Samsung ML-1645

Service Manual
Product spec and feature
2-22
Samsung Electronics
- Environment Condition
. Operating temperature range : 0 40
. Maintaining temperature range : -20 40
. Preserving Humidity Condition : 10% ~ 90% RH
. Operating atmospheric pressure range : 1atm
- EMI Requirement : CISPR ,FCC, CE, MIC,
- Safty Requrement : IEC950 UL1950, CSA950, C-UL,Semko, EK,CB,
CCC(CCIB),GOST, EPA, Power Save
2.2.2.6 HVPS board (High Voltage Power Supply)
The HVPS board 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 outputted high voltage is supplied to the toner, OPC cartridge, and transfer roller.
1) Transfer High Voltage (THV+)
- Input Voltage : 24 V DC ° 15%
- Out Voltage : Max. +1.3KV ° 15% (Cleaning,200 )
- Out Voltage Trigger : 6.5
- Input Voltage Variation : 5 % below(Variation 21.6V°≠26.4V)
Load Variation : % below
- 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 environment sensing
voltage is input and get feed back current, and recalculate it to resistence .
- Control method on transfer output voltage : It is controlled by changing its duty of THVPWM Signal as
follows. 10% Duty : +650V, 90% Duty : +5KV 5%
2) Charge Voltage (MHV)
- Input Voltage : 24 V DC 15%
- Out Voltage : -1.3KV ~ 3.2%
- Out Voltage Rising Time : 50 ms Max
- Out Voltage Falling Time : 50 ms Max
- Out Voltage Range : 30 ~ 1000
- Output Control Signal(MHV-PWM) : CPU is HV output when PWM is Low
3) Developing Voltage (DEV)
- IInput Voltage : 24 V DC 15%
- Output Voltage: -350V 4.6%
- Output Voltage Fluctuation range: PWM Control
- Input contrast of the output stability degree : 5 % or less
- Loading contrast : 5 % or less
- Output Voltage Rising Time : 50 ms Max