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Help identifying diode
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Franc Zabkar
electronics forum Guru


Joined: 01 May 2005
Posts: 616

PostPosted: Sun Jun 25, 2006 7:51 am    Post subject: Re: Help identifying diode Reply with quote

On 24 Jun 2006 15:38:23 -0700, "jonte42" <googlegroups@saga.nu> put
finger to keyboard and composed:

Quote:
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:

http://www.lindell.se/diode1.jpg
http://www.lindell.se/diode2.jpg
http://www.lindell.se/diode3.jpg

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

Could it be something like a BZX79-A12 12V 0.5W zener? The "A"
indicates 1% tolerance. The "B" and "C" versions have tolerances of 2%
and 5%, respectively.

If the diode is part of a simple linear zener regulated power supply,
then there should be an electro in parallel with it, and a resistor in
series. The zener may drive the base of a pass transistor.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
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jonte42
electronics forum beginner


Joined: 24 Jun 2006
Posts: 1

PostPosted: Sat Jun 24, 2006 10:38 pm    Post subject: Help identifying diode Reply with quote

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:

http://www.lindell.se/diode1.jpg
http://www.lindell.se/diode2.jpg
http://www.lindell.se/diode3.jpg

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
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