Oki OKIPAGE 14i Service Manual page 33

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
+5 V Logic circuit supply voltage.
+30 V Motor and fan drive voltage and source voltage for high-voltage
supply.
+ 12 V Source voltage for high-voltage supply
+ 3.3 V LED head supply 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 Voltage
CH -1.3 KV
DB -265 V/+300 V
SB -500 V/ 0 V
TR +500 V to +3.5 KV/-1100 V
CB +400 V/+3.5 KV
(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 below.
Service Manual for OKIPAGE 14i
Chapter 2 Operation
Application
Application
Voltage to be applied to charge roller.
Voltage to be applied to a developing roller.
Voltage to be applied to a sponge roller.
Voltage to be applied to a transfer roller. (Variable)
Voltage to be applied to a cleaning roller.
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