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Sharp microwave carousel R330J 1100 watt. When the heating cycle is started the microwave light flickers on and off and there is a clicking sound. Initially high voltage fuse blown. replaced fuse and diode, checked capacitor. Fault still present even after disconnecting power to magnetron.

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  • Vacuums Master
  • 3,740 Answers

Hi and welcome to FixYa. I am Kelly.

1st the model number appears to be incomplete. Not an issue at this point but will be if you need parts.

You most likely have an interlock problem with one of the 2 door switches or the door interlock mechanism is broken.
There are 3 safety interlock micro switches activated by the door. One for the light, one for the Magnetron and one for the control panel power. If the problem persists with the Magnetron disconnected. The Magnetron safety interlock micro switch is supposed to blow the fuse if the unit is energized with the door open. Check continuity of your door interlocks. Pat particular attention to the NC (normally closed), C (Common) and NO (Normally Open) contacts.
NC should read to C and when the switch is activated read open at which time the NO contact will read to C.

I really suspect a bad microswitch.

Thanks for choosing FixYa.

Kelly

Posted on Aug 21, 2010

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Posted on Jan 02, 2017

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I NEED TO FIND AN OWNERS MANUAL TO R308NWW COUNTERTOP MICROWAVE.


Here is a direct link to the Owner's Manual for your Sharp microwave oven:

http://files.sharpusa.com/Downloads/ForHome/HomeAppliances/MicrowaveOvens/Manuals/mic_man_R307N_308N.pdf

To view the Owner's Manual with Operating Instructions just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated and the contents of the Owner's Manual.

You may need ADOBE READER installed on your computer to read PDF documents.
You can download this free at WWW.ADOBE.COM if necessary.
Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, then follow the onscreen instructions to install the software on your computer.

I hope that was helpful to you, good luck and take care.

Joe.

Aug 15, 2011 | Vacuums

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Hi, my husband bought me your KAMENSTEIN WORLD OF MOTION SERIES ANIMATED HORSE CAROUSEL many years ago. I did not keep the box or manual and now I want to ask can you e-Mail me a download or one I can...


I cannot loacte an actual manual but....The Kamenstein Carousel teapot was part of the MKI versions of teapots Kamenstein released in the mid-2000s. The teapots came in a range of colors, from blue to red, and they had a small carousel on the top. As the water boils the carousel spins around, bringing an element of whimsy to your tea time. The teapots are all metal and can be used on any type of stove top.
Instructions

    • 1 Fill the Kamenstein Carousel teapot with water just below the sprout.
    • 2 Place the Kamenstein Carousel teapot on the stove and set the heat to "Medium."
    • 3 Allow the water to come to a boil and remove the Kamenstein Carousel teapot from the stove.
    • 4 Pour the hot water into a cup over a tea bag.


Read more: How to Use a Kamenstein Carousel Teapot ' eHow.com http://www.ehow.com/how_7718254_use-kamenstein-carousel-teapot.html#ixzz1JAQxUJn2


Thanks

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2 Answers

Microwave has power but won't heat


Hello,

Investigate these three areas if your microwave won't heat

Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

Testing a diode

NOTE: Before you test your diode, make sure your microwave is unplugged, and that you discharge the microwave's capacitor.

Whether it is shorted or open, a defective diode will most likely show some sign of defect. Defective diodes will usually emit an electrical burning smell, signifying its defectiveness. Also, it may have split in two, or it may exhibit a burned crack, or possibly even a blistered spot.

A shorted diode is indicated by a loud humming noise from the high voltage transformer, and no heat produced when a cook cycle is initiated. Whereas little or no heat produced in your microwave, with an absence of a humming noise is indicative of an open diode. In either case, the diode has to be replaced.

With your microwave unplugged, and your capacitor discharged, use extreme caution to remove the lead that leads to the capacitor. You can leave the ground connection attached. The side of the diode that goes to the ground is usually marked with a dot, stripe, or arrow. Set your ohmmeter to R x 10,000 or higher. Touch the positive meter probe to the anode and the negative meter probe to the cathode to measure the resistance across the diode terminals. Remember that the cathode is on the side that goes to the ground, which is often marked by a dot, stripe, or an arrow.

A normal diode, that is a non-defective diode, will read anywhere from 50,000 to 200,000 ohms. Differences in microwave make and model account for this large range in resistance readings.

Reverse the meter probes and measure resistance while touching the positive probe to the cathode and the negative probe to the anode. Reversing the probes like this should result in a reading of infinity. Unless a bleeder resistor is present. The presence of a bleeder resistor would produce a reading of the value of the resistor.

High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.

Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.

Testing a magnetron

NOTE: Before you test this component, make sure your microwave is unplugged, and that you have discharged the capacitor.

There are two tests to conduct in order to determine whether or not a magnetron has become defective. If you receive results other than what are detailed below, you will have to replace your microwave's magnetron. Each test is described for you here:

TEST 1: Locate your magnetron and label each of the wires attached to it so that you know which wires are to be replaced where. Set your ohmmeter to the lowest resistance scale. Take a resistance measurement between each of the magnetron's terminals by touching each probe to one terminal each. Reverse the probes and take a second resistance measurement. Each measurement should read less than one ohm.

TEST 2: Set your ohmmeter to its highest resistance scale. Touch one of the meter's probes to a magnetron terminal. Touch the other probe to the metal magnetron housing. Take special caution to not touch the two probes together. This could result in an inaccurate reading. This test should produce a reading of infinity - indicating an open circuit.

Read the tips on the below links on how to replace your microwave oven's diode and how to discharge the capacitor.

http://www.fixya.com/support/r7088355-replace_microwave_ovens_diode

http://www.fixya.com/support/r7088317-discharge_microwave_ovens_capacitor

I hope the above is helpful.

Good luck.

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1 Answer

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I don't know about yours, but my turntable will not stop rotating. I have to remove the carousel and put the item to be heated on the floor of the microwave.
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Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

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heatman101

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Sharp R-1480. Microwave would not start - jarred door, and it heated and worked. Replaced bottom of the 3 inter-lock door switches. Turns back on - all seems normal. No heat (it does overall sound...


Hi Mark,

It sounds like you have a magnetron problem now or at very least a rectifier that is shorted.

The elevated sound level comes from one of those two components. But since you had a door switch problem I would lean toward the problem being internal to the magnetron. It is common for them to over draw on the circuit going through the door switch before they fail completely.

To test the high voltage components you need a good ohm meter, the magnetron should read under 1 ohm from terminal to terminal and infinite ohms from either terminal to ground. The rectifier or diode should read 0 or low ohms in one direction and high or infinite in the other. BE SURE THE POWER IS OFF BEFORE SERVICING!

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