Question about Sharp R-1750 Microwave Oven

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Sharp R-1750 shuts down.

The screen has had the usual display issues for some time. My wife and I simply memorized the button positions from the manual, and have been using it thusly for years now. Last week a new problem developed. After starting the microwave, it would run a few seconds and suddenly shut the entire machine down, as in total power failure. Unplugging will reset everything, but it now shuts down the instant you hit the start button. Is there any chance the usual board failure could be the cause of this as well? We really like this machine...

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  • Sharp Master
  • 9,098 Answers

The shutdown you're experiencing is separate from the control unit / display issue.

The shutdown is probably due to a a loose fuse holder, loose wiring, or a problem on the inverter board or the magnetron.

If the control unit doesn't receive the proper signals form the inverter, it will shut down the cooking process, but you say it acts like it's being unplugged - that makes me suspect a loose fuse or wiring.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person attempt to take readings on these inverters.

We actually have the service manual for this model and have uploaded it to our site here to help you.

You will need the free Acrobat Reader to view or print it in case you don't have it already.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

The best place to order Sharp parts is Tritronics. You can also call them at 866-779-5835.

If you get the shutdown problem repaired, we'd be happy to repair your display problem for you.

We regularly repair these control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

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

Posted on Nov 24, 2008

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follow the next steps use the VOM and fix it. God bless you

  1. Main control boardIf your microwave runs for a few seconds and stops, the first thing to check is the main control board to ensure that a shortage has not occurred. If the part is defective then it will need to be replaced to prevent continual shut offs. If this is not the issue, the next step would be to check for a faulty touchpad.
  2. Touchpad/Control panelIf the control board is not the issue and your microwave continues to shut off after running for only a few seconds, the next thing to check is your touchpad, which is also known as a control panel. Although uncommon for this issue, symptoms are usually that the display and some buttons are working properly; however, when selected some buttons are not functioning. If this is the case the touchpad will need to be replaced.
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There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, & testing..

I'm not finding the one for for this model online.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

If it's a convection model, F5 would be a damper door sensing error, which is usually a bad switch.

More info on switches is here.

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.

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"Some models are equipped with a sensor that can automatically adjust the oven's heating time based on the amount of steam in the oven. If your microwave is displaying E1, E4, or E5, there may be an issue with the gas sensor. For an E1 error, press the Cancel button and check on the food.

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Feel free to contact me directly if you need more help.

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

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