Canon GP605 Service Manual page 596

1 Checking the Printer Side (2/2)
<Checking for Fogging>
A
Check PG6 (blank)
Is the copy foggy?
YES
Select COPIER>DISPLAY>DPOT>VDM
in service mode.
Is the
reading of VDM
between 432 and
452?
YES
Select COPIER>DISPLAY>DPOT>VL1M
in service mode.
Is the
reading of VL1M
between 62 and
82?
YES
Decrease the setting of
ADJUST>DEVELOP>DE-OFST.
· A lower setting decreases the
density.
13-4
NO
Check the potential
NO
controller system; if
normal, replace the
photosensitive drum.
Check the following;
if faulty, replace the
appropriate part:
NO
[1] Laser output
[2] Potential control
system
<Checking Halftone Density>
Check PG4 (halftone)
Is the
density
NO
appreciably low (lighter)
End.
compared to the density of No.
3 (halftone) of the Test
Chart?
YES
Increase the setting of
ADJUST>DEVELOP>DE-OFST
in service mode.
COPYRIGHT © 1999 CANON INC. CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)