Muratec MFX-2550 Field Engineering Manual page 247

4.5.7 Void areas
Scanner section
Section Step Check item
Scanner section 1
(Front side)
2
3
Section Step Check item
Scanner section 1
(Back side)
2
3
Printer section
Section Step Check item
LED unit 1
Toner cartridge 2
Fusing unit 3
Drum cartridge 4
Circuit boards 5
Are the mirrors, lens, ADF glass and
document glass dirty?
Do the connection from CCD 
Scanner board  Main control board
 LPH board  LPH connect board
 LED unit remain intact?
Is the trouble settled with above
steps?
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 the LED dirty?
Is the toner layer on the developing
roller normal?
Is the fusing roller dirty or damaged?
Is the drum cartridge dirty or
damaged?
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)
Result Remedy
YES Clean.
If the trouble is not settled
by cleaning, adjust the
background level.
NO Reconnect / Replace harness
NO 1. Replace scanner board.
2. Replace main control board.
3. Replace LPH board.
4. Replace LPH connect board.
5. Replace LPH.
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.
NO Replace.
YES Clean. / Replace.
YES Clean. / Replace.
NO Reconnect. / Replace harness.
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