Canon 1000 Service Manual page 736

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Code
Back-up data (DC controller PCB;
error)
Be sure to execute RAM clear, and
enter the value recorded on the
service label.
(Or, initial settings may be missing.)
E020
• SALT sensor (fault)
• SALT sensor (faulty)
• Stirring (developer inside devel-
oping assembly; faulty)
• Stray light (to sensor; no cover,
front cover open)
• Photosensitive drum (deteriora-
tion)
• SALT sensor (dirt on window,
damage)
• Photosensitive drum (dirt; clean-
ing failure)
7-300
COPYRIGHT © 2001 CANON INC.
Cause
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Description
xx4A During copying sequence, the average
value after sampling of the following
values is 848 or higher:
SGNL-S-Y, SGNL-S-C is 848 or
higher; or,
the value of SGNL-S-K is 445 or
higher.
xx4B During copying sequence, the average
value after sampling of the following
values is 848 or higher; or
the value of REF-S-K is 544 or higher.
xx4C During copying sequence, the average
value after sampling of the following
values is 512 or lower:
SGNL-S-Y, SGNL-S-M, SGNL-S-C; or,
the value of SGNL-S-K is 102 or lower.
xx4D During copying sequence, the average
value after sampling of the following
values is 336 or lower:
REF-S-Y, REF-S-M, REF-S-C; or,
the value of REF-S-K is 464 or lower.
xx4F The value of 'SGNL-S-Y/M/C/K', which
has been obtained by averaging
samplings during copying sequence is
1008 or more.
xx50 When setting initial data (upon installa-
tion, for example), the gain cannot be
set (i.e., no change is noted in the
value of SGNL between GAIN: 20H
and GAIN: E0).
0455 An appropriate patch cannot be ob-
tained when setting initial data (e.g., at
time of installation).
xx60 During multiple initial rotation (at
power-on, for example), the window
cleaning correction value is 60% or
lower.
xx70 During multiple initial rotation (at
power-on, for example), the window
cleaning correction value is 140% or
lower.