Canon CLC 1120 Service Manual page 859

CHAPTER 13 TROUBLESHOOTING
Code
E020
13-332
COPYRIGHT © 1999 CANON INC.
Cause
· 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 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.
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Timing of detection
xx13 At time of setting initial data
(as during installation), the
variation of REF-M/C/Y
levels for ten concentration
data samplings is '70' or more.
xx14 At time of setting initial data
(as during installation), the
variation of PT-SIG-M/C/Y
levels for one concentration
data sampling is '51' or more.
xx15 At time of setting initial data
(as during installation), the
variation of PT-REF-M/C/Y
levels for one concentration
data sampling is '35' or more.
xx16 At time of setting initial data
(as during installation), the
variation of PT-SIG-M/C/Y
levels for 16 concentration
data samplings is '102' or
more.
xx17 At time of setting initial data
(as during installation), the
variation of PT-REF-M/C/Y
levels for 16 concentration
data samplings is '70' or more.
xx20 At time of setting initial data
(as during installation), the
result of averaging samplings
of SGNL-M/C/Y levels is
'777' or less.
xx21 At time of setting initial data
(as during installation), the
result of averaging samplings
of REF-M/C/Y levels is '200'
or less.
xx22 At time of setting initial data
(as during installation), the
result of averaging the first
sampling of PT-SIG-M/C/Y
levels is '650' or less or that of
PT-SIG-K levels is '100' or
less.
xx23 At time of setting initial data
(as during installation), the
result of averaging samplings
of PT-REF-M/C/Y levels is
'777' or less.