4. Troubleshooting
► Error Code
S1–2510
S1–2521
► Error message
MSOK System Failure #S1-2510: Turn off then on.
MSOK Failure: #S1-2521. Call for service
► Symptom
MSOK is not installed properly. / MSOK is defective.
► Troubleshooting method
1) Remove the rear cover.
2) Check if the MSOK is inserted correctly. Remove and reinstall it.
3) If the problem persists, replace the main board.
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