Canon LBP-860, Руководство по обслуживанию

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CHAPTER 2
C. High-Voltage Power Supply
1. Outline
In response an instruction the microprocessor on the DC controller the
high-voltage power supply applies a voltage comprising the DC voltage and the AC voltage to
the
charging
roller and developing cylinder and applies the positive or DC
voltage lo the transfer charging roller.
2.
a.
GND
HVRST
ANT
GND
Figure 2-29
Principle of operation
Primary charging roller voltage
generation
When the signal from the video
controller becomes initial rotation
the HVT signal
becomes and the circuit outputs
AC voltage to the primary
charging roller. When the PRIMARY DC
VOLTAGE ON signal is output to this
Primary
circuit via the serial line, lhe
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
from the
DC controller via the serial line.