Samsung MultiXpress M537x series Service Manual page 306

4. Troubleshooting
► Error Code
S5–3111
► Error message
UI System Failure #S5-3111:Turn off then on.
► Symptom
Communication error between main board and OPE board has occurred.
► Troubleshooting method
1) Remove the OPE hub board cover.
2) Check if the OPE Assy cable is connected to the OPE hub board correctly.
3) If the connection is OK, replace the OPE Assy.
4) If the OPE Assy is OK, replace the OPE hub board.
4-170 Copyright© 1995-2013 SAMSUNG. All rights reserved.