Samsung MultiXpress K4 Series Service Manual page 434

A3 mono copier
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4. Troubleshooting
Step
Check item
3
The path of Laser beam is blocked.
(Foreign substance is on the LSU window.)
4
OPC is scratched or contaminated in the vertical
direction.
4-199
Action
Clean the LSU window.
Replace Drum unit.
(Refer to 3.2.1.)
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