Samsung ML-2015/XEV manual Hvps board High Voltage Power Supply, Transfer High Voltage THV+

System Overview

- Environment Condition

. Operating temperature range : 040

. 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

3.2.6HVPS 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

Service Manual	3-17
Samsung Electronics