Samsung SL-M4580FX Service Manual page 217

► Error Code
U1–2316
U1–2317
U1–2320
U1–2321
U1–2323
U1–2332
U1–2339
U1–2341
U1–2342
U1–2343
U1–234H
► Error message
Fuser unit Failure: #U1-2xxx. Turn off then on. Call for service if the problem persists
► Symptom
The temperature control of fuser unit is abnormal. (Open Heat Error or Low Heat Error or Over Heat Error) / Thermistor
is defective. / Fuser unit connection is bad.
► 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) After checking the fuser installation, turn the machine off then on.
2) Open the rear cover. Lift up the right side and release the rear cover.
3) If there is no problem, remove 4 screws.
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4. Troubleshooting
4-114