Sir, We have a hp laserjet 4250n printer since

turn the printer off for at least 20 minutes, then cycle power. If the 50.2 fuser error occurs again, you may need to replace the entire fuser assembly OR you will need to replace the power supply.

Checkout this page for detailed information about HP Laserjet 2840 parts

Any of the 49 errors are from the formatter board, you may need new memory, or a new board. The machine doesn't reset from this error without a new board.

I am willing to bet that you may have a faulty thermistor in your fuser asssembly, I wouldn't bother replacing the thermistor, your best bet is to just replace the fuser assembly and this should resolve your issue, so replace the fuser or call someone to do it for you. This should resolve your issue.

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.

Try unplugging the printer for 30 mins. You may still have a defective fuser.

HP error message 50.X is usually a fuser error. replace fuser

Hello Sir,

I have a printer HP Laserjet 3050. this shows a problem "50 FUser Problem". Please turn off and start again.
please give me detail solutions about this problem.

Thank you.


Regards

Vikash Verma
LDC Engineering College Allahabad

Put a maintence kit in your machine, easy install, everything just clicks in, Every 200 000 prints it should be done, it includes the fuser, all feed rollers, sep pad and transfer roller.

These are great printing machine, they only ever need the MK and on this model a fuser drive gear wears and get noisy, but once that has been done once, it is ok from then on.
KIts seem expensive but they are meant to last 200 000 prints and usally do. These are one of the best most reliable printers in the market.

LINK to part info

Replace the main motor assembly. A qualified tech will need to do this.