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From what you are saying with the loud humming noise .
I would suggest replacing the capasitor and the diode .
the diode .Number(NNN) NNN-NNNN$4.07 capasitor(NNN) NNN-NNNN$38.97
items 19 and 20 http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=KHMS155LSS4&productC ategoryId=0123370&brandId=0593&brandDescription=KITCHENAID&modelName=MICROWAVE-HOOD-COMBO&diagramPageId=00003&componentDescription=INTERIOR%20AND%20VENTILATION%20PARTS&documentId=W0601206&blt=06
Whirlpool makes and owns Kitchen-Aid. the only thing differant about the two is just the name and the price.
The cap or diode being bad makes the tranformer (load up) Strain.
yes the unit has to be taken down and have the outer Wrapper (cover) taken off
Yes would be better to repair then replace.
and no other parts will cause the humm we call it a GROWL.
yes you can.
Just turn power off and on the terminals of the capasitor ,just go across one of the terminals to the capacitors grounded chassis.
Hi, Ok as per our convo on 12/29 I ordered the H.V. Capacitor & Diode as you sugested from Repair clinic. Installed both parts and my Microwave does the exact thing it did before........( Makes a Loud humming/vibrating sound when turned on -- see above in original post for make, model & original questions) so my guess would be that it was not either of those parts as the same problem still exists ( no heating & loud humming/Vibrating noise when running) so do you have any other suggestions on this before I send back the H.V. Capacitor for a refund??? If it would help i could upload a YouTube vid so that you can hear this for yourself otherwise I am going to call it a loss and send back the parts & purchase a new model which I was trying to avoid........please let me know what you think as I have the microwave all apart & am trying to decide which way to go on this. Thank You Alan
I my 30 year of service if you have a loud growling/hum it is either the cap or the diode ,
Make sure you installed the diode terminals properly on the cap and the ground screw is tight.
to test the Magtube pull one of the terminals off and run it to see if the hum is still there .
Ive never seen a mag tube make a humming noise ,but you can test it if you want .
If you have a loud noise I can`t see it is a high voltage transformer issue or it would not even make a noise at all.
Hi, I took Pictures before I removed anything then installed the Diode & H.V. Capacitor. Both were installed exactly as they were originally. I rechecked the both ( Diode Ground Screw & it was tight as was the strap screw holding the HV Capacitor) Now the only thing I didn't do was re-attach the wrapper/Cover when I tested it because I didn't want to put it all back together & have a Problem ( didn't think that would matter seeing that it was not attached as a direct ground or anything. ) but let me know if for some reason that would be a problem. I will pull a wire off the Magtube as you suggested and see if the humm stops ( doesn't matter if red or white wire right? )
Thank you fro the video ,it sounds like the transforner is loading up .
And this is the same noise you have when the wire is on the magtube correct?
here is the link to the transformer