustments so that the image position is as indicated in Figure 2-204 when the Test Sheet is copied in DIRECT.

a. Pick-Up from the Cassette

Turn the screw q shown in Figure 2-203 to adjust the position of the cassette hook.

standard: 0 ±1.5 mm

CW turn: moves the paper in the direction of

(–) shown in Figure 2-204.

CCW turn: moves the paper in the direction of

(+) indicated in Figure 2-204.

Figure 2-202

Select service mode ([3] No. 309; leading edge non-image width adjustment), and make adjustments so that the image trailing edge non-image width is as indicated in Figure 2-202 when the Test Sheet is copied in DIRECT.

The machine adjusts the image trailing edge non-image width by taking advantage of the timing at which the blanking shutter opens.

Making Adjustments

1) Select service mode ([3] No. 309).

• The copy count display flashes ‘No. 309’.

2) Press the Start key.

3) Change the setting using the numeric keypad.

• The display flashes the value.

• If the value is negative, ‘%’ is flashed. To enter a negative value, press the % key, and then enter the value using the numeric keypad.

4) Press the AE key.

• The value is stored and the display remains ON.

• Copying starts when the start key is pressed.

5) To enter a value once again, repeat steps 1) and 2).

6) Press the Clear key to return to item selection. The following is the relationship between the settings and the image positions:

(-)

Figure 2-203

(+)

0±1.5mm

0 2

4 6 8

Figure 2-204

2–2

b. Pick-Up from the Multifeeder

Shutter

Adjust the distance between the two shutters in the blanking assembly.

Shutter

The entire shutters are shifted.

Loosen the screw q, and move the position of

the tray so that the measurement is 0 ±1.5 mm.

Figure 2-205

c. Duplexing Pick-up

Start service mode (No. 329), and make adjustments so that the measurement (Figure 2-204) is 0 ±1.5 mm.

Unit: 0.27 mm

STANDARDS AND ADJUSTMENTS

Figure 2-206

b. Adjusting the Position of the Left/Right

Margin

Turn the blanking adjusting screw on the machine front side plate shown in Figure 2-207 so that the dimension is as specified:

CW: moves the margin to the front.

CCW: moves the margin to the rear.

full turn: moves the margin by about 1 mm.

5 Adjusting the Left/Right Margin

(No. 311 left/right margin adjustment)

Select service mode (No. 311 left/right margin adjustment), and make adjustments so that the left/ right margin is 2.5 ±1.5 mm when the Test Sheet is copied in DIRECT. You must first adjust the “left/right registration” before making this adjustment.

Making Adjustments

a. Margin (adjusting the width)

1) Select service mode ([3] No. 311).

2) Press the Start key.

3) Enter the new setting using the numeric key-

pad.

• If the value is negative, ‘%’ is flashed. To enter a negative value, press the % key, and then enter the value using the numeric keypad. The following describes the relationship between the settings and the margin:

• For each ‘1’ in the setting, the margin changes to the side by about 0.37 mm.

• The settings may be between 0 and 15 mm.

• ‘+’ increases the margin.

• ‘-’ decreases the margin.

Figure 2-207

Figure 2-208

Note:

For both a. and b., turn ON and OFF the power switch after making the adjustments or try a different reproduction ratio to move the home position of the blank exposure assembly.

2–3

STANDARDS AND ADJUSTMENTS

6 Routing the Scanner Drive Cable

Route the cable as indicated by the numbers q through !1, and perform “Adjusting the Cable tension”

and “Adjusting the Mirror Position” as described.

Screw

Loosen the screw,and shift it down.

Re-tighten the screw.

Attach the mirror positioning tool.

Set screws

Loosen the set screws to enable free rotation.

Put the steel ball into the hole in the pulley; wind the cable nine times toward the inside, and four times toward the outside; then, snap on the pulley clip.

!0 

Pulley clip

Steel ball

34±1mm

Figure 2-209

Caution:

Pay attention to the direction of the wire spring when installing the cable spring. (Follow the illustrations given below.) Installing the spring in the wrong direction can cause the hook tip of the spring to interfere with the cable.

Cable

Hook

Cable spring Cable spring

Hook

Cable

2–4

(front) (rear)

Figure 2-210

STANDARDS AND ADJUSTMENTS

7 Adjusting the Mirror Position (op-

tical length between No. 1 mirror and No. 2/3 mirror)

1) Keep the mirror positioning tool at hand.

2) Move the No. 1 mirror mount in the forward direction, and match the angular hole in the front side plate and the cable fixing screw q.

(front) (rear)

Figure 2-211

3) Loosen the set screw on the pulley.

4) Attach the mirror positioning tool w to the No. 1 mirror mount and the No. 2 mirror mount (both front and rear).

5) Install the metal fixing of the scanner cable to the No. 1 mirror mount using two screws e (both front and rear).

(front) (rear)

Figure 2-213

6) Tighten the set screw of the pulley.

7) Remove the tool (FY9-3009).

8 Adjusting the Scanner Cable

Tension

Pull the tension spring so that both ends of the cable spring q is 34 ±1 mm, and tighten the screw w.

Mirror positioning tool (front)

(front) (rear)

Figure 2-212

Mirror positioning tool (rear)

(front)

34±1mm

Figure 2-214

9 Orienting the Pick-Up Roller

When installing the pick-up roller q, make sure that the face indicated in Figure 2-215 is toward the rear.

Figure 2-215

2–5

STANDARDS AND ADJUSTMENTS

130.5±0.5mm

Paper guide plate cam

Hole

10 Orienting the Multifeeder Pick-

Up Roller

When installing the multifeeder pick-up roller q, make sure that the side with a cross w on its collar is toward the rear.

(front)

Figure 2-216

11 Positioning the Multifeeder As-

sembly Paper Guide Plate Cam

Temporarily fix the screw with a hex nut of the spring clutch assembly in place, and rotate the control ring. At this time, i.e., while the claw of the control ring is engaged with the solenoid plate, make adjustments so that the hole (or black dot) in the cam and the hole in the multifeeder drive unit match; then, tighten the part in place.

Caution:

If the adjusting hole is not furnished with a black dot for reference, make adjustments as instructed while making sure that the paper guide plate cam of the multifeeder assembly is located as shown.

Figure 2-218

Holes (or hole and black dot) matched

Horizontal line

Gear

Control ring

Screw w/hex nut

Gear

Paper guide plate cam

Claw

Solenoid plate

Figure 2-217

2–6

STANDARDS AND ADJUSTMENTS

12 Positioning the Blanking Shutter Solenoid

Adjust the position of the solenoid so that bottom A is 9.5 ±0.5 mm for both sides of the shutter when the

solenoid is moved to the ON direction. Avoid forcing the shutter down when taking measurements.

After adjustment, make sure that the solenoid moves smoothly.

Figure 2-219

Figure 2-220

13 Positioning the Change Solenoid

Loosen the two screws t, and make adjustments so that the gear r moves until it stops in the direction of b along the arm e when the steel core q of the solenoid is fully pushed in the direction of B, i.e., when the E-ring w comes into contact with the solenoid.

Figure 2-221

2–7

STANDARDS AND ADJUSTMENTS

14 Routing the Blanking Shutter Cable

Attach the spring to the outside of the sides shutter.

Slide shutter (rear)

Wind 3.5 times.

Slide shutter (front)

Figure 2-222

15 Adjusting the Lower Fixing Roller Nip

If fixing faults occur, make the following adjustments:

The nip is correct if it is as indicated in Figure 2-223; otherwise, turn the bolt to adjust.

paper

Feeding direction

Center of copy

paper

b : 4.5±0.5mm a-c : 0.5mm or less

Figure 2-223

Note:

a and c represent points 10 mm from either edge of the paper.

2–8

STANDARDS AND ADJUSTMENTS

Oil application Solenoid

Screw

Lever

Contact

Support

a. Measuring the Nip

Measure the nip when the machine is turned on

for the first time in the morning.

1) Open the copyboard cover, and make an A4 (SM0-1) solid black copy.

2) Place the copy in the cassette tray face down (solid black facing downward).

3) Press the service mode switch (SW850) with a hex key.

• The machine starts service mode and indi-

cates ‘1’.

4) Press ‘4’ on the numeric keypad.

• The display indicates ‘4’.

5) Press the AE key.

• The machine enters operation/inspection

mode and indicates ‘401’.

6) Press ‘6’ on the numeric keypad.

• The display indicates ‘406’.

7) Press the Start key.

• The paper will be fed from the cassette, and

the machine will be ready to accept new settings as in Figure 2-223. (The paper will be discharged.)

17 Mounting the Oil Application

Solenoid

Screw the oil application solenoid in place where its lever is lightly in contact with the support of the oil application roller.

Figure 2-224

Reference:

The paper stops while half of it is held between the fixing rollers; it will then be discharged fully about 10 sec later.

8) Measure the nip.

16 Points to Note After Replacing

the Upper Fixing Unit

If you replaced the upper fixing unit, you must enter the temperature offset value of the heater using service mode No. 304. (See p. 7-10)

2–9

STANDARDS AND ADJUSTMENTS

18 Routing the Drive Belt

Be sure to attach the drive belt on the pulley and the tensioner as indicated in Figures 2-225 and 2-226.

Pulley

Vertical path roller gear

Drive belt

Tensioner

Figure 2-225

Main motor

2–10

Tensioner

Vertical path roller clutch (CL7)

Figure 2-226

STANDARDS AND ADJUSTMENTS

19 Positioning the Primary Charging Roller Cleaning Solenoid

Loosen the two screws used to fix the solenoid e in place, and move the solenoid in the direction of the arrow B so that the l in Figure 2-227 is 5.5 ±0.2 mm when the joint q is forced against the a section of the solenoid support plate w.

Caution:

You must make this adjustment whenever you have replaced the solenoid.

= 5.5 ± 0.2

Figure 2-227

2–11

STANDARDS AND ADJUSTMENTS

20 After Replacing the Drum Unit

Whenever you have replaced the drum unit, record the date and the counter reading on the label that comes with the drum unit; attach the label to the front cover of the new drum unit, and perform the Image Adjustment Basic Procedure.

Figure 2-228

21 Installing the Drum Heater*

*This may not be available for sale in some areas.

1) Remove the transfer guide from the copier.

2) Install the cord clamp w to the heater holder q.

4) Install the heater holder t to the transfer guide y with two screws r.

Figure 2-231

5) Install the transfer guide to the copier.

6) Connect the connector u of the heater to the copier’s connector.

Figure 2-229

3) Remove the transfer roller and the static eliminator.

Figure 2-230

2–12

Figure 2-232

Caution:

As necessary, keep the heater harness in place on the cord guide using tie-wraps.

STANDARDS AND ADJUSTMENTS

2 1

22 Assembling the Mirror Position-

ing Tool

1) Remove the screw from position B indicated in Figure 2-233.

Position B

Longest pin

Note:

Shortest pin not used.

Figure 2-233

Medium-Length pin

23 Positioning the Paper Deflecting

Plate Solenoid (SL8)

Loosen the two screws q, push the solenoid plunger to the arrow until the pin e reach to the bottom of slot, and fix the screw.

Figure 2-235

2) Fit the screw removed in step 1) in position A; then, tighten it slightly.

3) Spread the arm out of the main frame until it comes into contact with the stopper as indicated in Figure 2-234.

4) Fix the screw in place.

Position A

Figure 2-234

24 Setting the Deck Size

To change the paper deck size, change the position of the guide plate at the front, rear, and rear left.

1) Slide out the deck toward the front until it stops.

2) Remove the mounting screw from the guide

plate at the front, rear, and rear left; then, detach the guide plates.

Guide plate (rear)

Guide plate (left)

Screw

Guide plate (front)

Screw

Figure 2-236

2–13

STANDARDS AND ADJUSTMENTS

3) Fix each guide plate in position referring to the size indexes on the base plate, front side plate, and guide plates.

LTR

LTR A4

8) Install the switch cover.

9) Attach the size seal to the front cover of the deck.

10) Switch on the copier, and check that the new deck size is indicated in the message display.

25 Adjusting the Deck Registration

Detach the deck front cover, and loosen the mounting screws on both left and right of the deck (6 in total); then, move the latch assembly to the front and rear until the standards shown in Figure 2239 are met.

Figure 2-237

Caution:

Make sure that the front and rear guide plates are attached as follows:

• Perpendicular to the base plate of the deck.

• Parallel to the metal plates at the front and the rear.

4) Place paper in the deck, and slide the deck into the pedestal.

5) Open the right door of the deck.

6) Remove the switch cover.

7) Set the deck size switch to reflect the new paper size.

Figure 2-239 (left)

Screws

Screw

Figure 2-239 (right)

(-) (+)

0±1.5mm

2–14

Figure 2-238

0 2

4 6

8 10

Figure 2-240

STANDARDS AND ADJUSTMENTS

B. Electrical

1 Adjustment after Replacing

PCBs

You must perform the following adjustments

whenever you have replaced the following PCBs:

a. DC Controller PCB

1) Start service mode (adjustment mode [3]), and enter the settings indicated on the Service Mode label attached behind the front door.

2) Perform the multifeeder paper width sensor adjustment.

3) Perform scanning lamp intensity adjustment.

4) Perform AE adjustment.

As necessary, change the settings of service

mode and user mode.

Caution:

If you changed any of the settings indicated in the Service Mode label, be sure to record the new settings on the label.

b. Composite Power Supply PCB

1) Select service mode No. 315 through No. 318 (adjustment mode [3]), and enter the settings indicated on the label attached to the composite power supply PCB.

Be sure to record any new settings in the Ser-

vice Mode label.

2 Adjusting the Scanning Lamp

Intensity

Select service mode No. 407.

1) Place the Test Sheet NA3 on the copyboard, and close the copyboard cover.

2) Turn OFF AE, and make copies in continuous mode at copy density 5 and VR850 (DC bias) is at center.

3) Press the zoom + key or zoom - key so that the optimum image is obtained.

• If the image is too light, press the zoom + key.

• If the image is too dark, press the zoom - key.

Reference:

1. What is referred to as optimum image is an image in which gray scale No. 8 on the copy corresponds to gray scale No. 4 through No. 7 on the Test sheet whtile the copy is free of fogging.

2. Turning the VR excessively can cause E220 to be displayed. If this is the case, turn the VR 301 to the center position, turn OFF/ON the power, and make adjustments once again.

Caution:

After making the adjustment, be sure to perform AE adjustment.

3 AE Adjustment

c. AE Sensor PCB

1) Perform AE adjustment.

Caution:

If you changed any of the settings indicated in the Service Mode label, be sure to record the new settings on the label.

d. Light Adjustment Sensor PCB

1) Perform scanning lamp intensity adjustment.

2) Perform AE adjustment.

Caution:

If you changed any of the settings indicated on the Service Mode label, be sure to record the new settings on the label.

Perform AE adjustment using the following three service modes: q AE Basic Adjustment

No. 410 scanner forward stop No. 408 scanning lamp ON check No. 208 AE sensor voltage display No. 301 AE scan lamp intensity automatic ad-

justment

w No. 302 AE mode copy density (developing

bias) reference adjustment

e No. 303 AE mode copy density (developing

bias) slope adjustment

If the copy density is not optimum after performing AE basic adjustment q No. 410, No. 408, No. 208, and No. 301, try w No. 302 and e No. 303 in sequence.

2–15

STANDARDS AND ADJUSTMENTS

If you have replaced the AE sensor, scanning lamp, or DC controller or if you performed scanning lamp intensity adjustment (VR301), you must perform

• AE basic adjustment,

• No. 410 scanning forward stop,

• No. 408 scanning lamp ON check,

• No. 208 AE sensor voltage indication, and

• No. 301 AE scanning lamp intensity automatic adjustment.

Go through the steps that follow when making these adjustments. Table 2-201 gives a list of three service modes excluding No. 408 scanning lamp ON check and No. 208 AE sensor voltage indication.

a. AE Basic Adjustment (No. 410, No. 408,

No. 208, No. 301)

In this adjustment, the intensity of the scanning lamp is read by the lamp intensity sensor, and the voltage of the AE sensor unit is adjusted using VR860/851 on the service switch PCB.

After making the adjustment, you must perform AE scan lamp intensity automatic adjustment.

1) Place the Test Sheet NA-3 on the copyboard,

and close the copyboard. Press the service mode switch (SW850) to start service mode.

2) Press ‘4’ on the numeric keypad, and press the

AE key.

• The display indicates ‘401’.

3) Press ‘410’ on the numeric keypad.

• The machine indicates ‘410’.

4) Press the Start key once.

• The scanner moves forward.

Caution:

Each press on the Start key causes the scanner to move forward. Be sure not to press it more than once.

9) Press the Start key.

• The display indicates ‘0’ through ‘255’.

10) Adjust VR860/851 on the Service switch PCB so that the display indicates ‘100’ through ‘105’.

11) Turn OFF/ON the power switch.

• This turns OFF the scanning lamp and turns

ON the power once again.

12) Press the service mode switch.

• The machine start service mode and indi-

cates ‘1’.

13) Press ‘3’ on the numeric keypad, and press the AE key.

• The display indicates ‘301’.

14) Press the Start key.

Caution:

Wait until initial rotation ends.

• After initial rotation, the AE indicator starts to

flash.

15) Press the AE key so that the following takes place to perform automatic adjustment.

• The AE indicator stops flashing and remains

ON.

• The scanner moves to the AE measurement

point.

• When the intensity has stabilized, the reading

of the AE sensor is stored.

• The lamp turns OFF, and the scanner returns.

16) After the above ends, press the Clear key twice.

• The display indicates ‘3’.

17) Press ‘1’ on the numeric keypad, and press the AE key.

• The display indicates ‘1’.

18) Press ‘116’ on the numeric keypad, and press the Start key.

• Make sure that the display indicates ‘68’

through ‘72’. If not, start with step 2) of operation/inspection mode and make adjustments once again.

5) Press ‘408’ on the numeric keypad, and press the Start key.

• The display indicates ‘ON’, and the scanning

lamp turns ON about 1.5 sec later.

6) Press the Clear key twice.

• The display indicates ‘4’.

7) Press ‘2’ on the numeric keypad, and press the AE key.

• The display indicates ‘201’.

8) Press ‘208’ on the numeric keypad.

• The machine indicates ‘208’.

2–16

b. AE Mode Copy Density (developing bias)

Reference Point Adjustment (No. 302)

1) If the display does not indicate ‘300’s’, start adjustment mode of service mode as you would for No. 301.

2) Press ‘2’ on the numeric keypad.

• The display indicates ‘302’.

3) Press the Start key.

• The display indicates the current setting.

4) Change the setting using the numeric keypad, and press the AE key.

• To increase the setting, press the AE key.

+ 116 hidden pages

Canon NP6621 Service Handbook

CONTENTS

CHAPTER 1 MAINTENANCE AND INSPECTION

I. SERVICING CHART

II. PERIODICALLY REPLACED PARTS

III. DURABLES

IV. MAINTENANCE AND INSPECTION

CHAPTER 2 STANDARDS AND ADJUSTMENTS

A. Mechanical

B. Electrical