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e-STUDIO350/352/353/450/452/453
TROUBLESHOOTING
5 - 125
5
17) Faded image (low density, abnormal gray balance)
Defective area
Step
Check items
Prescription
Toner empty
1
Is “ADD TONER” symbol lit?
Replace the toner cartridge.
Auto-toner circuit
2
Is there enough toner in the car-
tridge?
Check the performance of the auto-toner
circuit.
3
Is the toner density in the developer
material too low?
Toner motor
4
Is the toner motor working normally? Check the motor drive circuit.
Toner cartridge
5
Is there any problem with the toner
cartridge?
Replace the toner cartridge.
Developer material
6
Has the developer material reached
its PM life?
Replace the developer material.
Developer unit
7
Is the magnetic brush in proper con-
tact with the drum?
Check the installation of the developer
unit. Adjust the doctor-sleeve gap and
polarity.
8
Is the developer sleeve pressuriza-
tion mechanism working?
Check the mechanism.
Main charger
9
Is the main charger dirty?
Clean it or replace the charger wire/grid.
Drum
10
Is “film-forming” occurring on the
drum surface?
Clean or replace the drum.
11
Has the drum reached its PM life?
Replace the drum.
Transfer charger
12
Is the transfer charger wire cut off?
Replace the transfer charger wire.
High-voltage trans-
former
13
Is the setting for the high-voltage
transformer proper?
Adjust the output from the high-voltage
transformer.
14
Are the connectors of the high-volt-
age harness securely connected? Is
the harness open circuited?
Reconnect the harness securely. Replace
the high-voltage harness.
Feeding direction