Question about Amana AMV4204A Microwave Oven

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AMV420AA Microwave Oven will intermittently display 77:77

Microwave will display77:77 push power level or start on screen. when numbers are coming on screen it beeps each time. then it may clear itself independently and display the same thing again. Sometimes it will not stop. When i open the door and then hit stop, it erases, but will go back to doing what it was doing. Occassionally, it will not let you erase the numbers. i have turned the machine off for a while...unplugged it. It will go days without doing this or perhaps months...could a neighbors video machine be interfering?

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It sounds like the "7" pad on your keypad is shorting.

If you (or someone you know) might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

If you would like to have us do this for you, we do that for $39.95 plus part costs.

Please feel free to contact me directly if you need more help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Posted on Aug 03, 2008

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The microwave oven may be provided with a self diagnostic routine that can be operated

through the touch pad keyboard. To enter the self-diagnostic routine:

1.While pressing the CANCEL keypad:
a) Open the oven door.
b) Unplug the microwave oven for 2-seconds and plug it back in.
c) Release the CANCEL keypad and close the oven door. You will see the following display.

CHART
NOTE: The humidity sensor test results will appear on the display after 8-seconds.If the tests are successful, "OK " will be displayed. If one or more of the tests fail, "ERR " will be displayed.. 2.When a keypad is pressed, a number according to the test chart will be displayed. When no keypad is pressed, a blank "O" (square) is displayed...

POWER FAILURE & FAILURE CODES
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Then you unplug the keypad (as per the photo below), take out the defective board and install the new one.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

34374fd.jpg

Some connectors on the relays may have a lock:

positivelock.jpg

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These kind of things are generally trial and error and there is no guarantee that this will be the solution to your specific problem..

Hope this helps...

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WHAT IS WRONG WITH YOUR MICROWAVE?

small_6_37.jpg For a detailed Microwave illustration, click below.

redarrow.gif Counter top
redarrow.gif Built in
Danger! You can receive a serious electrical shock from the components inside your microwave oven--even when it's unplugged. Only a qualified appliance repair technician should perform any repair.

It doesn't work at all
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hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE;

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