Controlling The Transfer Guide/Fixing Roller Bias - Canon GP215 Service Manual

F. Controlling the Transfer Guide/Fixing Roller Bias
1. Transfer Guide Bias
The transfer guide bias is used to prevent adhesion of toner to the transfer guide and has a negative
potential (–600 VDC) as in the case of toner.
The application continues as long as the control panel power remains ON.
2. Lower Fixing Roller Bias
A positive component is applied to the steel core of the lower fixing roller to prevent offset to the fixing
film.
The terminal on the lower fixing roller shaft is for this purpose; pay attention to the orientation of the
lower roller if you have removed it.
Composite power supply PCB
DC controller PCB
COPYRIGHT © 1996 CANON INC.
T101
T101
drive
circuit
Q605
CPU
J209-A4~A9
J102-A4~A7
IC101
CPU
Figure 3-508
CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATIONS AND TIMING
Fixing Photosensitive
drum
assembly
Transfer
guide
3–69