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January 2000 © TOSHIBA TEC 4 - 77 FC-22 TROUBLESHOOTING
Cause/Defect area
Step
Check items Measures
—
Registration roller
Transfer belt
Fuser roller
Drum
Carriage operation
Scanner
Drum drive system
EPU load
0 Toner image proper on drum?
1 Registration roller rotation defective?
2 Transfer belt malfunctioning?
3 Fuser roller rotation defective?
4 Large scratch on drum?
5 Slider sheet defective?
6 Any abnormalities on carriage feet?
7 Tension of timing belt inappropriate?
8 Carriage drive system malfunctioning?
9 Mirror loosely mounted?
10 Drum drive system malfunctioning?
11 EPU load too high?
If proper, perform step 1 to 3; otherwise perform step
4 and after.
Check registration roller section and its springs.
Check drive system and replace transfer belt if nec-
essary.
Check fuser roller drive system.
Replace rollers if necessary.
Replace drum.
Replace it.
Replace feet.
Adjust tension.
Check carriage drive system.
Fix it properly.
Check drum drive system.
Clean or replace belt, pulley, bushing if they have
dirt or scratches.
Check EPU.
(21) Image jittering
Feeding direction