Operating instructions how to set the clock etc con my mircoware

https://www.manualslib.com/products/Panasonic-Nn-St652w-3493267.html


Panasonic NN ST652W Manuals

Press stop or clear, then press clock, set the time of day. Then press clock again. I believe.

Hello Two options to try: a) Press the Clock / Timer button 3 times b) Unplug, wait a few seconds, then re-plug to power up with the factory settings. You will need to reset your clock and any favourite settings.
This should work with all Panasonic Microwave models.
Good luck

Check behind the grill on the front top of unit. you can remove it by takign out a few screws from the top. There may be an access door there, if not unit would have to be pulled down and the case taken apart.

It could be a magnetron sparks to the open metal inside the m/w cavity or some broken wire on high voltage side. It is not HV transformer (when burn create a lot of smoke and bad smell). Magnetron needs to be replace.

I’m happy to help further over the phone at https://www.6ya.com/expert/vitaliy_f406165329c75ede