I have a SP C420 (type 145) fuser getting SC542 error. I believe it's about thermistor reading failure. A have an working SP C430 thermistor availabe to buy , but,despite the thermistors are apparently identical, I could note that the plug are diferent. The C420 has 4 pins (two as a jumper, and the others going to the thermistor), and the C430 has only two pins. Both going to the thermistor (and no jumper). Does any one knows if they are compatible? If so, I could easily change the plugs. Thanks and sorry for my bad english.