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.
Summary of Contents for FC22
Page 115: ...FC 22 PREVENTIVE MAINTENANCE 2 8 January 2000 TOSHIBA TEC Front side drive system 47 20 ...
Page 121: ......
Page 235: ...January 2000 TOSHIBA TEC 5 29 FC 22 FIRMWARE UPDATING ...
Page 237: ...FC 22 SERVICE HANDBOOK 6 WIRE HARNESS CONNECTION DIAGRAMS 6 2 DC Wire Harness ...
Page 238: ...FC 22 WIREHARNESS CONNECTION DIAGRAMS 6 3 January 20000 TOSHIBA TEC ...