Location of monitor switch for Sharp R-5A54B microwave
The fuse blew on my Sharp R-5A54B. I replaced it and it blew again. The sticker next to the fuse says that when replacing a fuse you should also replace the monitor switch. Can someone tell me which of the three switches this is?
Re: Location of monitor switch for Sharp R-5A54B...
The monitor switch is the middle switch. It is manufactured by omron and is a common type cherry switch. The omron part # is V-16G-2C25. The switch is a bottom type common terminal position with the contact form being a SPST-NC. Test the switch first with an OHM meter. Open the microwave door and you should have continuity between the two terminals. close the door and the continuity should be gone. P.S. The fuse may be purchased at any radio shack for about $3.00 pack of 4. their cataloge # is 270-1040 GOOD LUCK!!!!!!!!!!!
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I am wondering which fuse is blowing?
There are at least two fuses fitted internally and in the UK at least another fitted in the plug of the supply lead.
It isn't wise for an unqualified person to replace the internal fuses of a microwave even if it is switched off as there is a capacitor inside that is capable of storing a dangerous amount of energy.
The reasons why a fuse blows is either because there is a poor connection close by that is generating a lot of heat or the the fuse rating is incorrect or of the wrong type (quick-blow instead of slow-blow) or the appliance is consuming more current than it should be.
Microwave ovens have a fairly simple working principle and there aren't many things to go wrong. When things do start to go wrong or components become tired it is usually translated into a loss of efficiency that can be measured by how long it takes to boil a measured quantity of water, for instance.
Periodically timing a measured quantity of water to boiling point is a good way to monitor the performance of a microwave and when efficiency falls significantly take it to the service shop before something destroys itself and causes more damage.
In my limited experience the magnetron could be failing but the internals of a microwave should remain a mystery to the unqualified.
I hope this helps a little.
Hello, there is a component that is pulling more current than it needs to be. I
would check the microwave HV diode there could be some leakage to ground. Also,
the mega-tron tube might not be working the way it should. If the mega-tron tube
is going out. Just replace the microwave oven. It is to cost prohibitive to
replace the mega-tron.
If you replace the microwave oven. Please recycle your old microwave. Boy
Scouts, recycling centers, some charitable organization will recycle.
The fuse is connected directly in series with the monitor switch. If it senses one of the door switches bad it will blow the fuse, this is there as an added safety to make sure the oven will not work without the door closed.
There are usually three and sometimes four door switches just inside and to the left of the control panel that are activated when the door interlocks with them. One of the switches is most likely bad. Typically it is the primary interlock which is on top. It can be checked with an ohmmeter, usually you can see it broken as the plunger will not go down or come up like the others.
The door latch switches, and monitor switch assembly needs adjusting. With the door open the two latch switches should be normally open,and the monitor switch closed. Opposite way when door is closed. MAKE sure oven is unplugged before testing