Canon 1130 Service Manual page 680

Cause
------------
Toner
concentration
sensor
DC driver PCB,
CPU PCB
Gradation sensor
Stray light
Black toner
concentration
sensor
Photosensitive
drum
DC driver PCB,
CPU PCB
COPYRIGHT © 2002 CANON INC.
Step Checks
5 Is E020 indicated for Bk? (Is it
E020=04xx?)
6 Replace the toner concentration
sensor of the color for which E020
is indicated. Is the problem
corrected?
7 Is the gradation sensor mounted
correctly? (CLC1140/1160/1180
only)
8 Is the copier's front cover left open
after the transfer unit front cover is
removed (i.e., is the black toner
concentration sensor subjected to
stray light)?
9 Replace the photosensitive drum. Is
the problem corrected?
CANON CLC1100/1130/1150/1160/1180 REV.1 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
Yes/No
YES Go to step 7.
YES End.
• When you have
replaced the toner
concentration sensor,
be sure to replace the
developer also.
(After replacement,
execute the work
under II. C. 9. or II. C.
6.)
NO Replace the DC driver
PCB or the CPU PCB.
(After replacement,
execute the work under
II. H. 10. or II. H. 1.)
YES End.
NO Replace the gradation
sensor.
(After replacement,
execute the work under
II. C. 7.)
YES Mount the transfer unit
front cover.
NO Replace the black toner
concentration sensor.
• If you have replaced
the toner concentration
sensor, be sure to
replace the developer
also.
(After replacement,
execute the work
under II. C. 9. or II. C.
6.)
YES End.
NO Replace the DC driver
PCB or the CPU PCB.
(After replacement,
execute the work under
II. H. 10. or II. H. 1.)
Action
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