Question about Sharp R-1870 Convection/Microwave Oven

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How to replace the damper motor and damper switch.

Unit shuts off after 59 seconds. Everything I read suggests to replace the damper switch and motor. Any suggestions?

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Posted on Jan 02, 2017

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SOURCE: R-1874 shuts down after 59 seconds

That switch is supposed to tell the computer if the damper door is open or closed. If it does not go to zero ohms, the CPU doesn't know what to do. Check the thermistor too...... just in case...

Posted on Sep 13, 2009

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1 Answer

I Have a sharp microwave model # R1874. On the control panel, when I press the start button, the microwave runs for 59 seconds then stops. I have to press the start button again to have it run again. It...


That would be a problem in the damper assembly, either a bad switch or motor, or the damper door is jammed or blocked. Consult the attached diagram for general reference. The damper switch is the same as the primary interlock (door) switch.

zjlimited_813.jpg

Its location varies by model, but you'll have to take the outer cover off to find it.

The best place to order Sharp parts is Tritronics or you can call them toll-free at 866-779-5835.

If you only need a switch, you can order a universal type HERE

Also, I quote other similar solution...
I had the same problem. Turned out to be the micro switch and damper motor. I replaced both myself and fixed the problem for less than $40.00. The best advice I got was replace the switch, reconnect the motor and make sure the motor runs through a damper door cycle. It didn't run, even though it showed continuity and had power, so I replaced the motor which solved the problem. The micro switch which is activated by the cam on the damper motor has to be cycled within one minute, or the unit shuts itself off. The damper motor on my model R-1870 is found in the right rear section of the assembly when facing it. You have to remove the unit, and remove the outer casing to get to it. The damper is a simple sheet metal door, activated by the motor, and the switch mounts at the top of the motor and is activated by the same cam that activates the door.


Good luck.

Mar 06, 2011 | Sharp R-1874 Convection/Microwave Oven

1 Answer

The microwave shuts off after 59 seconds. You can push the START button and it will start again but shut off after 59 seconds. The convection oven component does the same thing.


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, 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.

Dec 16, 2010 | Sharp R-1874 Convection/Microwave Oven

1 Answer

The microwave will only work for 59 seconds then it stops. It is working but only for 59 seconds. I am not sure about the convection oven was afraid to try it. The unit is in our fifth wheel RV. I can heat...


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.

damper.jpgdamper.jpg

Apr 18, 2010 | Sharp R-1870 Convection/Microwave Oven

1 Answer

R-1874 shuts down after 59 seconds


That switch is supposed to tell the computer if the damper door is open or closed. If it does not go to zero ohms, the CPU doesn't know what to do. Check the thermistor too...... just in case...

Sep 12, 2009 | Sharp R-1874 Convection/Microwave Oven

1 Answer

No matter what time i put in it cuts off in 60 seconds on a sharp


This sounds like a bad damper switch or motor. Double check the shut off time....... see if it's actually 59 seconds..
When you unplug the unit from the wall for 2 minutes then plug it bad in, you should be able to faintly hear a motor run for a few seconds. This is the damper motor running. This will verify that the motor is operating.....
Also, check the thermistor.

Sep 08, 2009 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Sharp model R-1871 shuts off every 59 seconds


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 it 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.

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

b27054b.jpg

Aug 30, 2009 | Sharp R-1871 Convection Microwave Oven

4 Answers

Unit runs for 59 seconds and shuts off


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

The damper is a door located on the right side of the innards. The damper closes and opens depending on cooking mode.

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

You can order Sharp parts from Tritronics at http://www.wehaveparts.com

You can find a helpful exploded view by entering your model number here: http://www3.sears.com

Nov 16, 2007 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Shuts off after 59 seconds


That would be a problem in the damper aseembly, either a bad switch or motor, or the damper door is jammed or blocked.

Consult the attached diagram for general reference.

The damper switch is the same as the primary interlock (door) switch.

If you or a friend decide to look into it, we have critical safety information, switches diagnosis and replacement, and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

a6579a0.jpg

Oct 24, 2007 | Sharp R-1874 Convection/Microwave Oven

4 Answers

Sharp R-1874 shuts off after 59 seconds


I had the same problem. Turned out to be the micro switch and damper motor. I replaced both myself and fixed the problem for less than $40.00. The best advice I got was replace the switch, reconnect the motor and make sure the motor runs through a damper door cycle. It didn't run, even though it showed continuity and had power, so I replaced the motor which solved the problem. The micro switch which is activated by the cam on the damper motor has to be cycled within one minute, or the unit shuts itself off. The damper motor on my model R-1870 is found in the right rear section of the assembly when facing it. You have to remove the unit, and remove the outer casing to get to it. The damper is a simple sheet metal door, activated by the motor, and the switch mounts at the top of the motor and is activated by the same cam that activates the door.

Oct 24, 2007 | Sharp R-1874 Convection/Microwave Oven

5 Answers

Shuts down after 59 sec


Chances are you have a bad damper switch or wiring. A sample photo is here: http://207.234.249.73/mwd/damper.jpg It might also be a problem with the humidity sensor or a problem with the control panel, such as corrupted code or bad connections.

Dec 20, 2006 | Sharp R-1850A Convection/Microwave Oven

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