Samsung ML-1665 Service Manual - Page 31

■ HVPS Board - cleaning

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Product spec and feature ■ HVPS Board • Transfer High Voltage (THV+) - Input Voltage : 24 V DC ± 15% - Output Voltage : THV+: max +3.5kV ± 10 %,(Duty Variable, no loading ) THV-: -1kV±20% (when cleaning,200 ㏁) - Input contrast of the Voltage stability degree : under ± 3 % (fluctuating input 21.6V~26.4V) Loading contrast : ± 3 % or less - Output Voltage Rising Time : 50 ms Max - Output Voltage Falling Time : 100 ms Max - Fluctuating transfer voltage with environmental various : 0~3.5kV - 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. • Charge Voltage (MHV) - Input Voltage : 24 V DC ± 15% - Output Voltage : -1.0KV ~ -1.8KV DC ± 3% - Output Voltage Rising Time : 50 ms Max - Output Voltage Falling Time : 50 ms Max - Output Loading range : 30 MΩ ~ 1000 MΩ - 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 low. - 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 ~ -500V DC ±3% - Output Voltage Fluctuation range: PWM Control - Input contrast of the output stability degree : ± 3 % or less Loading contrast : ± 3 % or less - Output Voltage Rising Time : 50 ms Max - Output Voltage Falling Time : 50 ms Max - Output Loading range : 10MΩ ~ 1000 MΩ - Output Control Signal (BIAS-PWM) : the CPU output is HV output when PWM is low. • Supply - Output Voltage : -350 V ~ -650V DC ±50 V(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 MΩ ~ 1000 MΩ - Output Control Signal (BIAS-PWM) : the CPU is HV output when PWM is low. Service Manual 2-21 Samsung Electronics

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Product spec and feature
Service Manual
2-21
Samsung Electronics
■ HVPS Board
• Transfer High Voltage (THV+)
- Input Voltage : 24 V DC ± 15%
- Output Voltage : THV+: max +3.5kV ± 10 %,(Duty Variable, no loading )
THV-: -1kV±20% (when cleaning,200
㏁
)
- Input contrast of the Voltage stability degree : under ± 3 % (fluctuating input 21.6V~26.4V)
Loading contrast
: ± 3 %
or less
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 100 ms Max
- Fluctuating transfer voltage with environmental various :
0~3.5kV
- 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.
• Charge Voltage (MHV)
- Input Voltage : 24 V DC ± 15%
- Output Voltage : -1.0KV ~ -1.8KV DC ± 3%
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 30 MΩ ~ 1000 MΩ
- 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 low.
- 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 ~ -500V DC ±3%
- Output Voltage Fluctuation range: PWM Control
- Input contrast of the output stability degree : ± 3 % or less
Loading contrast
: ± 3 % or less
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 10MΩ ~ 1000 MΩ
- Output Control Signal (BIAS-PWM) : the CPU output is HV output when PWM is low.
• Supply
- Output Voltage : -350 V ~ -650V DC ±50 V(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 MΩ ~ 1000 MΩ
- Output Control Signal (BIAS-PWM) : the CPU is HV output when PWM is low.