[TechAssist] Re: microwave
- From: "Roger G/ Mr Fix-It" <rogerfixit@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 27 Dec 2003 19:20:54 -0500
You can test the High voltage side by connecting 110v AC to the
input side of the transformer. Put a small fluorescent lamp or a neon
lamp in the oven with a cup of water and power up for a short time.
If you get light, you have good components and problem is in the
front end.
Roger G.
Mr. Fix-It Harrisburg, PA 17110 WebSite-
http://mrfixit.netfirms.com
rogerfixit@xxxxxxxxxxx (alternate - rogerfixit@xxxxxxxx )
FAX 801-705-3748 ; Tel: 717-763-7098 (shop) 717-652-1703(home)
On 27 Dec 2003 at 14:01, J Silverman wrote:
> Not a microwave expert but I would think it would draw an increase in li=
ne
> current if the transformer is switching on. If the current does not go u=
p,
> it is not trying to start to heat so the problem would be at the
switch,
> triac, transformer primary, or control end.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> 864 232 3889
> Fax 271 2080
> mailto:greentron@xxxxxxx
> ----- Original Message -----
> From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, December 26, 2003 2:22 PM
> Subject: [TechAssist] Re: microwave
>
>
> > This may be rather unconventional but in such as case I use a
TV high
> > voltage probe, BUT you must connect the ground lead to the
magnetron and
> put
> > the tip of the probe to the casing (ground) because it is negative
DC I am
> > measuring to see if the magnetron is getting or not (about -1.5 to
-2KV).
> If
> > so, the magnetron must be bad. You should measure infinite
resistance from
> > the filament to the body of the magnetron so I don't see how you
can
> measure
> > an open on the magnetron (except between the filaments).
> >
> > Bob Waterman, CET=AE #RI-28
> > Master Technician License #9109
> > Service Manager / Parts Manager
> > Gemini Computer, TV, & Security Alarms
> > (508)695-7302
> > (508)695-7769 FAX
> > geminitv@xxxxxxxxxxxxxxxx
> > geminitv@xxxxxxx
> > www.geminicomputertvsecurityalarms.com
> >
> >
> > ----- Original Message -----
> > From: "Ed" <edb3@xxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, December 26, 2003 2:04 PM
> > 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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