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19 The copy has horizontal fogging.
Cause
Step
Scanning
1
lamp
Drum unit,
2
High-voltage
transformer
assembly
Scanning
3
system
Feeding
system
20 The copy has poor sharpness. (out-of-focus)
Cause
Step
------------
1
Original
2
Lens
3
Mirror
4
position
Scanner
5
Drum unit
COPYRIGHT © 1999 CANON INC.
Checks
Does the scanning lamp flicker?
Replace the drum unit. Is the problem
corrected?
Make a reduced copy, and compare it
against one made in Direct. Is the
problem found at different positions?
Checks
Is the image also too light?
Is the original off the copyboard glass?
Turn off and then on the power switch.
Does the lens move smoothly?
Is the horizontal ratio in Direct within
specification?
Clean the scanning lamp, reflecting
plate, mirror, and lens. Is the problem
corrected?
CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO
YES
Replace the scanning
lamp.
YES
End.
NO
Check the high-
voltage transformer
(composite power
supply PCB).
YES
Check the scanning
system.
NO
Check the feeding
system.
YES/NO
YES
Correct the light
image problem first.
YES
1. Check the
copyboard cover too
see if it happens to
be warping.
2. Instruct the user on
the correct method
of placing originals.
NO
Check the lens rail for
foreign matter, and
clean it.
NO
Adjust the distance
between No. 1 mirror
and the No. 2 mirror.
YES
End.
NO
Replace the drum unit.
Action
Action
11-63
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