Canon 1000 Service Manual page 738

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Code
• SALT sensor shutter (fault)
• Developer (deterioration)
• Developing cylinder (rotation
failure)
• Developing assembly (locking
failure)
• Toner density sensor (faulty)
• Developer (inside developing
assembly; stirring failure)
• Toner level sensor (faulty)
E020
7-302
COPYRIGHT © 2001 CANON INC.
Cause
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Description
xx90 Extreme changes have occurred in the
window soiling correction value 10
times or more.
xx91 An error has occurred in the data 10
times or more as a result of window
soiling correction.
xxAA During copying sequence, the variation
in 5 samplings of the following values
is 47 or higher:
SGNL-Y, SGNL-M, SGNL-C
xxAB During copying sequence, the variation
in 5 samplings of the following values
is 47 or higher:
REF-Y, REF-M, REF-C
xxB0 When setting initial data, the average
after sampling of the following values is
859 or higher:
SGNL-Y, SGNL-M, SGNL-C
xxB1 When setting initial data, the average
after sampling of the following values is
859 or higher:
REF-Y, REF-M, REF-C
xxB2 When setting initial data, the average
after sampling of the following values is
255.
SIGG-Y, SIGG-M, SIGG-C
xxB5 When setting initial data, the average
after sampling of the following values is
777 or lower:
SGNL-Y, SGNL-M, SGNL-C
xxB6 When setting initial data, the average
of the following values after sampling is
205 or lower:
REF-Y, REF-M, REF-C
xxB7 When setting initial data, the average
of the following values after sampling is
0:
SIGG-Y, SIGG-M, SIGG-C
xxBA During copying sequence, the average
of the following values after sampling is
1013 or higher:
SGNL-Y, SGNL-M, SGNL-C