Canon NP6251 Reference manual

SERVICE BULLETIN COPIER

NP6251

MODEL:

Major quality issues

Field quality problems

Quality upgrade/production efficiency

Miscellaneous

LOCATION:

SUBJECT:

Issued by Canon Europa N.V.

LENS MOUNT

ADJUSTING IMAGE AFTER REPLACING THE LENS STAGE

Outline

Notification is made here of how to perform adjustment if for the reason of problem with the lens a lens

stage has been replaced, and then after this replacement the lens fails to yield good resolution.

Lens stage replacement procedure (refer to the Service Manual)

1) Disconnect the plug and remove the copyboard glass and lens hood.

2) Move the mirror 1 mount to the right and remove the stage wire fixture (1in Figure 1; 2 locations).

3) Remove the lens stage cable (2in Figure 1, Figure 2 enlargement; connector, ground wire).

After replacing the lens stage, attach the cable following the same path as before so that the movement of

the lens stage is not affected.)

4) Move the mirror 1 mount to the left direction.

5) Remove the light blocking curtain (3in Figure 1; 2 locations)

The light blocking curtain is pasted to the lens with two-sided tape; be careful when peeling off the light

blocking curtain so as to avoid tearing it (enlarged Figure 3). After replacing the lens stage, re-attach it

with a two-sided tape.

6) Remove the sheet guide (1) (4in Figure 1).

Sheet guide (1) is also attached to the new lens stage but since the light blocking sheet needs to be pasted

again, it is advisable to reuse the removed sheet guide.

7) Lift the left side of the lens stage and remove the bushing (5 in Figure 1) from the rail (2 locations).

8) After replacing the lens stage with a new one, attach the removed parts.

- 1/4 -

Fig. 1 Lens mount

Mirror mount 1

No.: 6251-001

(H2-12E-036)

DATE:30.01.98

Adjustment for obtaining good resolution

1) Set the lens position for DIRECT copying (power ON position).

2) Turn the power OFF and unplug the cord.

3) Remove the copyboard glass and lens cover.

4) Insert a jeweler's screwdriver (diameter: 2 mm) or hex wrench (1.5 mm) into the side hole of the lens

(diameter: 2 mm). At this time, the tip of the screwdriver must go through the oval hole on the cam plate

located under the side hole. (See Figures 4 and 5.)

- 2/4 -

6251-001

Fig. 2 Lens stage cable (enlargement) Fig. 3 Light blocking curtain (enlargement)

Fig. 4 Lens stage Fig. 5 Detailed side hole section

Cable clamp

Ground cable

Jeweler's screwdriver

Lens

Side hole section Cam plate Cam plate oval hole

Lens round hole

(2 mm in diameter)

Connector Remove the light blocking

curtain hooked here. Shaded part is attached with

two-sided tape; peel it off.

- 3/4 -

6251-001

5) If the screwdriver does not go through the oval hole on the cam plate, loosen the fixing screw of the cam

plate and move the cam plate in the Y direction, then put the screwdriver through the oval hole. (See

Figures 6 and 7.)

6) With the screwdriver through the oval hole, tighten the cam fixing screw by lightly pressing the cam shaft

(shaded part of Figure 8) against the side of the rail (toward the lens).

7) After attaching the removed parts, turn the power switch ON and check the image for DIRECT copying.

If good resolution is not obtained, repeat Steps 1 to 6 again. When good resolution is obtained, bond lock

the cam plate fixing screw.

Fig. 8 Fixing cam shaft

Fig. 6 Lens stage Fig. 7

Positional relationship of round hole and oval

hole when the lens side hole is seen from the top

Y direction

Cam plate Cam plate

fixing screw

Cam plate

fixing screw

Cam shaft

Lens

Oval

hole Round

hole

OK NG NG

- 4/4 -

6251-001

8) Check enlarged and reduced images

If enlarged or reduced images show that the lens fails to yield good resolution, loosen the image

enlargement (or reduction) lens rail fixing screw and bend the rail to either one of Y direction and tighten

the fixing screw. (See Figure 9.)

Check images again and if the lens still fails to yield good resolution, bend the rail in the opposite

direction.

When good resolution is obtained, bond lock the lens rail fixing screw.

Fig. 9 Lens rail

Service Parts

NP6251

P.C.

210-

Old

New

Old

1New

No. Description Part number Q’ty

0 →1

FG5-9408-000Stage, lens

Inter-

change-

ability

❈1

Y direction

Rail fixing screw (200% enlargement)

Lens rail

Rail fixing screw

(50% reduction)

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SERVICE BULLETIN COPIER

NP6251

MODEL:

Major quality issues

Field quality problems

Quality upgrade/production efficiency

Miscellaneous

LOCATION:

SUBJECT:

Issued by Canon Europa N.V.

DECK PICK-UP ASSEMBLY

IMPROVEMENT TO DURABILITY OF SEPARATION ROLLER

Outline

A bearing has been added to the separation roller support to improve the roller durability.

Details

[Phenomenon]

Paper pick-up fault

[Cause]

The sponge part of the separation roller becomes damaged because of a decrease in durability.

[Factory measures]

A bearing has been added to the separation roller support .

Measures for servicing

If the above phenomenon occurs, replace the parts below or the deck pick-up assembly.

- 1/3 -

FB2-7602-000 (replace)

New partOld part

Deck right pick-up assembly

FF5-3213-000 (replace)

FB3-9207-000

FF5-6397-000

XG9-0243-000 (new)

FB3-9207-000

FS6-2678-000

FB2-7602-000 (replace)

FS5-2983-000 (replace)

No.: 6251-003 Rev. 1

(H2-12E-033)

DATE: 24.07.98

- 2/3 -

6251-003 Rev. 1

Old part New part

Deck left pick-up assembly

Service parts

P.C.Old

New

Old

New

No. Description Part number Q’ty

2 →0

0 →2

1 →0

0 →1

1 →0

0 →1

1 →0

0 →1

FB2-7602-000

FB3-9207-000

FF5-3213-000

FF5-6397-000

FS5-2983-000

FS6-2678-000

XG9-0243-000

FG5-5801-020

FG5-5801-170

Arm, roller

Shaft, separation

Spring, tension

Bearing

Deck right pick-up ass’y

Inter-

change-

ability

❈1

No Yes

❈1 Interchangeable by replacing all 4 parts at the same time.

FB2-7709-000 (replace)

XD2-1100-402 (eliminated) FB3-9207-000

FF5-6397-000

XG9-0243-000 (new)

FB3-9207-000

FS6-2678-000

FB2-7709-000 (replace)

FS5-2984-000 (replace)

FF5-6406-000

FF5-3213-000 (replace)

XD2-1100-402 (eliminated)

FB2-7708-000 (replace)

FB2-7714-000 (eliminated)

312-8

312-41

312-52

312-

- 3/3 -

6251-003 Rev. 1

Service parts

P.C.Old

New

Old

New

No. Description Part number Q’ty

2 →0

0 →2

1 →0

0 →1

1 →0

0 →1

2 →0

0 →1

1 →0

0 →1

FB2-7709-000

FB3-9207-000

FF5-3213-000

FF5-6397-000

FS5-2984-000

FS6-2678-000

XD2-1100-402

XG9-0243-000

FG5-5804-000

FG5-5804-120

Arm, separation, left

Arm, separation

Shaft, separation

Spring, tension

Ring, E

Bearing

Deck left pick-up assembly

Inter-

change-

ability

❈2

No Yes

Affected Machines (“LPS version”)

Deck right pick-up assembly

CJB 00001 and later

DJB 00001 and later

Deck left pick-up assembly

CJB 01881 and later

DJB 00571 and later

313-16

313-31

313-39

313-505

313-

❈2 Interchangeable by replacing all parts at the same time.

- 1 / 2 -

Service Bulletin

Issued by Canon Europa N.V.

Model : NP6251 No.: 6251-004 Rev. 1

(FF-T01-H2-000006-01)

DATE: 24.07.98

Location : WASTE TONER DRIVE ASSEMBLY (FIXING ASSEMBLY)

Subject : CRACKING OF 49T PULLEY

Reason : To prevent cracking of the 49T pulley belonging to the fixing assembly waste toner drive assembly,

this pulley has been changed to a stronger type.

Details : [Phenomenon]

Jamming of the paper reaching the fixing assembly.

[Cause]

Cracking of the 49T pulley of the fixing assembly waste toner drive assembly.

[Factory measures]

The 49T pulley has been changed to a stronger type.

Old New

Fig. 49T pulley

Servicing : When the aforementioned phenomenon occurs, replace the old type 49T pulley with the new type 49T

pulley.

COPIER

6251-004 Rev. 1

- 2 / 2 -

Service Parts :

No. Description Part number Q’ty Inter-

change-

ability

P.C.

-- -- -- -- -- -- -- --

1 Old PULLEY, 49T FS2-3493-030 1



0280-13

New PULLEY, 49T FS6-0864-000 0



2 Old WASTE TONER DRIVE ASSEMBLY FG5-8721-070 1



0 280-

New WASTE TONER DRIVE ASSEMBLY FG5-8721-080 0



Affected machines

(

“Ja

anese version”

)

NP6251

NHU00039 and later

NGT00005 and later

NJE00001 and later

Affected machines (“LPS version”) 

NP6251

CJB00701 and later

DJB00283 and later

No Yes

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