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FC-210/310 TROUBLESHOOTING 4 - 66 February 2002 © TOSHIBA TEC
(2) Uneven pitch and jitter image
<Symptoms>
Feeding
direction
Original mode Location Phenomenon
All modes Occurs cyclically at right Uneven pitch
angles to paper feeding
direction
Section Step
Cause
Check item
Main-Classification Sub-Classification Specific-Classification
1 Output the built-in halftone and grid
patterns on A3/LD.
Paper transport 2 Paper transport Low speed Adjustment error Check the grid pattern.
syetem speed in regist-
ration section Low speed Registration roller
aging change
Low speed Registration roller Check the condition of registration
life (worn out) rubber roller surface.
High speed Adjustment error Check the grid pattern.
3 Paper transport High speed Adjustment error Check the grid pattern.
speed in fuser
unit Feed paper with the front door open
and check the paper transport between
the transfer belt and fuser unit.
Drum drive system 4 Drum Surface condition Check the halftone pattern.
Damage Check the drum surface.
Attached foreign Check the drum surface.
matter
5 Drum rotation Unstable Motor abnormal
Check drum motor operation in test mode (03).
Control circuit
Check drum motor operation in test mode (03).
abnormal
Drum motor Inadequate Adjustment error Re-check values set for drum motor
rotation speed rotaion speed.
Drum coupling Loose coupling Check the halftone pattern.
Damage
Deformation
Transfer belt system 6 Drive unit Timing belt Tension looseness Check the halftone pattern.
7 Transfer belt Deformation or Check the halftone pattern.
damage Condition of transfer belt edge.
Drive roller Slipping Stain Check the halftone pattern.
Check the condition of roller surface.
Large driving Used toner Over capacity Check the halftone pattern.
load Cleaning blade Peeling
Laser optical unit 8 Polygonal mirror Surface inclined Deformation Check the halftone pattern.
February 2002 © TOSHIBA TEC 4 - 67 FC-210/310 TROUBLESHOOTING
Criteria Measures
Perform following procedures from 2 and after.
Is there uneven pitch extending 2.5 mm to 3 mm within an area
Readjust registration motor rotation speed. * See P. 4-68.
about 130 mm wide from the leading edge of the image?
Readjust registration motor rotation speed. * See P. 4-68.
Does the roller surface lack in friction and is it slippery? Replace the registration roller.
Readjust registration motor rotation speed. * See P. 4-68.
Is there uneven pitch extending approx. 2.9 mm within an area
By fine adjustment (a few steps at a time), slacken paper
about 150 mm wide from the trailing edge of the image?
slightly, not tighten it (to a straight line in side view)
Is paper tightened? between the transfer belt and fuser unit.
Are there uneven pitches approx. 94 mm in the whole image? Replace the drum.
Is there any damage? Replace the drum.
Is there any attached foreign matter? Clean or replace the drum.
Troubleshoot the drum drive system.
Troubleshoot the drum drive system.
Is the value significantly different from the default value Reset drum motor rotation speed to 1787.
1787? (The value shifts one step each in connection
with transfer belt speed)
Re-fasten the screws.
Replace the couplings.
Replace the couplings.
Are there uneven pitches approx. 2.5 mm in the whole image? Re-fasten the screws to fix the tension arm.
Are there uneven pitches approx. 75 mm in the whole image? Replace the transfer belt (troubleshoot the transfer
Is the belt edge damaged or folded? belt).
Are there uneven pitches approx. 75 mm in the whole image? Clean it.
Is there any stain?
Are there uneven pitches approx. 75 mm in the whole image? Troubleshoot the used toner system.
Replace the cleaning blade (troubleshoot the transfer belt).
Are there uneven pitches approx. 0.3 mm in the whole image? Replace the unit.