P2H
40672201TH Rev. 4
A3 - 26
1.
High-voltage section
1.1
Functional overview
The high-voltage outputs consist of TR1 (3.9 kV), TR2 (-0.75 kV), DB1 (+265 V), DB2 (-
265 V), SB2 (-550V), CB1 (+400 V), CB2 (-1.35 kV) and CH (-1.30 kV) and are obtained
as follows. The control signal obtained from IOGA4 of R51 board is applied to High-
voltage power supply circuit. As result, the driver current is applied to the drive circuit,
which will provide the high-voltage outputs.
Note:
Signal Name
SB1/SB2
Output Voltage
0
±
5 V/-550 V
Voltage applied to toner supply roller.
Voltage applied to developing roller.
Voltage applied to transfer roller.
Voltage applied to charging roller.
Voltage applied to cleaning roller.
+265 V/-265 V
+3.9 kV/-0.75 kV
-1.30 kV
+400 V
Application
DB1/DB2
TR1/TR2
CH
CB1
Voltage applied to cleaning roller.
P2H
P2H
P2H
P2H
P6L
P6L
-1.35 kV
CB2
1.2
SB2, DB1, DB2 (P2H)
1)
These four high-voltage outputs are obtained from the flyback voltage of Q10.
2)
The positive and negative voltages of DB1 and DB2 are obtained by switching the
charging direction under the triac and thyristor.
3)
Feedback is not applied to these outputs. However, SB2 is limited by D85 and
DB2 is limited by D84 so as not to provide an output exceeding a preset voltage.
1.3
TR1 and TR2 (P2H)
1)
The TR1 high-voltage is obtained by rectifying the secondary output of Q17
switching circuit by a voltage-doubler rectifier.
2)
TR1 output circuit has both constant current (hereinafter called CC) and constant
voltage (hereinafter called CV) modes.
3)
At first, TR1 output circuit operates in the CC mode. Once the voltage determined
by parameters such as roller and medium is obtained, this circuit changes to
operate in the CV mode by the control signal.
4)
The TR2 output voltage is regulated by keeping the voltage obtained by switching
operation of Q15 at a constant voltage by D66 and D65.
1.4
CH (P2H)
1)
The CH output voltage is stabilized by keeping the primary flyback voltage ob-
tained by switching operation of Q16 at a constant voltage by D76 and D82.
1.5
CBI, CB2 (P6L)
1)
The CB1 output voltage is stabilized by keeping the primary flyback voltage
obtained by switching operation of Q2 at a constant voltage by D7 and D6 and D5.
Содержание OKIOFFICE84
Страница 7: ...40672201TH Rev 4 CHAPTER 1 GENERAL INFORMATION...
Страница 44: ...40672201TH Rev 4 CHAPTER 2 INSTALLATION PROCEDURE...
Страница 120: ...40672201TH Rev 4 CHAPTER 3 BRIEF TECHNICAL DESCRIPTION...
Страница 128: ...40672201TH Rev 4 CHAPTER 4 MECHANICAL DISASSEMBLY AND REASSEMBLY...
Страница 133: ...4 5 40672201TH Rev 4 Appearance of the OKIOFFICE84 OKIFAX 4500 FX051 CP4 Fig 01...
Страница 155: ...40672201TH Rev 4 CHAPTER 5 ADJUSTMENTS...
Страница 159: ...40672201TH Rev 4 CHAPTER 6 CLEANING AND MAINTENANCE...
Страница 187: ...40672201TH Rev 4 CHAPTER 7 TROUBLESHOOTING AND REPAIR FOR OKIOFFICE84 OKIFAX 4500...
Страница 232: ...40672201TH Rev 4 CHAPTER 8 DIPSWITCHS SETTING TABLES...
Страница 254: ...40672201TH Rev 4 Appendix A PC Board Descriptions and Operation Second Edition December 1998 Oki Data Corporation...
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Страница 365: ...40672201TH Rev 4 C 34 Low Voltage secondary High Voltage primary...
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Страница 398: ...OKIOFFICE84 OKIFAX 4500 D 7 40672201TH Rev 4 SECTION 3 UNIT 051 OPE PANEL...
Страница 400: ...OKIOFFICE84 OKIFAX 4500 D 9 40672201TH Rev 4 SECTION 4 OPEPANEL OPERATION PANEL ASSEMBLY...
Страница 402: ...OKIOFFICE84 OKIFAX 4500 D 11 40672201TH Rev 4 SECTION 5 FRAME ASSEMBLY SCANNER L...
Страница 404: ...OKIOFFICE84 OKIFAX 4500 D 13 40672201TH Rev 4 SECTION 6 PLATE ASSEMBLY SCANNER B...
Страница 406: ...OKIOFFICE84 OKIFAX 4500 D 15 40672201TH Rev 4 SECTION 7 PLATE ASSEMBLY SCANNER R...
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Страница 410: ...OKIOFFICE84 OKIFAX 4500 D 19 40672201TH Rev 4 SECTION 9 COVER ASSEMBLY TOP...
Страница 412: ...OKIOFFICE84 OKIFAX 4500 D 21 40672201TH Rev 4 SECTION 10 PLATE ASSEMBLY BASE...
Страница 414: ...OKIOFFICE84 OKIFAX 4500 D 23 40672201TH Rev 4 SECTION 11 PRINTER BASE FRAME UNIT Heat assy...
Страница 417: ...OKIOFFICE84 OKIFAX 4500 40672201TH Rev 4 D 26 SECTION 12 PRINTER HEAT ASSY...
Страница 419: ...OKIOFFICE84 OKIFAX 4500 40672201TH Rev 4 D 28 SECTION 13 CABLES...
Страница 421: ...40672201TH Rev 4 Appendix E Boards Layout OKIOFFICE84 OKIFAX 4500 Second Edition December 1998 Oki Data Corporation...
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Страница 435: ...40672201TH Rev 4 Appendix F PC Loading Second Edition December 1998 Oki Data Corporation...
Страница 436: ...40672201TH Rev 4 FX 051 SYSTEM SPECIFICATION PC LOADING PART Ver 00 11 Oki Data Confidential...
Страница 448: ...40672201TH Rev 4 Appendix G RMCS SYSTEM MANUAL For Model 30 Second Edition December 1998 Oki Data Corporation...
Страница 473: ...40672201TH Rev 4 H 18 Figure 2 1 IC16 Pin 77 IC16 Pin 78 IC16 Pin 79 IC16 Pin 80...
Страница 481: ...40672201TH Rev 4 Appendix I FAX2NET FUNCTION First Edition October 1999 Oki Data Corporation...