There are Many MF8180C out there...and they are a good machine...however they had a Manufacturing FAULT and that is the POOR Quality of one Small plug on the FUSER unit RU5-8125....The FEMALE PLUG in the BACK of this machine has faulty Female Pins that Can and DO get pushed back into the base of the PLUG when the fuser is removed and reinserted...
Initally People THINK that the Fuser is BURNT out...BUT

Put a Multimeter across the White leads leadinginto the Fuser and then onto the White lead going INTO the Thermostat on the RHS and you should get a Full Circuit indicating that the heating element is IN FACT still OK ! Then Put the Multimeter on the other end of the plug and TEST the THERMOSTAT with the multimeter in the OHMS setting..you should get a resistance reading....Then the Thermostat is OK also....

NOW Just Look at the PINS in the BACK of the PLUG for the FUSER...most likley one/or two are recessed back in the plug...they should all be even at the FRONT of the PLUG....

Get some tweesers and Pull the little Pins Back out...so they are all lined up....

you will need to keep them there so get a TINY amount of Sicaflex (silicone adhesive-heat resistant...) and Put that UNDER Yes UNDER the Base of the PIN !!! NO UNDER !!!!
if you put in the pin the contacts will not meet....you just need to put a MINUTE amount under this pin to hold it out there.....IF you mess this UP you will have to HARD wire the Fuser in and that is a whole other matter.....

Good Luck Everyone I know this is the issue with the 8180c !!!!

regards Tony Gordon
www.whitelightfilm.com