Canon 1130 Service Manual page 567

[B]
Check the locked condition of the
developing assembly.
Check the value of DISPLAY>
DENS>DENS-Y, DENS-M, DENS-C,
DENS-K in service mode.
Is the density of
black normal?
NO
Is the value of
DENS-K -20 or lower?
NO
Compare the density of a test print
made of Bk halftone against one
made at time of installation or
replacement of the developer.
Is it more or less the same?
NO
Is the surface of
the black toner concentration
sensor soiled?
NO
Is the test print of Bk
mono halftone uneven?
NO
Replace the Bk developer.
13-4
Is the value of
DENS-Y, DENS-M,
DENS-C the specified
value – 20?
NO
YES
Is it -20 or lower?
YES Check the supply of toner NO
from the hopper.
Remove the toner concentration
sensor from inside the developing
assembly.
Is the surface of
the sensor soiled?
Go through the check
YES
items for the developing
NO
assembly.
Replace the developer.
Check Items for the Developing Assembly
YES
Clean the surface of the
1. Is the mechanism used to lock the developing assembly to
sensor.
the photosensitive drum normal?
2. Is the position of the developing assembly normal?
3. Are the developing assembly butting roll and butting block
free of dirt?
4. Are the developing bias AC and DC outputs normal?
5. Is the developing cylinder coated with an even layer of toner?
Further, is the coating thick enough?
6. Is the position of the electrode of the developing cylinder
normal?
If a fault is found after making the above checks, perform
Replace the
YES cleaning or adjustment as necessary.
photosensitive drum and
If fogging or light density still occurs after making all above
developer (all colors).
checks (1 through 6), replace the developing assembly.
Go through the check
YES
items for the developing
assembly.
YES
Check the supply of
toner from the hopper.
Execute FUNCTION>DPC>DPC
in service mode.
YES
Replace the sensor.
Replace the photosensitive drum and
developers (all colors).
COPYRIGHT © 2002 CANON INC.
Correcting Fogging
[A]
NO
To [D] of next page.
Is fogging noted?
YES
NO
Is fogging noted
To [B].
for all colors?
YES
YES
Is the primary charging
Clean.*
assembly soiled?
*Do not clean the grid plate.
NO
Is the value of Check the laser shutter,
NO
DISPLAY>DPOT>V00-500, and adjust the laser
V00-700 normal>? power.
Reference (normal value):
YES
V00-500: 430 to 570
V00-700: 600 to 800
Check the developing assembly.
YES
Correct the fault.
Is there a fault?
NO
CANON CLC1100/1130/1150/1160/1180 REV.1 JAN. 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)