Samsung CLX-9201 Service Manual page 353

► Error Code
S1–2510
S1–2511
S1–2520
S1–2521
S1–2523
S1–2540
► Error message
MSOK System Failure #S1-2510: Turn off then on.
MSOK System Failure #S1-2511: Turn off then on.
MSOK Failure: #S1-2520. Call for service.
MSOK Failure: #S1-2521. Call for service
PPM data is incorrect. Call for service & change MSOK
MSOK Failure: #S1-2540. Call for service & change MSOK
► Symptom
MSOK is not installed properly. / MSOK is defective.
► Troubleshooting method
1) Remove the rear cover.
(Refer to 3.3.2 Rear Cover)
2) Check if the MSOK is inserted correctly. Remove and reinstall it.
3) If the problem persists, replace the main board(JC92–02429A).
(Refer to 3.3.7 Main Board)
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4. Troubleshooting
4-170