Question about Sharp R-1480 Microwave Oven

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Sharp Carousel R-1480 doesn't heat

I have been browsing the web, and all the information I read points to a bad magnetron.

Question1 :
How does one replace a magnetron?

Question : If I just want to replace my current Microwave is there another model that has the same dimensions? [it is a built in Microwave]

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  • 9,179 Answers

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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How can I tell if the magnetron that was removed from my microwave is really bad?


That is a difficult question to answer, the magnetron would need to be tested to find out if the item is functional or not, do you see a part number on the old magnetron or date when it was assembled. Did the technician replace any other parts besides the magnetron, any information would be helpful.

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Unplug the microwave and discharge the high voltage capacitor, you will see two wires hooked to the magnetron, unhook one side, set digital meter to ohms "lowest setting" touch the test probs on the two points, if readings are well below 1ohm "usually .1 to .2 the filiment of the magnetron is good, but if no reading, the magnetron is open and there for is bad.

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Check the capacitor with an ohmmeter, if the meter reads 0 ohms the capacitor is bad and needs to be replaced. More likely, though, the magnetron is bad.

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The microwave stopped heating. Everything else is working fine.


GE MAGNETRON REPLACEMENT

With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.


The diode is a fairly cheap fix, and your magnetron is still under the part warranty, but you would have to pay labor.

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.

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.

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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.

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 or burned, it's probably okay)


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

Since it's within the magnetron portion of the warranty (5-9 years) but out of the original full warranty (1 year), G.E. will cover the part cost, but not the cost to visit you or the labor charge to do the work.

Sometimes they will send you the magnetron to do it yourself.

If nothing else, you can save about $50-75 if you remove it from the wall and take it to a GE-authorized servicer.

You can find a GE-authorized servicer by calling GE Appliance Service at 1-800-848-7620 or here.


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

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

You can download GE owner's manuals and installation instructions here.

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

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Then the most likely suspects are:

- loose / corroded connection at the magnetron terminal
- bad magnetron (may buzz or hum, may not)
- bad high voltage transformer (may smell / smoke, may not)
- shorted high voltage rectifier diode (may hum, may not)

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa.

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
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html
If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

If you want to find a local Sharp-authorized servicer, visit http://www.sharp.co.uk

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

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Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

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

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

http://www.microtechfactoryservice.com
http://www.microtechfactoryservice.com/cap_test.html
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html


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

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Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

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

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

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

Mar 12, 2008 | Microwave Ovens

1 Answer

Microwave Problem


I would say it's most likely a bad door switch or switch mount or a bad connection on the magnetron or a bad magnetron.

But generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose conneciton on the control unit circuit board
- bad magnetron or other high voltage part

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

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