Toshiba e-STUDIO160 Service Handbook page 194

(14) Faded image (low density, abnormal gray balance)
Step Cause/Defect area
1 Toner empty
2 Transfer charger unit
3
4 Process unit drive system
5 Toner cartridge
6 Process unit (developer)
7 Process unit
(main charger)
8 Process unit (drum)
9 DEV. motor assembly
(terminal)
10 HVPS
11
e-STUDIO160/200/250 TROUBLESHOOTING
Check items
"ADD TONER" symbol flashing?
Transfer charger unit securely in-
stalled?
Transfer charger wire cut off?
Is auger gear of process unit
driven when the PU pulley is
manually rotated clock wise?
Any abnormalities in toner car-
tridge?
Magnetic roller pressure mecha-
nism working normally?
Main charger dirty?
Film formed on drum surface?
Have harnesses been connected
to designated terminals of DEV.
motor assembly correctly?
(Refer to chapter 12.6 of Service
Manual.)
High-voltage output defective?
If problem persists after measures
are applied, or there is no problem
found in above check, follow pro-
cedure described in right column.
4 - 72
Measures
Replace toner cartridge.
Re-install transfer charger unit securely.
Replace transfer charger unit.
Replace process unit.
Replace toner cartridge.
Check mechanism.
Clean main charger wire, replace process unit
or charger wire.
If problem persists, replace process unit or
drum.
Note: Never touch drum surface.
Re-install the harness.
Adjust output from HVPS, or replace defec-
tive HVPS.
Replace process unit or transfer charger unit.
December 2002 TOSHIBA TEC