Samsung CLX-8640 series Service Manual page 406

4. Troubleshooting
► Error Code
U1–233x
► Error message
Fuser Unit Failure: #U1-233x. Turn off then on.
► Symptom
The temperature of fuser unit is low. (Low Heat Error)
► Troubleshooting method
CAUTION
The temperature gets hot around the Fuser Unit. To prevent injury, 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 if the paper is curled on the fuser belt.
5) If yes, replace the fuser unit. If not, check the followings.
a) Check if the input voltage is normal.
b) Remove 8 screws. Remove left/right/top cover.
c) Remove 8 screws. Remove the bracket.
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