Toshiba e-studio 2555c, Руководство по обслуживанию

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ERROR CODE AND TROUBLESHOOTING
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8.5.2 Uneven pitch and jitter image
<Symptoms>
Original mode Location Phenomena
All modes Occurs cyclically at right
angles to paper feeding
direction Uneven
pitch
Fig.8-6
Cause/Section Step Check Item Measure Remark
1 Test printing (A3/LD) Output the built-in
halftone and grid
patterns. For the following
checks
Drum 2 Are there uneven pitches of
approx. 94 mm? Replace the drum.
3 Is there any damage on the
drum surface? Clean or replace the
drum.
Drum drive 4 Is there any dent, damage or
deformation on the gears of
the drum drive unit? Replace the gears of the
drum drive unit.
Drum rotation
abnormality 5 Check the drum TBU motor
operation in the test mode (03)
to see if there is any rotation
abnormality of the drum. Reconnect the
connectors.
Replace the harnesses.
Replace the LGC board.
Replace the drum TBU
motor.
Developer
sleeve 6 Are there uneven pitches of
approx. 28 mm? Replace the developer
sleeve.
Inadequate
drum TBU
motor rotation
speed 7 Check the value set for drum
TBU motor rotation speed. (Is
the value significantly different
from the default value?) Reset drum TBU motor
speed to 128.
Drum coupling 8 Loose coupling, damage,
deformation Replace the couplings.
Transfer belt 9 Deformation or damage of the
transfer belt Replace the transfer
belt. Check the
halftone pattern.
(Uneven pitch:
approx. 56 mm)
10 Stain or damage of the drive
roller Clean or replace the
drive roller. Check the
halftone pattern.
(Uneven pitch:
approx. 56 mm)
11 Large driving load due to the
peeling of the cleaning blade Replace the cleaning
blade.
Transfer belt
drive 12 Are there uneven pitches of
0.63 mm ? Replace the TBU gears.
Feeding
direction