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FC-22 TROUBLESHOOTING 4 - 54 January 2000 © TOSHIBA TEC
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4.2 Troubleshooting of Image
(1) Color deviation
<Symptoms>
Condition Location Phenomena
All modes White void areas, color blur Color
deviation
Text mode Black text outlines in color White void
Text/Photo mode background
Photo mode Color blur in outline of line Color
Map mode or text deviation
Defect area Step
Cause
Check Item
Main-Classification Sub-Classification Specific-Classification
1 Output build-in grid pattern on A3/LD.
Color registration 2 Control error or Check grid pattern.
Control poor optimization
Abnormal paper 3 Paper transport Low speed Adjustment defect Check grid pattern.
transport speed speed in
registration section Low speed Registration roller
aging change
Low speed Registration roller Check condition of registration rubber roller
life worn out surface.
High speed Adjustment defect Check grid pattern
4 Paper transport High speed Adjustment defect Check grid pattern.
speed in fuser unit
Feed the paper with the front door open and
check the paper transport between transfer
belt and fuser unit.
No defect in normal paper mode, but in thick
paper 3 mode, deviation occurs in order (Y)
MCK, at trailing edge of A3/LD sheet.
Drum drive system 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 rotation
rotation speed speed.
Drum coupling Loose coupling Check grid pattern.
Damage
Deformation
Transfer belt system 6 Transfer belt Deformation or Check grid pattern.
damage Check condition of transfer belt edge
Drive roller Slipping Stain Check grid pattern.
Check condition of roller surface.
Large driving load Used toner Over capacity Check grid pattern.
Cleaning blade Peeling
Laser optical unit 7 Tilt adjustment Adjustment mech- Check grid pattern.
mechanism anism defect
Reflection mirror Check grid pattern.
warp
f
θ
lens characteris- Check grid pattern.
tic defect
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