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FC-22 TROUBLESHOOTING 4 - 56 January 2000 © TOSHIBA TEC
(2) Uneven pitch and blur
<Symptoms>
Feeding
direction
Condition Location Phenomenon
All modes Occurs cyclically at right Uneven pitch
angles to paper feeding
direction
Defect area Step
Cause
Check item
Main-Classification Sub-Classification Specific-Classification
1 Output built-in halftone pattern on A3/LD.
Abnormal paper 2 Paper transport Low speed Adjustment defect Check grid pattern.
transport speed speed in
registration Low speed Registration roller
section aging change
Low speed Registration roller Check condition of registration rubber roller
life worn out surface.
High speed Adjustment defect Check grid pattern.
3 Paper transport High speed Adjustment defect Check pattern.
speed in fuser unit
Feed the paper with the front door open and
check the paper transport between transfer
belt and fuser unit.
Drum drive system 4 Drum Surface condition Check pattern.
Damage Check drum surface.
Attached foreign Check drum surface.
matter
5 Drum rotation Unstable Motor abnormal Run operation check in test mode.
Control circuit Run operation check in test mode.
abnormal
Drum motor Inadequate Adjustment defect Re-check values set for drum motor rotaion
rotation speed speed.
Drum coupling Loose coupling Check pattern.
Damaged
Deformation
Transfer belt system 6 Drive unit Timing belt Tension looseness Check pattern.
7 Transfer belt Deformation or Check pattern.
damage Condition of transfer belt edge.
Drive roller Slipping Stain Check pattern.
Check condition of roller surface.
Large driving load Used toner Over capacity Check pattern.
Cleaning blade Peeling
Laser optical unit 8 Polygonal mirror Surface inclined Deformation Check pattern.