Smps & Hvps Board - Xerox Phaser 3300 Servce Manual

Theory of Operation
SMPS & HVPS board
2-28
The SMPS supplies DC Power to the System. It takes 110 V/220 V and
outputs the +5 V, +24 V to supply the power to the Control Board.
The HVPS board creates the high voltage of THV/MHV/Supply/Dev and
supplies it to the print cartridge for making best condition to display the image.
The HVPS takes the 24 V and outputs the high voltage for THV/MHV/BIAS,
and the high voltage output 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 ± 15%
Output Voltage: MAX +5.0 KV ± 5%, (Duty Variable, no loading)
-> 1.2 KV ± 15% (when cleaning, 200 ΜΩ)
Output Voltage Trigger: 6.5
Input contrast of the Voltage stability degree: under ± 5% (fluctuating
input 21.6 V - 26.4 V) 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: +650
V, 90% Duty: +5 KV ± 5%
Charge Voltage (MHV)
Input Voltage: 24 V DC ± 15%
Output Voltage: -1.3 KV ~ -1.8 KV DC ± 50 V
Output Voltage Rising Time: 50 ms Max
Output Voltage Falling Time: 50 ms Max
Output Loading range: 30 ΜΩ ~ 1000 ΜΩ
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)
μ
Α
Phaser 3300MFP Service Manual