Samsung MultiXpress K7 Series Service Manual page 414

4. Troubleshooting
► Error Code
U1–2xxx
► Error message
Fuser Unit Failure: #U1-2xxx Turn off then on
► Symptom
The thermistor can't measure temperature. The hear-roller will not heat-up. / Temperature of the fuser increases
abnormally.
► Troubleshooting method
NOTE
To see the troubleshooting video for this error, click through to the link below.
• U1–2316 : http://tsp.samsung.com/tsp_file/spds/samsungprinter/K7/Webview/EN_K7_U1-2316.html
• U1–2317 : http://tsp.samsung.com/tsp_file/spds/samsungprinter/K7/Webview/EN_K7_U1-2317.html
• U1–2320 : http://tsp.samsung.com/tsp_file/spds/samsungprinter/K7/Webview/EN_K7_U1-2320.htm
• U1–2321 : http://tsp.samsung.com/tsp_file/spds/samsungprinter/K7/Webview/EN_K7_U1-2321.html
• U1–2323 : http://tsp.samsung.com/tsp_file/spds/samsungprinter/K7/Webview/EN_K7_U1-2323.html
• U1-2332 : http://tsp.samsung.com/tsp_file/spds/samsungprinter/K7/Webview/EN_K7_U1-2332.html
• U1–2339 : http://tsp.samsung.com/tsp_file/spds/samsungprinter/K7/Webview/EN_K7_U1-2339.html
• U1–2341 : http://tsp.samsung.com/tsp_file/spds/samsungprinter/K7/Webview/EN_K7_U1-2341.html
• U1–234H : http://tsp.samsung.com/tsp_file/spds/samsungprinter/K7/Webview/EN_K7_U1-234H.html
1) Remove the fuser unit. After opening the jam cover, check if jammed or wrapped paper is in the fuser unit.
2) Re-install the fuser unit, then turn the machine on.
3) If the problem persists, check the following :
a) Check if the Halogen lamp is broken or disconnected.
b) Check if the AC connection of the Halogen lamp is disconnected or contaminated.
c) Check if the thermostat is disconnected.
d) Check if the non-contact type thermistor is broken.
4) If the problem persists, replace the Fuser unit
5) If the problem persists, replace the Main board or FDB board, SMPS
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