Re: Help identifying glass diode?

From: legg (legg_at_nospam.magma.ca)
Date: 07/07/04 

Date: Wed, 07 Jul 2004 16:20:27 GMT

On Wed, 7 Jul 2004 06:32:02 -0700, DaveC <me@privacy.net> wrote:

>On Wed, 7 Jul 2004 02:35:05 -0700, legg wrote
>(in article <bngne0d61uqpj486b53g60hkc3fj5pr7a3@4ax.com>):
>
>> So its a BZX55C18 (BZX79C18) or similar 18V 400mw(500mW) zener.
>
>Fairchild semi's data *** now in hand.
>
>> You have not reported on impedance measurements of the part's vacant
>> position, or the disonnected part.
>
>Diode is shorted in both polarities. Vacant position is relatively high
>impedance (10K ohms).

You should now check the power device to ensure continuity on it's
terminals, through the device, and svice function, if possible.

The terminal connecting to the shorted zener location has likely gone
open circuit internally, unless another series element has done so
first.

RL

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