S U M M A RY OF PRO D U C T
4.5.1 HVPS(High Voltage Power Supply)
1)Transfer High Voltage (THV+)
-Function: It is a voltage to transfer a toner developed on OPC drum to a paper.
-Output voltage: Maximum +5.0KV ±5% (Duty changeable, unload)
-1.0KV ±15%(When cleaning, 200MOhm)
-Error: If THV (+) doesn't output, a ghost status (same character is printed after one cycle (76mm) of OPC) with a low density occurs due to a toner on OPC drum cannot normally transfer to a paper.
2)Charge Voltage (MHV)
-Function: It is a voltage to charge entire surface of OPC with
-Output voltage:
-Error: If MHV doesn't output, a black paper is printed out because toner on developing roller moves to OPC drum due to the surface of OPC is not charged.
3)Cleaning Voltage (THV-)
-Function: It removes a dirty on a surface by sending a minus toner in a transfer roller to an OPC drum to recover toners.
-Output Voltage: There is no feedback control, so change range of output is big up to load.
-Error: Toner contamination occurs at a backside of a
4)Developing Voltage (DEV)
-Function: It is a voltage to develop a toner with using a difference of electronic potential on an exposed part by LSU (Laser Scanning Unit).
*Generally, the electronic potential of exposed OPC is
-Output voltage:
-Error: 1. If DEV is GND, a density is going significantly down.
2.If DEV is floating due to instable contacting point of terminal, and etc., a density is signif- icantly going up.
5)Supply Voltage(SUP)
-Function: It is a voltage to supply toner to a developing roller.
-Output voltage: :
-Error: 1. If SUP is GND, a density is dramatically going down.
2.If SUP is floating due to instable contacting point of terminal, and etc., a density is signif- icantly going down as much as it cannot be recognized with eyes.
Service Manual
Samsung Electronics
