Canon 1000 Service Manual page 734

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Code
The descriptions are by detail code.
E020
• SALT sensor (faulty)
• Stirring (developer inside devel-
oping assembly; faulty)
• Stray light (to sensor; no cover,
front cover open)
• Photosensitive drum (deteriora-
tion)
7-298
COPYRIGHT © 2001 CANON INC.
Cause
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Description
Toner Density Fault
xx represents the color for the developing
assembly.
xx=01: Y
xx=02: M
xx=03: C
xx=04: Bk
The notations in the descriptions are as
follows:
SGNL, toner density signal; REF, reference
signal.
xx3A The variation of the following is 47 or
more for 5 samplings of the density
data when sampling during copying
sequence:
SGNL-S-Y, SGNL-S-M, SGNL-S-C,
SGNL-S-K