How do I know my fuser is good or not?

check the connector that the fuser connects to for damage. If the plug is intact you will probably need to replace the power supply (Low Voltage PS) C8546-69003 is the part number

on a unit of this vintage the part won't be cheap. A quick search on the net shows it from $350 - $600

Good luck

I think the F5 error is a fuser failure error. Check that the fuser is seated correctly in the printer.
If the error does not come up all the time perhaps you can check the fuser is getting hot.
If available perhaps try substituting the fuser for a replacement known good fuser to fully identify the fuser as the cause of the error

This is an error in the rotation of the fuser motor. My problems have all been a result of the web getting tangled up in the fuser rollers. Check that the fuser freely turns. Check the bearings of both rollers, one or more may be bad. Good luck.

the 50,2 error is a fuser error, and should be serviced by a repair facility. You can try to replace the fuser yourself, but the labor should be pretty cheap compared to the cost of the fuser assembly.

The "fuser" uses heat to melt the dry ink onto the paper. So, if the fuser has malfunctioned, it must be either serviced or replaced.

Loose fuser tabs on the HP LaserJet 4000/4050/4100 - a potential 50.2 error If you experience a "50.2" fuser error while using a LaserJet 4000, 4050, or 4100 fuser, you should check to see if two tabs on the fuser have come loose. (They can get dislodged during shipping or during istallation.)
Turn your printer off and remove your fuser. Flip it to the gear side (the left side) and press inwards on the fuser tab to make sure it is fully clicked in place, as shown below.

Then flip the fuser over to the right side (the non-gear side) and press in on the other fuser tab to make sure it is also fully clicked in place.
(right side of a LaserJet 4000/4050 fuser pictured below)
(right side of a LaserJet 4100 fuser pictured below)

possibly the fusers thermostat is displaced. it rides very close to the roller to get an accurate reading, look for 2 wires into a black "thing" toward the middle of the roller. this is a thermistor which sends its reading to the mainboard. check if the fuser is getting very warm, there is a thermo couple in series with the fusers power so it wont overheat but if its getting hot and the printer doesnt know it then the dammaged/displaced thermostat would be the thing to look for,

Hi, Barbara.

If error: 010-349 That is a fuser error.
Open the rear door. Remove and reseat the fuser.
If this does not work, you will need a new fuser.

If not that specific error, just let us know.

Hope this helps.

Hey, if your Dell 2335DN has a fuser error or low heat error first try cycling the power (powering off and back on the machine). If this doesn't fix it, you should replace the fuser (part# KW449). Here is a video showing how to replace it and where you can purchase one. Good luck!">

C7 Fusing unit not warming up properly. It can be the fuser is not in correctly, fuser connector not making good contact, defective thermistor, fusing lamp or thermofuse.
Hope that helps...