Toshiba e-STUDIO5540C Service Manual page 293

8.5.2 Uneven pitch and jitter image
<Symptoms>
Original mode Location
All modes Occurs cyclically at
right angles to paper
feeding direction
Cause/Section Step
1
2
3
4
Drum 5
Drum drive 6
A
Fuser belt 7
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
Phenomena
Uneven
pitch
Check item
Test printing (A3/LD)
Are there uneven pitches of
approx. 188.5 mm?
Are there uneven pitches of
approx. 26 mm?
This jittery image occurs in
certain positions from the leading
edge of the paper when the
continuous printing is performed.
This occurs at the position
178.277mm from the edge of the
image when printed in black,
283.382mm in cyan, and 388mm
in magenta.
This jittery image occurs in
certain positions from the leading
edge of the paper on the second
and subsequent pages when
continuous printing is performed.
The position of the jittery image
varies depending on the copying
speed, paper size, and color.
Is there any damage or foreign
matter on the drum surface?.
Is there any dent, damage or
deformation on the gears of the
drum drive unit?
Is there any dent, damage or
deformation in the motor gear
section of the drum drive unit?
Check if the fuser belt is
scratched or deformed.)
Feeding
direction
Measures
Output the built-in
halftone and grid
patterns.
Perform procedures 5,
6 and 7.
Perform procedure A.
Perform procedures 8,
9 and 10
Perform procedures 8
and 11
Clean or replace the
drum.
Replace the drum
drive unit.
Replace the drum
motor.
Replace the fuser belt.
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Fig.8-9
Remarks
For the following
checks
Jittering caused
by the impact of
the paper going
into the 2nd
transfer section.
Jittering caused
by the impact of
the paper
passing through
the registration
roller and 2nd
transfer roller
Replace the
drum first,
because in some
cases, scratches
cannot be
visually checked.