Xerox PHASER 3124 Service Manual page 112

General Procedures and Information
HVPS
The HVPS 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 output high voltage is supplied to the toner, OPC cartridge,
and transfer roller.
• Transfer High Voltage (THV+)
Input Voltage : 24 V DC °
Out Voltage : Max. +1.3KV °
Out Voltage Trigger : 6.5µA
Input Voltage Variation :
Out Voltage Rising Time : 100 ms Max
Out Voltage Falling Time : 100 ms Max
Transfer Variation Voltage on Environment Variation : +650 V (Duty 10%) ~ 5KV (Duty
90%)
Control method on environment : THV-PWM ACTIVE, transfer active signal, of environ-
ment sensing voltage is input and get feedback current, and recalculate it to resistance.
Control method on transfer output voltage : It is controlled by changing its duty of
THVPWM signal as follows. 10% Duty : +650V, 90% Duty : +5KV
• Charge Voltage (MHV)
Input Voltage : 24 V DC
Out Voltage : -1.3KV ~
Out Voltage Rising Time : 50 ms Max
Out Voltage Falling Time : 50 ms Max
Out Voltage Range : 30M
Output Control Signal (MHV-PWM) : CPU is HV output when PWM is low
• Developing Voltage (DEV)
Input Voltage : 24 V DC
Output Voltage: -350V
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 : 10Mߟ ~ 1000
Output Control Signal (BIAS-PWM) : the CPU output is HV output when PWM is low.
6-18
15%
±
15% (Cleaning,200 Mega Ohms )
±
5% below (Variation 21.6V~ 26.4V)
±
15%
±
3.2%
±
Ω Ω
~ 1000M
15%
±
4.6%
±
5 % or less
±
5 % or less
±
09/06
5%
±
PHASER 3124 / PHASER 3125