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50.3 means the fuser is getting too hot. It will either be a problem with the thermistor in the fuser or the power supply. If you can find a another fuser to test with you can answer the question pretty quickly.
I've seen this exact error a few times on the 4101s & turned out to be a bad EIO hard drive.If you replace the drive, you'll most likely have to download the newest firmware & load it to get every feature back. You can try & initialize the drive first though: - Turn off printer - Press & hold [Start] button - Turn printer on, wait for all 3 LEDs to stay solid then release button - Press & release [Left] arrow button (should read "Initialize Disks" on display - Press & release [Select], then wait for printer to warm up Listen also to the drive & if you hear it clicking over & over then it's bad & will need replaced.
FROM THE SERVICE MANUAL
W2 INVALID PERS:
The job was not printed because the requested personality,
such as PostScript, was not installed. Install the language in
which the files are sent, together with enough memory to
support that language.
I SUGGEST CHECK IF YOU GOT THE POSTSCRIPT INSTALLED
1 Turn the printer off. 2 Turn the printer on. 3 Press and hold PAUSE/RESUME (LJ 9500) or START (LJ 9500mfp) on the control panel during the memory count. 4 Hold PAUSE/RESUME (LJ 9500) or START (LJ 9500mfp) down until all three error lights illuminate steadily. 5 Press (the 5 button on the MFP) until INITIALIZE DISKS appears on the display panel. 6 Press (the 6 button on the MFP). 7 The printer begins initializing the disk (this might take a moment). The control panel displays the HP event logo and eventually displays READY.
49 error normally means that the information sent to the printer is corrupted clear the print que shut down printer and restart. If problem still there then shutdown the printer then remove one of the additional memory turn back on if still same problem repeat removal of the next memory replacing the one you have just removed and so on. After you have done this and you are still getting the problem then it is 99% certain that the printer system firmware is corrupted or the formatter control board is faulty.