A switch with 2 pins is a SPST switch (single pole single throw). You test for open and closed contacts.

A 3-pin switch is SPDT switch (single pole double throw). The terminals are labelled NO-COM-NC (normally open - common - normally closed).
You test for continuity from COM to NO or NC depending on the state of the switch.

 

The micro switches with 3 pins will have changover contacts. This means that in the non actuated position one pin (The common) will have continuity with one of the other two pins, (That pin is the normaly closed pin (NC)). The remaining pin will not show continuity to either the common pin or the NC pin when the switch is not actuated. This pin is called the normally open pin.(NO).
When the switch is actuated there should be continuity between this pin and the common pin. In the actuated state there should be NO continuity between the the common pin and the and the NC pin.

Les.

 

i can confirm that all 5 switches works fine.

 

@crutschow is that what you are saying depicted on that schema?
https://www.ebay.co.uk/itm/204650057660


View attachment 351896

Yes.
The diode across the capacitor is a protective diode.
The HV Diode in conjunction with the capacitor act as a voltage-doubler to give a negative high voltage at the the magnetron's cathode equal to the peak-to-peak voltage from the transformer secondary.

 

I have not read what are the symptoms for “partially working”.
Control panel lights up and functional?
Microwave goes through proper operational cycle?
Not able to make.warm water?

 

I have not read what are the symptoms for “partially working”.
Control panel lights up and functional?

correct

Microwave goes through proper operational cycle?

correct

Not able to make.warm water?

yes once the cycle is over - water is not warm enough

 

When you say "

When you say "water is not warm enough" Has it raised it's temperature at all ?
Les.






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When you say "water is not warm enough" Has it raised it's temperature at all ?

was running 1000W for 6min with 200ml of water. once program finished i measured water temp it was 34 deg

 

What was the temperature of the water at the start of the cycle ?
How much current is the microwave taking from the mains supply during the heating cycle and what is the mains voltage in your country ?
Les.

 

@LesJones
it was around 18-22deg

I will measure current with smart socket later - during the heating cycle - great point!
its 230V

thanks!

 

just odd question ... why is that magnetron such an expensive? I mean one can buy brand new microwave for 100e and that magnetron costs 200 euro+

also the is magnetron Toshiba 2M282H(L) which seems to be discontinued

someone advised its replacement is part listed on ASWO pn: #H626103
as i dont have access to AWS i am not able to find the brand/ mode.

Is it possible to help? thanks!

 

... why is that magnetron such an expensive? I mean one can buy brand new microwave for 100e and that magnetron costs 200 euro+

You're finding what I have found in the past, that you may as well buy a new microwave if your magnetron is shot. The manufacturers have no incentive to enable inexpensive DIY repairs. If you make magnetrons, you want to sell them by the thousands, a pallet at time, to whoever is assembling microwaves. You can make money shipping them one at a time but that's a very different business and you need a much higher margin to cover the overhead.

 

A magnetron is not expensive. The guys selling them are squeezing any wallet that can find to the maximum for you to pay their mortgage in a day.. I would put some neon bulbs or compact discs or aluminium foil confetti/strips, grapes, steel wool scrubber, on a stand-off like an inverted cup and check if there is emission of microwaves, sparks will tell yes.

Recently transplanted some guts of a free $0 microwave oven into mine, full success, now working daily better than when new. Many are found in dumpsters with perfectly canibalizable parts. Post #366 at :
----> https://forum.allaboutcircuits.com/threads/what-did-you-repair-today.194969/page-19#post-1984061

 

@Externet
its oven+microwave rpp 400euro time ago....

i was just wondering if even 100e microwave magnetron will costs 200e

 

hello
i finally replaced the Fuse all works fine ! thanks!

 

hello
i finally replaced the Fuse all works fine ! thanks!

Congratulations on a successful outcome.
Can you specify exactly which fuse was replaced?

 

Post #16...

 

that one on the circuit to the Transformer for magnetron
https://forum.allaboutcircuits.com/attachments/20250629_162008-jpg.351871/

@Externet question would be if one needs to analyze root cost or it just happened and all is Ok