Toshiba e-STUDIO350 - Output Control Circuits of High-Voltage Transformer; Overview; Description of Operations

November 2003 © TOSHIBA TEC 11 - 5 e-STUDIO350/450 DRUM RELATED SECTON
11
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 trans-
fer guide bias transformer.
↓
• The main, transfer and separation chargers, developer bias and transfer guide bias transformer gener-
ate 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
GA
Vc
Output
Main/
transfer/
separation/
chargres,
developer
bias and
transfer
guide bias
D/A
conveter
Digital
data
Adijustment
value
Analog