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Sharp Microwave Model R-1471A

Loss of Power

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A microwave can be dead for many reasons.

You can find a wiring diagram for model R1471 at our site:
http://207.234.249.73/mwd/r1470_wiring.jpg

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again. If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Mar 30, 2008

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Loss of power

Posted on Nov 26, 2008

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6ya6ya
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Posted on Jan 02, 2017

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User manual for a model R-209 AK counter top carousel microwave


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See if other electronics is acting funny since the power loss... you could CLAIM the damage from the insurance company

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If it still fails, it may be that the keypad has failed, or there is a bad connection due to moisture, grease, etc.

This is an Australian model, so it's hard for me to give more specific information.

But one some US models the LCD and keypad connect to the circuit board via a rubber "zebra strip" and losing that connection can result in a loss of display segments and / or key response.

I've attached a diagram showing where one can clean to restore operation in this case.

a98b491.jpg

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

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Sounds more like the transformer could be bad. Very easy to check. See my tip at http://www.fixya.com/support/r4318968-check_high_voltage_transformer_in . Let me know if you need more help.

hardrocko

Thanks for using FixYa and for the generous rating.

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your fuse holder appears to be behind the control panel area. you may be able to just remove the grill above the door and control panel to access the screw that holds the control panel in place, then swing that down and see the fuse and holder.
you may however need to lower the unit from its mounting place to remove the outer cover to access this fuse..
hope this helps,
best of luck,
ttfn

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