41309401TH Rev.4
347 /
3)
High-voltage and medium-voltage control
High voltages are activated by IC2(IOGA6) and generated by the high-voltage circuit inside
the power supply unit. The CH (charge) voltage of about -1.30kV is used for the charge
roller. The TR1/TR2 (transfer) voltage of about +3.9kV/-0.75kV is used for the transfer
roller.
Medium voltages are activated by IC2(IOGA6) and generated by the medium-voltage
circuit inside the power supply unit. The SB1/SB2 (toner supply) voltage of about +0V/-
450V is used for the toner supply roller. The DB1/DB2 (developing) voltage of about +265V/
-265V is used for the developing roller. The CB (cleaning) voltage of about +400V/-1.35kV
is used for the cleaning roller.
Figure A.28 (4/4) shows high/medium voltages control.
* Signals used to control the high/medium-voltages are listed below.
Signal Name
CHON
"1": CH is output.
(-1.30kV)
Description
DBON1
"1": + ive polarity voltage of DB/SB is output. (+265V)
DBON2
"1": - ive polarity voltage of DB/SB is output. (-265V)
TRON1
"1": + ive polarity voltage of TR is output.
(+3.9kV)
TRON2
CB1ON
CB2ON
"1": - ive polarity voltage of TR is output.
(-0.75kV)
"1": + ive polarity voltage of CB is output.
(+400V)
"1": - ive polarity voltage of CB is output.
(-1.35kV)
IC2
R46
P2H
Contact assy.
Cleaning roller
Charge roller
EP drum
Transfer roller
Developing roller
Toner supply roller
CH
TR1/TR2
CB
DB1/DB2
SB1/SB2
High-voltage
generation
circuit
Medium-
voltage
generation
circuit
DBON1
DBON2
DBPWM
TR1PWM
CHPWM
TR2PWM
IOGA6
Figure A.28 (4/4) High/Medium Voltage Control
Summary of Contents for OKIFAX4550
Page 156: ...41309401TH Rev 4 156 Figure 4 2 Appearance of the OKIFAX4550 OKIOFFICE87...
Page 428: ...41309401TH Rev 4 428 SECTION 1 CABINET ASSEMBLY OKIFAX4550 OKIOFFICE87...
Page 431: ...41309401TH Rev 4 431 SECTION 2 UNIT PRINTER...
Page 433: ...41309401TH Rev 4 433 SECTION 3 UNIT 051 OPE PANEL...
Page 435: ...41309401TH Rev 4 435 SECTION 4 OPEPANEL OPERATION PANEL ASSEMBLY...
Page 437: ...41309401TH Rev 4 437 SECTION 5 FRAME ASSEMBLY SCANNER L...
Page 439: ...41309401TH Rev 4 439 SECTION 6 PLATE ASSEMBLY SCANNER B...
Page 441: ...41309401TH Rev 4 441 SECTION 7 PLATE ASSEMBLY SCANNER R...
Page 443: ...41309401TH Rev 4 443 SECTION 8 FRAME ASSEMBLY SCANNER U...
Page 445: ...41309401TH Rev 4 445 SECTION 9 COVER ASSEMBLY TOP...
Page 447: ...41309401TH Rev 4 447 SECTION 10 PLATE ASSEMBLY BASE...
Page 449: ...41309401TH Rev 4 449 SECTION 11 PRINTER BASE FRAME UNIT Heat assy...
Page 452: ...41309401TH Rev 4 452 SECTION 12 PRINTER HEAT ASSY...
Page 454: ...41309401TH Rev 4 454 SECTION 13 CABLES...
Page 457: ...41309401TH Rev 4 457 46F PCB Assy 1 9 41196601...
Page 466: ...41309401TH Rev 4 466 R46 PCB Assy 1 10 41033201...
Page 476: ...41309401TH Rev 4 476 04W PCB Assy 1 3 40071401...
Page 479: ...41309401TH Rev 4 479 EN9 PCB Assy 1 6 41144301...
Page 485: ...41309401TH Rev 4 485 INU PCB Assy 41144501 US 1 4 41144502 INT 1 5...
Page 493: ...41309401TH Rev 4 493 MPW1546 120V PCB Assy 1 5 SIPS1303...
Page 498: ...41309401TH Rev 4 498 MPW1446 230V PCB Assy 1 6 SIPS1302...
Page 504: ...41309401TH Rev 4 504 P2H PCB Assy 1 4 40599101...
Page 508: ...41309401TH Rev 4 508 P6L PCB Assy 1 3 40386701...
Page 511: ...41309401TH Rev 4 511 G4N PCB Assy 1 5 41033701...
Page 585: ...41309401TH Rev 4 585 Figure H 7 1 2 RTC Time Read Figure H 7 2 2 RTC Time Set...
Page 587: ...41309401TH Rev 4 587 Figure H 9 Figure H 10 1 3...
Page 588: ...41309401TH Rev 4 588 Figure H 10 2 3 Figure H 10 3 3...
Page 589: ...41309401TH Rev 4 589 Figure H 11 1 3 Figure H 11 2 3...
Page 590: ...41309401TH Rev 4 590 Figure H 12 Figure H 11 3 3...
Page 591: ...41309401TH Rev 4 591 Figure H 13 1 2 Figure H 13 2 2...
Page 592: ...41309401TH Rev 3 592 592 Figure H 14 1 2 Figure H 14 2 2...