OKIDATA Okipage6e, Service Manual

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Service Guide OKIPAGE6e
Chapter 2 Operation Description
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.
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
High Voltage Power Supply Circuit
This circuit generates following voltages required for electrophotographic process from +5 V, according to the control seque
interrupted automatically to stop the supply of all high-voltage outputs.
Output Voltage Use Remarks
CH -1.35 KV Voltage applied to charging roller
DB -300 V/+300 V Voltage applied to developing
roller
SB -450 V/ 0 V Voltage applied to toner supply
roller
TR +500 V to +4 KV/-750 V Voltage applied to transfer roller Variable
CB +400 V Voltage applied to clearing roller
Photosensor
The photosensor mounted on this power supply board monitors the paper running state during printing.
Sensor Layout Diagram (Figure 2-3)