Question about Sharp Microwave Ovens

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I have a Sharp microwave model # R-9h94b. worked great until this morning. no light or power to electronic board. I do have power to the unit. Is there a reset button or a way to check the electronic board. I have basic tools and some knowledge to trouble-shoot the unit. Need some help. you can call me at 270-236-3451 collect if you wish. Thanks

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There is probably a fuse inside the cabinet of the microwave that has tripped or blown. I would take the cabinet off and look for a fuse in the line side of your incoming voltage or trace power with a multi meter to see where it stops. Start with the door switch. Be very carefull as the capacitors in some microwaves pack a big punch if you know what I mean.

Posted on Feb 03, 2010

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Posted on Jan 02, 2017

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What causes microwave to blow new fuse?


The only thing inside a microwave oven that draws enough current to blow a fuse is the magnetron that generates the microwaves to provide the cooking power. Based on the age of the unit (approx 15 years) it is most likely best to just replace it as repairs at that level are not cost effective. Newer units cook better and faster using less power these days.

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I have a GE micro ange hood Model# HVM1540DM1BB, bulbs blew,change them out, now the lights will not shut off. I have powered it down over night, pluged it back in next morning same thing. Any ideas


There is a possibility that the light relay is stuck on. Sometimes a sharp tap on the relay will fix it. If not the control board will need replacing.

Sep 26, 2014 | GE Microwave Ovens

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No power dead


power outages cause power surges and will damage electronic control boards. I suggest replacing the Control board and checking the interlocking door switches. Whilst inside the microwave check the magnetron for discoloration around the magnetron horn or gun as it were. If it don't look clean and new, otherwise burnt it's bad !

Feb 06, 2014 | Sharp Microwave Ovens

1 Answer

EM-G5596V Sanyo Microwave - Start button does not work


MY KIDS WERE USING THE SHARP MICROWAVE R-9H94B FOR A TIMER WITH NO FOOD IN IT. IT NOW DOES NOT WORK AT ALL. IS THERE A FUSE OR A QUICK FIX TO THIS?

Jan 01, 2010 | Sanyo Microwave Ovens

1 Answer

R-8350, No power to touchpad, but interior light works


The touchpad has its own fuse which has probably blown due to a surge perhaps related to the turning on of the fridge. Removing the cover from a microwave is potentially lethal due to the large capacitor to drive the magnetron. However, this is usually well away from the front panel. If you do venture in you should first unplug the unit and when the outer cover is removed, discharge the large capacitor with well insulated pliers -= otherwise keep well away from it. The fuse you are interested in is on the pc board behind the touchpad. Replace it with exactly the same fuse (usually a slow blow fuse).

Sep 22, 2009 | Microwave Ovens

1 Answer

Microwave won't work. The time is frozen, buttons dont work.


I have over 20 years experience with microwaves and over 25 with all other electronics, and I'll have to say it sounds to me also like some kind of power surge "scrambling" its "brains".

Or possibly its power is being interrupted for a fraction of a second and having the same effect.

A microwave should really be on its own circuit breaker.

Microwave ovens, refrigerators, toasters, and electric ovens are very high current devices.

There are power line (mains) surges created when they cycle on and off.

If the microwave can't be on its own breaker, then maybe you can try a power strip with a surge suppressor, or better yet, a power strip with a surge suppressor and a built-in noise filter.

Or it may be that there is a subtle bad connection on the circuit board or at the fuse holder.

These kinds of problems are difficult to diagnose, and even harder to do remotely. Especially since I'm in the US! *grin*

I would strongly suggest that if you can't cure this with a surge strip or similar, please carefully document when and how it fails, then while it is in a failed state, open the door (to keep it from starting on its own) and call Sharp customer service at 1300 13 50 22.

Or you could visit here and click on Service Centre Location search.

You should have a one year warranty, so you should get in touch with a Sharp-authorized repair center.

An over the range type will include home visits in the warranty, but not if it's a counter top model.

You'd have to take that type to the shop yourself, and of course that would mean unplugging it, which would reset it, and the repairman may never see if fail.

If you wait too long, your warranty will be expired, so I'd get in touch with the shop.

Good luck.

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

Dec 01, 2008 | GE XL1800 1100 Watts Microwave Oven

1 Answer

Sharp microwave


That's a UK model.

The solution is to have your control unit repaired. In most cases, a shop will just replace the whole control unit, but they are likely to fail again without our proprietary modifications.

We repair those mostly for US and Canadian customers, but in the UK you can contact Quality Electronic Repairs. I think they repair these.

We occasionally have customers from the UK and Australia send theirs in for repair (not just board replacement) but the extra shipping charges may be a bit much for most customers.

Quite often, a customer will send their old defective board, unit then swap it when we send it back.

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

Nov 07, 2008 | Sharp R-1405 / R-140 Microwave Oven

2 Answers

GE Spacesaver microwave model: JVM1653sf001


It could be the Magnetron. First, If the unit is out of warranty, you can try to remove the rear cover (make sure unit is unplugged) and see if there is a blown fuse in the section that powers the Magetron. If all the fuses are good, I would suspect a faulty Magnetron. The Magnetron is the microwave tube which makes the food cook. They are not too difficult to replace. MCM Electronics sells them and you can call them with your model and they can find a replacement for you will be able to see how much it will cost.
http://www.mcminone.com/search.asp?keyword=magnetrons

1-800-543-4330

Good Luck,

- Jim

Jan 24, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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