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ERROR CODE and TROUBLESHOOTING
8 - 328
8.5.21 Faded image (low density)
Fig.8-30
Cause/Section Step Check item Measures
Laser optical
unit, Main
charger grid
1 Perform the enforced performing of
image quality closed-loop control (05-
2742).
When the enforced performing of
image quality closed-loop control is
performed, the automatic cleaning of
main charger and the LSU slit glass
cleaning are performed at the same
time.
Toner empty
Auto-toner
circuit
2 Is the “ADD TONER” symbol
blinking?
Replace the toner cartridge.
3 Is there enough toner in the
cartridge?
Check the auto-toner circuit function.
4 Is the toner density of developer
material too low?
Toner motor 5 Is the toner motor malfunctioning? Check the motor drive circuit.
Toner cartridge 6 Are there any abnormalities in the
toner cartridge?
Replace the toner cartridge.
Developer
material
7 Has the developer material reached
its PM life?
Replace developer material.
Developer unit 8 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 9 Is the main charger dirty? Clean it or replace the needle
electrode.
Drum 10 Is there film forming on the drum
surface?
Clean or replace the drum.
11 Has the drum reached its PM life? Replace the drum.
Transfer unit 12 Is the transfer belt or the 1st transfers
roller dirty?
Clean the transfer belt and the 1st
transfers roller.
13 Is the 2nd transfer roller reached its
PM life?
Replace the 2nd transfer roller.
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