Ricoh Aficio SP 5100N, Service Manual

Page: 149 / 175

Engine Hardware Specifications
SM 6-11 G186
Det
ailed
Section
Des
cription
s
driving voltage is calculated with the following formula.
I = Vref / Rs, wherein Vref is (R1x 5V) / (R1+R2).
6.3.4 SMPS & HVPS BOARD
Outputs 5V, 24V to supply the power to the main board and Optional Board (SCF, Duplex)
(Not ADF Board)
HVPS (High Voltage Power Supply)
ƒ
Transfer High Voltage (THV+)
- Input Voltage: 24 V DC 15%
- Output Voltage: MAX +5.0KV 5 %, (Duty Variable, no loading )
-1.2KV 15% (when cleaning, 200)
- Output Voltage Trigger: 6.5
- Input contrast of the Voltage stability degree: under 5 % (fluctuating input 21.6V to
26.4V), 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%) to 5 KV
(Duty 90%)
- Environment Recognition Control Method: The THV-PWM ACTIVE is the transfer
active signal. It detects the resistance by recognizing the voltage value, F/B, while