Canon 1130 Service Manual page 923

CHAPTER 13 TROUBLESHOOTING
Code
E020
13-334
COPYRIGHT © 2002 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 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).
CANON CLC1100/1130/1150/1160/1180 REV.2 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
Timing of detection
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.
xx35 At time of initial data
setting (as upon
installation), the value
after sampling and
averaging of the
following is '800' or
higher:
ADJUST>DENS>P-
SENS-Y/M/C/K.