Canon PC740 Service Manual - Page 69
Microprocessor
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I OPERATIONS AND TIMING Figure 3-315 shows the circuit that controls the foregoing three types of bias, and the circuit has the following functions: • turns on and off the transfer roller bias. • controls the transfer bias to a constant voltage. • corrects the voltage level of the transfer bias (ATVC) - switches the polarity of the DC bias (cleaning). Transfer Photosensitive charging drum roller former 1302 +24V tl Voltage77-/control circuit Trans ormer T 0 Positive bias control circuit A 0 ciliation circuit 0 Transformer/ rectifier circuit Constant current control circuit Current detection - circuit Ca Io-n "c7r er DC bias sian .6"" C.) O >0 w 0 IC-C o0n1 0. (15 uc ) C EIL c 1- 0 I- Pulse/DC cone sion circuit o or >cc u) 2 -(S C Microprocessor Current limiter circuit a Composite power supply PCB U 0 0 -2 Oo "1-7, O E 1P-2 C0..00.1,.E Microprocessor DC control PCB Figure 3-315 COPYRIGHT © 1994 CANONINC. CANON PC72017401T50/770 REV.0 AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON) 3 - 29