Samsung SCX-4200 Series Service Manual page 31

3.2.6.1 HVPS (High Voltage Power Supply)
Transfer High Voltage (THV+)
- Input Voltage : 24 V DC
- Output Voltage : MAX +5.0KV
- Input contrast of the Voltage stability degree : under
Loading contrast :
- Output Voltage Rising Time : 100 ms Max
- Output Voltage Falling Time : 100 ms Max
- Fluctuating transfer voltage with environmental various : +650 V~ 5 KV
- Environment Recognition Control Method : The THV-PWM ACTIVE is transfer active signal. It detects the
esistance by recognizing the voltage value, F/B, while permits the environmental recognition voltage.
- Output Voltage Control Method : Transfer Output Voltage is outputted and controlled by changing Duty of
THVPWM Signal.
Charge Voltage (MHV)
- Input Voltage : 24 V DC
- Output Voltage : -1.3KV ~ -1.8KV DC
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 30 M
- Output Control Signal(MHV-PWM) : CPU is HV output when PWM is Low
Cleaning Voltage (THV-)
- The (+) Transfer Voltage is not outputted because the THV PWM is controlled with high.
- The (-) Transfer Voltage is outputted because the THV-Enable Signal is controlled with low
- The output fluctuation range is big because there is no Feedback control.
- Input Voltage : 24 V DC
- Output Voltage : -1KV
- Output Voltage Rising Time : 100 ms Max
- Output Voltage Falling Time : 100 ms Max
Developing Voltage (DEV)
- Input Voltage : 24 V DC
- Output Voltage: -200V ~ -600V DC
- Output Voltage Fluctuation range: PWM Control
- Input contrast of the output stability degree :
Loading contrast :
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 10M
- Output Control Signal (BIAS-PWM) : the CPU output is HV output when PWM is low.
Samsung Electronics
15%
5 %,(Duty Variable, no loading )
3 % or less
15%
3%
~ 1000 M
15%
15%
15%
3%
3 % or less
~ 1000 M
3 % (fluctuating input 21.6V~26.4V)
3 % or less
System Overview
Service Manual
3-15