Microwave buzzing a vibrating

[Ken G.]

You did good . I have found that diode bad in many old microwaves .

I dont know how many of you work on newer microwaves . Some of them no
longer have that big heavy transformer instead they used an inverter
board .
These make for great features on the oven but the first ones had alot of
trouble
If the mag went bad the oven will runf or 3 to 6 seconds then shut off
A bad hi-volt diode on the board ,, same thing .

Those new small size Magic-chef do have a big transformer but they used
very thin red cloth covered wire for hi-voltage . The wire in some of
them laying next to any metal started arcing and caused that vibrating
.. with a smell . I cant believe they used that wire for HV .
The newest model has a bare coax wire that was misplaced that falls
against the light socket contact and fries a panel board copper trace
and a relay .
Great quality

 

[mm]

On 28 Feb 2006 08:29:20 -0500, Sam Goldwasser <sam@saul.cis.upenn.edu>
wrote:

mm <NOPSAMmm2005@bigfoot.com> writes:
On Mon, 27 Feb 2006 15:30:07 -0800, "Steve B"
boozoochavez@zydeco.net> wrote:

Buzzing is the last thing a microwave does before detonates.
HTH

Don't they have a red light timer inside that counts down to zero?
All the bombs on tv have that.

And unmarked red and blue wires.....

Yeah. I remember that movie. The guy taking apart the bomb said, I
think I should cut the white wire. The guy on the phone said, No, Cut
the white wire. I think it's the white wire. No. the white wire.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/

Remove NOPSAM to email me. Please let
me know if you have posted also.

 

[Seafarer]

On Tue, 28 Feb 2006 06:55:31 -0700, goodguyy@webtv.net (Ken G.) wrote:

You did good . I have found that diode bad in many old microwaves .

I dont know how many of you work on newer microwaves . Some of them no
longer have that big heavy transformer instead they used an inverter
board .
These make for great features on the oven but the first ones had alot of
trouble
If the mag went bad the oven will runf or 3 to 6 seconds then shut off
A bad hi-volt diode on the board ,, same thing .

Those new small size Magic-chef do have a big transformer but they used
very thin red cloth covered wire for hi-voltage . The wire in some of
them laying next to any metal started arcing and caused that vibrating
. with a smell . I cant believe they used that wire for HV .
The newest model has a bare coax wire that was misplaced that falls
against the light socket contact and fries a panel board copper trace
and a relay .
Great quality

Brings me back to a rant I had with a Pansasonic Microwave.I've

repaired loads of microwaves[I had a couple of restaurant chains
service contracts] yet this inverter board went down.
I knew this was a standard fault and I quickly found the Tranny that
was short b/e.
They wanted 160 pounds approx for a whole new board on exchange! the
microwave cost 220 pounds new so that makes sense dosn't it?
They and others use inverter boards to reduce weight but they are very
flaky.I advise my customers to go for the standard construction and to
ask me before buying[if not from me].
It's a rip off.