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SHarp R-9H84B Microwave with Convection

Last night my microwave shut down completely. I had been using it without incident for the evening meal. I stopped the unit with 20 sec remaining in a warming cycle using the 60sec button. When I pushed the stop button to clear the remaining time, the entire unit shut down and all displays went dark. The unit will not revive even after unplugging and replugging. I checked the master electrical circuit panel to insure the outlet has power and all is fine there. I understand that there may be a fuse that can be user serviced. I have an electronics background if it needs more than the average user. We have enjoyed this unit since 1996 without incident; however, in this past year I have noticed a different sound as if the unit begins a little slower and then gains speed. It has not made a difference in performance. Could this be a failure of the Magnetron?

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  • jld1109 Nov 30, 2008

    MY UNIT SHUT DOWN DURING USE AND WILL NOT START AGAIN. IT IS COMPLETELY "BLACK". i HAVE CHECKED ALL EXTERNAL POSSIBILITIES AS WELL. NO LUCK. PLEASE LET ME KNOW, AS WELL, IF ANYONE HAS ANY SOLUTIONS OR SUGGESTIONS. THANK YOU.

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  • Microwave Ovens Master
  • 22,687 Answers

I suspect a door switch firstly followed by the diode pack, magnetron and capacitor. One or a number of these things has taken the internal fuse situated on the mains input panel near where the power cable enters.
BE VERY CAREFUL lethal voltages exist inside and not just mains voltage, many times greater!

Posted on Mar 13, 2017

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Posted on Jan 02, 2017

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mindreader
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SOURCE: Sharp microwave suddenly died !

The high voltage transformer that feed the klystron tube usually has a cartridge fuse on its 110 v side.

YOu will have to remove the case to access the electronics... the screw should be obvious...

Note.. you are handy- so the obvious (unplug first) and the even more obvious - keep fingers and metal away from all capacitors in the power supply area.

Posted on Oct 22, 2009

heatman101
  • 43501 Answers

SOURCE: Need part # for magnetron

Hi,
Here is a tip that will help you with the online buying...

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heatman101

Posted on Apr 22, 2011

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Here is the parts page for your unit with an exploded view and parts list

http://www.searspartsdirect.com/partsdirect/part-model/Sharp-Parts/Microwave-Parts/Model-R-9H84B/0958/0123245/P0050209/00001 It is possible the switch is bad the look at part number 1-6 hope this helps.

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That model had 900 watts of microwave power output, and the convection outpout was 1450 watts.

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They aren't cheap, but I found them here:

http://www.repairclinic.com/PartDetail/Glass-Tray-Drive-Coupling/1266724

I was looking because after 15 years, my drive coupling cracked out where it connects to the turn table motor. Getting it out isn't that difficult - just remember to unplug the oven before you work on it. If the old coupler won't come out with gentle and even prying, flip the oven upside down - there is a small door on the bottom help shut with a single philips (+) screw which will give you access to the motor. Remove the two philips screws and lift the motor out and then use your screw driver to gently encourage the coupler out. I found removing the motor was the easiest way to install the new coupler - install the coupler then the motor while holding the coupler in upside down. I have the model with the door opening like a conventional oven door and it will not want to stay open for you while the oven is upside down. Either have some one hold it open while you have an arm in there or be prepared to have your arm squeezed a bit.

Cheers,
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It's almost certainly a bad turntable motor.

The part number was RMOTDA079WRE0 but it is listed as no longer available.

In some cases, older microwaves are available locally at repair shops or on Craig's List.

If you want to keep your eyes open, this same motor was used in the following Sharp models:

R9A20
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R9H83
R9H84
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Good luck.

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

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There are a couple of safety thermostats in the oven to shut down power if something overheats. One is on the magnetron tube (the microwave source), the other is on the cooking cavity. These sometimes go bad. There's also a power line fuse that may have failed, or become loose in its mounting clips. These can be tested with an ohmmeter; they should all measure very close to zero ohms if they're good.

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Microwave servicing is best left to professionals. If you're thinking of keeping this one, take it to a service shop (or call for home service) and get an estimate. Then decide whether to repair or replace.

Hope this has helped a little. Thanks for using Fixya!

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