Question about Microwave Ovens
Lights, turntable, fan, display work. Door switches O.K. High voltage capacitor's leads disconnected for testing. When I checked the discharged high voltage capacitor, I found that there was zero resistance between the terminals (the meter pegged, and stayed pegged). Same result when ohmmeter leads were reversed at the capacitor terminals. There was infinite resistance between either of the capacitor's terminals and the capacitor's can using a digital ohmmeter. Same results as above using an analog ohmmeter. Do those readings definitely indicate a bad capacitor? Are there other tests? I have only VOM's.
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Posted on Jan 02, 2017
Even though the magnetron passed the continuity tests, it can still be bad. In fact, most of them fail in ways that do not show up in continuity tests.
And I am 99% certain yours is bad, especially since you have proven that the filament voltage and high voltage DC is being produced and sent to the magnetron.
I must say that the testing you have done is not recommended for people without plenty of experience, but apparently you did it safely. Please don't press your luck, since the high voltage can be instantly lethal.
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Posted on Jul 18, 2008
this may not be the switch its self but its physical position in relation to the door acuator. either the switch needs adjustment or the door actuator or door itself. recommend certifed engineer advise on this problem.
warning: mircowave is a high energy, if doors are not seated correcly then energy may leak past door shielding and cause injury.
Posted on Nov 13, 2009
Microwave ovens use a series of micro switches to operate as interlocks to ensure the unit will only operate once the door is securely closed.
If these locks are not operating properly, the timer would count down just like it was operating. There will be no noise like the normal vibration or fan sounds when the start button was pressed. It will simply act like it will operate, but it will never turn on any of the components.
You would need to check these switches if they are functioning properly and would need the help of a qualified technician to test them. If you plan to do it yourself, Check if the switches are mechanically operating and that electrical continuity would change as it was actuated.
There will be at least three of these switches aligned so they close in a specific sequence when the oven door is closed.
This closure process is designed to prevent someone from just sticking something in to actuate the switch and run the microwave with the door wide open and becoming exposed to the microwave energy.
Two of the switches are in place to provide power to the units high voltage section and to tell the control board when the door has been closed. These are usually normally open switches.
The third switch is called the monitor and acts as a safety switch blowing the internal appliance fuse in the event any tampering is going on, and this one is usually a normally closed switch.
If you find the fuse inside your microwave is now an open circuit, check the monitor switch as it may be the cause.
Hope this helps.
Posted on Aug 19, 2011
SOURCE: Blown fuses
Well you certainly have done a lot of work on a microwave that is not worth the effort. When fuses blow and destroy other items ,it is time to junk it and up date. I have found that when something like what happens 9 times out of 10 it will be the magnetron or transformer either of which will be more than 1/2 the cost of a new machine.
Posted on May 18, 2013
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