Samsung MULTIXPRESS CLX-9251 Series Service Manual page 357

► Error Code
S1–4311
► Error message
Video System Failure #S1-4311: Turn off then on.
► Symptom
The USB device chip is defective.
► Troubleshooting method
1) Turn the machine off then on.
2) If the problem persistss, turn the machine off again.
3) Remove and disassemble the OPE unit.
(Refer to 3.3.6 OPE Unit)
4) Replace the OPE main board(JC92–02436A).
5) Assemble the OPE unit.
6) Turn the machine on.
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4. Troubleshooting
4-172