Controlling The Separation Static Eliminator Bias - Canon GP215 Service Manual

3. OPERATIONS AND TIMING
E. Controlling the Separation Static Eliminator Bias
1. Turning ON and OFF the Separation Static Eliminator Bias
The separation static eliminator ON signal (SEBON) causes the CPU (Q605) on the composite power
supply PCB to drive the separation static eliminator bias drive circuit to apply a bias on the separation sta-
tic eliminator.
2. Controlling the Voltage to a Specific Level
The separation static eliminator bias output is returned to the bias drive circuit to control the voltage to
a specific value.
3. Switching the Separation Static Eliminator Bias Voltage
The separation bias differs physically for copying on the first and second side of a two-sided or an over-
lay copy.
To suit differences, the separation static eliminator drive signal 1/2 is used to switch the bias voltage,
ensuring stable separation.
3–68
COPYRIGHT © 1996 CANON INC.
Composite power supply PCB
T101
Separation static
eliminator bias
drive circuit
T101
drive circuit
Q605
CPU
J209-B7
J102-B4
IC101
CPU
DC controller PCB
Figure 3-507
CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
Transformer
(increase)
circuit
J209-A4~A9
J102-A1~A7
Photosensitive
drum
Separation
static eliminator