Samsung MultiXpress X4 Series Service Manual page 517

8) Removing debris from the Developer Unit.
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Symptom :
Line occurs on the paper moving direction.
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Cause :
Debris on developer unit causes line on print
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Troubleshooting
1) Remove the developer unit.
(Refer to 3.2.2.2. Deve Unit)
2) Disassemble the developer unit cover (pay attention not to destroy lock) Empty developer out on clean paper.
3) Remove lumps with the Jig from mag roller.
4) Pay attention & clean the circled area where oil can cause build-up in the Fuser.
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4. Troubleshooting
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