Question about Sharp R-1850A Convection/Microwave Oven

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Sharp R-82STM-A microwave doesn't ding

Microwave no longer beeps (when we program it, when it finishes cooking etc). It did make a clicking noise when the clicking would usually occur, but no longer. I assume it's broken and needs to be replaced. It is about 3 weeks old. Has any one else had this issue?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

tiway1
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SOURCE: replace glass turntable for Sharp microwave

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Posted on Jul 06, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: noisy microwave not cooking

Is it making a louder than usual; buzz or hum when you try to cook?

If so, I would suspect a shorted high voltage diode ore a bad magnetron.


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






line-height:normal">mso-fareast-font-family:"Times New Roman"">http://www.microtechfactoryservice.com/diode.html



line-height:normal">mso-fareast-font-family:"Times New Roman""> http://www.microtechfactoryservice.com/mag_test.html



line-height:normal">mso-fareast-font-family:"Times New Roman""> http://www.microtechfactoryservice.com/xformer.html





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We have the service manual and I have uploaded it to our site for you here.


-.htmPlease reply back here if you still need help.

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

Posted on Jul 12, 2008

najah
  • 180 Answers

SOURCE: sharp R-1871 microwave/convection oven. Microwave will not work

This may be due to the microwave section not working. Check the high voltage diode if it is ok, replace the Magneton.

Posted on May 30, 2009

MicrowaveSvc
  • 9047 Answers

SOURCE: I need a manual for Sharp Microwave/ Convection R7A85

You can download that here free.

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

Posted on Aug 30, 2009

  • 1 Answer

SOURCE: Sharp Carousel 2 Microwave start switch broken

Hi George,

I ahve the same issue. Did you manage to repair it or did you need replacement?

If repaired then how?
if replaced then where did you manage to get the part from?
Regards
Vipin

Posted on Apr 13, 2012

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Sharp convection microwave oven model R1875F. It's cooking on the left side faster then the rest of the oven. It seems to burn on the left side and not cook in the middle.


see the next causes. 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.

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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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