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How to Identify and Fix Common Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

When a 50. xx. yz Fuser error To continue turn off then on is displayed on the control panel, it indicates that there is an issue with the fuser. The XX and YZ are two digit codes that provide information on the specific issue causing the error.
The message `Fuser Error` or `Self-Diagnostic` means either the fuser has reached the maximum temperature allowed or there has been an error in detection of the correct temperature during specific times of the printing process.
If you are seeing a “50.1 Fuser Error” on your HP LaserJet 5000 or 5100 series printer, you probably need to replace the fuser. Fusers are a consumable part and are sold as part of a maintenance kit; it is expected over the life of the printer you will replace the fuser several times.
Machine Error 50 is an indication of a mechanical malfunction of the Brother machine. Unplugging the machine from the power outlet for approximately 30 seconds and then plugging it back in may temporarily resolve the issue.
The fuser unit or fuser is a critical part of any laser printer. Using pressure and heat, it fuses the toner powder onto the page to create a print, and without it, the printer cannot operate.
Fuser Units

The coating wears off and causes the toner to not fuse properly. There are replacement rollers and sleeves on the market that you can replace and turn a non-functional fuser into a good working one. Rebuilding fuser assemblies is not a new thing.

When a 50.4F. 00 error is displayed on the control panel, it indicates that there is an issue with the fuser or the power outlet where the printer is connected. Turn the printer off, and then back on to clear the error. Ensure that the power outlet, to which the printer is connected, is in good working condition.
Streaking, smudging, black lines, and double images are all symptoms of a bad fuser. When you notice these printing defects and experience problems, such as paper jams or wrinkles, this is a good sign to replace the fuser kit.
Printing made easy with an HP Fuser Kit

It lets you print up to 150,000 pages of dynamic quality before you need to replace it.

Error 50.8 suggests one end of the fuser is not heating up which may be damage to the sleeve or heavy media. The fuser may not be to blame.
50.2 error indicates that the printer is not heating up fast enough. This can be caused by a bad heating element in the fuser but can also be caused when the printer does not have adequate power due to overloaded circuits or being plugged into a power strip or surge bar that limits current flow.
If you have NOT recently replaced the fuser or heavily jostled the printer around, then the 50.7 Fuser error indicates you have an actual fuser failure (the gearing pressure is not releasing) and the fuser needs replacing.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

HP Laserjet 4200 50.2 Fuser error
ANSWER : if you are using a good fuser the next part to try would be low voltage power supply

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HP laser jet 3015 "Upgrade Error Call HP Support"
ANSWER : rgtr

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HP Laserjet 4250 – RFU LOAD ERROR
ANSWER : Italiano:

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HP 4250 13.06.00 Fuser output paper stop !
ANSWER : pick up solenoid

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HP 4050 Error 13.1 & 13.20
ANSWER : I tried the fix you recommended but it still would not fix.

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Error Code 51.1 says Printer Error No Kidding.lol
ANSWER : Sometimes turning off and on will allow you to print a few pages. The error is a beam detect error. The only real fix is to replace the laser scanner unit. Could be a loose connector on the scanner or DC controller from the scanner. That’s unlikely. You could try the only other free fix which is to open the scanner assy. and clean all the mirrors inside. The dust could obstruct the laser beam enough to cause the detect error.

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HP 9040 MFP Error code
ANSWER : bonsoir

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HP Color Laserjet 500 series M551n Error 98.00.0C
ANSWER : I just ran into one of these on a 4 year old m551. Failed to complete startup at the end of disk check. Followed the above link for troubleshooting.

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