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FC-210/310 TROUBLESHOOTING 4 - 64 February 2002 © TOSHIBA TEC
Original mode Location Phenomena
All modes Color blurred in outline of Color
white text or illustration deviation
on a colored background
Text mode Outline in black text on a White void
Text/Photo mode colored background
Photo mode Color blurred in outline of Color
Map mode line or text deviation
A B C
A B C
A B C
A B C
A B C
A B C
4.2 Troubleshooting of Image
(1) Color deviation
<Symptoms>
Section Step
Cause
Check Item
Main-Classification Sub-Classification Specific-Classification
1 Output the built-in grid pattern on A3/LD.
Color registration 2 Control error or Check the grid pattern.
control poor optimization
Paper transport 3 Paper transport Low speed Adjustment error Check the grid pattern.
system 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
4 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.
No problem is in normal paper mode, but
in the thick paper 3 mode, deviation
occurs in (Y)MCK order, at the trailing
edge of A3/LD sheet.
Drum drive system 5 Drum rotation Unstable Motor abnormal
Check drum motor operation in the test mode (03).
Control circuit Check drum motor operation in the test
abnormal mode (03).
Drum motor Inadequate Adjustment error Re-check values set for drum motor
rotation speed rotation speed.
Drum coupling Loose coupling Check the grid pattern.
Damage
Deformation
Transfer belt system 6 Transfer belt Deformation or Check the grid pattern.
damage Check the condition of transfer belt edge.
Drive roller Slipping Stain Check the grid pattern.
Check the condition of roller surface.
Large driving Used toner Over capacity Check the grid pattern.
load Cleaning blade Peeling
Laser optical unit 7 Tilt adjustment Adjustment me- Check the grid pattern.
mechanism chanism defect
Reflection mirror Check the grid pattern.
warp
f lens characte- Check the grid pattern.
ristic defect
February 2002 © TOSHIBA TEC 4 - 65 FC-210/310 TROUBLESHOOTING
Criteria Measures
Perform following procedures from 2 and after.
Are the grid lines out of alignment? Forced performing of color registration control
Are the lines of the primary-scanning direction out of alignment and
Readjust registration motor speed. * See P. 4-68.
parallel in order of Y-M-C-K from the exit side in the whole image?
Readjust registration motor speed. * See P. 4-68.
Does the roller surface lack in friction and is it slippery? Replace the registration roller.
Readjust registration motor speed. * See P. 4-68.
Are the lines of the primary-scanning direction out of alignment and
By fine adjustment (a few steps at a time), slacken
parallel in order of Y-M-C-K from the exit side in the latter half of the image?
paper slightly, not tighten it (to a straight line in side
Is paper tightened? view) between the transfer belt and fuser unit.
Is paper tightened? Increase the value of 05-408 (correction of fuser
motor rotation speed for the thick paper 3 mode), by
finely adjusting a few steps at a time.
Troubleshoot the drum drive system.
Troubleshoot the drum drive system.
Is the value significantly different from the default value Reset drum motor speed to 1787.
1787? (The value shifts one step each in connection
with transfer belt speed.)
Tighten the screws.
Replace the couplings.
Replace the couplings.
Is the misalignment of the secondary-scanning direction varied?
Replace the belt (troubleshoot the transfer belt).
Is the belt edge damaged or folded?
Is the misalignment of the primary-scanning direction varied?
Clean it.
Is there any stain?
Is the misalignment of the primary-scanning direction varied?
Troubleshoot the used toner system.
Replace the cleaning blade (troubleshoot the transfebelt).
Are the lines of the primary-scanning direction out of Replace the unit.
alignment at front or rear?
Are the lines of the primary-scanning direction warped? Replace the unit.
Are the lines of the primary-scanning direction warped? Replace the unit.