Question about KitchenAid KHMS145J Microwave Oven
Hi and welcome to FixYa. I am Kelly.
Most of the time when the microwave is in use and just quits either the Power Diode or the capacitor has failed and blows the fuse inside the cabinet. (Yours is probably NOT blown.)
Location Item 19
Capacitor: (Location Item 20 above link)
Since you unplugged the unit before the thermal fuse blew you were very wise: (Item 28 of interior diagram)
With the unit unplugged and the chassis cover removed the fuse will be located at the end of the power cord lead in a fuse holder. The fuse is usually a 15A 250V slow-blo fuse. Just replacing the fuse will normally result in the fuse failing yet again.
STOP! Before going any further you must hold a well insulated screwdriver back on the handle and short across the High Voltage Capacitor at least 3 times! Failure to do so could be the start of a very bad day in the form of a horrible shock.
Next you disconnect one side of the cap including the power diode wire. With an analog meter set on R x 1,000 read the Cap terminals watching for a jump. Reverse the meter leads on the terminals and watch for a jump EACH time you reverse the test leads on the CAP terminals.
No jump = bad cap.
Constant resistance across the cap = bad cap
Lastly you check the power diode with the meter on the same settings R X 1,000. One direction will read full continuity (ZERO) and reversing the leads will read infinity. (no reading)
If the diode reads open both ways = failed
If the diode reads (ZERO) both ways = failed
It must read continuity in ONE direction only.
After finding and replacing the failed component then you can change the fuse and test the microwave.
There is a very very remote possibility that a door switch has failed but given that your microwave failed while in use I seriously doubt you have a door switch problem.
As far as finding replacement parts for your microwave nearly every appliance parts store will have what you need if you walk in with the failed part in hand. Most of the time they will walk back and grab the part you need without even digging in the parts books.
These are the most common failures when a unit quits working while in use. Yes I believe your unit is repairble at a very reasonable cost.
Thanks for choosing FixYa.
Posted on Sep 01, 2010
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
May 02, 2012 | Sharp Microwave Ovens
May 31, 2017 | Panasonic NN-C980 Convection/Microwave...
Dec 08, 2010 | GE Microwave Ovens
Nov 27, 2009 | Kenmore 80412 Microwave Oven
Jun 04, 2009 | Microwave Ovens
Jan 18, 2009 | Dacor DMT2420SS Microwave Oven
Oct 05, 2008 | Whirlpool MH7130XE Microwave Oven
Feb 28, 2008 | Microwave Ovens
Jul 26, 2007 | GE JVM1860 Microwave Oven
96 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: