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Article #1521

Microwave oven blowing fuses

#1521
From: Les Bartel
Date: Tue, 21 Jul 1992 18:56
18 lines
1323 bytes
I have a GE microwave oven that is blowing fuses when the high voltage
transformer is switched on by the triac when using the 'low' or 'medium'
settings.  The triac is turned on by an opto-isolator driven by the
timer board.  When the triac turns on, my ammeter shows about a 40 amp
surge (the needle moves to about half scale, I don't know how much is
needle inertia, because the triac shuts off immediatly [and it should
with that kind of load!]).  Another indication of the surge is a slight
dimming of the lights on that circuit at the same time.  When operated
on high, the oven works fine.  My question is: Is it likely to be a bad
triac, or timer board?  The oven was manufactured in 1983 and has given
me no problems at all with daily use (except for a few burned out bulbs).

 - Les

-- 
Les Bartel			lester@naomi.b23b.ingr.com
Dazix, An Intergraph Company	uunet!ingr!b23b!naomi!lester
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Message-ID: <1992Jul21.185605.6588@b11.b11.ingr.com>
Path: arc1-ca.pugleaf.net!sparky!uunet!infonode!ingr!b11!naomi!lester

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Newsgroups: sci.electronics
Path: arc1-ca.pugleaf.net!sparky!uunet!infonode!ingr!b11!naomi!lester
From: lester@naomi.NoSubdomain.NoDomain (Les Bartel)
Subject: Microwave oven blowing fuses
Message-ID: <1992Jul21.185605.6588@b11.b11.ingr.com>
Sender: usenet@b11.b11.ingr.com (Usenet Network)
Reply-To: lester@naomi.b23b.ingr.com
Organization: Dazix, An Intergraph Company
Date: Tue, 21 Jul 1992 18:56:05 GMT
Lines: 18