Oki OKIPAGE 10ex Maintenance Manual page 223

(4) High-voltage power supply circuit
This high-voltage power supply circuit receives the high-voltage generation timing control
command that is transmitted in serial through the power supply interface from the control
section. It decodes this command by LSI (IC2) and outputs high-frequency pulses to the
corresponding high-voltage generating circuits through pins 11, 12, 13, 14 and 15 of LSI
(IC2). It supplies +5V to each high-voltage generating circuit as the source voltage. When
the cover is open, the supply of +5V is interrupted to interrupt all the high-voltage outputs.
The relationship between the high-frequency pulse output pins and the high-voltage outputs
is shown in the following table.
Main Control Board
CPU
High-voltage
outputs
High
-frequency
pulse output pins
11
12
13
14
15
40990901TH Rev.1
Power supply interface
SB DB CB
0V +300V
-500V -265V +400V
-1.35kV
Power Supply Circuit
+5V
13
DB
IC2
LSI
15
CB
11
14 TR
12
CH
TR CH
+1.2kV
-1.3kV
TRSEL 3: Hi-Z
TRSEL 5: L
TRSEL 3: L
TRSEL 5: Hi-Z
-1.1kV
Part with slant line: no output
SB
SB
DB
CB
TR
CH
Remarks
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