4. High-Voltage Power Supply Circuit
a. Outline
Figure 2-2-4
This circuit is structured with the primary charging bias circuit, developing bias circuit, and
transfer charging bias circuit.
The primary charging bias circuit generates negative AC and DC voltage to apply the com-
bined voltage of these AC and DC to the primary charging roller. It also applies the negative DC
voltage to the fixing film unit through the pressure roller. Also, this circuit detects cartridge
presence.
The developing bias circuit generates negative AC and DC voltage to apply the combined volt-
age to the developing cylinder.
CHAPTER 2
2 - 11
PR1
TRS
DEV
IC201
CPU
DVACC
TRNFOT
TRCRNT
TRPWM
PRACC
PRDCC
IC301
CRGSNS
FB
IC301
IC202
IC301
IC202
Positive voltage
generation circuit
J303
J304
J305
J301
J302
30
/DCPWM
31
43
32
37
36
44
/PRAC
P31/AD1
DEVAC
TRFP
TRFM
P32/AD2
DC voltage
generation
circuit
AC voltage
generation
circuit
DC voltage
generation
circuit
AC voltage
generation
circuit
Combined
Combined
Primary
charging
roller
Developing cylinder
Transfer
charging
roller
Engine controller PCB
Pressure roller
High-voltage power supply circuit
Developing bias circuit
Transfer charging bias circuit
Negative voltage
generation circuit
Photos
ensitive
drum
Fixing
film unit
Primary charging bias circuit
Содержание LASER SHOT LBP-1210
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Страница 191: ...APPENDIX I GENERAL TIMING CHART A 1 II GENERAL CIRCUIT DIAGRAM A 2 III LIST OF SIGNALS A 3 IV MESSAGES TABLE A 5 ...
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