This could be the upper latch in the door. Mine stopped working just as you describe. After dis-mantling I noticed the mechanical action which should operate 3 micro-switches in the door lock was not working correctly on the upper switch when the door was closed.
This is part of the safety interlock circuit to prevent operation of the magnetron when the door is open.
Closer inspection of the door striker arm revealed a crack which allowed the top part of the arm to spring away from the upper switch which stopped the oven working.
This part is easily removed by prising the door inner trim off gently, starting at the bottom was easiest for me, then sliding the arm up against the spring tension until it slides clear of the guide grooves, finally detach the spring.
I have no idea where to get spare parts for this ASDA only branded product, so I am going to use super strong epoxy resin to repair the striker arm.
SOURCE: Jenn-Air Microwave M169B 11 years old.
You should be able to get a replacement keypad, and that's not a hard job for a DIYer.
If you're interested, post your correct brand and model and I'll give you a more specific suggestion.
(Your post subject says Jenn-Air M169B put it's posted under Sharp R-316FS so I'm not sure which you have).
If it's a Jenn-Air, you can usually find helpful exploded view diagrams
and order parts by entering your full model number here:
http://tinyurl.com/gv383
You can usually find Sharp exploded views by entering your FULL model number here: http://www3.sears.com (the 3 is correct)
You can order Sharp parts from there or from Tritronics at http://www.wehaveparts.com
We're happy to help and we appreciate your thoughtful rating of our answer.
SOURCE: Light, fan and timer work but microwave does not
Microwaves are pretty much a non repair item. It will cost you more to fix than it would to replace.
SOURCE: There is no indication that power is getting to
The power from the plug to the main unit- the board must be checked. So you will need to remove the top panel to check, disconnect power and use a multimeter to check the fuse, power to the main board.If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Now keeping clear of the microwave, switch on, use a cup of water inside to test.
Check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if contact is not through the microwave will not work.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is heating without any issues, you can use the microwave safely
The power from the plug to the main unit- the board must be checked. So you will need to remove the top panel to check, disconnect power and use a multimeter to check the fuse, power to the main board.If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
Check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if contact is not through the microwave will not work.
Now keeping clear of the microwave, switch on, use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is heating without any issues, you can use the microwave safely
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