Toshiba e-STUDIO350 Service Handbook page 561

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