Samsung SCX-5530FN/XAZ Service Manual page 45

3.2.15 SMPS & HVPS board
The SMPS supplies DC Power to the System.
It takes 110V/220V and outputs the +5V, +24V to supply the power to the main board. The HVPS board creates the high
voltage of THV/MHV/Supply/Dev and supplies it to the developer part for making best condition to display the image. The
HVPS part takes the 24V and outputs the high voltage for THV/MHV/BIAS, and the outputted high voltage is supplied to
the toner, OPC cartridge, and transfer roller.
1) HVPS (High Voltage Power Supply)
Transfer High Voltage (THV+)
- Input Voltage : 24 V DC
- Output Voltage : MAX +5.0KV
->1.2KV 15% (when cleaning,200
- Output Voltage Trigger : 6.5
- Input contrast of the Voltage stability degree :under
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%
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.
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 : 5 % or less
- 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.
Supply
- Output Voltage : -400 V ~ -800V DC
- Input contrast of the output stability degree : under
Loading contrast : 5 % or less
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 10 M
- Output Control Signal (BIAS-PWM) : the CPU is HV output when PWM is low.
Samsung Electronics
15%
5 %,(Duty Variable, no loading )
)
15%
50V
~ 1000 M
15%
20 V
5 % or less
~ 1000 M
50 V(ZENER using, DEV )
~ 1000 M
5 % (fluctuating input 21.6V 26.4V)
5 %
System Overview
Service Manual
3-27