Question about Sharp R-1490 Microwave Oven
I have a Sharp microwave R-1490. When trying to use the light comes on, timer counts down but doesn't heat and the fan isn't running. you do hear it click upon start.
That would be a defective secondary interlock (bottom door switch) or its mount.
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 in case you don't have it.
Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.
There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.
The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.
Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.
If you only need a switch, you can order a universal type here for $5 postpaid.
If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Dec 17, 2008
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Posted on Jan 02, 2017
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