Samsung ML-4551NR - Page 34

Summary of Product
Service Manual
3-17
Samsung Electronics
3.3.2.1 HVPS (High Voltage Power Supply)
• Transfer High Voltage (THV+)
- Input Voltage : 24 V DC
15%
- Output Voltage : MAX +5.0KV
5 %,(Duty Variable, no loading )
-1.2KV
15% (when cleaning, 200 )
- Output Voltage Trigger : 6.5
- Input contrast of the Voltage stability degree :under 5 % (fluctuating input 21.6V ~ 26.4V)
Loading contrast :
5 % or less
- Output Voltage Rising Time : 100 ms Max
- Output Voltage Falling Time : 100 ms Max
- Fluctuating transfer voltage with environmental various : +650 V(Duty 10%) ~ 5 KV (Duty 90%)
- Environment Recognition Control Method : The THV-PWM ACTIVE is transfer active signal. It detects the resistance
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. 10% Duty : +650V, 90%
Duty : +5KV
5%
Fuser Voltage
- Input Voltage : 24 V DC
15%
- Output Voltage : 30V~1000V DC
30V
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 30 M
~ 1000 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.
Developing Voltage (DEV)
- Input Voltage : 24 V DC
15%
- Output Voltage: -200V ~ -600V DC
20V
- Output Voltage Fluctuation range: PWM Control
- Input contrast of the output stability degree :
5 % or less
Loading contrast :
5 % or less
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 10M
~ 1000 M
- Output Control Signal (BIAS-PWM) : the CPU output is HV output when PWM is low.
Supply
- Output Voltage : -400V~ -800V DC
50V(ZENER using, DEV )
- Input contrast of the output stability degree : under
5 %
Loading contrast :
5 % or less
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 10 M
~ 1000 M
- Output Control Signal (BIAS-PWM) : the CPU is HV output when PWM is low.