LaserJet Pro 300 color MFP M375dw 50.2 Fuser Error

[Joseph_Bruce]

I was recently greeted by this printer with the 50.2 Fuser Error message, and the notice to "Turn off then turn on."

While it's nice for the printer to suggest a solution; it would be better if it would actually say what's wrong.  50.2 equates to "slow fuser error" in the service manual; but that's not really much in the way of diagnosis or even helpful as it doesn't give a limit of how many times to cycle the power.

After about 4 attempts; I gave up and installed a NEW HP FUSER (not an OEM lookalike).  All of that printer love and removing every cover to get at the fuser was rewarded with; "50.2 Fuser Error."

Not being one to give up quickly; I removed every cover once again, and replaced the high voltage board with a NEW HP HIGH VOLTAGE BOARD (not an OEM lookalike); then reinstalled every cover (it won't fire up without the scanner installed).  And; I'm still met with; "50.2 Fuser Error."

I'd be ready to junk this printer except for the fact that it's now conned me out of a new fuser and high voltage board; and it had just been given a new set of toners (probably worth more than the printer cost).  None of our other printers use these cartridges; so I'm willing to give it one more shot if the odds are good.

Any suggestions?

Thanks in advance,

Joe

[Repairatrooper · Accepted solution]

Just to confirm, you replaced the HighVoltage board or the low voltage board RM1-9034-000CN. High voltage board has no control connection for the fuser. Fuser is fed from the power supply and controlled by the dc controller. Tech documentation recommends fuser first, low voltage second.

[Joseph_Bruce]

My advisor that shall remain unnamed suggested the High Voltage first. 

At least the Low Voltage has less covers to remove.

Thanks for the clue,

Joe

[Joseph_Bruce]

Changing out the power supply was a bigger chore than I thought it would or should be; but it fixed the printer.

Thanks for the pointer.

Best regards,

Joe