Oki 4W PLUS, 4M specifications Power supply unit also contains a heater drive circuit

2.2Power Supply Unit

The power supply unit supplies +5 V and +24 V to the main control board according to 230 VAC /120 VAC.

Output voltage	Application
+5 V	Used to generate a logic circuit and a high voltage.
+24 V	Used to drive the motor and electromagnetic clutch.

The power supply unit also contains a heater drive circuit.

2.3High-Voltage Power Supply Board

(1)High-Voltage power supply circuit

The high-voltage power supply circuit generates the following voltages required for the electro-photographic processor from +5 V according to the control sequence from the main control board. When the cover is open, +5 V supply is automatically interrupted to stop high- voltage output.

Output		Voltage	Application
CH	–1.35 KV		Voltage to be applied to a charge roller.
DB	–300 V/+300 V		Voltage to be applied to a developing roller.
SB	–450 V/ 0 V		Voltage to be applied to a sponge roller.
CB	+400	V	Voltage to be applied to a cleaning roller.
TR	+500	V ~ +3.5 KV/–750 V	Voltage to be applied to a transfer roller.

Caution: The TR voltage varies with medium and transfer roller impedance.

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