Samsung ProXpress M453x series Service Manual page 184

4. Troubleshooting
► Error Code
S2–4310
► Error message
Rear door is open. Close the door
► Symptom
Rear cover is opened.
► Troubleshooting method
1) Open the rear cover and close it correctly.
2) Open the rear cover.
3) Check if the switch contact of the rear cover is deformed.
4) Remove the left cover.
5) Check the connection between the cover open sensor and HVPS board. Reconnect the harness. If the harness
is defective, replace it.
6) Open the rear cover. Check if the message is changed when pushing the micro switch(cover open sensor).
7) If the cover open sensor is defective, replace it.
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