Operations - Canon PC400 Service Manual

CHPTER 4 IMAGE FORMATION SYSTEM

2. Operations

a. HVPDC=1, HVPHO=1 (copying)
DC bias control circuit set to '-625 V'.
Transformer T106 generates 'DC bias'.
HVPAC=1
Oscillation control circuit goes ON.
Transformer T103 generates AC bias
b. HVPDC=1, HVPHO=0 (document not exposed)
DC bias control circuit set to '-240 V'.
Transformer T106 generates DC bias.
HVPAC=1
Oscillation control circuit goes ON.
Transformer T103 generates AC bias.
c. HVPDC=0, HVPHO=0 (standby)
DC bias control circuit goes OFF.
Transformer T106 DC bias goes OFF.
HVPAC=0
Oscillation control circuit goes OFF.
Transformer T103 goes OFF.
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COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Primary charging
(DC bias + AC bias) goes ON.
Primary charging
(DC bias + AC bias) goes ON.
Primary charging
(DC bias + AC bias) goes OFF.