Background Fogging - Toshiba e-STUDIO556 Service Manual

8.4.2

Background fogging

Defective area
Density reproduction
Printer section
Parameter adjustment
value
Scanner
Developer material/Toner/
Photoconductive drum
Main charger output
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Fig. 8-2
Step Check items
1 Check the reproduction of the image
density.
2 Check test print image (04-114).
3 Check the image processing
parameter.
4 Are the original glass (especially
shading position), mirrors and lens
dirty?
5 Using the specified developer
material, toner and photoconductive
drum?
6 Have the developer material and the
photoconductive drum reached their
PM life?
7 Is the storage environment of the
toner cartridge 35°C or less without
dew?
8 Is the setting value proper?
Is the main charger output normal?
8 - 219
Prescription
Adjust the density.
Go to step 4 if there is any problem
on image.
Check the range correction setting
and the adjustment value of the
background peak for range
correction. (Ch.6.4.4, Ch.6.4.5)
If they need to be adjusted, check the
print image in the above circle mark
to adjust the adjustment value of the
background peak for range
correction.
Clean them.
Use the specified developer material,
toner and photoconductive drum.
Replace the developer material and
photoconductive drum.
Use the toner cartridge stored in the
environment within specification.
Replace the high-voltage transformer
with a new one and print out a test
chart.
If any abnormal image appears,
check the harness connection
between the LGC board and the
high-voltage transformer, power
supply and stain on the main charger
wire.
e-STUDIO556/656/756/856(Ver03)
ERROR CODE AND TROUBLESHOOTING
8