Drum Surface Potential Sensor Control Circuit; General Description; Configuration - Toshiba e-STUDIO520 Service Manual
Multifunctional digital systems
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Also See for e-STUDIO520:
- Service handbook (650 pages) ,
- User functions manual (202 pages) ,
- Network administration manual (124 pages)
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10.5 Drum Surface Potential Sensor Control Circuit
10.5.1
General description
The drum surface potential sensor measures the surface potential of the drum when the drum is
charged. Based on the measured value, this sensor controls the main charger grid bias voltage, and
thus can control the drum surface potential accurately.
10.5.2
Configuration
The configuration of this control circuit is shown below.
•
Drum surface potential sensor:
Measures the drum surface potential.
•
Control section (LGC board):
Calculates the main charger grid bias voltage to be applied when the image quality control is per-
formed, then controls the high-voltage transformer to adjust its bias voltage output.
•
High-voltage transformer:
Generates and supplies the bias voltage of the main charger grid.
Drum surface potential sensor
Main charger grid
Drum
e-STUDIO520/600/720/850 PROCESS RELATED SECTION
High-voltage
Reference voltage: Vctr
transformer
Fig.10-4
10 - 6
LGC board
IC18
Digital data
D/A
converter
IC27
Adjustment value
NVRAM
DRV0-1A
March 2005 © TOSHIBA TEC
IC56
ASIC
IC58
Main CPU
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