Uneven Pitch And Blur - Toshiba FC-22 Manual

(2) Uneven pitch and blur

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