Xerox Phaser 3250 Service Manual page 82

Phaser 3250 Laser Printer Service Manual
Transfer High Voltage (THV+)
The (+) Transfer High Voltage is supplied to the Transfer Roller for transferring
toner onto the OPC Drum to the paper.
Input Voltage: 24 VDC
Output Voltage:
MAX +5.0KV
-1.2KV
Output Voltage Trigger: 6.5 uA
Input Contrast of the Voltage Stability Degree: Under
input 21.6 V ~ 26.4 V0
Loading Contrast:
Output Voltage Rising Time: 50 ms Max
Output Voltage Falling Time: 100 ms Max
Fluctuating Transfer Voltage with Environmental Various: 0 ~ 5 KV
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 THV/PWM signal.
Charge Voltage (MHV)
The High Voltage is supplied to the OPC Drum through the Charging Roller
while charging the skin of the OPC Drum.
Input Voltage: 24 VDC
Output Voltage: -1.0 KV ~ -1.8 VDC
Output Voltage Riding Time: 50 ms Max
Output Voltage Failing Time: 50 ms Max
Output Loading Range: 30 M
Output Control Signal (MHV-PWM): CPU is HV output when PWM is Low.
±
15%
±
5% (duty variable, no loading)
±
15% (when cleaning, 200 M
±
5% or less
±
15%
Ω
~ 1000 M
Theory of Operation
Ω
)
±
3% (fluctuating
±
3%
Ω
2-19