Canon PC420 - Page 63

COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHPTER 4 IMAGE FORMATION SYSTEM
4-5
Primary
charging
roller
Photo-
sensitive
drum
Amplifier
Microprocessor
DC bias
control circuit
Transformer
(T103)
Transformer
(T106)
DC current detection
DC bias high output command (HVPHO)
DC bias ON command (HVPDC) AC bias ON command (HVPAC)
Current detection
J6
DC controller/DC power supply PCB
Oscillation
control circuit
Oscillation
circuit
Figure 4-101C