Toshiba 353 User Manual

e-STUDIO350/352/353/450/452/453

DRUM RELATED SECTION

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11.3 Output Control Circuits of High-Voltage Transformer

11.3.1 Overview
• Generate the output control voltage Vc of the main charger, transfer/separation charger, transfer

guide bias and developer bias.

• Convert Vc  The current is output linearly.

11.3.2 Description of operations

• Outputs the adjustment value of the main, transfer and separation chargers, developer bias and

transfer guide bias in the NVRAM to the ASIC GA.

↓

• Outputs the control voltage data from the ASIC GA to the D/A converter.

↓

• Converts to the analog data by the D/A converter.

↓

• Outputs the control voltage Vc to the main, transfer and separation chargers, developer bias and

transfer guide bias transformer.

↓

• The main, transfer and separation chargers, developer bias and transfer guide bias transformer gen-

erate output current or voltage which is proportional to the control voltage Vc.

* Adjustment of the control voltage Vc (change of adjustment data) is performed in the adjustment

mode (05).

* The output value of the transfer guide bias is fixed when the high-voltage transformer is shipped

from the factory.

Fig. 11-301

HVT board

IC32

IC38

IC2

NVRAM

LGC board

ASIC

Output

Main/
transfer/
separation/
chargers,
developer
bias and
transfer
guide bias

D/A
converter

Digital
data

Adjustment
value

Analog

04/01