Oki 4M - Manual (Page 18)

2 - 5
Used to generate a logic circuit and a high voltage.
Used to drive the motor and electromagnetic clutch.
Output voltage Application
+5 V
+24 V
Output Application
CH
DB
SB
CB
TR
Voltage
–1.35 KV
–300 V/+300 V
–450 V/ 0 V
+400 V
+500 V ~ +3.5 KV/–750 V
Voltage to be applied to a charge roller.
Voltage to be applied to a developing roller.
Voltage to be applied to a sponge roller.
Voltage to be applied to a cleaning roller.
Voltage to be applied to a transfer roller.
2.2 Power Supply Unit
The power supply unit supplies +5 V and +24 V to the main control board according to 230 VAC
/120 VAC.
The power supply unit also contains a heater drive circuit.
2.3 High-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.
Caution: The TR voltage varies with medium and transfer roller impedance.