Samsung SCX-4216F Service Manual

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Contents

4-14SUMMARY OF PRODUCTSamsung ElectronicsService Manual4.4.1 HVPS(High Voltage Power Supply)1) Transfer High Voltage (THV+)- Function : Voltage to transfer developed toner on OPC drum to a paper.- Output voltage : +1300V DC±20V- 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 toa paper.2) Charge Voltage (MHV)- Function : It is a voltage to charge entire surface of OPC with -900V ~ -1000V.- Output voltage : -1550V DC ± 50V- Error : If MHV doesn't output, a black paper is printed out because toner on developing rollermoves to OPC drum due to the surface of OPC not being charged.3)Cleaning Voltage (THV-)- Function : It removes a dirty on a surface by sending a minus toner in a transfer roller to an OPCdrum to recover toners.- Output Voltage : +300V/-150V- Error : Toner contamination occurs at the backside of a printed-paper.4) Developing Voltage (DEV)- Function: It is a voltage to develop a toner with using a difference of electronic potential on anexposed part by LSU (Laser Scanning Unit).* Generally, the electronic potential of exposed OPC is -180V and exposed developer is -350Vwhen printing, so toner with minus (-) is developed on an exposed part.- Output voltage: -430V DC ± 20V- 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: : -630V DC ± 50V (Use ZENER, DEV Gear)- 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.