50.1 fuser error not fixed by instruction on machine; HP color laserject 3500

Error 50 is a fuser error, probably you must change the fuser unit.

Hey Joe,
This is what the HP Website has to say about it:
50.X FUSER ERROR Description A fuser error has occurred. Action

1. Turn the printer off.
2. Verify the fuser is properly installed and fully seated.
3. Turn on the printer.
4. If the message persists, contact HP Support.

BUT! you can try performing a cold reset, and maybe this would help:
500, 3550, 3700, 4600, 4650, 5500, 5550, 8500, 8550, 9500) use the instructions below. 1. Turn the printer on.
2. When the memory starts counting on the control panel, press and hold the green SELECT button. Continue to hold green SELECT button until all three Control Panel LED's are illuminated and on solid.
3. Release the green SELECT button.
4. The control panel will display SELECT LANGUAGE.
5. Press the DOWN ARROW button until control panel displays COLD RESET.
6. Press green SELECT button. The printer will perform a cold reset and then continue its power-on sequence.

Good luck!

Please replace the fuser assembly.

Yes they will

Try putting back the old fuser unit. If the machine works you have a defective fuser, even if it is a new one. If the machine still doesn't work you have a defecte high voltage assy. Gerrit Jan

From HP Website:
50.X FUSER ERROR Description A fuser error has occurred. Action

1. Turn the printer off.
2. Verify the fuser is properly installed and fully seated.
3. Turn on the printer.
4. If the message persists, contact HP Support.

error 50 means your fuser assembly has gone bad or its not getting power to be functional. you need to replace the fuser unit.

50.1 error is usually a fuser low temperature error. The thermistor (electronic termometer) that controls high and low temperature is either obstructed, damaged or the heating element inside the fuser has been brokem or damaged. Carefully remove and inspect the fuser. If you have no obstructions then the fuser will have to be replaced.

Here's a link to the full service manual in PDF for free. Good luck.

http://www.feedroller.com/Store/Service%20Manual/Color%20LaserJet%203500-3550-3700.pdf

Fuser Error 50.1 Fuser

Try this site

It seems they were able to fix it

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1151665&admit=-682735245+1192734448445+28353475