Here at work our little Samsung microwave was cooking away and then just
quit. Upon investigating it, I find the fuse blown. Ok, then check the
door switches - all 3 ok. I have put a copy of the schematic at
http://www.kcswug.com/documents/SamsungMW21310.pdf .

If I replace the 15A fuse with a little larger one, it will come on but with
an abnormally loud hum. If I unplug the magnetron by pulling the wire from
the FA terminal, the excessive hum is still there, which to me means that
the magnetron isn't the cause of the problem here. If I lift the rectifier
ground, then the hum stops. The rectifier isn't shorted, but I also can't
test it with my Fluke meter as it reads open both directions. But the spec
sheet on the rectifier says it needs 14 volts to pass through it, and my
meter only has a 9 v battery. When I measure the cap, I get .2 ohms across
it, which tells me it is shorted unless there's something special about it
that I don't understand.

Sound reasonable?

WT

"Wayne Tiffany" wrote in message
. com...
Here at work our little Samsung microwave was cooking away and then just
quit. Upon investigating it, I find the fuse blown. Ok, then check the
door switches - all 3 ok. I have put a copy of the schematic at
http://www.kcswug.com/documents/SamsungMW21310.pdf .

If I replace the 15A fuse with a little larger one, it will come on but
with an abnormally loud hum. If I unplug the magnetron by pulling the
wire from the FA terminal, the excessive hum is still there, which to me
means that the magnetron isn't the cause of the problem here. If I lift
the rectifier ground, then the hum stops. The rectifier isn't shorted,
but I also can't test it with my Fluke meter as it reads open both
directions. But the spec sheet on the rectifier says it needs 14 volts to
pass through it, and my meter only has a 9 v battery. When I measure the
cap, I get .2 ohms across it, which tells me it is shorted unless there's
something special about it that I don't understand.

Sound reasonable?

WT



The capacitor is shorted. I have a whole pile of microwave parts, if you
want a good used capacitor, just email me with the value and approximate
physical size and I'll send you something that should work for the cost of
postage.

"Meat Plow" wrote in message
...

The cap is shorted

Thanks guys - I'll pull it out tonight to see what it is.

WT

"James Sweet" wrote in message
news:nzXzj.6027$H%3.1656@trndny01...

The capacitor is shorted. I have a whole pile of microwave parts, if you
want a good used capacitor, just email me with the value and approximate
physical size and I'll send you something that should work for the cost of
postage.


Here is a pic of the cap. It is the classic obround shape, with the width
of 51mm and the thickness of 31mm on the body of the can. See if you have
something like that.

http://www.kcswug.com/documents/SamsungCap.pdf

WT

Meat Plow wrote:
On Thu, 06 Mar 2008 13:16:24 -0600, Wayne Tiffany wrote:

Here at work our little Samsung microwave was cooking away and then just
quit. Upon investigating it, I find the fuse blown. Ok, then check the
door switches - all 3 ok. I have put a copy of the schematic at
http://www.kcswug.com/documents/SamsungMW21310.pdf .

If I replace the 15A fuse with a little larger one, it will come on but with
an abnormally loud hum. If I unplug the magnetron by pulling the wire from
the FA terminal, the excessive hum is still there, which to me means that
the magnetron isn't the cause of the problem here. If I lift the rectifier
ground, then the hum stops. The rectifier isn't shorted, but I also can't
test it with my Fluke meter as it reads open both directions. But the spec
sheet on the rectifier says it needs 14 volts to pass through it, and my
meter only has a 9 v battery. When I measure the cap, I get .2 ohms across
it, which tells me it is shorted unless there's something special about it
that I don't understand.

Sound reasonable?

WT

The cap is shorted


Which is probably a good thing or the OP might easily have fritzed himself!

Ron(UK)

"James Sweet" wrote in message
news:nzXzj.6027$H%3.1656@trndny01...

The capacitor is shorted. I have a whole pile of microwave parts, if you
want a good used capacitor, just email me with the value and approximate
physical size and I'll send you something that should work for the cost of
postage.

I found one here so no need to look. Thanks anyway.

WT

We are up and running again - the cap it was.

WT