Power Supply/Sensor Board - Oki OKIPAGE 12i Service Handbook

2.2

Power Supply/Sensor Board

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
(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
CH
DB
SB
TR
CB
(3) Photosensor
The photosensor mounted on this power supply/sensor board monitors the status of paper
being fed through the printer during printing.
+5 V Logic circuit supply voltage
+30 V Motor and fan drive voltage and source voltage for high-voltage supply
+8 V RS-232C line voltage
–8 V RS-232C line voltage and PS board supply voltage
+3.3V LED head supply voltage
Voltage
-1.3 KV
-265 V/+300 V
-500 V/ 0 V
+500 V to +3.5 KV/-1100 V
+400 V/-1350 V
Use
Use
Voltage applied to charging roller
Voltage applied to developing roller
Voltage applied to toner supply roller
Voltage applied to transfer roller
Voltage applied to clearing roller
2 - 4
Remarks
Variable