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TROUBLESHOOTING
5 - 135
5
19)Faded image (low density)
Fig. 5-19
Cause/Section Step Check items Measures
Toner empty
Auto-toner circuit
1 Is the “ADD TONER” symbol blinking? Replace the toner cartridge.
2 Is there enough toner in the cartridge? Check the auto-toner circuit function.
3 Is the toner density of developer material
too low?
Toner motor 4 Is the toner motor malfunctioning? Check the motor drive circuit.
Toner cartridge 5 Are there any abnormalities in the toner
cartridge?
Replace the toner cartridge.
Developer mate-
rial
6 Has the developer material reached its
PM life?
Replace developer material.
Developer unit 7 Is the magnetic brush in proper contact
with the drum?
Check the developer unit installation.
Check the doctor-sleeve gap and pole
position.
Main charger 8 Is the main charger dirty? Clean it or replace the charger wire.
Drum 9 Is there film forming on the drum surface? Clean or replace the drum.
10 Has the drum reached its PM life? Replace the drum.
Transfer unit 11 Has the transfer belt, 1st or 2nd transfer
roller reached its PM life?
Replace the transfer belt, 1st or 2nd trans-
fer roller.
High-voltage
transformer
(developer bias)
12 Is the high-voltage transformer output set-
tings improper?
Adjust the high-voltage transformer out-
put.
13 Are the connector of the high-voltage har-
ness securely connected? Is the harness
open circuited?
Reconnect the harness securely.
Replace the high-voltage harness.
Feeding direction
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