Samsung ML-2552W Spezifikationen PDF herunterladen (Seite 39)

4-20

Summary of Product

Samsung Electronics

Service Manual

4.4.1. HVPS(High Voltage Power Supply)

1) Transfer high voltage (THV (+))

- Function: It is a voltage that transfers toner on an OPC Drum to paper.

- Output voltage: MAX +4.2 KV +/- 5% (Duty is changeable, Not loading)

- 1.7KV +/- 15% (When cleaning, 200MOhm - It transfers toners with (+) polarity of transfer roller to an OPC Drum.

- Error type: IF THV (+) is not outputted, it causes a low density due to toner on an OPC Drum if it is not trans-

ferred to paper. It is possible that over-flow occurs if toner is piled up in a toner vessel continuously.

2) Charge voltage (MHV)

- Function: It is a voltage that charges a surface of OPC to -750V~-900V.

- Output voltage: -1.35KV~1.5KV DC +/- 50V

- Error type: IF MHV is not outputted, toner overflows and reaches to an OPC drum if surface of an OPC is not

charged. A black paper is printed out when it happens.

3) Cleaning voltage: THV (-)

- Function: It removes contamination at a rear by sending (-) polarity in a transfer roller to OPC drum to take toner.

- Output voltage: A change range is large according to a load because there is no feedback control =(-600V~-

1200V)

- Error type: An error due to contamination of toner on a backside of printing paper.

4) Developing voltage (DEV)

- Function: It is a voltage that develops toner with electronic potential difference of the section exposed by LSU

(Laser Scanning Unit).

* When printing, exposing voltage of OPC is -250V and exposing voltage of DEV is -470V. Therefore,

toner with (-) polarity is developed on an exposed section.

- Output voltage: -380V~500DC +/- 20V

- Error type: a) If DEV is GND, a density gets extremely low.

b) When DEV is floating due to instable of terminal’s contacting point, and etc., density gets

extremely high.

5) Supplying voltage (SUP)

- Function: It is a voltage that supplies toner to a developing roller.

- Output voltage: -560V~680V DC +/- 50V (Use AENER, Gearing of DEV - (-)180V more than DEV)

- Error type: a) When SUP is GND, density gets extremely low.

b) If SUP is floating due to instable of terminal’s contacting point, and etc., density gets extreme-

ly low that it is hard to catch up with eyes.

6) OPC Ground ZENER voltage

- Function: It is a voltage to prevent an image contamination under the condition of low temperature and low

humidity environment.

- When a set prints without an output voltage, -100V is maintained on OPC ground. (-100V ZENER diode is con-

nected to OPC ground)

- Error type: a) When ZENER diode is - 0V, there is no serious image problem in general environment, but

in low temperature and low humidity environment, it is possible that a contamination occur

on entire image

b) When ZENER diode is disconnected, a blank page is printed out. (It is the same case as

when a ZENER diode is disconnected to OPC ground.)

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