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
2
1
5
3
4
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
1
2
3
4
5
Old
Old
Old
Old
New
New
New
New
New
No. Description Part number Q’ty
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
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-
312-

- 3/3 -
6251-003 Rev. 1
Service parts
P.C.Old
New
Old
6
7
8
9
10
11
Old
Old
Old
Old
Old
New
New
New
New
New
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
Shaft, separation
Spring, tension
Spring, tension
Ring, E
Bearing
Deck left pick-up assembly
Deck left pick-up assembly
Inter-
change-
ability
❈2
❈2
❈2
❈2
❈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-
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

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
p
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

- 1 / 5 -
Service Bulletin
Issued by Canon Europa N.V.
Model : NP6251 No.: 6251-005 Rev. 1
(FF-T01-H2-000004-01)
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

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

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 Sensor
Motor
Metal plate
Ground wire
terminal
Cable ties
Side guide plate (rear)
Rear view
Edge saddle
Motor cable

6251-005 Rev. 1
- 4 / 5 -
Fig. 3 Side guide mount
Service Parts :
No. Description Part number Q’ty Inter-
change-
ability
P.C.
-- -- -- -- -- -- -- -- --
1Old 338-
New CABLE, SIDE LIMIT FG5-5022-020 1

0
2Old 338-
New MOUNT, MOTOR FG5-5023-020 0  1
3Old 338-
New CABLE, CONNECT FG5-5024-020 0  1
4Old HOLDING TRAY DRIVER PCB ASS’Y FG5-8758-000 1
 0335-21
New HOLDING TRAY DRIVER PCB ASS’Y FG5-8758-020 0  1
5Old SIDE LIMIT ASS’Y FG5-4422-040 1
 0338-
New SIDE LIMIT ASS’Y FG5-4422-070 0  1
6Old HOLDING TRAY ASSEMBLY FG5-8666-000 1
 0338-
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.

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

- 1 / 6 -
Service Bulletin
Issued by Canon Europa N.V.
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 specifications
as to the limit in the
number of copies requested
Previous versions do not accept a number higher than the limit in the
number 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
1ON
COPIER

6251-006 Rev. 2
- 2 / 6 -
No. Item Description
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 increments
between 1 and 2 hr; and 3 or 4 hr between 3 and 4 hr.

6251-006 Rev. 2
- 3 / 6 -
No. Item Description
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

6251-006 Rev. 2
- 4 / 6 -
•Bug corrections
No. Item Description
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 mode
function In previous versions, the machine picks up paper from a cassette not containing 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 to
two-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 be
indicated 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.

6251-006 Rev. 2
- 5 / 6 -
•Accommodating New Stapler Models
No. Item Description
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’ty Inter- chan
g
e-
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
New EP-ROM FF3-2372-07G 0→1
5 Old EP-ROM FF3-2373-00G 1→0 930-1
New EP-ROM FF3-2373-07G 0→1
6 Old EP-ROM FF3-2374-00G 1→0 930-2
New EP-ROM FF3-2374-07G 0→1
7 Old EP-ROM FF3-2375-00G 1→0 930-1
New EP-ROM FF3-2375-07G 0→1
8 Old EP-ROM FF3-2376-00G 1→0 930-2
New EP-ROM FF3-2376-07G 0→1
9 Old EP-ROM FF3-2379-000 1→0 930-1
New 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