Power Supply Unit - Oki OKIPAGE18 Maintenance Manual

2.2

Power Supply Unit

The power supply unit 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
+3.8V
(2) High voltage power supply circuit
This circuit generates the following voltages necessary for electro-photographic 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
Sub-CH
CH
DB
SB
TR
CB
(3) Photosensor
The photosensor mounted on this power supply unit supervises the paper running state
during printing.
40931201TH Rev. 4
Logic circuit supply voltage
Motor and fan drive voltage and source voltage for high-voltage supply
Reset circuit, RS232C Line voltage
RS232C Line voltage
LED HEAD supply voltage
Voltage
-15 µA
-1.30 KV
-220 V/+300 V
-450 V
+4 KV/-1.3 kV
+450 V/-1350V
Use
Use
Voltage applied to Sub charging roller
Voltage applied to charging roller
Voltage applied to developing roller
Voltage applied to toner supply roller
Voltage applied to transfer roller
Voltage applied to clearimng roller
Remarks
Variable + Only
20 /