January 2000 © TOSHIBA TEC 4 - 75 FC-22 TROUBLESHOOTING
Cause/Defect area
Step
Check items Measures
Toner empty
Auto-toner circuit
Toner motor
Toner cartridge
Developer material
Developer unit
Main charger
Drum
High-voltage transformer
1 “ADD TONER” symbol flashing?
2 Enough toner in cartridge?
3 Toner density in developer material too
low?
4 Toner motor malfunctioning?
5 Any abnormalities in toner cartridge?
6 Developer material life ended?
7 Magnetic brush in proper contact with
drum?
8 Main charger dirty?
9 Film formed on drum surface?
10 High-voltage transformer settings im-
proper?
Replace toner cartridge.
Check auto-toner circuit function.
Check motor drive circuit.
Replace toner cartridge.
Replace developer material.
Check developer unit installation.
Adjust doctor-sleeve gap and pole position.
Clean it or replace charger wire.
Clean or replace drum.
Adjust high-voltage transformer output.
(19) Faded image (low density, color reproduction defect, gray balance defect)
Feeding direction
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