Muratec MFX-2550 Field Engineering Manual page 243

Section Step Check item
Scanner section 1
(Back side)
2
3
4
Printer section
Section Step Check item
LPH 1
Toner cartridge 2
Drum cartridge 3
Transfer section 4
5
Circuit boards 6
Toner sensor 7
error
8
Is the DADF glass dirty?
Are the mirrors and lens 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 lens dirty?
Is the developing bias or supply bias
contact terminal dirty or deformed?
Is the grid bias, wire electrode contact
terminal, or drum ground contact
terminal dirty or deformed?
Is the transfer bias contact terminal
dirty or deformed?
Is the transfer roller gap dirty?
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 toner sensor working?
(Use "Sensor input test mode" and
check that the sensor is working.)
Is the trouble settled with above
steps?
Result Remedy
YES Clean the part, and adjust the
background level.
YES Clean or replace the parts, and
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 Clean. / Replace.
YES Clean. / Replace.
YES Clean. / Replace.
YES Clean. / Replace.
NO Reconnect. / Replace the
harness.
NO Reconnect. / Replace sensor.
NO 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.
8. Replace transfer roller unit.
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