44043511TH Rev.2
27 /
Oki Data CONFIDENTIAL
2.3 Power Unit
This is a high voltage power unit consisting of high voltage power source circuit and a low
voltage power unit composed of a power unit consists of an AC filter circuit, low voltage power
source circuit and heater drive circuit.
(1) Low Voltage Power Unit
This circuit generates the following voltage.
(2) High Voltage Power Unit
This circuit generates the following voltage that is more powerful than +24V
necessary for the electrophotographic process, according to the control sequence
from the control PCB.
Output Voltage Purpose
+5V (1) PU, Logic Circuit Power Source
+5V (2) LED Head
+5V (3) CU
+24V For Monitor Drive
Output Voltage Purpose Remarks
CH -0.8 to -1.4kV Power to Electrification Roller
DB -100 to -450V/250V Power to Development Roller
SB -300 to -700V Power to Toner Supply Roller
BB Drop from SB Output with Zener Power to Development Roller
TR 0 to 7kV Power to Trasfer Roller
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