Muratec MFX-2550 Field Engineering Manual page 253

4.5.12 Periodically uneven image
Scanner section
Section Step Check item
Scanner section 1
2
3
4
5
6
7
8
Printer section
Section Step Check item
Toner cartridge 1
Drum cartridge 2
Paper path 3
Fusing unit 4
5
Is the FBS motor drive gear cracked
or dirty with foreign object?
Is the scanner motor secured
properly?
Is the carriage adjusting part secured
properly?
Is the carriage secured properly to
the belt?
Are the FBS belt attached loosely?
Are the scanner rails damaged or
dirty with foreign object?
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?
Is the toner cartridge driven properly?
Are the drum and transfer roller
driven properly?
Is the resist roller driven properly?
Is the fusing unit driven properly?
Is the trouble settled with above
steps?
Result Remedy
YES Clean. / Replace.
NO Secure properly.
NO Secure properly.
NO Secure properly.
YES Adjust the belt tension.
YES Clean. / Replace.
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
Correct. / Replace drive
NO
coupling mechanism of toner
cartridge and machine.
Replace toner cartridge.
Correct. / Replace drive
NO
coupling mechanism of drum
cartridge and machine.
Replace drive coupling
mechanism of transfer roller
and machine.
Correct. / Replace drive
NO
coupling mechanism.
Correct. / Replace drive
NO
coupling mechanism.
NO 1. Replace drum cartridge.
2. Replace fusing unit.
3. Replace transfer roller unit.
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