[TechAssist] Re: microwave

You're right George, just a mind fart. But to a human whether its 24 or 28
mghz doesn't really make much difference, if you come in contact with it and
are not frozen to it, you'll find yourself on the other side of the room.
( only a penny's worth)  Peter Kowalik  pe.kow@xxxxxxxxxxxx  Keith's Stereo
Burl  On    P.S. haven't had to do much MW service over the last 7-8 years,
but before that in the 80's and 90's used to see as many as 10 a week (
Tosh, Pana & Quas ASC)

-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of George
Sent: December 30, 2001 12:54 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: microwave


Hey Peter,

Good info only, I thought it oscillated at 2450 MHz and it could be pulsed
for heat control (Power Level). Where did you read that it was 28MHz?

George
Afana Electronics
Moreno Valley, CA

----- Original Message -----
From: "peter" <pe.kow@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, December 26, 2003 8:06 PM
Subject: [TechAssist] Re: microwave


> 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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