Question about Sharp R-820BK Microwave Convection Oven, 0.9 cu. ft. 900W, Carousel turntable system: 12 diameter porcelain enamel 2-line, 12-digit interactive Display, Auto-Touch, Black R820BK R 820BK R820B R820 R-820B R-820

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Sharp carousel microwave convection oven keeps blowing fuse

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  • Sharp Master
  • 9,047 Answers

The service manual is here:
http://www.microwavedisplay.com/r820bc_bk_bw_sm.pdf

You can get Sharp parts from Encompass here.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
See http://www.microtechfactoryservice.com/cap_test.html

If it went dead several seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
See: http://www.microtechfactoryservice.com/xformer.html

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
See this: http://031d26d.namesecurehost.com/mwd/doorsw.txt

Posted on Sep 23, 2013

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Posted on Jan 02, 2017

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SOURCE: Sharp Carousel Convection Microwave R-9H56 suddenly stops heating

at highvoltage section wiring may bae problem, check wiring and connectrors of magnetron and capacitor and transformer.

Posted on Dec 12, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: R-4H84 Sharp Carousel II microwave oven stoped working

A microwave can be dead for many reasons.

The fuse is normally located on the floor of the chassis behind the control panel or between the door switches.

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

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.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

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 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 on 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 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 Jun 23, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: I need a manual for Sharp Microwave/ Convection R7A85

You can download that here free.

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

Posted on Aug 30, 2009

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Sharp R-820BK Microwave Convection Oven, 0.9 cu. ft. 900W, Carousel turntable system: 12 diameter porcelain enamel 2-line, 12-digit interactive Display, Auto-Touch, Black R820BK R 820BK R820B R820 R-820B R-820 Logo

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