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C. High-Voltage Power Supply
1. Outline
In response lo an instruction from the microprocessor (MPU) on the DC controller PCF3, the
high-voltage power supply applies a voltage comprising the DC voltage and the AC voltage to
the
roller and developing cylinder and applies the positive or negalive DC
primaly charging
voltage lo the transfer charging roller.
+24V
t
J401-63
J401-B4
J401-B5
GND
J401-81
J401-52
J401-Al
J401-AZ
HVRST
J401-A4
J401 -A3
TVIN
J401 -AE
/
ANT
J402-1
GND
/
J402-2
,REF +
J402-3
2.
Principle of operation
a.
Primary charging roller voltage
generation
When the /PRNT signal from the video
controller becomes I". initial rotation
slarts, the HVT RESET signal (HVRST]
becomes "H", and the circuit outputs
lhe primaxy AC voltage to the primary
charging roller. When the PRIMARY DC
VOLTAGE ON signal is output to this
._..._......
L
I
Figure 2-29
circuit via the serial line, lhe high-
voltage power supply outputs the
primary DC voltage, and the primary
voltage comprising the AC bias and DC
bias is applied to the primary charging
roller.
The primary DC bias changes with
the development DC bias according to
the image density data senl from the
DC controller via the serial line.
CHAPTER 2
Primary
2 - 23
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