OKI OL600E User Manual

                                                                                                                                                
2.3 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

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

(2) High Voltage Power Supply Circuit
This circuit generates following voltages required for electrophotographic process from +5 V, according to 
the control sequence from the 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

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 cleaning 
roller

(3) Photosensor
The photosensor mounted on this power supply board monitors the paper running state during printing.
The sensor layout diagram is shown in Figure 2-3.

OKI OL600/610ex (96-01-18