Canon 1000 Service Manual page 537

e. E020=XX4A, XX4B, XX4C, XX4D, XXBA, XXBB, XXBC, XXBD, XXD0, XXE0
Cause Step
Developing
assembly (un-
even toner
density)
Developer
Color toner
density sensor
SALT sensor
Photosensitive
drum
Developing
cylinder
Toner level
sensor
Hopper
COPYRIGHT © 2001 CANON INC.
Checks
1 Perform "Checking E020" on the next
page. Is 'E020' still indicated?
2 Execute 'STIR-M/C/Y/K' of 'INSTALL'
under 'FUNC' in service mode for the
color in question. Is the problem
corrected?
3 Replace the developer of the color
for which 'E020' is indicated, and
execute 'INIT' of 'INSTALL' under
'FUNC'. Is the problem corrected?
4 Is 'E020' for the SALT sensor?
Detailed code XXXX
↑ − Numeral: SALT
5 Replace the toner density sensor of
the color for which 'E020' is indi-
cated. Is the problem corrected?
6 Replace the SALT sensor. Is the
problem corrected?
7 Replace the photosensitive drum. Is
the problem corrected?
8 Does the developing cylinder of the
color for which 'E020' is indicated
rotating?
9 Is toner present inside the hopper?
(Is the level of toner inside the
hopper for which 'E020' is indicated
above the toner sensor?)
10 Replace the toner level sensor. Is the
problem corrected? (To supply toner,
follow the instructions on p. 7-22.)
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Yes/No
sensor
Alphabet: toner
density sensor
Action
NO End.
YES End.
YES End.
• Check the counter. If
the developers of other
colors are near the
ends of their lives,
replace all developers.
YES Go to step 6.
YES End.
NO Go to step 8.
YES End.
NO Go to the next step.
YES End.
NO Check the developing
cylinder drive system.
NO Check the toner level
sensor inside the hopper.
YES End.
NO Replace the hopper. (To
supply toner, see p. 7-22.)
7-101