Samsung MultiXpress M537x series Service Manual page 314

4. Troubleshooting
► Error Code
U1–2117
U1–212x
U1–213x
U1–23xx
► Error message
Fuser Unit Failure: #U1-21xx. Turn off then on.
Fuser Unit Failure: #U1-23xx. Turn off then on.
► Symptom
The temperature control of fuser unit is abnormal. The fuser temperature has dropped below the normal value.
► Troubleshooting method
CAUTION
The temperature gets hot around the Fuser Unit. To prevent burns, make sure the Fuser Unit area is cool before
performing this procedure.
1) Turn the machine off then on.
2) Turn the machine off. Re-install the fuser unit. Then turn the machine on.
3) If the problem persists, remove the fuser unit.
4) Check the fuser components.
• Check if the thermistor is assembled correctly.
• Check if the thermostat is connected.
• Check if the center and side lamps are in short status. (Measure the resistance value between the common-center
and common-side.)
5) If there are any defective parts in step5, replace the fuser unit.
6) If the problem persists, replace these parts in regular sequence.
• Fuser Drive Board
• Main board
• SMPS board
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