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Maytag MMV4205AAB Microhood fuse replacement  Rate Topic 
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 Posted: Thu Jan 18th, 2007 05:53 pm
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ACder
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 Had a power surge.  Now microwave sits lifeless. I'm assuming it's an internal 20 amp ceramic fuse?  If correct, how do I get at the bugger-  Do I have to take the microwave/hood down and dissasemble it or is there a way to do it with the unit in place?

 

Thanks! 
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 Posted: Fri Jan 19th, 2007 01:09 am
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That Guy
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 First unplug the microwave. Then remove the two small screws that hold the top grill on. I usually loosen the other screws a little too. Now you shuld be able to remove the screw that holds the controll panel on. The panel should slide up and hinge towards you. Behind it (somewhere) is the fuse inside the fuse holder. Just be extra careful in there. The capacitor can store 2000 volts for a long time and you really don't want to make contact with it. Good luck.

 
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 Posted: Fri Jan 19th, 2007 11:44 pm
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ACder
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 Thank you!!!!!!
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 Posted: Sat Jan 20th, 2007 03:02 pm
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ACder
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 I replaced the fuse-nothing.  There is power to the outlet-what next?  Thanks!
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 Posted: Sat Jan 20th, 2007 03:11 pm
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Chat_in_RI
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 Then either the Oven Thermostat or M.G.T. Thermostat is open per the wiring diagram. Should be a copy located inside the microwave somewhere.

And, as That Guy pointed out, be extra careful in there...

Last edited on Sat Jan 20th, 2007 03:15 pm by Chat_in_RI



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 Posted: Sat Jan 20th, 2007 03:31 pm
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ACder
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 Thank you.  What should I look for and do when I find these items?
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 Posted: Mon Jan 22nd, 2007 09:27 pm
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kwantlenappliance
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  Do you have any display showing? If you had a power surge there is a very good possibility that the varistor (MOV) located on the fuse assy/electronic noise filter has blown. This is the device that protects your electronic control board from surges. Take a look at the items on the fuse board assy - probably a red-coated or in some cases blue disc about the size of a dime/quarter - this is normally open but shorts out when power surge. They usually self destruct and some burning should be noticed. Hope this helps.
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 Posted: Mon Jan 22nd, 2007 10:23 pm
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That Guy
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 It could be a varisitor, but more likely something else is out. I would find out which wires feed 120 volts to the board/computer. Then check for voltage there. If you have voltage up to your board/computer and the display is still out, then you have a bad computer. If you have no voltage, then you have a bad part somewhere between the computer and the cord.
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 Posted: Tue Jan 23rd, 2007 01:38 pm
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ACder
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 No display, no nothing.  I will try to check the items noted above and post back.  
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 Posted: Tue Jan 23rd, 2007 04:57 pm
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kwantlenappliance
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 Here's the schematic and a troubleshooting guide to your problem. As you can see you need to verify power at the connector between 1 & 3 on the board.

Attachment: MMV4205 diagram.doc (Downloaded 12 times)
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 Posted: Tue Jan 23rd, 2007 06:15 pm
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ACder
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 Thank you so much!  There is power where you indicated-so the control panel is fried?  If so would my only option then would be to replace the circuit board-control board?

P.S. this was a strange voltage/power surge-it fried various items like the microwave and furnace/boiler controls and left others untouched.  So far it's been $1000.00 to repair the boiler controls (Weil-Mclean) so I am trying to save a few bucks if I can by fixing the micro.

 

thanks again!!!!

Last edited on Tue Jan 23rd, 2007 06:40 pm by ACder
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