20 Most Recent Sharp R-930AK Convection/Microwave Oven - Page 3 Questions & Answers


Hello,

the problem of this unit is power related.

First, remove the unit's power cord from the wall, wait for about 30mins, then plug it back in. It may cool by then and might power on. If it doesn't power on, plug it into another outlet, to make sure there electricity entering into the unit.

If plugging into another power outlet doesn't power it on then the unit is most likely having a power problem.

When electric current comes from the power outlet into the cooker, it goes straight into the power supply board which then circulates the current into the unit. So if the cooker doesn't power on, the first thing is to make sure there is power entering into the machine.

So check the power cord, if it is a 3-pin plug, it must have a fuse in it. check the fuse if it is not blown. if fuse is intact, then power supply board should be checked.

If any machine or electronics device doesn't power on, it means its having a power problem. it might have worked fine in the past, but that's electronics for you. Power surge, irregular power supply, excess power supply, etc can affect the unit thereby not making it to power on.

This unit must have a power supply board in it where power enters from the mains. A capacitor, fuse, diode, etc may have been defective on the power board and maybe that's why its not making the unit turn on. There might also be some disconnection or something, inside the unit which is not making it to power on.

To actually find out what's wrong, you need to disassemble the unit with a screw driver and check what's wrong. You will be needing a meter and continuity tester in order to read the components on the power board, once you detect any bad component, you can make necessary replacement at any electronics accessories store withing our vicinity. This is the only way by which you can detect the problem.

Of course, testing the power board with a meter will require someone that has the ability. So it you can't, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.

I wish you the best of luck.

Regards.

Sharp R-930AK... | Answered on Nov 08, 2011


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. 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. 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. 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.

Regards.

Sharp R-930AK... | Answered on Nov 03, 2011


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. 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. 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. 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.

Regards.

Sharp R-930AK... | Answered on Nov 03, 2011


Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:

http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html?utm_source=emails?utm_medium=email?utm_campaign=2011-10%2BHow%2BA%2BMicrowave%2BWorks%2BVersion2&utm_medium=email&utm_source=emails
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off. Check the wave guide covers, if food had deposited
then it must be checked or replaced. See link:
http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html

Now keeping clear of the microwave, switch on; use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is heating without any issues, you can use the microwave safely

Sharp R-930AK... | Answered on Oct 27, 2011


If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead several seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

We have the service / repair manual for this model and have uploaded it to our site here for free download to help you.

Let us know if we can help further.

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

Sharp R-930AK... | Answered on Oct 06, 2011


On page 13 of the service manual here, there is troubleshooting info that is very helpful.

The manual also contains exploded views and disassembly instructions.

You can order Sharp 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.

Sharp R-930AK... | Answered on Sep 18, 2011


Hello, there is a component that is pulling more current than it needs to be. I would check the microwave HV diode there could be some leakage to ground. Also, the mega-tron tube might not be working the way it should. If the mega-tron tube is going out. Just replace the microwave oven. It is to cost prohibitive to replace the mega-tron.


If you replace the microwave oven. Please recycle your old microwave. Boy Scouts, recycling centers, some charitable organization will recycle. GB...stewbison

Sharp R-930AK... | Answered on Sep 06, 2011


Hi,

A microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO)/ thermal fuse on or near the magnetron or on top of the cavity / bodyof the oven.

If it goes dead for a while during or after cookingthen comes back on, the magnetron is probably overheating and causingthe magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should readopen, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or closethe door, then there's a problem with a door switch or door switchmount.

If it's intermittent or random, it may be a badconnection, usually on the control board or a loose fuse holder, oreven an intermittent fuse.

You should do a continuity test onthe fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in,then test it again.

If you remove the fuse, then press the meterleads against the ends, it can allow internal contact to be made andmake a bad fuse appear to be good.

If you or someone you knowdecide 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 also be a "mini-manual" hidden inside the unit behind thecontrol panel or hidden on the left side behind the grille, which isvery helpful when troubleshooting & testing.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

Can you tell us your location so we can locate the nearest repair service?

We're happy to help you and we'd appreciate yourthoughtful rating of our answer

Sharp R-930AK... | Answered on Aug 04, 2011


HI..there is a heating filament of an oven MAGNETRON..it s responsible of producing heat to the oven..possibly this is defective ..this filament must be replaced by a new one..theres no problem with the motor cos it runs the table power and light button seems working..HOPE THIS HELPS..thank yuo for choosing fixya..

Sharp R-930AK... | Answered on Jul 20, 2011


Depending on the model, it's not usually that hard. Attacking from underneath, what you will find on many models is atht there is a panel at the bottom that ALMOST looks like you can remove it, but it is ni fact solid and the "panel" is in fact part of the bottom of the machine, linked to it by a few bits of solid metal where most of it is free. Personally, I just snip through the bits of metal. and either make up a screw plate to hold it in place later or (If you are absolutely sure no prying fingers are getting near it) leave the thing off (I DO NOT advise you to do that though).

Once you have access then the motor is usually held in place by 3 or 4 screws and has a convenient plug and socket that you can pull and re-plug the new unit.

Sharp R-930AK... | Answered on Jul 07, 2011


This problem is commonly caused by a turntable motor that has worn out and needs replaced. The following link explains how to access and replace one:

http://www.fixya.com/support/r3555716-replacing_a_turntable_motor_on_a_microwa

For the model number you have listed, the part number is 46-841666-3.

You can purchase replacement parts at searspartsdirect.com.

The site also offers helpful exploded view diagrams to assist you in parts location/identification. The motor is listed at item 001-20 under the "Cabinet" heading. If you have any questions, please post back and let me know. I hope this helps you.

NOTE: You also consider the turn table coupling, which is item 004-22. The underside of the coupling has a keyed slot that fits on to the turn table motor shaft. If the coupling becomes cracked, or if the keyed slot "rounds out", it may be slipping on the motor shaft and not turning.

Sharp R-930AK... | Answered on Jun 11, 2011


Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

Sharp R-930AK... | Answered on May 20, 2011


You need to open the oven (unplugged) by removing the screws along the case. Inside, there is a 20 amp fast blow fuse that you can get at Radio Shack. It looks cylindrical and white. I would test that first. However, replacing the fuse may work, but then, other components may have shorted inside causing the fuse to blow. Try the fuse replacement/test it first. Good luck

Sharp R-930AK... | Answered on Apr 22, 2011


Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101 ';
;
'

Sharp R-930AK... | Answered on Apr 22, 2011


Time for a new one

Sharp R-930AK... | Answered on Apr 06, 2011


For model R-1752, it did not use a separate turntable coupler, the coupler is part if the turntable support, which is part number FROLPB025MRK0 (note ohs and zeroes).

You can order one from either Encompass here (for less but not in immediate stock) or from the
Sears Parts Direct Web site image-4235112-10659157(costs more but is shown in stock).

I've uploaded the service manual to our site here to help you.

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

Sharp R-930AK... | Answered on Mar 13, 2011


The magnetron (the part that heats the food) is probably done, they tend to go out if the fuse didn't blow and it usually isn't worth fixing as the cost of the magnetron is almost what it would cost to buy a new microwave.
Sorry for the bad news.
Benjamin

Sharp R-930AK... | Answered on Feb 23, 2011


Hi,


Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

Sharp R-930AK... | Answered on Feb 22, 2011


Hi,


Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic
Microwave Oven Troubleshooting Tips

heatman101


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Sharp R-930AK... | Answered on Feb 22, 2011

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