Question about Sharp R-1750 Microwave Oven

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Sharp R-1750 Microwave

When you close the door the light inside stays on along with the fan. I have to jiggle the door to stop the light and fan from staying on. Microwave will not run with the light and fan on after we program. This is driving my pregant wife carry twins crazy. Please help

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The door switches need adjusting. remove casing and adjust door switches

Posted on Feb 21, 2009

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2 Answers

Fan and light stay on when door closed. Shut off when door is open. Still heats. Door latch and spring are intact.


These door open or closed mixups are usually caused by the micro switches that are controlled mechanically inside by action of the latch when the door is closed/opened. There are usually 3 or 4 of those switches. Make sure the door protrusions are activating them. They can be replaced by generic ones of the same rating. I would replace them all! They cost less than $2 each. Order them online from a company like Mouser Elec or Digikey. You can test them for operation with the ohms function of a digital voltmeter. Be careful inside of a microwave. Deadly voltages even when off! Get some electrical help if you are unsure.

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One of the relays is stuck. Hit it firmly and see if the fan turns off

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Sounds like a door switch problem. Relays can stick too so tap them to release, they may need to be replaced

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Door won't stay closed


I just had this issue happen to me last week.. fortunately I was standing in my kitchen when it happened... I heard a snap and then a piece fall down the inside of either the door or the front key panel.. I'm assuming this controlled the door locking/oven turning on safety mechanism. The inside light wont go off and it won't turn on to cook.. I am trying to figure out if it's worth paying to fix or just replace the whole unit!? Anyone know if this is fixable by oneself rather than spend a bunch of money on a service technician??

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its just the door switches playing up on you,,but is it worth getting it fixed? after all a new microwave onle costs from £50 up today,,
please dont try fixing it yourself unless you realy know what you are doing in there, there is 1000's of volts hiding in there even if its been switched off for days, and them volts will kill you,
have you ever seen a stun gun working???it realy hurts you,,,,,this microwave has the stun guns big brother inside of it,,and it wont stun you,,it will kill you,, is it realy worth that for a fuw bucks?

Oct 24, 2009 | Sharp R-1491 Microwave Oven

1 Answer

Sharp microwave oven door won't close!


Normally the problem is not the spring, but a broken spring mounting tab on the door latch head (hook) assembly or the inner door panel.

If it's the door panel, it's usually easier and cheaper to use epoxy and some kind of hardware to fashion a new spring mount.

The door latch head (hook) is easy to replace or repair if that's the issue.

We 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.

Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the screws you need to remove.

Or you can watch a YouTube video (not a video I made) here that demonstrates how it's done.

If needed, the best place to order Sharp parts is Tritronics.

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

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control panel is hung up - replace panel and keypad.

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Fans continues to run.


door switches or control circuit, may be loose contact or open check all wiring and circuit...

Dec 18, 2007 | Sharp R-1470 Microwave Oven

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