Question about Microwave Ovens

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My micro was in bluge ; when the voltage increase rabdilly the micro turned off ' the fuse is good .

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  • Microwave Ovens Master
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Intrinsic.

Posted on Jan 31, 2010

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6ya6ya
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Sharp R-9H84B-display black, cleared display shows "Conv Mix, 88:88 Auto". Short time all dark again. Hit clear happen 2 times then, all dark, no power, can't clear won't start, nothing works.


R-9H84B - May 29, 2017

I would suggest pulling the control board out and looking on the foil side (opposite the component side) for "ring cracks," most likely on the low voltage transformer's connections.

The board may have the screen-printed reference designator "T1" near the low voltage transformer.


ring_cracks-gr02aocewnccyez3v1hdhepo-1-0.jpg

Also be sure the fuse is not easy to turn with your fingertips when it is in the holder. If it is, the fuse holder is too loose and must be replaced (not just squeezed with pliers).

You can order a fuse holder, part number WB06X10034 for $6.49 (subject to change) from the Pros here.

If you have any keypad issues, please note that the membrane keypads for this model have long been discontinued.

FixYa does not directly notify us experts of responses, so if you have other questions, please contact me directly.

- William E. Miller, AS-EET
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May 28, 2017 | Sharp Microwave Ovens

1 Answer

Why does light comes on turntable turns when door opens nothing lights on display or nothing works ?


Normally faulty micro switch which needs replacing: Caution: hight voltage may be present so best left to service person

Jul 23, 2014 | Oster Microwave Ovens

1 Answer

Sharp micro doesn't heat


see this causes and fix it. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

Door Switch If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.
High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.

Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
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Oct 02, 2012 | Sharp Microwave Ovens

1 Answer

Fuse blown and replaced it but keeps blowing new fuse


Either s door switch is defective, or the capacitor is shorted.
If it blows immediately, check the door switches.
If it blows when trying to run the micro, check the high voltage capacitor. Be very cqreful when checking the capacitor as it can be very dangerous, holding a large voltage charge long after use.
Good luck.

Dec 30, 2010 | Sharp R-4A78 Microwave Oven

1 Answer

My microwave starts however food does not heat up.


Micro wave as the name suggests produces heat when the micro waves aimed at an object causes the water molecules inside the object to vibrate hence producing heat.The gadget responsible is the magnetron. If your magnetron is not receiving ht voltage or receiving but faulty, then your micro wave wont work please take precaution when opening micro wave due to high voltage caps that remain charged sometimes even when it is off.check the high voltage fuse/ diode and capacitor if they are fine and the step up trans former o.k then the only option is to replace the magnetron

Aug 02, 2010 | GE JVM1790 1000 Watts Convection /...

1 Answer

The plate is turning the light is on the time counts down but the oven doesn't heat


Unless you are familiar with high voltage circuits I will not advice you to probe within. But keep this advice in mind when you call a technician for an estimate. Check if the high voltage capacitor has failed, if so the thyritron will not work and have micro waves. Also check for the fuse to the main circuit from the transformer. If the relay of the main circuit does not click when the microwave is switched , check the timer pcb. You can also have a failed thyritron but this must be reviewed for a reasonable estimate.
Hope this helps. Good Day

Jun 25, 2010 | Microwave Ovens

1 Answer

There's no high voltage ,thus no magnetron activity


check the ceramic fuse in the primary circuitry as it probably blew out when the primary connection arced and burned through

Mar 23, 2010 | Magic Chef MCD1110ST Microwave Oven

1 Answer

GE SpacemakerXL Microwave Model JVM1450 It's been working great. Then put somethingin,turn it on. It ran 30sec. made a growling sound,like it was straning or slowing down,then Blew the fuse.I replace the...


SOUNDS LIKE MAYBE HIGH VOLTAGE RECTAFIER SHORTED MIC ARE VERY DANGEROUS THEY HOLD VOLTAGE EVEN WHEN UNPLUGED YOU MAY CONSIDER PRO ON THIS SORRY

Nov 06, 2009 | GE Microwave Ovens

1 Answer

Microwave blowing fuses when setting programme


suspect high tension diode or bleed diode faulty. easy to replace but!!!!!!!!!!!!!!!!!!

BE CAREFUL. THERE ARE VERY HIGH VOLTAGES PRESENT IN A MICROWAVE. YOU MUST SHORT CIRCUIT THE CAPACITOR WITH A GOOD QUALITY SCREWDRIVER IE GOOD INSULATION. VOLTAGE CAN BE UP TO 1500 VOLTS AND IT CAN KILL.

IF YOU ARE NOT SURE WHAT TO DO, GET SOMEBODY IN

Jul 05, 2008 | Neff H7871N2GB Convection / Microwave Oven

1 Answer

Brother put a foil wraped burger in micro now everything is dead


Hi, You may want to try to check/troubleshoot the PCB underneath the display/control panel. The mains do supply two circuitries: the heavy load and the electronics. In some units, they have a standard transformer while in others an SMPS that supplies the +5 (and sometimes +12 or higher) voltage. This powers the electronics which includes a microcontroller, timer, relay drivers and display panel. Trace the transformer/SMPS and look for any fusible link, secondary fuse or surface mounted fuse. More often than not, there are also standard components along the way like bride diode, diode, filter capacitor and regulator IC. Check for VDC input and output of power components. Hope this gives you an idea, Pls post again how things turn up or if you need further information. Good luck and kind regards.

Aug 11, 2007 | GE Spacemaker JVM1640SJ Microwave Oven

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