Samsung CLX-3185 Service Manual page 140

b) Low heat error
"Error #U1-2121 Turn off then on"
message has occurred.
(For 110V : 1.35±1 ohm
For 220V : 4.7±1 ohm)
Thermostat cannot be
cleaned and/or bent?
Thermostat Resistance Defect?
(300~450kohm @ 25℃)
Service Manual
Alignment & Troubleshooting
Lamp open?
NO
NO
NO
Yes
Yes
Yes
Replace Fuser & recheck
The SMPS and Main B'd
4-66
Change Fuser Lamp
4713-001243
Replace Thermistor
1404-001447
Replace Thermistor
1404-001447
could be suspect
Samsung Electronics