Question about Sharp R-9H66 Microwave Oven

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Magnetron model blown located

I put what I thought was a plastic pouch of chocolate frosting in the microwave and it was 15 seconds before I realized it was sparking, and blew the magnetron tube. Mine is 15 years old; do they still make a replacement tube for it?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: magnetron tube and mica waveguide cover

Unfortunatey unless the unit is a high end oven by the time you pay for the parts and labor you could probably get a new one. Don't forget if you have to replace these parts already who knows what else is about to happen. I hope this helps you out.

Posted on Nov 26, 2008

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MicrowaveSvc
  • 9047 Answers

SOURCE: Sharp R-420AC microwave blown fuse.

Here is a link you or someone you know can use to test it, but please read the safety info:

http://www.gallawa.com/microtech/cap_test.html

The best place to order parts for this brand is Encompass (formerly Tritronics).

Or you can call them toll-free at 866-779-5835.


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

Posted on Jan 10, 2009

EwingElect
  • 276 Answers

SOURCE: Paint damaged in side microwave oven

1) How is the cavity damaged? Is it just peeling paint, or is it rust? If it's rust then the microwave could be dangerous.

2) The antenna cap usually has a small hole in the centre, but if there are any other holes in it the magnetron itself could be damaged, and holes caused by the magnetrin arcing.

Posted on Mar 25, 2009

  • 4090 Answers

SOURCE: there is sparking from a small metallic plate

Sparking in a M/wave is a problem as it can damage the works. Not sure what the plate is you speak of, Generally all metal objects are painted with enamel to prevent sparks. The humming is a worry though as it indicates something not functioning correctly in the Magnatron which is a large transformer like object. M/waves are not as expensive as they once were and can be picked up second hand under warranty from cash exchange places for about $30 onwards. I recognise that even that is an expense you dont want, but to continue to try and use a sparking MW is dangerous and is often not worth the money you spend on repair, against a used or refurbished one with a warranty.

Sorry I cant come and take a look for you ( I am in Australia) and help you out any further. But my advice is if you cant fix it yourself easily, Ditch it and replace it with a used one.


Posted on Sep 24, 2009

MicrowaveSvc
  • 9047 Answers

SOURCE: Sharp Carousel R-1480 doesn't heat

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Accessing some components for testing and possible replacement will require you to remove the oven from the wall.

If so, the installation instructions (similar to these) are very handy, and it's best to have two people since the microwave can be heavy and awkward.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted, it's probably okay)


http://www.gallawa.com/microtech/mag_test.html
(even if the magnetron passes these tests, it can still be bad. If you have high voltage and the diode is good, assume the magnetron is bad)

You would have to remove it from the wall to replace the magnetron, take off the outside cover, discharge the capacitor, then disconnect the magnetron's wires and mounting nuts.

We have the service manual for this model and have uploaded it for you here.

(Our site is down as I write this, but rest assured it is there.)

You can order parts for this brand from Encompass here or you can call them toll-free at 866-779-5835.

Most manufacturers can offer a "drop-in" replacement if you tell them your model number. Call Sharp toll free at 1-800-BE-SHARP (1-800-237-4277).

NOTE: FixYa's Web site is currently not notifying us when replies to our Clarification Requests are posted.

So please reply back directly to me with your brand and full model number from the tag in or on the unit for more help or free do-it-yourself tips or an estimate if required.

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

Posted on Sep 28, 2009

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My under cabinet microwave is not working correctly.


The possible reasons are: 1) The high voltage transformer is broken, 2) The magnetron is broken.

For the 1st problem, no power can be applied to the turntable.
For the 2nd problem, the magnetron is broken with no microwave can be issued.

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Your full model number would be either GH6177XPS1, GH6177XPS2, GH6177XPS3, or GH6177XPS4 as found on the model tag. I mention that only if you need to order parts.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

mini_manual_behind_grille_small.jpgdee77f7.jpgAt our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

On the tech sheet for our model, trouble code F7 is discussed:

F7 Power to magnetron interrupted

1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Unplug microwave oven or disconnect power.
4. Check cooling fan operation
5. Check resistance of the magnetron thermostat.
6. Check the magnetron.
7. Check P2, P4 and P27 connections.
8. Check wiring to the 1100W inverters and control system. See "Checking Inverters."
9. Check operation of all interlock switches.
10. Replace inverter, if defective.
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14. Replace electronic control.
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You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

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

Sep 07, 2012 | Whirlpool Microwave Ovens

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The fuse blew on my emerson microwave oven and I replaced it. This fuse has now blown. What would be causing this? Thanks....Lee


Usually what happenes is the magnetron is dead, or is dieing. It is using too much power due to overheating, or it is just worn. This is a common thing for older microwaves. take the case back off, and clean the fins on the magnetron this will fix the overheating problem. Be careful. let your microwave sit for about an hour after being plugged in. This lets the capacitors that store dangerous voltages leak off. also make sure the new fuses are ceramic fuses that are rated for 15 amps at 250VAC Do not use glass fuses! You can find a new magnetron on ebay, or on the internet some where. You will need a DAEWOO 2M218H MFI magnetron. I just tore my microwave apart, and realized I have an exact replacement for it. I just swapped them out and they both work. cool. but yeah. that's what is most likely causing it. Good luck!

Sep 17, 2010 | Emerson MW8985W Microwave Oven

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Run empty microwave


Chances are the thermostat or thermal cutout that protects the magnetron is such cases is blown.

Let's just hope it did its job and prevented the magnetron from being destroyed by running empty.

We would need to know your brand and model number to give you more specific help, but FixYa's Web site is currently not notifying us experts when replies to our Clarification Requests are posted.

So you will need to make a new post with your brand, model, (country if not USA) and specific symptoms.

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

May 26, 2010 | Magic Chef CMV1100 Microwave Oven

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Everything on our microwave still works( Clock,lights, fan) except it will no longer heat anything you put in it


HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

Oct 12, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

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Maytag Microwave model MMV5165BAS. Doesn't heat


HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

Sep 10, 2009 | Microwave Ovens

1 Answer

Microwave may have overheated


There are two thermal protectors which may be blown. If so, it will measure open (infinity) instead of closed (zero ohms).

One is located on the magnetron and one is on top of the oven cavity.

(There is also one located on the floor / base of the microwave but that one's not at issue.)

The magnetron thermal protector *may* be accessible by removing the control panel, but to access the oven cavity thermal protector, you will have to remove the oven from the wall.

If so, the installation instructions here are very handy, and it's best to have two people since the microwave can be heavy and awkward.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

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

Jun 23, 2009 | Goldstar MV-1515 Microwave Oven

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Microwave turns off after 10-15 seconds.


Make sure you hear the fan is still operating in your microwave. Next is to make sure the air intake grill on your microwave is not plugged up with air borne dust and dirt.

also.
for heating problem
Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay

Nov 09, 2008 | Panasonic NN-P794SF Microwave Oven

1 Answer

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Due to running empty, the magnetron has overheated and the thermal cutout also called a (TCO or thermal fuse) or thermostat (if so equipped) on the magnetron has blown.

After 15 minutes of such stress, I would suspect the magnetron is gone, too, unless the thermostat / TCO stopped it in time.

Cross your fingers...

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.

You can usually find exploded views and order parts by entering your full model number at the Sears parts site.

A full Sears/Kenmore model number usually has 3 digits, a dot, then 8 more digits, such as ###.########

There may 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.

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

Aug 13, 2008 | Kenmore 63793 Convection / Microwave Oven

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Sharp Microwave oven magnetron blown or faulty


You can e-mail the spare parts manager with your model number here: JHB023@seartec.co.za

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

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