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Service Manual - OKIPAGE20
Chapter 2 Operation Description
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
Use
+5 V
Logic circuit supply voltage
+30 V
Motor and fan drive voltage and source voltage for high-voltage supply
+8 V
Reset circuit, RS232C Line voltage
-8 V
RS232C Line voltage
+3.8V
LED head supply voltage
(2) High Voltage Power Supply Circuit
This circuit generates the following voltages necessary for electrophotographic process from +30 V,
according to the control sequence from the main control board. When cover open state is detected, +30 V
supply is automatically interrupted to stop the supply of all high-voltage outputs.
Output
Voltage
Use
Remarks
Sub-CH
-15 Microline
Voltage applied to Sub charging roller
CH
-1.3 KV
Voltage applied to charging roller
DB
-220V/+300V
Voltage applied to developing roller
SB
-450 V
Voltage applied to toner supply roller
TR
+4 KV/-1.3 kV
Voltage applied to transfer roller
Va only
CB
+450 V/-1350V
Voltage applied to cleaning roller
(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.
Summary of Contents for OKIPAGE 20
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