Canon GP605 Service Manual page 187

2. Changing the Primary Charging Level Setting
If uneven images occur, the primary charging level may be changed in service mode to sup-
press the problem.
Standard mode
Suppression mode 1
Suppression mode 2
A higher output suppresses unevenness.
Related Service Mode
COPIER>OPTION>BODY>PR-SEL
(potential unevenness suppression
mode selection)
COPYRIGHT © 1999 CANON INC.
Primary charging current
Setting
correction value (µA)
0
1 +300
2 +600
Table 6-301 Primary Charging Levels
0: standard mode (default)
1: suppression mode 1
2: suppression mode 2
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
VD target value (v)
A lower output suppresses uneven charging
efficiency on the surface of the drum.
Grid bias (V)
600
400
400 550
400
400
6-17