COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-4
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
Primary charging
(DC bias + AC bias) goes ON.
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.
Primary charging
(DC bias + AC bias) goes ON.
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.
Primary charging
(DC bias + AC bias) goes OFF.
