Uneven Pitch And Jitter Image - Toshiba e-STUDIO 2555C Service Manual

8.5.2

Uneven pitch and jitter image

<Symptoms>
Original mode
All modes Occurs cyclically at right
angles to paper feeding
direction
Cause/Section Step
1
Drum 2
3
Drum drive 4
Drum rotation 5
abnormality
Developer 6
sleeve
Inadequate 7
drum TBU
motor rotation
speed
Drum coupling 8
Transfer belt 9
10
11
Transfer belt 12
drive
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Location
Uneven
pitch
Check Item
Test printing (A3/LD)
Are there uneven pitches of
approx. 94 mm?
Is there any damage on the
drum surface?
Is there any dent, damage or
deformation on the gears of
the drum drive unit?
Check the drum TBU motor
operation in the test mode (03)
to see if there is any rotation
abnormality of the drum.
Are there uneven pitches of
approx. 28 mm?
Check the value set for drum
TBU motor rotation speed. (Is
the value significantly different
from the default value?)
Loose coupling, damage,
deformation
Deformation or damage of the
transfer belt
Stain or damage of the drive
roller
Large driving load due to the
peeling of the cleaning blade
Are there uneven pitches of
0.63 mm ?
8 - 279
Phenomena
Feeding
direction
Fig.8-6
Measure
Output the built-in
halftone and grid
patterns.
Replace the drum.
Clean or replace the
drum.
Replace the gears of the
drum drive unit.
Reconnect the
connectors.
Replace the harnesses.
Replace the LGC board.
Replace the drum TBU
motor.
Replace the developer
sleeve.
Reset drum TBU motor
speed to 128.
Replace the couplings.
Replace the transfer
belt.
Clean or replace the
drive roller.
Replace the cleaning
blade.
Replace the TBU gears.
e-STUDIO2555C/3055C/3555C/4555C/5055C
ERROR CODE AND TROUBLESHOOTING
Remark
For the following
checks
Check the
halftone pattern.
(Uneven pitch:
approx. 56 mm)
Check the
halftone pattern.
(Uneven pitch:
approx. 56 mm)
8