My 12 year old microwave quit heating today. I was warming some soup and
set it for the required time. When the cycle ended, the soup was warm,
but not hot. I ran the MW another minute and the soup did not get any
warmer. I tried yet another minute. It never got hot. The MW runs,
the timer works the platter rotates, but it just dont heat. I noticed
that it makes a loud hum, much louder than it did before.
I suspect that the heating element burned out, and probably costs more
for the parts to repair it, than to buy a new MW. But I thought I'd ask
if there could be something else that failed?
Is it normal to make a loud hum when they fail?
On Jan 6, 2:48 pm, firstname.lastname@example.org wrote:
The tube that generates the microwaves is called a Klystron. It looks
a lot like a regular vacuum tube you might have seen in an older TV
set. Anyway, the Klystron can fail in two ways. 1, It actually burns
out and you get no heating at all, 2, it gets weaker with age, and
heating times gradually increase. A third possibility is that some
other component in the uwave has failed.
Since you got some heating, and then it seems to have stopped heating,
we can pretty much eliminate the gradual failure. Only someone
familiar with mucrowave ovens can tell if the Klystron or some other
part has failed. And, you are right, the cost of repairing it can be
more than the cost of a new one.
So, you have to tell us a lot more, such as make, model, age,
appearance, etc, before we can advise you what route to take. Have
you tried to heat some cold water again? Was there any heating?
Yup, I used to work on TWT exciter-10KW Klystron-100KW Klystron drvien
triple diversity troposcatter system B4 the days of satellite took
over. Also worked on MW comm. system putting out 3-5 Watts from a small
Klystron. Long time ago in the late '50s-'60s.
I must work on the wrong units. The ones I've
repaired, have been bad diode (several), or
Christopher A. Young
Learn more about Jesus
It's the Magnetron. 9 times out of 10 that's the problem when it stops
You're all correct, I have no idea why I typed magnetron but was thinking
more along the lines of capacitor, yet even that's not always the case.
I'm just gonna keep my fingers to myself on this one and watch.
Most of the time the diode shorts or cap, or transformer shorts. I think
with no load, the transformer still sucks a lot of power. There should be
small resistance between magnetron terminals, on heater. Always discharge
cap !!! If it's simple like diode, replace part, but you will spend too
much on other parts except cap.
If yo want full info, check out science repair FAQ. Microwave ovens.
That is quite an article. It seems to have everything anyone would ever
want to know about fixing a microwave. I have not read all of it, but
I've already learned a lot.
One thing, the article has invalid links. I suppose they are old.
Both links here (Below) are obsolete -
*Microtech maintains a web site with a large amount of information on
microwave oven repair including an on-line
*Tech Tips Database with hundreds of solutions to common problem for
many models of microwave ovens. There are also an extensive list
Tec tips used to be very popular with things, like monitors, vcrs, etc.
I'll see if I remember to send Sam a note. All the mirror sites should have
the same edition, Including mine.
Epoxy paint should work well, with prep.
I've installed mechanical timers before. Some people like them better.
my microwave Numbers Panel Light went out
and I can see zero when it runs
[98% of the time. In the dark, I can see very faint numbers]
anything I can try to bring them back?
I really like this microwave. otherwise
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