Charging Section; Composition; Operation; Charging Control - Konica Minolta Bizhub 501 Service Manual

Theory of Operation Ver.2.0 Mar. 2009

9. CHARGING SECTION

9.1

Composition

Erase lamp (EL)
9.2

Operation

9.2.1

Charging control

A. Charging wire
The high voltage unit (HV) pressurizes 24V DC to impress a minus (–) DC voltage on the charging wire for dis-
charge.
Charging output range: –500 to –1100
B. Charging grid
To obtain a uniform charging wire discharge, a minus (–) high voltage is impressed from the high voltage unit (HV)
to the charging grid.
Charging grid voltage output range: –450 to –1090 V
9.2.2

Erase lamp (EL) control

A. Purpose
To neutralize a residual potential on the drum surface and to obtain a uniform potential on the drum surface, the
erase lamp (EL) is irradiated on the drum before charging.
B. Execution timing
The erase lamp (EL) turns ON in synch with the print start signal turning ON. And it turns OFF a specified period
of time after the fusing exit sensor (PS3) detects the trailing edge of the last paper.
Charging wire
μ
A
9. CHARGING SECTION
Charging control plate
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