COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
13-333
CHAPTER 13 TROUBLESHOOTING
Code
Cause
· The toner concentration sensor is faulty/
soiled.
· The developer inside the developing
assembly is not stirred properly.
· The sensor is subjected to stray light (no
cover, front cover open).
· The photosensitive drum has
deteriorated.
· The toner concentration sensor is faulty.
· The developer inside the developing
assembly is not stirred properly.
· The sensor is subjected to stray light (no
cover, front cover open).
· The photosensitive drum has
deteriorated.
· The window of the toner concentration
sensor is soiled or scratched, or the
protective sheet is soiled.
· The photosensitive drum is soiled (e.g.,
cleaning fault).
Timing of detection
xx24 At time of setting initial
data (as during
installation), the result of
averaging five retry
samplings of PT-SIG-M/
C/Y levels is '683' or less
or that of PT-SIG-K
levels is '305' or less.
xx30 At time of setting initial
data (as during
installation), the result of
averaging samplings of
SGNL-M/C/Y levels is
'859' or more.
xx31 At time of setting initial
data (as during
installation), the result of
averaging samplings of
REF-M/C/Y levels is
'930' or more.
xx32 At time of setting initial
data (as during
installation), the result of
averaging the first
sampling of PT-SIG-M/
C/Y levels is '930' or
more or that of PT-SIG-
K levels is '550' or more.
xx33 At time of setting initial
data (as during
installation), the result of
averaging samplings of
PT-REF-M/C/Y levels is
'859' or more.
xx34 At time of setting initial
data (as during
installation), the result of
averaging five retry
samplings of PT-SIG-M/
C/Y levels is '749' or
more or that of PT-SIG-
K levels is '371' or more.
E020
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