Laserjet Pro 200 MFP M276nw Error 50.4

[Andy865]

I have a problem with the Laserjet Pro 200. The error only occurs a few minutes after the printer is switched on. The system check is ok. It prints cleanly until the error occurs. The heater is ok and a regulated voltage is also present on the heater. As already said, the printouts are ok until the error occurs. What else can be wrong with the fuser unit? Or is it more the power supply?

[ALS-77]

Make sure you're plugged straight into a wall outlet and not into a power strip, surge protector or UPS as these can affect the power the printer needs to work correctly. Also, make sure you're not overloading the electrical circuit with multiple other devices that may be affecting the power the printer is getting. 

If all that is OK, then you could simply have a fuser that isn't working quite right. It's also possible you could have a low voltage power supply problem, but my bet is still on the fuser if everything else checks out. I've replaced them before for that issue.

[Andy865]

So what is wrong with the fuser? Does anyone have a circuit diagram so that I can measure the voltages? It is hardly worth replacing a fuser unit when new printers are around € 150. I also find it exciting that the device prints at the beginning and the fault occurs later.

[Andr-1611]

@Andy865 

Welcome to the HP Support Community!

Please check this one.

Turn the product power off, wait at least 30 seconds, and then turn the product power on and wait for
it to initialize.
Turn off the product, wait at least 25 minutes, and then turn on the product.
If you are using a surge protector, remove it. Plug the product directly into the wall socket. Turn the
product power on.

A circuit diagram is not available.

Hope this helps! Keep me posted.
Andreas

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[Andy865]

Thanks for the answer. I don't have surge protection. Whenever I have disconnected the device from the mains for approx. 25 minutes, the device runs again. It then prints everything out. But only for about 5 minutes the joy is over. It cannot be a real defect, since everything works for 5 minutes.

[ALS-77]

Fusers typically have a couple of sensors built in them to monitor power and heat. Either could be defective. Many years ago we used to be able to ohm out the sensors on fusers to check them, but I don't know about today's fusers and without tearing one apart, it'd be trial and error to figure out the wiring. These days we just replace it to test if it is the problem. It would also be difficult to get to the wiring to test it when it was in a failed state as it would need to be in the printer running till it failed, then disassemble the printer enough to check the fuser wiring.

The low voltage PS could also be defective and not providing the right amount of stable voltage or current. It could also be the main power that you are plugged into that isn't stable or adequate that can also cause this error. 

You'd have to get a power monitor analyzer to check your main power for any issues. My company uses them from time to time to help rule out or confirm bad power for weird issues. You could also just use a simple volt meter to measure your line voltage to make sure it's stable and within limits for the printer. 

Sorry I don't have an easy answer for you. After checking a few things, I'll start replacing components to see what fixes it.

[Andr-1611]

Did you check all the toner Cartridges?

Are other errors logged in the toolbox, event logs?

[Andy865]

Thank you for your answer. Unfortunately I have no parts to exchange.
Buying the parts exceeds the economic value of the device.
It's a shame that we can still afford to waste such resources.

[ALS-77]

I understand. I would try replacing the fuser myself. 

Below are the part numbers for the fusers. Do a Google search for the one you need to see what current pricing is. Maybe you'll find one cheap enough to try.

Fuser power supply assembly (220V-240V)   RM1-8710-000 
Fuser power supply assembly (110V-127V)   RM1-8709-000