[TechAssist] Re: microwave
- From: "George" <grndmstrg@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 29 Dec 2001 21:53:32 -0800
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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