Muratec MFX-2550 Field Engineering Manual page 250

Section Step Check item
Scanner section 1
(Back side)
2
3
Printer section
Section Step Check item
Paper path 1
Drum cartridge 2
3
Fusing unit 4
Toner cartridge 5
Circuit boards 6
7
Are the mirrors, lens, DADF glass
and document glass dirty?
Do the connection from CCD 
R-Scanner board  RADF board
Main control board  LPH board
 LPH connect board  LED unit
remain intact?
Is the trouble settled with above
steps?
Is paper path dirty with toner?
Is there any cleaning trouble?
Is the drum dirty or damaged?
Is the fusing roller or separation
scraper dirty or damaged?
Is the developing roller dirty or dam-
aged?
Are the connections from LPH to
high-voltage board, and from high-
voltage board to main control board
in good condition?
(Check plugs firmly plugged and
snapped harness)
Is the trouble settled with above
steps?
Result Remedy
YES Clean.
If the trouble is not settled
by cleaning, adjust the
background level.
NO Reconnect / Replace harness
NO 1. Replace R-Scanner board.
2. Replace RADF board.
3. Replace main control board.
4. Replace LPH board.
5. Replace LPH connect board.
6. Replace LPH.
Result Remedy
YES Clean.
YES Replace.
YES Replace.
YES Clean. / Replace.
YES Replace.
NO Reconnect. / Replace harness.
NO 1. Replace drum cartridge.
2. Replace fusing unit.
3. Replace toner cartridge.
4. Replace LPH.
5. Replace LPH connect board.
6. Replace LPH board.
7. Replace main control board.
8. Replace high-voltage power
board.
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