![Canon NP6412 Service Manual Download Page 348](http://html.mh-extra.com/html/canon/np6412/np6412_service-manual_62358348.webp)
CHAPTER 11 TROUBLESHOOTING
COPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
11-62
15 The copy has a misplaced leading edge. (extremely excess margin)
16 The copy has a misplaced leading edge. (excess margin)
17 The copy has a misplaced leading edge (no margin)
YES/NO
NO
NO
YES
NO
NO
YES
Cause
Pickup
roller,
Pickup
clutch,
Cassette
Sensor
(PS1), Light-
blocking
plate
Image
leading edge
margin
Solenoid
(SL2), DC
controller
PCB
Copy paper
Registration
clutch
Step
1
2
3
4
5
Checks
Make copies using the cassette and
manually. Are the results the same?
Are the scanner home position sensor
(PS1) and the light-blocking plate
normal? (See the instructions on how
to check the photointerrupter.)
Execute image leading edge margin
adjustment. Is the problem corrected?
Does the registration clutch solenoid
(SL2) operate normally?
Is the paper of a recommended type?
Action
Check the pickup
roller, pickup clutch,
and cassette. Or,
replace them.
Replace the sensor, or
check the light-
blocking plate.
End.
1. Check the solenoid
(SL2).
2. Check the DC
control PCB.
Try a recommended
type. If the results are
good, ask the user to
use a recommended
type.
Check the registration
clutch.
18 The copy has a blurred image.
YES/NO
YES
YES
YES
YES
NO
Cause
Scanner
drive cable
Scanner rail
------------
Feeding
system
Drum unit
Step
1
2
3
4
Checks
Does the cable wind on itself when the
scanner is moving? Or, is the cable too
slack or too taut?
Move the No. 1 mirror mount slowly
by hand. Does it move slowly?
Is abnormal noise heard from the
scanner motor?
Does the copy paper spring up or stop
around the transfer assembly?
Action
1. Route the cable
correctly.
2. If the cable is
twisted or frayed,
replace it.
Clean the surface of
the scanner rail with
alcohol. Then, apply
lubricant. (CK-0551)
See "The scanner fails
to move forward/in
reverse."
Check the feeding
assembly for burrs.
Replace the drum unit.
Summary of Contents for NP6412
Page 6: ......
Page 12: ......
Page 34: ......
Page 46: ......
Page 48: ......
Page 92: ......
Page 144: ......
Page 176: ......
Page 178: ......
Page 192: ......
Page 194: ......
Page 220: ......
Page 222: ......
Page 256: ......
Page 258: ......
Page 282: ......
Page 284: ......
Page 286: ......
Page 384: ......
Page 388: ......
Page 414: ......
Page 424: ......
Page 430: ......
Page 432: ......
Page 434: ......
Page 484: ......
Page 492: ......
Page 502: ......
Page 506: ......
Page 516: ......
Page 599: ...PRINTED IN JAPAN IMPRIME AU JAPON ...