Toshiba e-studio166 Service Handbook page 197

17)Faded image (low density, abnormal gray balance)
Defective area
Toner empty
Auto-toner circuit
Toner motor
Toner cartridge
Developer material
Developer unit
Main charger
Drum
Transfer charger
High-voltage transformer
Discharge LED
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Fig. 5-17
Step Check items
1 Is "ADD TONER" symbol lit?
2 Is there enough toner in the car-
tridge?
3 Is the toner density in the developer
material too low?
4 Is the toner motor working normally?
5 Is there any problem with the toner
cartridge?
6 Has the developer material reached
its PM life?
7 Is the magnetic brush in proper con-
tact with the drum?
8 Is the developer sleeve pressuriza-
tion mechanism working?
9 Is the main charger dirty?
10 Is "film-forming" occurring on the
drum surface?
11 Has the drum reached its PM life?
12 Is the transfer charger wire cut off?
13 Is the setting for the high-voltage
transformer proper?
14 Are the connectors of the high-volt-
age harness securely connected? Is
the harness open circuited?
15 Are the connectors of discharge LED
harness securely connected?
5 - 37
Prescription
Replace the toner cartridge.
Check the performance of the auto-
toner circuit.
Check the toner motor and the motor
drive.
Replace the toner cartridge.
Replace the developer material.
Check the installation of the devel-
oper unit.
Adjust the doctor-sleeve gap and
polarity.
Check the mechanism.
Clean it or replace the needle elec-
trode and main charger grid.
Clean or replace the drum.
Replace the drum.
Replace the transfer charger wire.
Adjust the output from the high-volt-
age transformer.
Reconnect the harness securely.
Replace the high-voltage harness.
Reconnect the harness securely.
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