Power Supply Board - OKIDATA OL600e Service Manual

%2.3 Power Supply Board

2.3 Power Supply Board
The power supply board consists of an AC filter circuit, a low voltage power supply circuit, a high voltage
power supply circuit, heater drive circuit, and photosensors.
(1) Low Voltage Power Supply Circuit
This circuit generates the following voltages.
Output voltage Use
+5 V Logic circuit supply voltage
+30 V Motor and fan drive voltage and source
voltage for high-voltage supply
+8 V Analog supply voltage
-8 V PS board and analog circuit supply voltage
(2) High Voltage Power Supply Circuit
This circuit generates following voltages required for electrophotographic process from +5 V, according to
the control sequence from the control board. When cover open state is detected, +5 V supply is
interrupted automatically to stop the supply of all high-voltage outputs.
Output Voltage
CH -1.35 KV
DB -300 V/+300 V
SB -450 V/ 0 V
TR +500 V to +4 KV/-750 V
CB +400 V
(3) Photosensor
The photosensor mounted on this power supply board monitors the paper running state during printing.
The sensor layout diagram is shown in Figure 2-3.
OKI OL600/610ex (96-01-18
Use
Voltage applied to charging
roller
Voltage applied to developing
roller
Voltage applied to toner supply
roller
Voltage applied to transfer roller
Voltage applied to cleaning
roller
Remarks
Variable