Error fuser unit hl-5350Dn - Brother HL 5250DN Laser Printer

This is a technical procedure. But if you are up for it follow the links below which should give you enough details presuming that you have purchased a new fuser unit.
http://depot.hrblock.com/technologyservices/DownloadFiles/Brother2460NFuserReplacementManual.pdf

How to fix fuser error Brother HL 2460 printer

Please check mainboard

Could it be a paper jam in the fuser ?

All sharp AR error code call Expert on 08100527856 for repair

Brother error e50
The error code E50 indicates a fuser unit failure - the fuser unit is no longer working and needs replacing. The error may also display itself on your Brother printer's front display panel as "Fuser Unit Failure" or "Replace Fuser Unit."

What Does the Brother Printer Code E50 Mean? - Small ...

You have a fuser malfunction, replace the fuser unit.

Sounds like a fusing error ... If your able to wipe the toner off the page its a fuser unit problem (replace fuser unit) If toner is sticking to paper but the print quality is poor , replace the drum unit  (PCU)  good luck

I have 2 printers that dosn´t work. Brother HL-5250 dn One with fuser that dosn´t work. Can I take thee fuser from the other and attach it into the first one. Or do you ned spcial tools and knowldge to do it?
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Error 50 is a fuser unit fault code. You can take apart the fuser unit and see if the fuser lamp is functional. Also check some of the other thermal parts on the fuser. If everything checks out, you will probably have to replace the thermistor. You will need to see if it will be cost effective to replace the necessary parts (Brother parts are not cheap), or to buy a new printer. Hope this helps. Good luck.