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SERVICE BULLETIN COPIER

NP6251MODEL:

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 (1 in Figure 1; 2 locations).

3) Remove the lens stage cable (2 in 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 (3 in 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 itwith a two-sided tape.

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

2

1

5

3

4

No.: 6251-001

(H2-12E-036)

DATE: 30.01.98

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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 sectionCam plate Cam plate oval hole

Lens round hole(2 mm in diameter)

Connector Remove the light blockingcurtain hooked here.

Shaded part is attached withtwo-sided tape; peel it off.

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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 platefixing screw

Cam plate

fixing screw

Cam shaft

Lens

Ovalhole

Roundhole

OK NG NG

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- 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 oppositedirection.

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

Fig. 9 Lens rail

Service Parts

NP6251

P.C.

210-

Old

New

Old1

New

No. Description Part number Q’ty

0 → 1FG5-9408-000Stage, lens

Inter-change-

ability1

Y direction

Rail fixing screw (200% enlargement)

Lens rail

Rail fixing screw(50% reduction)

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6251-003 Rev. 1

Old part New part

Deck left pick-up assembly

Service parts

P.C.Old

New

Old1

2

3

4

5

Old

Old

Old

Old

New

New

New

New

New


2 → 0

0 → 2

1 → 0

0 → 1

1 → 0

0 → 1

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

Arm, roller

Shaft, separation

Shaft, separation

Spring, tension

Spring, tension

Bearing

Deck right pick-up ass’y

Deck right pick-up ass’y

Inter-change-ability

1

1

1

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


FS5-2984-000 (replace)

FF5-6406-000

FF5-3213-000 (replace)

XD2-1100-402 (eliminated)


FB2-7714-000 (eliminated)

312-8

312-41

312-52

312-

312-

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6251-003 Rev. 1Service parts

P.C.Old

New

Old6

7

8

9

10

11

Old

Old

Old

Old

Old

New

New

New

New

New

New


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

Shaft, separation

Spring, tension

Spring, tension

Ring, E

Bearing




2

2

2

2

2

No Yes

Affected Machines (“LPS version”)

Deck right pick-up assembly

CJB 00001 and later

DJB 00001 and later


CJB 01881 and later

DJB 00571 and later

313-16

313-31

313-39

313-505

313-

313-

2 Interchangeable by replacing all parts at the same time.

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Service Bulletin


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

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6251-004 Rev. 1

- 2 / 2 -

Service Parts :



P.C. -- -- -- -- -- -- -- --

1 Old PULLEY, 49T FS2-3493-030 1 0 280-13

New PULLEY, 49T FS6-0864-000 0 1

2 Old WASTE TONER DRIVE ASSEMBLY FG5-8721-070 1 0 280-

New WASTE TONER DRIVE ASSEMBLY FG5-8721-080 0

1

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

No Yes

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Service Bulletin



DATE: 27.11.98

Location : HOLDING TRAY ASSEMBLY/SIDE GUIDE PLATE ASSEMBLY

Subject : ERRONEOUS INDICATION OF JAMS AT DUPLEXING UNIT

Reason : A circuit for removing electrical noise has been added to prevent erroneous indication of jam in the

duplexing unit for that cause.

Details : [Phenomenon]

Erroneous indication, “Remove jammed paper from the unit ”, is displayed while no jam has

actually occurred.

[Cause]

Malfunction of the recycle motor due to electrical noise causes the above symptom.

[Factory measure]

1. A circuit to remove the noise has been added to the holding tray driver PCB.

2. Grounding wire has been added to the side cable.

3. Grounding wire has been added to the motor cable.

4. Grounding wire has been added to the connect cable.

Servicing : Replace all the parts shown below simultaneously when the above symptom occurs.

Item Part Number Quantity Remarks

HOLDING TRAY DRIVER

PCB ASSEMBLY

FG5-8758-020 1 For the NP6251

CABLE, SIDE FG5-5022-020 1

CABLE, MOTOR FG5-5023-020 1

CABLE, CONNECT FG5-5024-020 1

TIE, CABLE WT2-5041-000 2 Secure the motor cable to the motor cable

mount.

CLIP, CABLE WT2-5178-000 3 Secure the motor cable to the side guide mount.

TIE, CABLE WT2-0300-000 2 Secure the side connect cable to the side guide

mount.

COPIER

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6251-005 Rev. 1

- 2 / 5 -

1. Location for replacement parts

The figure shows the location for parts to be replaced and cable connections with the side guide

mount detached from the holding tray assembly and the side guide plate (rear) detached from the

side guide mount.

The method for installing cables is described on the next page.

Fig. 1 Location for replacement parts

Additional part

Holding tray assembly

Side guide mount

Side guide plate

(rear) assembly

Additional

Tighten the ground wire terminal of the

connect cable along with the screw.

Side cable

Tighten the ground

wire terminal of the

motor cable along

with the screw.

Motor cable

Connect cable

Holding tray driver PCB

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6251-005 Rev. 1

- 3 / 5 -

2. Side guide plate (rear)

Installing the motor cable to the side guide plate (rear) (see Fig. 2)

Connect the connector of the cable to the PI sensor.

Temporarily clamp the cable ties at two locations of the cable and insert them into the respective

holes in the metal plate.

Tighten the cable ties while avoiding too much slack in cable (cut excess length of the cable ties).

Insert the cable through the edge saddle. Connect the connector of the cable to the motor.

Ground wire terminal of the cable along with the metal plate on the side guide plate (rear).

Fig. 2 Side guide plate (rear)

3. Side guide mount

Installing the motor cable and the side cable on to the side guide mount (see Fig. 3)

Mount the side guide plate (rear) to the side guide mount. Be sure to insert the motor cable into

the place as shown circled in Fig. 3.

Mount the side cable to the side guide mount. Temporarily clamp the cable ties at three locations and insert them into the respective holes in the

side guide mount.

Tighten the cable ties while avoiding too much slack in cable (cut excess length of the cable ties).

Connect the connector of the motor cable and the side cable.

Temporarily clamp the cable ties at two locations of the motor cable.

Use screws to firmly retain the cable ties in position.

Tighten the cable ties while avoiding too much slack in cable at the part in the circle in Fig. 3 (cut

excess length of the cable ties).

PI SensorMotor

Metal plate

Ground wire

terminal

Cable ties

Side guide plate (rear)

Rear view

Edge saddle

Motor cable

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6251-005 Rev. 1

- 4 / 5 -

Fig. 3 Side guide mount

Service Parts :



P.C. -- -- -- -- -- -- -- -- --

1 Old 338-

New CABLE, SIDE LIMIT FG5-5022-020 1 0

2 Old 338-

New MOUNT, MOTOR FG5-5023-020 0 1

3 Old 338-

New CABLE, CONNECT FG5-5024-020 0 1

4 Old HOLDING TRAY DRIVER PCB ASS’Y FG5-8758-000 1 0 335-21

New HOLDING TRAY DRIVER PCB ASS’Y FG5-8758-020 0 1

5 Old SIDE LIMIT ASS’Y FG5-4422-040 1

0 338-New SIDE LIMIT ASS’Y FG5-4422-070 0 1

6 Old HOLDING TRAY ASSEMBLY FG5-8666-000 1 0 338-

New HOLDING TRAY ASSEMBLY FG5-8666-110 0 1

*1: Interchangeable only when all the parts are replaced simultaneously.

Side cable

Locking wire saddles

(locations parts) Motor cable

*1

*1

*1

*1

No Yes

No Yes

Cable ties (two locations)

*1

*3

Route the motor cable here.

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6251-005 Rev. 1

- 5 / 5 -

Affected machines:

NHU 00081 and later

NGT 00005 and later

NJE 00161 and later

Affected machines (“LPS version”):

NP6251

CJB 15406 and later

DJB 11456 and later

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- 1 / 6 -

Service Bulletin


Model : NP6251 No.: 6251-006 Rev. 2

(FF-T01-H2-000010-01)

DATE: 10.08.99

Location : DC CONTROLLER PCB

Subject : UPDATING PROM PROGRAM (VERSION 4 AND VERSION 7)

Reason : The PROM program has been updated by changing specifications and removing bugs.

Details : <Modifications in Ver. 7>

• Specifications

No. Item Description

1 Changing a message In previous versions, the message upon recovery from an interrupt made

during RDF copying mode reads: "Start with the first page original."

Since there is no need for starting with the first page original, the message

has been changed to read: "Press the Start key."

2 Changing the specificationsas to the limit in the

number of copies requested

Previous versions do not accept a number higher than the limit in thenumber of copies that can be requested. (The limit is set using COPY_LIM

in service mode *5*.)

Version 7 accepts such an input, but displays an alarm message in response

to a press on the Copy key, prompting the user to enter an appropriate

number for the number of copies to request.

3 Changing the method of

counting two-sided copies

The method of counting two-sided copies for the Copy Data Controller-A1

has been changed so that the total copy count is the result of "one-sided

copy count+two-sided copy count ×2."

4 Changing the sequence of

handling manually fed

sheets

Previous versions compute the length of the first sheet (manually fed free-

size paper), and uses the result to control the second and subsequent

copies.Version 7 uses the same sequence used to control the first copy for the

second and subsequent copies to control copying operation.

5 Adding cleaning mode to

service mode

A new mode (wire cleaning mode) has been added as WIRE_CLN to

service mode *4*. In the mode, all corona wires are cleaned simultaneously

and five times in sequence (3 min).

WIRE_CLN: 0 OFF

1 ON

COPIER

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6251-006 Rev. 2

- 2 / 6 -


6 Changing the specifications

for the side deck unit LED

The specifications used to control the LED of the side deck have been

changed so that

LED ON: Deck open and lifter motor off

LED OFF: Deck closed and lifter motor off

(The LED is also off while the lifter motor is on during

copying operation.)

LED blinking: Blinking while the lifter motor is on

7 Increasing the effective

area of buttons on the LCD

By way of preventing cracks in the LCD on the control panel, the area of

buttons within which a press is recognized has been increased:

"Reduce/Direct/Enlarge, Paper Select" on the standard screen (part of

Extended Functions mode) and "Close" on the Extended Functions Mode

screen.

8 Changing the notation of

Direct (100%) key

In previous versions, the notation used to represent 100% copying is

"DIRECT."

In version 8, the English ROM and Inch-configuration combination uses

the notation "DIRECT," while the English ROM and A-, AB-, or AB/Inch-

configuration combination uses the notation "1:1."

Other combinations use their appropriate language notations.

9 Complying with Energy

Star Tire2

The following changes have been made to comply with the requirements of

Energy Star Tire2:

1) Default mode is now "from one-sided original to one-sided copy"

instead of "from one-sided original to two-sided copy."

However, default mode for Inch-configuration remains the same as

"from one-sided original to two-sided copy." The notation 2SIDE_SL in

service mode *5* is disabled and dimmed.

2) New function which enables a switch-over to low-power consumption

mode has been added.

If no operation is initiated for a specific period of time after the end of a

job or a key operation, a switch-over is automatically made to low-power consumption mode. An item has been added to user mode timer

settings to enable changing of the time after which a switch-over is

made to low-power consumption mode.

The time may be set between 10 min and 4 hr; in 5-min increments

between 10 and 20 min; in 10-min increments between 30 and 50 min;

in 30-min increments between 1 and 2 hr; 3 or 4 hr thereafter. Initially,

the time is set to 15 min.

3) Changing the auto-power off time settings.

The range of time that may be set is now "between 10 min and 4 hr"

instead of "10 min and 24 hr."

The time may be set in 5-min increments between 10 and 20 min; in 10-

min increments between 30 and 50 min; and in 30-min incrementsbetween 1 and 2 hr; and 3 or 4 hr between 3 and 4 hr.

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6251-006 Rev. 2

- 3 / 6 -


9 Complying with Energy

Star Tire2

(Contd.)

So that models not designed for Energy Start Tire2 may also use the

updated ROM (Ver. 7), a DIP SW has been added to the DC controller

PCB to enable selection of Energy Star Tire2 compliance or non-

compliance. (See the diagram below.)

For this reason, it is important to find out whether or not the model is

designed for Energy Start Tire2 before replacing the DC controller PCB.

The use of an updated ROM on a DC controller PCB of previous version

will not update the machine to accommodate Energy Star Tire2.DC Controller PCB Available as a Temporary Measure

• A DIP switch (DIPSW 102) consisting of two circuits has been added to

the existing DC controller PCB.

• Compliance/Non-Compliance with Energy Star Tire2

Note that bit 2 is not used.

ON

1 2

SW102

DC Controller PCB (for temporary use)

DC Controller PCB Available as a Permanent Measure

• The change made provides four circuits instead of three for a DIP switch

(DIPSW101) on the DC Controller PCB.• Allows selection of compliance or non-compliance with Energy Star

Tire2.

Note that bits 1 through 3 possess their previous functions, and are set

to suit the site of installation.

ON

1 2 3 4

SW101

DC Controller PCB (for permanent use)

Bit 4 on SW101 Energy Star Tire2

ON Selects compliance

OFF Selects non-compliance

Bit 1 of SW102 Energy Star Tire2

ON Selects compliance

OFF Selects non-compliance

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6251-006 Rev. 2

- 4 / 6 -

• Bug corrections


1 Correcting the weekly

timer function

In previous versions, the weekly timer function fails on the ID Input screen

used to make ID mode settings. The contributing factor for the problem

has been removed.

2 Correcting the cover modefunction In previous versions, the machine picks up paper from a cassette notcontaining the cover pages, stops the paper at the registration roller, and

resets itself under the following sequential conditions:

Cover mode is selected.

The selected cassette runs out of cover pages.

The selected cassette is replenished with cover pages.

The Copy start key is pressed.

3 Correcting RDF

malfunction

Previous versions fail to deliver an original remaining on the copyboard

glass to the RDF tray if a jam occurs during the delivery of the last copy to

the sorter.

4 Correcting image faults Image faults (dirty image) occur on images on the backs of copies made on

paper larger than the originals in "two-sided original to two-sided copy"

and "punched hole erase" modes.

5 Correcting problem

encountered in use of ID

number

In the situation of using the copier machine with the Copy Data Controller-

A1 with its own power supply independent from the one for the copier, the

Controller retains the ID number inputted previously even after the power

for the machine main body is cut off. When the machine main body is

turned on again, a new ID number is not accepted since the Copy Data

Controller-A1 determines that an ID number acceptance has been already

made. This problem has been corrected.

6 Correcting a message The jam icon appearing in front of the message "Insert Control Card" has

been removed.

7 Correcting a bug If the Start key is pressed for a single original in "from one-sided original totwo-sided copy" mode using the RDF, the machine indicates the message

"Place Two or More Originals," and stops while issuing an alarm.

In response, if the Reset key is pressed or the original is removed and then

placed and the number of copies requested is changed, the motor will start

and continue to rotate for 50 sec without copying when the Start key is

pressed.

The software has been revised to correct the problem.

8 Correcting the message

display mechanism

Previous versions indicate the message "Remove Paper from Feeder" in

response to suspension of operation caused by an overstacking condition in

"feeder manual feed +non-sort stack" mode.

Since no paper is actually delivered to the feeder, the software is revised to

prevent the indication of this message. (The message, however, will beindicated if the feeder is opened and then closed after suspension of

operation caused by an overstacking condition.)

9 Correcting the machine

stoppage mechanism

In case of a machine stoppage because of the absence of toner in "feeder

manual" mode, previous versions indicate the message "Press Start Key"

when the machine is replenished with toner. But the key pressing operation

is disabled because the original has been delivered. And the machine does

not initiate auto-start even when an original is set in the feeder manual feed

slot. This problem of inhibiting the continuation of the ongoing job has

been corrected.

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6251-006 Rev. 2

- 5 / 6 -

• Accommodating New Stapler Models


1 Accommodating new

stapler sorter models

The software has been revised to enable the use of the Stapler Sorter-

E3/J1/K1. The new models are capable of holding 50 (instead of 25) sheets

of large size paper, and the software has been duly revised to accommodate

the increase. (Ver. 7 puts the limit to 50 when operations involve the use of

a new model.)

Servicing : Whenever replacing the EPROM or the DC controller PCB, be sure to disconnect the power plug from

the outlet before servicing the machine.

Service Parts : ←←←←

No. Description Part number Q’tyInter-

change-ability

P.C. -- -- -- -- -- -- -- --

1 Old EP-ROM FF3-2369-060 1→0 930-1

New EP-ROM FF3-2369-070 0→1

2 Old EP-ROM FF3-2370-060 1→0 930-2

New EP-ROM FF3-2370-070 0→1

3 Old EP-ROM FF3-2371-00G 1→0 930-1

New EP-ROM FF3-2371-07G 0→1

4 Old EP-ROM FF3-2372-00G 1→0 930-2


5 Old EP-ROM FF3-2373-00G 1→0 930-1


6 Old EP-ROM FF3-2374-00G 1→0 930-2


7 Old EP-ROM FF3-2375-00G 1→0 930-1


8 Old EP-ROM FF3-2376-00G 1→0 930-2


9 Old EP-ROM FF3-2379-000 1→

0 930-1New EP-ROM FF3-2379-070 0→1

10 Old EP-ROM FF3-2380-000 1→0 930-2

New EP-ROM FF3-2380-070 0→1

*1: Interchangeable by replacing all 2 parts at the same time.

*1

*1

*1

*1

*1

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6251-006 Rev. 2

- 6 / 6 -


change-ability

P.C. -- -- -- -- -- -- -- --

11 Old DC CONTROLLER PCB ASS’Y (AMS) FG5-9825-020 1→0 930-

New DC CONTROLLER PCB ASS’Y (AMS) FG5-9825-030 0→1

12 Old DC CONTROLLER PCB ASS’Y (FRE) FG5-9313-05G 1→0 930-

New DC CONTROLLER PCB ASS’Y (FRE) FG5-9313-06G 0→1

13 Old DC CONTROLLER PCB ASS’Y (GER) FG5-9314-05G 1→0 930-

New DC CONTROLLER PCB ASS’Y (GER) FG5-9314-06G 0→1

14 Old DC CONTROLLER PCB ASS’Y (ITA) FG5-9315-05G 1→0 930-

New DC CONTROLLER PCB ASS’Y (ITA) FG5-9315-06G 0→1

15 Old DC CONTROLLER PCB ASS’Y FG5-9317-050 1→0 930-

New DC CONTROLLER PCB ASS’Y FG5-9317-060 0→1

Affected machines (“LPS version”):

NP6251 (version 7)

CJB 01409 and later

DJB 00321 and later

No Yes

No Yes

No Yes

No Yes

No Yes

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SERVICE BULLETIN COPIERIssued by Canon Europa N.V.

MODEL: NP6251 No.: 6251-007 Rev. 1

(A9800572-02)Date: 10.08.99

SUBJECT: HEATER LAMP/CANON GIESSEN MADE MACHINE

There are discrepancies between the configuration of the Canon Giessen made machine and thedocumentation in the Parts Catalog. Since the specifications of the Canon Giessen made machine tocomply with the radio interference controls were not determined in time for the initial edition of the PartsCatalog, inclusion of the information from that edition was not possible.

From the first mass production machine of the Canon Giessen made 220V/240V machines, two

heaters have been installed to comply with the flicker and harmonic controls which are part of the radiointerference controls.The major differences in part numbers between the Parts Catalog and the Canon Giessen made220/240V machine are listed in the table below.

Description Parts Catalog GSN 220V/240V Q’ty

Heater H1 FH7-4441-000 FH7-4551-000 1

Heater H2 ---- FH7-4552-000 1

Fixing unit FG5-8639-000 FG5-9819-000 1

AC driver FG5-8864-000 FG6-0036-020 1

DC power supply FG5-4510-030 FG6-1572-000 1

Lamp regulator FH3-7173-000 FH3-7205-000 1DC Controller PCB Ass’y FG5-9312-000 FG5-9825-030 1

Note: The way to mount the heaters is the same as the way they are mounted for 100V/115V/120Vmachines.

Next time the Parts Catalog is revised, we will update it with the above information.

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- 1 / 3 -

Service Bulletin



DATE: 23.10.98

Location : HOLDING TRAY ASSEMBLY

Subject : WRAPPING OF COPY PAPER AROUND TRANSFER/SEPARATION CORONA ASSEMBLY

Reason : When a jam occurs in the holding tray assembly, the paper can at times get trapped along the joint of

the transfer/separation corona assembly. To prevent this problem, a guide has been added to the center

of the holding tray assembly (along its longer side).

Details : <Phenomenon>

A jam occurs in the holding tray assembly. When the paper gets trapped along the joint of the

transfer/separation corona assembly and copying is continued, leakage can lead to a serious quality

problem.

<Cause>

When making a double-sided copy, a jam is likely to occur if a sheet stacked on the holding tray

assembly curls greatly. When the fixing/feeding unit is slid out/in in this condition, the base plate of

the unit can hook the curled paper, causing the paper to get trapped along the joint between the

transfer/separation corona assembly and the main frame.

<Factory measure>

An upper guide is added to the holding tray assembly. (See Figure 1.)

Servicing : If the machine does not have an upper guide on its holding tray assembly, be sure to install the holding

tray upper guide unit as follows. (The upper guide unit contains the parts shown in the table below.)

COPIER

Important

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6251-008 Rev. 2

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List of components (upper guide unit)

No. Description Part number Q’ty Remarks

1 UPPER GUIDE, HOLDING TRAY FB2-8522-000 1

2 RETAINER, UPPER GUIDE FB2-8523-000 1 UPPER GUIDE UNIT

3 RETAINER, LOWER, UPPER GUIDE FB2-8524-000 1 FG6-3412

4 SCREW XA9-0628-000 1

Installing the Upper guide Unit

1. Open the front cover, and slide out the holding tray assembly to the front.

2. Insert the holding tray upper guide into the hole of the roller mount found at the center of the inlet

guide assembly.

3. Fit the upper guide retainer to the holding tray upper guide.

4. Fit the upper guide lower retainer to the upper guide from under the holding tray upper guide, and

secure it in place with screws.

The upper guide lower retainer has its own orientation. Be sure to fit it on the upper guide retainerin advance. It cannot be mounted unless it is oriented correctly.

Figure 1 Location of the Holding Tray Upper Guide

Screw

Holding tray upper guide

Upper guide lower retainer

Roller mount

Upper guide retainer

Holding tray assembly

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Service Parts :


change-ability

P.C. -- -- -- -- -- -- -- --

1 Old 335-

New UPPER GUIDE, HOLDING TRAY FB2-8522-000 0 1

2 Old 335-

New RETAINER, UPPER GUIDE FB2-8523-000 0 1

3 Old 335-

New RETAINER, LOWER, UPPER GUIDE FB2-8524-000 0 1

4 Old 335-

New SCREW, RS, M4x8 XA9-0628-000 0 1

5 Old HOLDING TRAY ASSEMBLY FG5-4405-210 1

0 335-New HOLDING TRAY ASSEMBLY FG5-4405-300 0 1

6 Old HOLDING TRAY ASSEMBLY FG5-8666-110 1 0 335-

New HOLDING TRAY ASSEMBLY FG5-8666-210 0 1

7 Old

New UNIT, UPPER GUIDE, HOLDING TRAY FG6-3412-000 0 1

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

Affected Machines (“LPS version”) :

NP6251

CJB 15178 and later

DJB 11396 and later

Affected Machines (“Japanese version”) :

NP6251

PCV 00511 and later

No Yes

No Yes

*1

*1

*1

*1

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Service Bulletin


Model : NP6251 No.: 6251-009(FF-T01-H2-000016-01)

DATE: 24.07.98

Location : PHOTOSENSITIVE DRUM ASSEMBLY

Subject : MEASURES TO TAKE WHEN BLURRED IMAGES OCCUR

Reason : Notification is made here of the measures to take when blurred images caused by the photosensitivedrum occur.


Blurred images caused by the photosensitive drum may occur over time (smeared images: screen dot

reproduction faults, text sharpness faults).

<Cause>

Resistance is lowered due to moisture in the air for the film (on the drum surface) made by chemical

bonding of discharged materials to the organic matters in the toner ingredients. The lowered resistance

causes the charge on the drum surface to shift sideways with the consequence of smearing and

blurring of images.

Servicing : If any of the following symptoms caused by the photosensitive drum occur in the field, use the drum-

cleaning powder (CK-0429) and follow the cleaning procedure described below. Also, when replacing

the cleaning blade (standard for periodical replacement is 500,000 copies), check the image; in case of

the similar symptoms, perform the drum cleaning by following the same procedure.

<Symptoms>

• Vertical band unevenness on half tones and screen dot images with a corresponding unevenness on

the photosensitive drum.

• Blurred images conceivably attributed to the photosensitive drum (because no other abnormality

can be found).

COPIER

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6251-009

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<Cleaning procedure>

1) Take the photosensitive drum from the process unit. (For instructions, see the Service Manual.)

2) Pour 0.2 to 03 g of drum cleaning powder (CK-0429) on lint-free paper, and moisten the lint-free

paper with 5 to 10 cc of alcohol.

3) While forcing the lint-free paper against the surface of the photosensitive drum, move it back and

forth in the drum axial direction as if to wipe its surface. (At this time, keep the width of the

strokes to 5 to 10 cm in the peripheral direction of the drum, and move back and forth the lint-feepaper about 15 to 20 times.)

4) When the alcohol has evaporated, dry wipe the surface of the photosensitive drum with new lint-

free paper.

If the surface is still uneven, go back to step 3). (Increase the strokes as necessary.)

5) Rotate the drum over (5 to 10 cm), and repeat steps 2) to 4). Repeat until the entire surface of the

drum has been covered.

<Notes for servicing>

• Adhered foreign matters cannot be removed just with solvent (alcohol); always be sure to use

cleaning powder (CK-0429).

• Clean the photosensitive drum before replacing the cleaning blade.• Evenly wipe from the front side end of the photosensitive drum to the rear side end.

• When performing Step 3, if there is too much drum cleaning powder or much of the alcohol has

evaporated, add more alcohol to the lint free paper. If it seems there is not enough drum-cleaning

powder, add to the lint free paper as required.

• After dry wiping the drum, be sure to check that no drum cleaning powder remains on the drum.

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Service Bulletin


Model : NP6251 No.: 6251-010(FF-T01-H2-000018-01)

DATE: 25.09.98

Location : EXTERNAL COVER

Subject : IMPROVING SAFETY

Reason : A protective sheet will be attached to the upper left stay so as to prevent intrusion of conducting

objects (metal chain, etc.) through the gap between the vertical size plate and the control panel.

Details : <Symptoms>

If a conducting object (e.g., chain or slender objets) drops through the gap between the vertical size

plate and the control panel, it can come into contact with the electrode of the scanning lamp.

<Cause>

A spacer was added under the vertical size plate to accommodate the change of the thickness of the

copyboard glass from 3 to 4 mm. As a result, the gap between the vertical size plate and the control

panel has increased to allow intrusion of objects. The problem in question is not relevant to machines

with a 3-mm glass sheet.

<Factory measure>

A protective sheet will be attached to the upper let stay. (See Figure 1.)

Figure 1 Location of the Factory Use Protective Sheet (for factory)

COPIER

Reference pointsfor attachment

Left tray coverVertical size plate

Spacer

Upper left stay

Protective sheet (double-sided adhesive tape whereshaded)

Important

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6251-010

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Servicing : If a protective sheet is not found in the upper left stay of the machine (i.e., if the machine's copyboard

glass is 4 mm in thickness), be sure to attach the protective sheet (FY1-1174) prepared for the field as

indicated in Figure 2.

The field use protective sheet (FY1-1174) is intended as a one-time measure, and will not be assigned

as a service part. In the near future, be sure to use the new protective sheet (FB4-9953; see Figure 1 for

its location).If you have removed the control panel of a machine which was provided with a field use protective

sheet, make sure that the field use protective sheet is under the control panel.

Attaching the Field Use Protective Sheet

1. Remove the vertical size plate and the left stay cover.

2. Insert the protective sheet between the upper left stay and the control panel, and attach it to the

upper left stay according to the reference points indicated in Figure 2.

3. Mount the left stay cover and the vertical size plate.

Figure 2 Location of the Field Use Protective Sheet

Reference pointsfor attachment

Left tray cover

Vertical size plate

Spacer

Upper left stay

A gap is found here.

Protective sheet (double-sided adhesive tape whereshaded)

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Service Bulletin



DATE: 27.11.98

Location : FIXING ASSEMBLY

Subject : OPEN CIRCUIT IN SUB THERMISTOR

Reason : The line used in the sub thermistor can suffer an open circuit, leading to 'E000'. To prevent this

problem, the sub thermistor will be changed to another type.

Details : <Symptom>

'E000' is indicated and in about 5 sec, the power switch turns Off.

<Cause>

The sub thermistor suffers an open circuit.

<Factory Measures>

The sub thermistor will be changed to a new type. (See the illustrations below.)

[Old type] [New type]

COPIER

Connector (white) Connector (yellow)

Change in the wire paths

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Service Bulletin



DATE: 10.12.99

Location : INTERNAL MACHINE COMPONENTS, CASSETTE UPPER PICK-UP ASSEMBLY, CASSETTE

LOWER PICK-UP ASSEMBLY

Subject : POOR RISING OF LIFTER

Reason : To prevent poor rising of the lifter as the consequence of poor engagement of the cassette rail 16T gear

(fan-type) and the pick-up assembly lift plate gear, the related parts have been changed.


Lifter fails to rise.

<Cause>

Poor engagement due to warping of the 16T gear and jolting of the lift plate gear.

<Factory measure>

• Addition of a reinforcement rib to the 16T gear. ( Fig. 1 )

• Addition of a shim washer to the lift plate. ( Fig 2 )

• Addition of a shim washer to the cassette pick-up assembly. ( Fig. 2 )

[Old type] [New type]

Fig. 1 16T gear

COPIER

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Fig. 2 Cassette pick-up assembly

Servicing : In case the above phenomenon occurs, change the 16T gear and the lift plate with the new types, and at

the same time add a shim washer ( 0.6mm thick ) to the cassette pick-up assembly.

Service Parts :


change-ability

P.C. -- -- -- -- -- -- -- --

1 Old GEAR, 16T FB2-7882-030 4→0 104-

New GEAR, 16T FB2-7882-050 0→4

2 Old PLATE, LIFT FF5-3063-000 1→0 310-, 311-

New PLATE, LIFT FF5-3063-030 0→1

3 Old 310-, 311-

New SHIM XD1-1106-216 0→1

Affected machines:

NP6251

220V: PCV00515 and later

240V: RBK00816 and later

Affected machines (“LPS version”): ←

NP6251

CJB16301 and later

DJB13296 and later

No Yes

No Yes

Shim washer (added)

Shim washer (added)

Lift plate

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Service Bulletin



DATE: 10.12.99

Location : HOPPER ASSEMBLY

Subject : PREVENTING DEFORMATION OF STIRRING SPRING

Reason : Changing the shape of the stirring spring in order to prevent "E020" indication due to a deformation of the stirring spring

Details : <Symptom>

"E020" indication

<Cause>

The hopper toner sensor fails to perform toner level detection correctly due to a deformation of the

stirring spring over its use life.

<Factory measure>

Change the shape of the stirring spring so that this part which has been a one-piece unit is now

subdivided into three separate parts.

[Old parts] [New parts]

Fig. 1 Before and after changing to the new parts

COPIER

Screw (eliminated)

E ring (eliminated)

Screw (used in common)

Stirring spring holder

Stirring spring separatorStirring spring

Washer

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6251-013 Rev. 1

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Servicing : When the aforementioned symptom is noted, replace the stirring spring or the hopper assembly to the

modified types.

In addition to conforming to this procedure, take precautions to avoid toner spills from the hopper

assembly upon replacing the stirring spring since this spring is used inside the hopper.

Special precautions to take in installing the new parts (see Fig. 2)

1. Insert the protruding point of the stirring spring separator onto the crevice point of the stirring

spring holder.

2. Push the stirring rod into the hole of the shaft until it stops, and fasten with a screw.

Fig. 2 Inst all ing the new part s

Screw

Crevice point

Protruding point

Stirring rod

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Service Parts :


change-ability

P.C. -- -- -- -- -- -- -- -- --

1 Old SPRING, STIRRING FB2-6979-000 1→0 620-

New SPRING, STIRRING FB2-8525-000 0→1


New HOLDER, SPRING, STIRRING FB2-8526-000 0→1


New WASHER FB2-8527-000 0→1

4 Old SCREW, M3 x10 XB1-2301-009 1→0 620-

New

5 Old RING, E XD2-1100-502 3→

2 620-New

6 Old HOPPER ASSEMBLY FG5-4387-130 1→0 620-

New HOPPER ASSEMBLY FG5-4387-150 0→1







*1: Interchangeable by replacing all five parts at the same time.

Affected machines:

NP6251

220V PCV00511 and later

240V RBK00570 and later


NP6251

CJB15576 and later

DJB12206 and later

No Yes

No Yes

No Yes

No Yes

*1

*1

*1

*1

*1

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Service Bulletin



DATE: 10.12.99

Location : MAIN DRIVE ASSEMBLY

Subject : MECHANISM TO DETECT FRAGMENTS OF PAPER REMAINING AT FIXING/DELIVERY

UNIT REAR SIDE

Reason : Papers jammed at the holding tray assembly may be pinched in the contact section of the

transfer/separation corona assembly; a mechanism has been added to detect this condition. For

information on preventing jams at the holding tray assembly, see Service Bulletin 6251-008 Rev. 2.

Details : A microswitch for jam paper detection has been installed near the main unit side contact section (main

drive assembly) of the transfer/separation corona assembly. This microswitch displays error code

“E013”* upon detecting jammed papers.

*: E013 code originally served the purpose of detecting waste toner feedscrew error. Now, this code is

also used to detect paper jams.

Servicing : The position and installation procedure for the paper jam detection mechanism are shown below.

<Installation position>

Remove the transfer assembly high voltage connector (FH2-9164-000) at the rear of the high voltage

transformer PCB assembly and install the new part at this position. (See Fig. 1.)

COPIER

High voltage transformer

PCB assembly

High voltage connector

Fig. 1 High voltage connector position

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<Procedure>

1. Install the new parts as shown in the figure below (Fig. 2). This part is called the high voltage

connector unit.

• Insert the shaft section of the flag (FB2-8521) into the hole (2mm diameter) of the flag holder

(FB2-8520).

• Be sure the installation direction of the microswitch of the high-voltage SW cable (FG6-3420) is

correct.

• After installing all new parts, check that the flag (FG2-8521) moves smoothly and presses the

microswitch.

2. Remove the fixing/waste toner drive assembly. (See the Service Manual for details of how to

remove the unit.)

3. Remove the high voltage connector unit.

4. Install the high voltage connector unit at the place where the transfer high voltage connector wasinstalled.

5. Remove the connector J780 of the waste toner relay cable (FG5-5045-000) connected to the

microswitch (MSW4) for the waste toner feedscrew locking condition. (See Fig. 3.)

6. Connect the cable connected to the microswitch of the high voltage connector unit between the two

middle connectors of the connector J780 (which were formerly directly joined) removed in Step 5.

(See Fig. 3.)

7. Reinstall the removed parts at their original locations.

Fig. 3 Microswitch wiring

High voltage connector unitHigh voltage connector

[Old] [New]

Fig. 2 High voltage connector

FH2-9230

FB2-8520

J780

FB2-8521

Connector here isconnected betweenthe two middleconnectors of theconnector J780

XB1-2400-609FG6-3420

MSW4

FG5-5045

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Service Parts :


change-ability

P.C. -- -- -- -- -- -- -- -- --

1 Old 250-

New HOLDER, FLAG FB2-8520-020 0→1

2 Old 250-

New FLAG FB2-8521-000 0→1

3 Old 250-

New CABLE, HIGH VOLTAGE SW FG6-3420-000 0→1

4 Old CONNECTOR, HIGH VOLTAGE FH2-9164-000 1→0 250-

New CONNECTOR, HIGH VOLTAGE FH2-9230-000 0→1

5 Old 250-

New SCREW, MACHINE M4×6 XB1-2400-609 0→2

6 Old MAIN DRIVE ASSEMBLY FG5-4457-100 1→0 250

New MAIN DRIVE ASSEMBLY FG5-4457-220 0→1

7 Old MAIN DRIVE ASSEMBLY FG5-8718-000 1→0 250-

New MAIN DRIVE ASSEMBLY FG5-8718-090 0→1

*1: Interchangeable by replacing all five parts at the same time.

Affected machines:

NP6251220V PCV00676 and later

PJY00001 and later

240V RBK00816 and later


NP6251

CJB16301 and later

DJB13296 and later

No Yes

No Yes

*1

*1

*1

*1

*1

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Service Bulletin


Model : NP6251 No.: 6251-015(FF-T01-H2-000031-01)

DATE: 08.01.99

Location : FRONT END PLATE

Subject : SOILING OF LENS AND IMPROVEMENT TO FACILITATE REPLACEMENT OF AIR FILTER

Reason : Air filter has been changed to prevent poor image from soiling of the lens. And along with this

change, the shape of the inner cover (left) has been changed to facilitate replacing the air filter in the

field.

Details : <Symptom>

Light image

<Cause>

If the machine is located in a place where there is a lot of dust, the dust collects inside the lens unit,

and a large amount adheres to the lens surface. As a result of this, the amount of light from the originalillumination lamp increases to result in a light image.

<Factory measure>

To reduce the amount of dust inside the machine, the air filter has been changed. Also, the shape of

the inner cover (left) has been changed to make possible replacing the air filter without the need to

remove the inner cover (left).

COPIER

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Service Bulletin



DATE: 10.12.99

Location : CASSETTE

Subject : CORRECTING PROBLEMS WITH CASSETTE AND IMPROVING EASE OF ITS USE

Reason : Measures have been taken to prevent damage to the handle latch, damage to the release arm, and

displacement of the spring for the tab of the latch and to prevent wrong setting of the paper width.

Details : <Symptom>

1. The cassette is not locked when it is closed (possibly damaging the handle latch).

2. The cassette is not locked when it is closed (possibly damaging the release arm).

3. The torsion spring used in enabling to push the tab on the front side size plate becomes displaced.

4. The control panel indicates an Inch-size paper when an AB-size paper is selected.

<Cause>1. The strength of the handle latch is not adequate.

2. The strength of the release arm is not adequate.

3. If the locking plate of the front side size plate does not fit into the positioning slot smoothly, one

may try to forcefully move the latch provided with a tab. The latch will then go completely past

where it should normally stop with the result of displacing the torsion spring used for the tab of the

latch.

4. The paper size positioning slots for the AB papers and that for the Inch papers are in proximity to

each other inside the cassette. As such, the front side size plate can inadvertently be positioned

into the Inch-size positioning slot.

COPIER

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6251-016 Rev. 1

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<Factory measure>

1. Change the shape of the handle latch to increase its strength. (Figure 1)

2. Use POM instead of ABS as the material for the release arm to increase its strength.

Figure 1 Handle latch

New type (modification in shaded area)Old type

Reinforced

Figure 2 Release arm

New type

POM

FB1-8478-T1FB1-8478-T1

Old type

Identified as "POM" above

the part No. notation.

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<Procedure for sticking the sheet on the inside of the cassette>

1. Position the front side size plate to the slot marked A (STMT-R) on the paper guide plate of the

cassette.

2. Peel off the paper that will separate from the protective sheet and affix this sheet by using the front

side of the slot marked A as reference and cover the slots marked D, F, H, K, and L, in achieving

the affixing requirements.

Caution:

1. Make sure that the protective sheet is affixed in such a way that it is firmly pressed to the paper

guide plate of the cassette with no bulges.

2. Do not accidentally cover the slot marked A because this slot is to be used for registration of the

paper width standard value.

*Affix the protective sheet by

using the front side of the slot

marked A as a reference.

Protective sheet

Fig. 6 Affixing position for the protective sheet

Cassette

Front side size plate

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Service Parts :


change-ability

P.C. -- -- -- -- -- -- -- --

1 Old LATCH, HANDLE FB2-7756-000 1→0 300

New LATCH, HANDLE FB2-7756-020 0→1

2 Old LATCH FB1-8699-000 1→0 300

New LATCH FB1-8699-020 0→1

3 Old PLATE, SIZE, SIDE, FRONT FF5-1510-000 1→0 300

New PLATE, SIZE, SIDE, FRONT FF5-1510-030 0→1

4 Old 300

New SHEET FB3-8711-000 0→1

5 Old ARM, RELEASE FB1-8478-020 1→

0 300New ARM, RELEASE FB1-8478-030 0→1

*1: Interchangeable by replacing the two parts at the same time.


NP6251

CJB00001 and later

DJB00001 and later

No Yes

No Yes

*1

*1

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Service Bulletin


Model : NP6251 No.: 6251-017 Rev. 1

(FF-T01-H2-000035-01)

DATE: 10.08.99


Subject : PROCEDURES TO PREVENT FALLING DOWN OF RETAINING SCREW FOR BUSHING

PLATE (THE PLATE FOR TAKING THE RECIPROCATING MOVEMENT)

Reason : To communicate field procedures to prevent quality problems due to falling down of the retaining

screw for the bushing plate that takes the reciprocating movement.

Details : It is possible that the screw which retains the fixing assembly bushing plate (the plate that takes the

reciprocating movement) loosen and detach as the result of vibration or heat. If the screw detaches, it

can in the worst case fall down into the space between the thermoswitch and the reciprocating shaft to

permit a short circuit. This is to communicate a procedure to follow with machines in the field to

prevent this problem.

Servicing : During visits for servicing, replace the 6mm screw retaining the bushing plate with the 8mm screw,and at the same time do the additional work of tightening the nut.

< Precautions to take in proceeding with the work >

1. Begin the work after the fixing assembly has adequately cooled down.

2. Be careful not to scratch the fixing roller or the fixing web.

3. Check the attached bushing plate for taking the reciprocating movement and replace it if found

cracked.

COPIER

Important

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6251-017 Rev. 1

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< Proceeding with the work >

1) Removing the fixing web

• Refer to the service manual for the

procedure to follow in drawing out

the fixing/feeding unit and removing

the fixing web.

2) Removing the flywheel mount

• Remove the 2 screws [1], and

remove the flywheel mount.

3) Removing the flywheel

• Remove one E ring [2], and

remove the flywheel.

4) Removing the heater support plate and the

heater cord guide

• Remove the 2 screws [3] and remove the

heater support plate and the heater cord

guide.

[1]

Flywheel mount

Fixing web

(front side)

[2]

Flywheel

Heater cord guide

Heater support

plate

[3]

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6251-017 Rev. 1

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5 ) Removing the connector and the faston

and removing the cable from the wire

saddles (2 locations)

• Remove one connector [4] and the faston

[5]. Remove the cable from the 2 wire

saddles [6].

6) Removing the tension spring

attached to the inner side of the

drive support plate

• Remove one end of the spring (at

front) which is hooked to the armguide plate.

7) Removing the drive support plate

• Remove the 2 screws [7] and

remove the drive support plate.

While removing the plate, be

careful not to deform the leftward

section where the screw is used toretain the plate.

[5]

[6]

[4]

Unhook this part

Drive support plate

Spring at front

Arm guide

plate

Do not deform

this section.

[7]

[7]

Drive support

plate

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8) Replacing the retaining screw for the bushing plate (the plate that takes the reciprocating

movement) and tightening the nut.

• Replace the retaining screw for the bushing plate (the plate that takes the reciprocating

movement) with the 8mm screw (XB1-2400-807), and lightly tighten it until there is no

play for the bushing plate.

• With the screwdriver inserted into the screw, attach the nut (XB7-2100-409) to the screw

and tighten it firmly. While the nut is being tightened, restrain the movement of the screw

with the use of the screwdriver to prevent rotation of the screw.

9) Assembly

• Follow the procedure in reverse for assembly.

Service Parts :


change-ability

P.C. -- -- -- -- -- -- -- --

1 Old SCREW, MACHINE M4x6 XB1-2400-609 1→0 811- or 810-

New SCREW, M4x8 XB1-2400-807 0→1

2 Old 811- or 810-

New NUT, HEX M4 XB7-2100-409 0→1

Affected Machines (LPS version): ←←←←

CJB 16301 and later

DJB 13016 and later

No Yes

Screw (XB1-2400-807)

Bushing plate for taking

the reciprocating movement

Nut (XB7-2100-409)

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SERVICE BULLETIN COPIERIssued by Canon Europa N.V.

MODEL: NP6251 No.: 6251-018

Date: 09.07.99

LOCATION: FIXING UNIT

SUBJECT: INTRODUCTION OF NEW TYPE UPPER FIXING ROLLER

REASON

OHP film, other than the Canon approved type, tends to jam in the fixing unit.Jamming of OHP film in the fixing unit may cause the separation claws to damage the upper fixingroller’s soft coating.To prevent this from happening, a new type of fixing roller is introduced and will be available in additionto the currently used roller FB2-7200-000.

DETAILS

The new type roller has a hard layer which prevents, both, sticking of the OHP to the fixing roller and‘digging’ of the separation claws into the surface of the roller.It is noted that the image quality in the grey scale may differ with the new type roller; the soft roller typehas a better grey scale fixing.

SERVICING

If OHP film is frequently used and the upper fixing roller gets damaged, replace the originally usedupper fixing roller (FB2-7200-000) with the new type roller (FB4-2545-00E).

SERVICE PART

DESCRIPTION PART NO Q'TY

O

N UPPER FIXING ROLLER FB4-2545-00E 0 – 1

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Service Bulletin



DATE: 21.02.00

Location : PRIMARY CORONA ASSEMBLY, TRANSFER/SEPARATION CORONA ASSEMBLY

Subject : PREVENTING DIRT ON CORONA WIRE

Reason : If the environment where the main unit is set up is bad (dusty environment), the corona wire becomes

dirty easily, and poor images result. Because of this, a design change has been made to improve the

cleaning of the corona wire.

Details : <Symptom>

Poor images: Appearance of black spots

<Cause>

Dirt on the primary corona wire or the transfer corona wire

<Factory measures>

A strong polishing pad will be used to improve the cleaning of the corona wire. Because of this,

changes were made to the cleaner (cleaning block, felt folder) and guide pin.

Servicing : When the above problem is noted, replace (at the same time) the corona wire, cleaner (cleaning block,

felt holder), and guide pin of the primary corona assembly or transfer corona assembly with the new parts.

Also, in order to stabilize the surface layer of the new corona wire, be sure to perform wire cleaning

5 times from the user mode or service mode after replacement of the wire from the old type to new.

NP6251: Perform wire cleaning (WIRE_CLN) in service mode (∗4∗) for machines with ROM

Ver. 7 installed. For machines with a ROM version before Ver. 7, perform wire

cleaning 5 times in user mode.

COPIER

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Precautions to take in replacing the above parts:

1) The combination of the new cleaner (with strengthened polishing pad) and the old corona wire

(with gold plating) will cause the plating on the old corona wire to come off, resulting in uneven

images. Therefore, never use this combination.

2) Dirt on the corona wire of the pre-transfer corona assembly and the separation corona assembly

hardly affect images. Hence, conventional cleaner will be used.

3) The methods to identify between the old and new corona wire, cleaner, guide pin, and felt holder

are as follows. (See tabulated information and the Figures below.)

• Corona wire

Background color for the label Blue White

• Cleaner

New Part Old Part

Color of the cleaning block Blue Black

Color of the felt folder Blue Creamy white

• Guide pinNew Part Old Part

Width of pin assembly plate 9mm 6mm

Corona wire:Brown

Color of the cleaning block: Blue

Color of the felt holder: Blue

Fig. 2 New cleaner (cleaning block / feltholder)

Fig. 1 New corona wire

Background color for the

Color: Black

11mm (old: 8mm)9mm

Pin assembly

Fig. 4 New felt holderFig. 3 New guide pin

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Service Parts :


change-ability

P.C. -- -- -- -- -- -- -- --

1 Old WIRE, CORONA, 0.06MM(100M) FY1-0275-000 AR 550-

New WIRE, CORONA, 0.06MM(20M) FB4-3687-000 AR

2 Old GUIDE, PIN FF5-2975-000 2→0 550-,580-

New GUIDE, PIN FF5-6885-000 0→2

3 Old BLOCK, CLEANING FF2-3551-000 3→0 550-,580-

New BLOCK, WIRE CLEANING PAD FF5-6883-000 0→3

4 Old HOLDER, FELT FF2-3552-000 3→0 550-,580-

New BLOCK, WIRE CLEANING PAD FF5-6884-000 0→3

5 Old WIRE, CORONA, 0.06MM(100M) FY3-0040-000 AR 550-,570-,580-

New WIRE, CORONA, 0.06MM(20M) FB4-3687-000 AR

6 Old HOLDER FB2-7091-000 1→0 580-

New HOLDER, FELT FB3-8349-000 0→1

7 Old PRIMARY CORONA ASSEMBLY FG5-4378-030 1→0 550-

New PRIMARY CORONA ASSEMBLY FG6-3416-000 0→1

8 Old TRANSFER/SEPARATE CORONA ASS’Y FG5-4550-090 1→0 580-

New TRANSFER/SEPARATE CORONA ASS’Y FG6-3417-000 0→1

9 Old TRANSFER/SEPARATE CORONA ASS’Y FG5-8810-000 1→0 580-

New TRANSFER/SEPARATE CORONA ASS’Y FG6-3417-000 0→1

∗1: Replace four items at the same time (primary corona assembly and transfer/separation corona

assembly).

No Yes

No Yes

No Yes

∗1

∗1

∗1

∗1

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Service Bulletin


Model :

NP6251No.: 6251-020 Rev. 1

(FF-T01-H2-000040-01)

DATE: 10.12.99

Location : MACHINE FRONT PLATE

Subject : ATTACHING FRONT DOOR HINGE SHAFT

Reason : For efficiency in production, the shape of the hinge shaft was changed and this change enables

attachment of the hinge shaft with one hinge stop plate instead of two.

Details : A brim was added to the new hinge shaft with the consequence that the bottom hinge stop plate of the

hinge shaft is no longer needed. (See Figure below.)

Servicing : When replacing the hinge shaft with a new one, attach it with the end with the brim at the bottom.

COPIER

[New hinge shaft][Old hinge shaft ]

Stopper here is nolonger needed.

Hinge stop plate

Hinge shaftHinge shaft

Brim

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Service Parts :


change-ability

P.C. -- -- -- -- -- -- -- --

1 Old SHAFT, HINGE FB2-7867-000 1→0 101-

New SHAFT, HINGE FB2-7867-020 0→1

2 Old PLATE, HINGE STOP FB2-7866-000 2→1 101-

New

*1: Interchangeable by replacing all two parts at the same time.

Affected Machines (“LPS version”): ←

NP6251CJB00001 and later

DJB00001 and later

*1

*1

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Service Bulletin


Model : NP6251 No.: 6251-021

(FF-T01-H2-000042-01)

DATE: 10.08.99

Location : LENS MOUNT ASSEMBLY

Subject : CHECKING MOVEMENT OF LENS MOUNT WITH YOUR HAND

Reason : To communicate precautions to take in checking the movement of the lens mount with your hand after

replacing the mount wire or doing something else

Details : For checking the movement of the lens mount with your hand, do not turn the pulley (attached to the

motor for movement in Y direction) with your hand. The edge of the pulley is sharp and the practice

of turning the pulley in an attempt to move the mount can lead to injuring your hand. Following the

instructions given in the service manual, first remove the plug for the power supply, hold the lens

mount near where it engages with the rail, and then move it slowly. (Refer to the figure below and the

section concerned in the service manual.)

COPIER

Fig. 1 Lens mount assembly

Pulley

Rail

Lens mount

Mount wire

Important

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Service Bulletin


Model :

NP6251No.: 6251-022

(FF-T01-H2-000044-01)

DATE: 10.12.99

Location : FIXING UNIT

Subject : CLEANING THE OIL PAN

Reason : To communicate items to note so that service personnel will clean the fixing assembly oil pan safely.

Details : When cleaning the fixing assembly oil pan, do so while removing it from the main unit as little as

possible.

In cases where the oil pan is removed, clean it while taking care not to scratch yourself on its edges

(especially the inner edge).

COPIER

Fig. 1 Fixing Unit

Oil pan

Important

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Service Bulletin


Model :

NP6251No.: 6251-023

(FF-T01-H2-000048-01)

DATE: 10.12.99


Subject : FIXING ASSEMBLY ERROR CODES AND REPLACING THE FIXING HEATER

Reason : After replacing the fixing heater, if the heater terminal at the inner side of the fixing heater is bent, the

lead wire assembly will come in contact with the plate on the rear side of the main unit. If the lead

wire coating or the faston’s protective tube are damaged, there is the chance of a short against the rear

plate. (See Fig. 1)

COPIER

Fig. 1 Example of Lead Wire Making Contact

This lead wire does not

exist in some 200V

machines which haveonly 1 heater.

If this heater terminal is

bent in the direction of

the arrow, there is the

chance of a short. The

dotted line shows the

correct position.

Points where the lead wire makes contact

Heater terminal

Rear plate

Important

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Servicing : Check the following points when error codes related to the fixing assembly occur, or when the fixing

heater is replaced in the field. (See the service manual for fixing heater replacement procedures.)

1. The above problem can be considered to be the cause of the problem mentioned above in machines

which produce fixing assembly error codes, so check the dimensions as shown in Fig. 2. Measure

by placing the scale directly against the heater cover.

2. When removing and attaching the faston to and from the heater terminal when replacing the fixingheater, do not bend the heater terminal or scratch the faston’s protective tube. (See Fig. 3)

If the heater terminal is bent, replace it.

3. After replacing the fixing heater, check the dimensions as shown in Fig. 2.

Scale

Heater cover

When there is one fixing heater

When there are two fixing heaters

Fig. 2 Measurement of Lead Wire Height

A Dimensions: Less than 10.0mm

B Dimensions: Less than 16.0mm

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Service Bulletin


Model : NP6251 No.: 6251-024(FF-T01-H2-000046-01)

DATE: 14.01.2000

Location : FRONT DECK PAPER STOCK ASSEMBLY

Subject : SAFETY OF FRONT DECK PAPER STOCK ASSEMBLY

Reason : Protective tape is to be affixed to the edge of the paper limit plate of the right and left front deck paperstock assemblies, in order to improve safety.

(Right front deck paper stock only for the NP6045. )

Details : In order to improve safety when loading paper, protective tape will be affixed to the edge of the paper

limit plate of the right and left front deck paper stock assemblies.

The factory countermeasure will consist of removing burrs from the edges.

Servicing : When servicing in the field, lightly feel the edge of the paper limit plate. If there are any sharp burrs,

follow the steps below to tape them.

<Procedures>

1) Pull out the right and left front deck paper stock assemblies.

2) Clean the edge of the paper limit plate.

Use 5 or 6 sheets of lint free paper folded over twice.

3) Cover the edge of the paper limit plate with the protective tape.

Affix the protective tape so as to completely cover the edge.

Affix the protective tape by pinching it between the fingers and pressing it into place.

COPIER

When cleaning, take extra care not to injure your hands be rubbing strongly against the edge.

Caution :

Important

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Cut off.

Cut off.

Protective tape

Figure 1 Affix the protective tape

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Service Bulletin


Model :

NP6251No.: 6251-025

(FF-T01-H2-000050-01)

DATE: 21.02.00


Subject : CAUTION TO BE OBSERVED WHEN REMOVING FIXING ASSEMBLY

Reason : The way in which periodic maintenance is carried out may lead to burning of the fixing assembly AC

connectors. These cautions are provided in order to prevent this.

Details : When removing the fixing assembly from the main unit, if the AC line is not shut off, there may be an

arc discharge between the fixing assembly and the main unit connectors, causing the connectors to be

burned. In order to prevent this, the following procedure, which is already described in the service

manual, should be observed carefully.

COPIER

Fig. 1 Fixing assembly rear side

1. Before sliding out the fixing assembly, check to make sure that the

front door switch or the power switch is off.

2. Disconnect the power plug for safety before starting

disassembly/assembly work.

AC connectors

Important

!

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np6251

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