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TROUBLESHOOTING
5 - 115
5
2) Uneven pitch and jitter image
<Symptoms>
Original mode Location Phenomena
All modes Occurs cyclically at right
angles to paper feeding
direction
Uneven pitch
Fig. 5-2
Cause/Section Step Check Item Measure Remark
1 Test printing (A3/LD) Output the built-in halftone
and grid patterns.
For the following
checks
Drum 2 Are there uneven pitches approx.
283 mm?
Replace the main motor.
3 Is there any damage on the drum
surface?
Clean or replace the
drum.
Drum rotation
abnormality
4 Check the main motor operation in
the test mode (03) to see if there is
any rotation abnormality of the drum.
Replace the main motor.
5 Check the main motor operation in
the test mode (03) to see if there is
any rotation abnormality of the drum.
Reconnect the connec-
tors.
Replace the harnesses.
Replace the LGC board.
Inadequate
main motor
rotation speed
6 Check the value set for main motor
rotation speed. (Is the value signifi-
cantly different from the default
value?)
Reset main motor speed
to 128.
Drum coupling 7 Loose coupling, damage, deforma-
tion
Tighten the screws if they
loosen. Or replace the
couplings.
Transfer belt 8 Is the belt tension of the driving unit
normal?
Adjust the tension of the
transfer belt.
Check the halftone
pattern.
(Uneven pitch:
approx. 2.5 mm)
9 Deformation or damage of the trans-
fer belt
Replace the transfer belt. Check the halftone
pattern.
(Uneven pitch:
approx. 75 mm)
10 Stain or damage of the drive roller Clean or replace the drive
roller.
Check the halftone
pattern.
(Uneven pitch:
approx. 75 mm)
11 Large driving load due to the peeling
of the cleaning blade
Replace the cleaning
blade.
Laser optical
unit
12 Check the halftone pattern to see if
there are uneven pitches of approx.
0.3 mm each in the whole image.
Replace the laser optical
unit.
Check the halftone
pattern.
(Uneven pitch:
approx. 0.3 mm)
Feeding
direction
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