Canon GP405 Service Manual page 614

CHAPTER 14 TROUBLESHOOTING
<DPC>
Photosensitive Drum resistance Measurement
Level 3
D-GAMMA Measures the photosensitive drum resistance, and indicates
the result in 0 through 3. This mode is effective when '1' is
set to OPTION>BODY>AGS-NON. It is a mode in which
APVC is forced.
1) Check to make sure that '1' is set to
2) Select <D-GAMMA> to highlight, and press the Copy
A solid black copy is generated, and the screen will
indicate a number.
Use the mode only under the following conditions; do not
rely on this mode unnecessarily:
• To isolate the cause if copy density auto adjustment
• To obtain an idea of the wear of the drum.
• To make adjustments if images show faults after
Photosensitive
medium film pressure
0: The drum is as good as new.
1: The drum will not present a problem.
2: The drum may be replaced. (replace it if possible).
3. The drum must be replaced.
14-196
Description
Operation
OPTION>BODY>AGS-NON.
Start key.
Uses
ends in NG.
replacement of the drum cartridge.
0
Beginning of life
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
1 3
2
End of life
FUNCTION
Ref.