User manual

95.08.23.11.29
Color LaserWriter 12/600 PS Basics & Theory 1–65
Voltage to
Transfer Drum
The transfer drum is charged with print bias and between-colors bias
according to each print sequence.
For print bias, positive voltage is applied to the transfer drum in order
to transfer the toner on the photosensitive drum surface onto the paper.
Voltage
Detection
Circuit
Attraction Roller
Voltage Generation
Circuit
Switch
Circuit
Attraction Roller Voltage Generation Circuit
Constant Voltage Circuit
Mechanical Controller Board
High-Voltage Power Supply
IC1003 (High-Voltage Control IC)
/ATRPWM
/HVFre1
/HVATR
/TRPWM
/HVTR
HVFre1
/HVSEPAC0
/HVSEPAC1
HVFre4
Discharge
Roller
Attraction
Roller
Transfer
Drum
Integral Circuit
Switch
Circuit
Transfer Roller
Voltage Generation
Circuit
Voltage
Detection
Circuit
Constant Voltage
Circuit
Transfer Roller Voltage Generation Circuit
Voltage
Conversion
Circuit
Sign Train
Generation
Circuit
Amplification
Circuit
Discharge
Roller
Voltage
Generation
Circuit
Discharge Roller Voltage
Generation Circuit
Current
Detection
Circuit
Current
Detection
Circuit
Current
Detection
Circuit
Short Protective Circuits of Transfer Roller Voltage/
Attraction Voltage/Discharge Roller Voltage
HVFrel 1, 4 are pulse signals