Toshiba e-Studio3511 Service Handbook page 420

(2) Uneven pitch and jitter image
<Symptoms>
Original mode
All modes Occurs cyclically at right
angles to paper feeding
direction
Section Step
1
Drum drive system 2
3
Transfer belt 4
system
5
Laser optical unit 6
e-STUDIO3511/4511 TROUBLESHOOTING
Location Phenomena
Uneven
pitch
Cause
Main Sub
Classification Classification
Drum Surface
condition
Drum rotation Unstable
Main motor Inadequate
rotation speed
Drum coupling Loose coupling
Damage
Deformation
Drive unit Timing belt
Transfer belt Deformation or
damage
Drive roller Slipping
Large driving Cleaning blade
load
Polygonal Surface inclined
mirror
5 - 106
Feeding
direction
Fig. 5-203
Specific
Classification
Output the built-in halftone and grid
patterns on A3/LD.
Check the halftone pattern.
Damage Check the drum surface.
Attached Check the drum surface.
foreign matter
Motor abnormal Check main motor operation in Test
Mode (03).
Control circuit Check main motor operation in Test
abnormal Mode (03).
Adjustment Recheck values set for main motor
error rotation speed.
Check the halftone pattern.
Tension Check the halftone pattern.
looseness
Check the halftone pattern.
Check the condition of transfer belt edge.
Stain Check the halftone pattern.
Check the condition of roller surface.
Peeling
Deformation Check the halftone pattern.
November 2003 © TOSHIBA TEC
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