Toshiba 4560 Service Manual page 132

9.5 Charging, Transfer, Separation, Developer Bias Control Circuit
9.5.1 Outline
• Circuit to create the output control voltage Vc of the charging/transfer/separation/developer bias.
• Vc is varied
9.5.2 Operation explanation
Adjustment
BC-RAM
value
IC37
• Charging/transfer/separation/developer bias output adjustment value inside BC-RAM is output
to the main processor.
• Outputs control voltage data from the main processor to the D/A converter.
• Analog conversion by the D/A converter.
• Outputs control voltage Vc to the charging/transfer/separation/developer-bias transformer.
• Charging/transfer/separation/developer-bias transformer generates an output current or voltage
proportional to control the voltage Vc.
* Adjustment of control voltage Vc (adjustment data change) is performed in the AJ mode.
4560/4570 DRUM
output current or voltage varies linearly.
Main
processor
Digital
data
IC35
Analog
Vc
D/A
converter
IC46
9 - 18
Changing/
transfer/
separation/
Output
developer
bias output
High-voltage
transformer
Nov. 1997 © TOSHIBA