Samsung MultiXpress M5370 Series Service Manual page 347

► Error Code
S2–1211
► Error message
Engine System Failure: #S2-1211. Turn off then on
► Symptom
Communication error between the ASIC on main board and microcontroller IC has occurred.
► Troubleshooting method
1) Turn the machine off and on.
2) If the problem persists, turn the machine off again.
3) Remove the rear cover.
4) Replace the main board.
5) Assemble the rear cover. Turn the machine on.
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4. Troubleshooting
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