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Samsung Electronics
Service Manual
System Overview
3-16
1) Charger Voltage : Charger
Function: voltage that charges OPC surface up to ?500V~ -800V.
Output voltage: -1.0KV ~ -2.0KV DC 3%
Error type: if the voltage fails to be output to Charger Roll, OPC surface will not be charged, and the toner on the
developer roller will be transferred to OPC Drum, printing black paper.
2) 1st Transfer High Voltage : T1(+)
Function: voltage necessary for transferring toner developed on OPC Drum surface onto ITB.
Output voltage: Max +2.0KV 3%(Duty variable, no load)
ERROR type: if T1(+) output fails, the toner on OPC drum will not be transferred to ITB normally and the image will
be blurred.
3) 2nd Transfer High Voltage : T2(+)
Function: voltage used to transfer the toner primarily transferred on ITB again onto paper.
Output voltage: Max +5.0KV 3%(Duty variable, no load)
ERROR type: if T2(+) output fails, the toner on ITB will not be transferred to paper normally and the image will be
blurred.
4) T2 Cleaning Voltage : Clean : T2(-)
Function: prevent reverse side of paper from being dirtied, by recovering the negatively charged toner remaining at
Transfer Roller and sending it onto ITB.
Output voltage: with no feedback control, output fixed voltage(-1300V +/- 15%)
ERROR type: reverse side of paper will be dirtied.
5) Supplying Voltage : Supply AC+DC(-)
Function: voltage that makes toner to develop on the area exposed by LSU by means of potential difference, output
will be the voltage of AC+DC overlapped form.
Output voltage: AC 600V ~ 2000V p-p +/-1.5%
DC -50V ~ -600V DC +/- 3%
ERROR type: 1. if supply is GND, density will be extremely low.
2. if supply is floating (for insecure terminal contact), density will be down so slightly that it is impossible
to make out with naked eyes.
6) Developing Voltage : Deve AC+DC(-)
Function: voltage that supplies toner to Developing Roller
Output voltage: AC 300V ~ 1700Vp-p 1.5% (supply voltage is connected to ZENER Diode 300V)
DC -50V ~ -600V DC +/- 3%
ERROR type: 1. if Deve is GND, density will be extremely down.
2. if Deve is floating (for insecure terminal contact), density will be extremely down.