CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
4-23
3.20 The copy has inadequate sharpness.
Copyboard glass
1) Is there oil or the like on the copyboard glass? Is there foreign matter on
the copyboard glass stay?
YES: Clean the copyboard glass.
Scanner
2) Clean the scanning lamp, reflecting plate, mirrors, and lenses. Is the
problem corrected?
YES: End.
Mirror (position)
3) Is the horizontal reproduction ratio in Direct as indicated?
NO:
Adjust the position of the No. 1 mirror an the No. 2 mirror.
Developing bias
4) Are the connection and the electrical continuity of the high-voltage for
the developing bias normal? (The resistance of the cable for the developing
bias and the resistance between the terminal of the composite power supply
PCB and the terminal on the developing assembly is about 10 k
Ω.)
NO:
Check the connection; and replace the cable. If the problem is still
not corrected,
1.
Replace the composite power supply PCB
2.
Replace the DC controller PCB.
Drum unit, Transfer charging system
5) Try replacing the drum unit. Is the problem corrected?
YES: End.
NO:
Check the transfer charging system.
