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AR-651/810 PROCESS SECTION 10 - 4
10. 4. High-voltage Transformer Output Control Circuit
10. 4. 1. General description
The high-voltage transformer output control circuit is a circuit that generates the output control voltage
(Vc) for the main charger (Main), transfer belt power supply roller (Transfer), drum cleaning brush (Brush)
and developer bias (Developer).
It changes the output current linearity by changing the Vc.
10. 4. 2. Operation
PWA-F-LGC-340/341/342
PS-HVT-340
IC27
IC58
IC56
IC18
BC-RAM
Vc
Adjustment
mode
Main CPU
Gate
array
Digital
data
Analog
data
D/A
conerter
•
Each adjustment value of the Main, Transfer and Developer in the BC-RAM is output to the main
CPU.
•
The Vc data is output to the D/A converter from the main CPU.
•
The data is converted into the analog data at the D/A converter.
•
The Vc is output to the Main, Transfer, and Developer transformer.
•
The Main, Transfer, and Developer transformer generate an output current or voltage which is
proportional to the Vc.
* The adjustment of the Vc (changing of the adjusted data) is carried out at the adjustment mode.
* The output value of the drum cleaning brush bias is fixed when the high-voltage transformer is
delivered to the market.
Main
Transfer
Developer
Output
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