Canon PC400 Service Manual - Page 62
Transformer T106 DC bias goes OFF., Transformer T103 generates AC bias
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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. 4-4 COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)