Samsung CLX-8640 series Service Manual page 426

4. Troubleshooting
6) Uneven pitch and jitter image
Step Section
1 Developer Unit
2
3 Drum Unit
4 LSU
5 Regi roller gear
6 HVPS board
7 Main Drive Unit
8 ITB Unit
9 Transfer Roller Assy
4-267
Check item
1.7mm or 1.2mm or 2.7mm periodic jitter
has occurred.
35mm or 62mm or 43mm periodic jitter or
band has occurred.
94mm periodic jitter has occurred.
0.508mm or 0.65mm periodic jitter has
occurred.
2.5mm periodic jitter has occurred.
Check the connection of the high voltage
supply terminal of the 1st or 2nd transfer
rollers.
After replacing the developer unit or drum
unit, the periodic jitter or band has occurred.
44mm periodic band has occurred.
55~56mm periodic band has occurred.
Result Action
Yes Replace the developer unit.
Yes Replace the developer unit.
Yes Replace the drum unit.
Yes Replace the Laser Scanning Unit
(LSU).
Yes Replace the Regi roller gear.
Yes Replace the HVPS board.
Yes Replace the main drive unit.
Yes Replace the ITB Unit.
Yes Replace the Transfer Roller Assy.
Copyright© 1995-2013 SAMSUNG. All rights reserved.