Toshiba e-STUDIO350 Service Handbook page 546

2) Background fogging
Defective area Step
Density reproduc- 1
tion
Background repro- 2
duction
Printer section 3
Scanner 4
Auto-toner 5
6
High-voltage trans- 7
former (Main
charger / Developer
bias)
Developer unit 8
Developer material/ 9
Toner/Drum
10
11
Drum cleaning 12
blade
Toner dusting 13
e-STUDIO350/352/353/450/452/453
TROUBLESHOOTING
Check items
Check the reproduction of the image
density.
Check the background reproduction. Adjust the background.
Check test print image (04-113).
Are the original glass, mirrors and
lens dirty?
Is the auto-toner sensor normal?
Is the toner supplied normally?
Is the high-voltage transformer out-
put defective?
Is the contact between the drum and
developer material normal?
Using the specified developer mate-
rial, toner and drum?
Have the developer material and
drum reached their PM life?
Is the storage environment of the
toner cartridge 35°c less without
dew?
Is the drum cleaned properly?
Is toner heaped on the seal of the
developer unit?
5 - 110
Prescription
Adjust the density.
Go to step 4 if there is any problem on
image.
Clean them.
Check the performance of the auto-toner
sensor and readjust.
Check the motor and circuits.
Adjust the output, or replace the trans-
former.
Adjust the doctor-sleeve gap and polarity.
Use the specified developer material, toner
and drum.
Replace the developer material and drum.
Use the toner cartridge stored in the envi-
ronment within specification.
Check the pressure of the drum cleaning
blade.
Remove the toner and clean the developer
unit.
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