If your HP LaserJet printer repeatedly reports "50 Service Error", "50.6 Fuser Error" or similar even after switching off and letting it cool down for 20 minutes or more, the chances are you need a replacement fuser unit. Fuser assemblies contain the heat and pressure rollers that "fuse" the toner onto the paper.
Refurbished fusers offer a low cost alternative to new fusers and this is particularly useful when products have become obsolete or unobtainable.
If you're unsure of the HP fuser you need, look for your printer
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