Question about Sharp R-1480 Microwave Oven

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Sharp R1870 We have a Sharp R-1870 Microwave/Convection oven in our 2005 Fifth Wheel. Suddenly it will only operate for 59 seconds at a time. What could be wrong and can we fix it ourselves?

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  • kathyjud46 Aug 09, 2008

    Thank you for your help. I also saw something like this from you when I looked at my models site after finding this site. I have Sharp R1870. I am assuming that we must remove the microwave from the above stove spot in the RV in order to get to this area. Is it safe to try to replace the switch and damper motor ourselves or the damper door? We live in Bellevue, WA and the closest Sharp repair place seems to be in Kent, WA.

  • kathyjud46 Aug 10, 2008

    It is not clear how and where to send the $5.00 for the switch for the Sharp R1870 microwave.

  • kathyjud46 Aug 10, 2008

    What is your e-mail? When I click on e-mail in your reply I get an ad.

    Kathy

  • kathyjud46 Aug 10, 2008

    Thank you William. I ordered the universal switch through paypal just now. I hope this solves our problem.

    Kathy Judkins

  • Anonymous Sep 06, 2008

    We ordered the Sharp Damper motor #RMOTDA268WRZZ (also labeled as a stir motor) from the nearest Sears store and that solved our problem. Price was just a little over $8 plus shipping. I hope this is a newer motor with the defect solved. The old motor would hum with a 110v cord clipped across the terminals but no movement. Replacement was in tight quarters but if you move the big cap mounted on the back wall, (be sure to discharge it with a grounded lead) then you can get at the 1 mounting screw with a very short screwdriver. OF COURSE make sure the power is disconnected. ArtB art@rfstuff.com

  • Anonymous Sep 06, 2008

    Sorry. I meant to also say the hardest part was getting the microwave off the wall. There are two main mounting bolts with 3/8" heads under the metal vent filters, one on each side underneath. (Pull the metal filters back with the plastic tab to release them.) These long bolts go up at a 45 deg angle and attach to the wall mounted back plate. After removing these (be sure you are holding on as you do) if the microwave does not budge then you may have screws thru the upper shelf where it is mounted. The rear bottom of the microwave rests on a lip of the wall mount in back. Unfortunately the idiots who installed ours added an L bracket to the top for added support but they pop riveted it to the top of the oven right through the front bracket. We had to drill these out before we could slide the cover back off the microwave. (after removeing 1 screw on top and 4 on the back.) After removing the cover you will see a blank metal panel covering the back half of the right side (from front). Remove this and you will see the motor just like in the picture shown below. Remove the long mounting bolt that runs through this compartment for easier access to the motor. 1 screw secures the motor on the right hand side and the other motor tab slides into a slot on the left. Unplug the blue and grey motor wire and replace the motor. Reassemble in reverse order. (The AC cord can be unplugged by pressing the lower tab on back side where it plugs into top of oven and pulling plug out of socket.) The switch that is located on top of the bracket send a signal back to the control board to tell it whether the vent is open or closed. It could go bad also but ours was only the motor.
    Email me if you have any other questions. ArtB Art@rfstuff.com


  • rosenkavalie Oct 26, 2008

    We are having the exact same problem with our Sharp R1870. It will only operate for 59 secs on any cook cycle, and then shuts off. We were quoted over $300 by a sears repair technician for a new "brain board" but I am very sceptical as to whether that will fix it, especially having read about the damper. Can you tell me which damper parts you replaced, and whether that fixed the problem for you.



    Angus Watson

    angus.watson@comcast.net

  • Anonymous Mar 16, 2014

    where does it go? ours broke and when we took it apart it was out of place. trying to figure out the placement of it

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  • Sharp Master
  • 9,011 Answers

This is 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 senses that the door is not in the right position, it will shut down the cook cycle.

Sharp models stop after 59 seconds.

See the attached sample photo for a typical damper assembly.

We have the applicable service manuals for these models and have uploaded it to our site here and here to help you.

You will need the free Adobe Reader to view or print it.

The best place to order Sharp parts is Tritronics.

If you only need a switch, you can order one from us for $5 postpaid.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Sharp R1870 - dde7c96.jpg

Posted on Aug 09, 2008

  • 1 more comment 
  • William Miller
    William Miller Aug 10, 2008

    If you'll follow the safety & disassembly instructions in the manual, it should be pretty easy.

  • William Miller
    William Miller Aug 10, 2008

    Just send me e-mail and let me know you'd like a new interlock switch.

    I'll e-mail back with complete details.

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

    William E. Miller
    prototech@usa.net
    http://www.microwavedisplay.com



  • William Miller
    William Miller Aug 10, 2008

    Not sure how that could happen! My e-mail address is not clickable. It's prototech@usa.net

    Maybe you click on my Web address, which took you to my Web site MicrowaveDisplay.com?

    Here's better link to order the switch: http://www.microwavedisplay.com/switch_f...

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


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This is a problem in one of the damper-related components, either the switch or motor or the damper door may be binding.

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

Sharp models stop after 59 seconds.

See the attached sample drawing for a typical damper assembly.

We have the applicable service manuals for these models and have uploaded them to our site here and here to help you.

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

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

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looks like the timer brain has packed up on you,,
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