Power Supply/Sensor Board - OKIDATA OL810e Service Manual

2.2 Power Supply/Sensor Boar
The power supply/sensor 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
+5 V
+30 V
+8 V
+8 V
+3.3V
(2) High Voltage Power Supply Circuit
This circuit generates the following voltages required for electrophotographic process from +5 V,
according to the control sequence from the main 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 Voltage applied to transfer roller Variable
CB +400 V
(3) Photosensor
The photosensor mounted on this power supply/sensor board monitors the status of paper being fed
through the printer during printing.
The sensor layout diagram is shown in Figure 2-2.
Use
Logic circuit supply voltage
Motor and fan drive voltage and source voltage for high-voltage supply
RS-232C line voltage
RS-232C line voltage and PS board supply voltage
LED head supply voltage
Use
Voltage applied to charging roller
Voltage applied to developing roller
Voltage applied to toner supply roller
Voltage applied to clearing roller
Service Guide OL810e
Chapter 2 Operation Description
Remarks
Page: 11