Toshiba e-STUDIO 2555C Service Manual page 750

[CE40] Image quality control test pattern abnormality
Classification
Image control related service call
Step Check Item
Check if there is any abnormality
on the hand grips and rods of the
1
main charger cleaner. Correct if
there is.
Check if the drum is rotated
properly by turning the coupling of
the developer unit. Correct the
2
auger and the surrounding
hardware if not.
LED head
3
Check if there is any stain on the
4
image quality sensor (Rear).
Check if the sensor shutter is
5
working properly.
Transfer belt
6
Check if any of the springs for
supplying power to the transfer
7
belt unit is deformed. Replace the
spring if it is deformed.
Use "Image quality control
abnormal detection counter Y to K
display/0 clearing (08-2528 to
8
2531)" to check the abnormal
occurring condition for each color.
e-STUDIO2555C/3055C/3555C/4555C/5055C
ERROR CODE AND TROUBLESHOOTING
Image quality control test pattern abnormality: The test pattern
is not formed normally.
Result
• Check the connectors and
harnesses between the LGC board
(CN380, CN381, CN382, CN383,
CN384, CN385, CN386, CN387,
CN592, CN593, CN594, CN595,
CN596, CN597, CN598 and
CN599) and theLED head.
• Check if there is any stain or
scratch on the LED head. Clean or
correct if there is.
Check if the transfer belt is properly
operated. (ON: 03-101 / OFF: 03-151)
If the transfer belt rotates normally,
check if any abnormal stains (cleaning
defects), large scratches or breaking
are on the surface of transfer belt by
making full rotation of transfer belt.
Replace the transfer belt if any.
Check if the transfer belt is loose or
heaving, and correct it if needed.
If the transfer belt is not rotating
normally, check if the drive gears are
damaged or if it contacts the
equipment or if the transfer belt
cleaning unit is normal. Correct it if
needed.
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