Canon 1000 Service Manual page 129

The following five PCBs are used for supplying high voltage to each high-voltage unit:
1 HVT1
Supplies a DC bias to the transfer blade/internal static eliminating roller.
2 HVT2
Supplies a DC bias to the primary charging system.
3 HVT3
Supplies a DC/AC bias to the developing cylinder.
Supplies a DC bias to the stray toner collection electrode plate.
4 HVT4
Supplies a DC/AC bias to the separation charging unit.
5 HVT5
Supplies a DC bias to the pre-fixing charging unit.
The external static eliminating roller is grounded in relation to the internal static eliminating roller.
For details, see the appropriate pages.
DC bias
Pre-fixing charging
assembly
Transfer belt
External static eliminating roller
COPYRIGHT © 2001 CANON INC.
Pre-exposure lamp
Primary charging assembly
Pre-primary charging assembly
Photosensitive drum
HVT4
HVT5
DC+AC bias
Separation charging assembly
Transfer blade
Internal static eliminating roller
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
HVT2
DC bias
Developing cylinder
Figure 3-502
3. OPERATION AND TIMING
HVT3
DC bias
DC+AC bias
Stray toner collecting
electrode plate
HVT1
DC bias
3-85