[TechAssist] Re: microwave
- From: "peter" <pe.kow@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 26 Dec 2003 23:06:25 -0500
Ed If you remove the 2 wires off of the input side of the power transformer
and set up for cooking , you will measure AC going into the transformer,
therefore control assembly and switches are ok. Troubleshoot the secondary
side of the system. using a amp meter,if everything is hooked up and working
you will draw anywhere from 10 to 15 amps depending on size of MW. If when
you push the start button and you get a load vibrational noise as if unit
might be cooking but no heat seems to be produced then suspect that the
stacking diode is shorted. If you read an intact filament , no fuses popped
but have no heat then suspect that the magnetron has a shorted filament
winding. filament windings in a magnetron look to be about a 14 gauge wire,
twisted in a helix and if the wire shorts just inside the body of the
magnetron it will not heat the unit up. I'd be careful trying to measure
voltage of the magnetron, it will eat your meter quicker than you blink and
it oscillates at a slightly high frequency ( like 28 meghtz) hope this
helps.Peter Kowalik pe.kow@xxxxxxxxxxxx Keiths Stereo Burl Ont.
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Ed
Sent: December 26, 2003 2:04 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: microwave
Cant seem to find a reason for this thing not to heat, unless the mag is
bad, i can measure continuity across the mag term, its not open, or
shorted.wiring seems to be ok, door switches are working, the hv cap checks
ok, so does the diode, hope someone has a idea. How much voltage should
there be at the magnatron filiment terminals? The hv xformer isnt shorted,
and the windings are not open
Ed Video Pro-Tech Mesa AZ
----- Original Message -----
From: "Doug Keller" <dek@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, December 26, 2003 8:32 AM
Subject: [TechAssist] Re: microwave
> May be a thermal sensor problem. Check them and also verify that the
> airflow can get through the fins of the magnetron and help it to cool.
>
> Doug Keller
> Wis-Kel Electronics
> 101 Freeland Ave.
> Terra Alta, WV
> USA 26764
> dek@xxxxxxxxxxxxxx
> http://www.tech-assist.org
> "Learn from the mistakes of others, because you
> won't live long enough to make them all yourself"
>
>
>
> Ed wrote:
>
> >Really havent checked anything yet, have never workedon one, just wanted
to
> >get some ideas. I will pull it down later today, heated up a cup of
coffee
> >and it worked fine, the next cup it wouldnt heat, everything else is
running
> >ok. Does the magnatron usually go that fast?
> > Ed Video Pro-Tech
> > Mesa AZ
> >----- Original Message -----
> >From: "Doug Keller" <dek@xxxxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Friday, December 26, 2003 7:49 AM
> >Subject: [TechAssist] Re: microwave
> >
> >
> >
> >
> >>fuse?, power to trans?, HV? magnetron? What have you checked so far?
> >>
> >>Doug Keller
> >>Wis-Kel Electronics
> >>101 Freeland Ave.
> >>Terra Alta, WV
> >>USA 26764
> >>dek@xxxxxxxxxxxxxx
> >>http://www.tech-assist.org
> >>"Learn from the mistakes of others, because you
> >>won't live long enough to make them all yourself"
> >>
> >>
> >>
> >>Ed wrote:
> >>
> >>
> >>
> >>>anyone here experianced on microwave ovens? This is a GE over the stove
> >>>
> >>>
> >type, quit heating this morning. Maybe there are some common failures i
> >should look for, its a 1998 model GE, model JVM1450WA
> >
> >
> >>> Ed Video Pro-Tech
> >>> Mesa AZ
> >>>
> >>>
>
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