4. Troubleshooting► Error CodeS1–2510S1–2511S1–2520S1–2521S1–2523S1–2540► Error messageMSOK 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 servicePPM data is incorrect. Call for service & change MSOKMSOK Failure: #S1-2540. Call for service & change MSOK► SymptomMSOK is not installed properly. / MSOK is defective.► Troubleshooting method1) 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)Copyright© 1995-2013 SAMSUNG. All rights reserved. 4-170