Trying to repair display/electronics card in Miele microwave oven, cirka 1990 (it's custom built into kitchen panel, so I prefer keeping it if it's possible).
I have this shorted diode, it's part of the power supply to the card:
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It has plastic body, 5 mm length.
The label: A12 J 9H And the "J" is 50% larger than the other characters.
I have spent hours on google trying to identify it and/or finding an equivalent, but no luck. No circuit diagram, and I'm not skilled enough to determine it's function, could be a Zener diode.
So please, any tips on how to identify it are welcome!
Regards, Jonatan Lindell