Ac Input Section; High-Voltage Section - Oki OF5600 Service Manual

Page: 227
Service Manual for OF5300/5600
Chapter A Board Descriptions
The power supply unit consists mainly of AC transformer and a power PCB (1VP board for AC120V/2VP
board for AC230V). A block diagram of the power supply unit is shown in Figure A3.6.1 The power PCB is
composed of five main circuits: AC input section, heater control section, low-voltage section, high-voltage
section and protection circuit.
The low-voltage section provides a +5V output by a DC-DC converter and other output voltages (+30V,
+8V and -8V) simply by rectifying and smoothing the respective outputs of the AC transformer. The
high-voltage section (TR1, TR2, DB1, DB2, SB1, SB2, CB and CH) produces a flyback voltage from 5V by
using a drum coil and a high-voltage
transformer.
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