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Question about Sharp R-1872 Convection/Microwave Oven

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Baked a cake and noticed the next day that there is no power, the microwave has just stopped working, no power coming through. Have checked the power switch and the power outlets all working fine except that there no current coming through to the microwave oven

Posted by Tony on

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ernesto cuadra

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  • Sharp Master
  • 12,223 Answers

Test the thermal fuse for open or bad contact with VOM
2)check the hooks door, or release door button, +switch door for open with VOM.
see the diagram for troubleshooting.
Gd bless you
Baked a cake and noticed the next day that there i - 7_15_2012_12_31_39_pm.gif7_15_2012_12_32_15_pm.jpg

Posted on Jul 15, 2012

5 Related Answers


William Miller

  • 9179 Answers

SOURCE: microwave oven inoperative

When you enter the time then hit START, does the turntable motor come on? If not, then I would suspect the secondary interlock switch, its mount, or its wiring. If so, then it's hard to say, unless there was some miswiring somewhere. The original problem sounded like just a classic bad door switch. At this point I suspect the wires on one of them may not have been reconnected exactly where they were. It does matter. I would suspect the secondary interlock switch, which MAY have white/white and grey/grey wires attached. Also, one of the switch mounts may have a broken tab that makes the switch move so it's not getting activated. At our site, we have the service manual for the R1830, which is similar to the R1480-series. We have that plus *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa:

Posted on Feb 27, 2007


William Miller

  • 9179 Answers


This is probably due to a bad door switch, most likely the top one. The microwave got hot because the cooling fan was not running. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: You can find helpful exploded view diagrams and order parts by entering your model number here:

Posted on Apr 26, 2007

SOURCE: microwave oven inoperative

check high voltage section, check magneatron, diodes, etc.

Posted on Nov 04, 2007


William Miller

  • 9179 Answers

SOURCE: Sharp Covection Oven/Microwave stops after 1min on any setting

This 59-second stop failure is due to a problem in one of the damper-related components, most likely the switch, but it may also be the motor or the damper door.

The damper is a door inside that opens or closes depending on cooking mode. If the controller thinks that the door is not in the right position, it will shut down the cook cycle.

See the attached sample photo.

If you or someone you know wants to look into this, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa:

We even have a video on our site that shows you how to safely & easily remove the control panel assembly to send it for service.

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


Posted on May 09, 2008


  • 1550 Answers

SOURCE: My Sharp R-9h91b microwave oven

The continuity of current is lost you need to check the continuity by multimeter .Then we can get idea what causes the problem ?


Posted on Sep 28, 2008

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