I haven't been able to find any info on this microwave oven. The "start" on the touchpad doesn't work all the time. There's power, the automatic features work (minute button, express defrost, etc.) Can the touchpad be replaced (Part number?) or would it be cheaper to just go buy a new oven? Thanks.......
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The keypad is available separately (you have to peel off the old one and stick the new one on) for about $36 plus shiping. It is also available preassembled with a new control panel frame and display for about $78 plus shipping. They are available from Tritronics at http:www.wehaveparts.com BUT - I would first suspect and check for a failing door switch. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure. I have a text file called "doorsw.txt" which helps in diagnosing and repairing door switch problems, and a file called "safety.txt" which is of vital importance. You can find these files via a Google search. In some cases, the problem is a bad connection or a bad relay on the control board. That's something we see from time to time, and we repair those nationwide, but it's usually a door switch. If you still have a problem, please write back with more detail. Be safe!
Posted on Oct 14, 2006
I had the exact same problem. I didn't want to pay $35 for a keypad on a $50 microwave, so I fixed it myself. The problem was with the switch. If you have some soldering capabilities, you can add another switch to act as your start button. I've posted the how-to here:http://www.youngcircuitdesigns.com/?p=49
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It sounds like you may have an intermittent door switch or loose door switch mount.
Does it work differently when you wiggle the door?
At our site, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information.
See our listing here on FixYa: http://tinyurl.com/yzjozk
Oct 19, 2007 | Sharp R-408HS Microwave Oven
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I have the same problem. Sometimes it works after I turn it off a while, but not always. I have returned one of these for a new one, and it is doing the same thing. In both cases, I had them about a month. If a solution can't be found, I will return this oven, as well, but I won't be bringing home any more Sharp products.
This touchmatic II glass touchpad keeps time but timing is erratic. Touch a number and it is liable to repeat one or two times before you can lift a finger. Oven runs, but timing is not accurate. I believe the part might be repaired as it most likely is a board component.
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