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e-STUDIO3511/4511 TROUBLESHOOTING 5 - 128 November 2003 © TOSHIBA TEC
(19) Faded image (low density)
Feeding direction
Cause/Section
Toner empty
Auto-toner circuit
Toner motor
Toner cartridge
Developer material
Developer unit
Main charger
Drum
Transfer unit
High-voltage
transformer
(developer bias)
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
Check items
Is the “ADD TONER” symbol blinking?
Is there enough toner in the cartridge?
Is the toner density of developer
material too low?
Is the toner motor malfunctioning?
Are there any abnormalities in the toner
cartridge?
Has the developer material reached its
PM life?
Is the magnetic brush in proper contact
with the drum?
Is the main charger dirty?
Is there film forming on the drum
surface?
Has the drum reached its PM life?
Has the transfer belt, 1st or 2nd transfer
roller reached its PM life?
Is the high-voltage transformer output
settings improper?
Are the connector of the high-voltage
harness securely connected? Is the
harness open circuited?
Measures
Replace the toner cartridge.
Check the auto-toner circuit function.
Check the motor drive circuit.
Replace the toner cartridge.
Replace developer material.
Check the developer unit installation.
Check the doctor-sleeve gap and pole
position.
Clean it or replace the charger wire.
Clean or replace the drum.
Replace the drum.
Replace the transfer belt, 1st or 2nd
transfer roller.
Adjust the high-voltage transformer
output.
Reconnect the harness securely.
Replace the high-voltage harness.
Fig. 5-220