PWU
40838301TH Rev.1
A3 - 31
5-6
High-voltage section
5-6-1 Functional overview
The high-voltage outputs consist of TR1 (3.5 kV), TR2 (-0.75 kV), DB1 (+300 V), DB2 (-300 V), SB2
(-450V), CB (+400 V) and CH (-1.35 kV) and are obtained as follows. The control signal obtained
from CPU of E17 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/-450 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.
+300 V/-300 V
+3.5 kV/-0.75 kV
-1.35 kV
+400 V
Application
DB1/DB2
TR1/TR2
CH
CB
5-6-2 SB2, DB1, DB2 and CB
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.
5-6-3 TR1 and TR2
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.
5-6-4 CH
1)
The CH output voltage is stabilized by keeping the primary flyback voltage obtained
by switching operation of Q16 at a constant voltage by D76 and D82.
Summary of Contents for OKIFAX 5400
Page 7: ...40838301TH Rev 1 CHAPTER 1 GENERAL INFORMATION...
Page 46: ...40838301TH Rev 1 CHAPTER 2 INSTALLATION PROCEDURE...
Page 130: ...40838301TH Rev 1 CHAPTER 3 BRIEF TECHNICAL DESCRIPTION...
Page 138: ...40838301TH Rev 1 CHAPTER 4 MECHANICAL DISASSEMBLY AND REASSEMBLY...
Page 157: ...40838301TH Rev 1 CHAPTER 5 ADJUSTMENTS...
Page 162: ...40838301TH Rev 1 CHAPTER 6 CLEANING AND MAINTENANCE...
Page 189: ...40838301TH Rev 1 CHAPTER 7 TROUBLESHOOTING AND REPAIR FOR OKIFAX 5400...
Page 240: ...40838301TH Rev 1 CHAPTER 8 DIPSWITCHS SETTING TABLES...
Page 380: ...40838301TH Rev 1 D 2 SECTION 1 CABINET ASSEMBLY 5...
Page 382: ...40838301TH Rev 1 D 4 SECTION 2 CONTROL PANEL ASSEMBLY...
Page 384: ...40838301TH Rev 1 D 6 SECTION 3 PRINTER ASSEMBLY 51...
Page 387: ...40838301TH Rev 1 D 9 SECTION 4 BASE ASSEMBLY 30 37 36 39 40 5...
Page 390: ...40838301TH Rev 1 D 12 SECTION 5 SCAN UNIT...
Page 392: ...40838301TH Rev 1 D 14 SECTION 6 PAPER GUIDE U ASSEMBLY...
Page 394: ...40838301TH Rev 1 D 16 SECTION 7 CABLES 10 11 19 12 20 21...
Page 396: ...40838301TH Rev 1 D 18 SECTION 8 OPTION TELEPHONE US...
Page 399: ...40838301TH Rev 1 D 21 SECTION 8 OPTION TELEPHONE UK ITA NOR DEN BEL...
Page 402: ...40838301TH Rev 1 D 24 SECTION 8 OPTION TELEPHONE HOL GER FRA SWITZ AUT INT L...