Power Supply Board - OKIDATA OKIPAGE 16n Service Manual

2.2

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
+5 V
+30 V
+8 V
–8 V
(2) High voltage power supply circuit
This circuit generates the following voltages necessary for electrophotographic processing
from +30 V according to the control sequence from the control board. When cover open state
is detected, +30 V supply is automatically interrupted to stop the supply of all the high-voltage
outputs.
Output
CH -1.30 KV
DB -240 V/+300 V
SB -360 V/450 V
TR +4 KV/-1.3 kV
CB +400 V
(3) Photosensor
The photosensor mounted on this power supply board supervises the paper running state
during printing.
Operation Description
Logic circuit supply voltage
Motor and fan drive voltage and source voltage for high-voltage supply
Reset circuit
Local Talk Line voltage
Voltage
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
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Use
Use
Service Manual, P/N 59274401
Remarks
Variable
OKIPAGE 16n