Canon NP6512 User manual

COPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
REVISION 0
FY8-23B7-000
AUG. 1999

COPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
IMPORTANT
THIS DOCUMENTATION IS PUBLISHED BY CANON INC., JAPAN,TO SERVE AS A SOURCE
OF REFERENCE FOR WORK INTHE FIELD.
SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN MAY VARY SLIGHTLY
FROM ACTUAL MACHINE VALUES OR THOSE FOUND IN ADVERTISING AND OTHER
PRINTED MATTER.
ANYQUESTIONSREGARDINGINFORMATION CONTAINED HEREIN SHOULDBEDIRECTED
TOTHE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY.
THIS DOCUMENTATION IS INTENDED FOR ALL SALES AREAS, AND MAY CONTAIN INFOR-
MATION NOT APPLICABLETO CERTAIN AREAS.
COPYRIGHT © 1999 CANON INC.
Printed in Japan
Imprimé au Japon
Use of this manual should be strictly su-
pervised to avoid disclosure of confidential
information.
Prepared by
OFFICE IMAGING PRODUCTSTECHNICAL SUPPORT DIVISION
CANON INC.
5-1, Hakusan 7-chome,Toride-shi, Ibaraki 302-8501 Japan

i
Model
NP6512
NP6612
NP7120
NP7120
NP7130
NP7130
NP7130F
Type
code
TWA
TXA
PUB
PUC
NVF
PTZ
NVH
Default
ratio
2R2E
2R2E
2R2E
2R2E
3R1E
2R2E
3R1E
ADF as
standard
√
√
Cassette
250 sheets
250 sheets
Universal
Universal
500 sheets
500 sheets
500 sheets
The notation “√” indicates that the item in question is available.
• This service handbook covers the models shown in the following table. Be sure to have
a good understanding of the difference from model to model before referring to this
handbook.

iii
CONTENTS
CHAPTER 1 MAINTENANCE AND INSPECTION
CHAPTER 2 STANDARDS AND ADJUSTMENTS
CHAPTER 3 ARRANGEMENT AND FUNCTIONS OF
ELECTRICAL PARTS
A. Periodically Replaced Parts.........1-1
B. Durables and Consumables.........1-1
C. Scheduled Servicing ....................1-1
A. Mechanical...................................2-1
B. ADF ........................................... 2-26
A. Sensors and Solenoids................3-1
B. Switches.......................................3-2
C. Lamp, Heater, Motor, Etc. ............3-3
D. PCBs ............................................3-4
1
2
3
4
C. Electrical ................................... 2-37
E. ADF ..............................................3-5
F. Variable Resistors (VR) and
Check Pins by PCB......................3-6
CHAPTER 4 SERVICE MODE
A. Outline..........................................4-1
B. Using Service Mode.....................4-1
C. Adjustment Mode (30) .................4-4
APPENDIX
A. General Timing Chart.................. A-1
B. Signals and Abbreviations .......... A-3
C. General Circuit Diagram ............. A-5
D. Special Tools ............................... A-7
E. Solvents/Oils ............................... A-8
F. Specifications.............................. A-9
5
D. Image Adjustment Basic
Procedure.....................................1-3
E. Points to Note for Servicing .........1-4
D. Operation/Inspection Mode (40) ..4-5
E. Machine Settings Mode (50)........4-6
F. Counter Mode (60).......................4-6
CHAPTER 5 SELF DIAGNOSIS
A. Self Diagnosis ..............................5-1

CHAPTER 1 MAINTENANCE AND INSPECTION
1-1
CHAPTER 1 MAINTENANCE AND INSPECTION
A. Periodically Replaced Parts
The machine does not have parts which must be replaced on a periodical basis.
B. Durables and Consumables
The machine does not have items designated as durables or consumables.
C. Scheduled Servicing
The machine does not have any parts which require scheduled servicing.
1

1-3
D. Image Adjustment Basic Procedure
Making Pre-Checks Adjusting the Optimum Density
Clean the parts.
Is the copy density
correction dial (VR107)
centered?
Set it at
the center.
Select non-AE, and set the copy density
adjusting lever to the middle index; then,
make two to three copies of the Test
Sheet (NA-3).
Check the following:
1. Density of gray scale No.9
2. Presence/absence of difference between front
and rear (Note 1)
3. Density of gray scale No.1 (good or bad; Note 1)
4. Fogging of background (Note 1)
NO
YES
Scanning system,
pickup/feeding system,
delivery assembly
Check the following:
1. Drum unit
2. Scanning lamp
3. AE sensor PCB
4. DC controller PCB
5. Composite power supply PCB
(See the appropriate troubleshooting
procedure.)
Is the optimum
density obtained by intensity
adjustment?
(Note 2)
Can the
deviation be corrected
using the copy density correction
dial (VR107)?
Is gray scale No. 9
barely visible?
END
YES
YES
YES
NO
NO
NO
Note:
1. The machine is not equipped with a function to
correct image faults. See the appropriate
troubleshooting procedure.
2. See p. 2-38.

1-4
E. Points to Note for Servicing
Lens
Part Tools/sovents Work/remarks
Reflecting plate
Blower brush
Blower brush
Cleaning.
Cleaning.
No. 1/No. 6 mirror
Scanning lamp
Blower brush or alcohol
and lint-free paper
Moist cloth
Cleaning with a blower
blush; if dirt cannot be
removed, use alcohol and
lint-free paper.
Cleaning.
Optical path
Feeding belt
Item Tool/solvent
Separation pad
Cloth moistened with
water*
Cloth
Dry-wiping.
Cleaning.
Pickup roller Cloth moistened with
water* or alcohol Cleaning.
ADF
Work/remarks
Part
Part
Part
Tools/sovents
Tools/sovents
Tools/sovents
Work/remarks
Work/remarks
Work/remarks
AE sensor
Inlet guide
Photosensitive
drum
Transfer charging
roller
Blower brush
Solvent
Toner
Lint-free paper
Cleaning.
Cleaning.
Do not use solvent; in
principle, do not touch or
clean. Never expose to
light.
Cleaning; do not use
water or solvent. Do not
touch, and take care not
to soil with solvent and oil.
Electrical unit
Part Tools/sovents Work/remarks
Multifeeder
pickup roller Moist cloth (well-wrung)
or alcohol Cleaning.
Multifeeder assembly
Part Tools/sovents Work/remarks
Cassette pickup
roller Moist cloth (well-wrung)
or alcohol Cleaning.
Cassette pickup assembly
Part Tools/sovents Work/remarks
Developing
cylinder Alcohol Cleaning.
Developing assembly
Part Tools/sovents Work/remarks
Static eliminator Special brush Cleaning.
Static eliminator
Part Tools/sovents Work/remarks
Feed belt Moist cloth Cleaning.
Feeding assembly
Part Tools/sovents Work/remarks
Registration roller
Transfer guide
Moist cloth
Moist cloth
Cleaning.
Cleaning.
Transfer guide assembly
Part Tools/sovents Work/remarks
Copyboard cover
Copyboard glass
Alcohol
Alcohol
Cleaning.
Cleaning.
Fixing assembly
Drum unit/Transfer charging roller
*Be sure to wring it well.

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-1
CHAPTER 2 STANDARDS AND ADJUSTMENTS
A. Mechanical
1. Copier
a. Leading Edge Non-Image Width
Make adjustments so that the leading edge non-image width is 2.0 ±1.5 mm when the Test
Sheet is copied in Direct.
2.0±1.5mm
Setting
Higher
Lower
Leading edge non-image width
Increases
Decreases
Table 2-1
Figure 2-1
Making Adjustments
1) Select '31' in service mode.
• The display will indicate '31'.
2) Press the Copy Start key.
• The existing setting will flash.
3) Change the setting by the +/- key.
• The setting may be between 0 and 99.
• For each '1', the non-image width will change by 0.24 mm.
4) Press the AE key.
• The setting will stop flashing and will remain on, indicating that it has been stored in
memory.
5) As necessary, press the Clear/Stop key once to return to item selection; or, press it once again
to end service mode.
Relationship between Setting and Leading Edge Non-Image Width
Caution:
If you have performed this adjustment, be sure to adjust the image leading edge margin.
2

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-2
b. Image Leading Edge Margin (registration activation timing)
Make adjustments so that the leading edge margin is 2.5 ±1.5 mm when the Test Sheet is
copied.
2.5±1.5mm
Setting
Higher
Lower
Image leading edge margin
Decreases
Increases
Table 2-2
Figure 2-2
Making Adjustments
1) Select '30' in service mode.
• The display will indicate '30'.
2) Press the Copy Start key.
• The existing setting will flash.
3) Change the setting using the +/- key.
• The setting may be between 0 and 99.
• The setting will change by 0.24 mm in terms of margin for each '1'.
4) Press the AE key.
• The setting will stop flashing and will remain on, indicating it has been stored in memory.
5) As necessary, press the Clear/Stop key once to return to item selection; or, press it once again
to end service mode.
Relationship between Settings and Image Leading Edge Margin
Caution:
Be sure to check that the leading edge non-image width is as indicated before performing this
adjustment.

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-3
c. Adjusting the Mirror Position (optical length between No. 1 mirror and No. 2 mirror)
If you have replaced the scanner drive cable, you must adjust the mirror position, by changing
the position of the cable retainer of the No. 1 mirror mount.
Reference:
1. As more and more copies are made, the cable tends to become slack, requiring adjustment.
2. If the optical length between the No. 1 mirror and the No. 2 mirror is not correct, the horizontal
reproduction ratio will be wrong, causing poor sharpness or blurred images.
1) Fit the mirror positioning tool (FY9-3009) as shown.
Figure 2-3
2) Remove the copyboard glass.
3) Loosen the screws used to secure the cable retainer at the rear and the front of the No. 1 mirror
mount [1].
Figure 2-4
[1]

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-4
4) Turn the cable drive pulley [3] so that the three shafts [2] of the mirror positioning tool for the
front and the rear may be arranged as shown.
Figure 2-5 (rear)
Figure 2-6 (front)
[3][2]
[2]
[2]
[2]

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-5
5) While keeping the condition of 4), tighten the positioning screw at the rear and the front of the
No. 1 mirror mount [1].
Figure 2-7 (rear)
Figure 2-8 (front)
[1]
[1]

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-6
d. Checking the Force of the Cassette Spring
If the force of the spring used to hold up the holding plate of the cassette is not correct, pickup
faults or the like can occur.
If a fault is suspected, check the force of the spring using a spring gauge (CK-0054), and
replace the spring if it is not as indicated:
Standard: 970 ±150 g
Making Measurements
Push the spring gauge against the middle of the spring as shown, and check to make sure that
the reading of the spring gauge is 970 ±150 g when the holding plate is 18 mm away from the
bottom of the cassette.
Figure 2-9
Spring gauge
(CK-0054)
Holding plate
18mm
Cassette spring Cassette

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-7
e-1. Routing the Scanner Drive Cable
Figure 2-10
Wind 1.5 times.(black
cable)
Wind 7.5 times.(silver-
colored cable)

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-8
e-2. Routing the Scanner Drive Cable
1. Before Starting the Work
Prepare the following:
• Mirror positioning tool (FY9-3009)
• Cable clip (FY9-3017)
• Adhesive tape
1) Set the mirror positioning tool as shown.
Figure 2-11
2) Prepare about five strips of adhesive tape (each one about 20 x 50 mm).
3) Remove the copyboard glass.
4) Disconnect the connectors (J101, J131) [1] from the DC controller PCB.
Figure 2-12
[1]

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-9
5) If the machine is equipped with an ADF, free the hook [2], and disconnect the two relay con-
nectors [3] from the left upper stay [4].
Figure 2-13
6) Remove the three screws [5], and detach the left upper stay [4].
Figure 2-14
[2] [2]
[2] [2]
[3]
[3]
[4]
[5]
[4][5]

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-10
7) Remove the four screws [7], and detach the lens cover [8].
Figure 2-15
[7] [7]
[8]