Muratec MFX-2550 Field Engineering Manual page 245

Printer section
Section Step Check item
Toner cartridge 1
Drum cartridge 2
3
Circuit boards 4
5
4.5.6 Blank lines
Scanner section
Section Step Check item
Scanner section 1
(Front side)
2
3
Is the developing or bias supply bias
contact terminal dirty or deformed?
Is the charge wire dirty?
Is the grid bias, wire electrode contact
terminal, or drum ground contact
terminal dirty or deformed?
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?
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?
Result Remedy
YES Clean. / Replace.
YES Clean.
YES Clean. / Replace.
NO Reconnect. / Replace harness.
YES 1. Replace toner cartridge.
2. Replace drum cartridge.
3. Replace LPH.
4. Replace LPH connect board.
5. Replace LPH board.
6. Replace main control board.
7. Replace high-voltage power
board.
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.
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