Question about Sharp R-340 Microwave Oven

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Control Panel not working

For last 2 months Ive been having problem with mycontrol panel it dosent work the LCD display is working but not the buttons I was wandering if theres a reset button I can press or a password any suggestion would be much appreciated cheers willcm8

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  • Anonymous Jan 09, 2008

    my LCD screen doesn't work anymore only a couple of lights seem to be there so it is guess the time you are putting in

  • jody h Mar 12, 2008

    I know it would work if i could find the reset button

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  • Sharp Master
  • 9,098 Answers

If it has a CUSTOM HELP pad (and that pad is working!) you should be able to press that to access the help menu. Child Lock may be the first item. If so, you're all set. If NO keys work, and the light comes on when you open the door, you probably have a problem with the keypad. Those can be replaced. An unresponsive keypad may be worn out due to age, may be damaged, or it may have gotten wet or otherwise contaminated. Moisture and contamination can be caused by spraying of cleaners, by storing the microwave in an unheated garage or shed, or infestation. I warn my customers to never spray cleaner directly onto the microwave keypad, since the liquid can get inside and "lock up" or even ruin the keypad or controller. Instead apply an alcohol-based cleaner (such as the purple kind) to a cloth (paper towels can scratch) and gently wipe it off. I suggest to my customers that they NEVER use any ammonia-based cleaner (like the blue stuff) on a microwave, since the ammonia will crack and distort polycarbonate plastics. If the keypad or controller has gotten wet, it can sometimes be carefully blown out with compressed air or heat. Another thing is to unplug the power at the mains for several seconds por minutes. Plug it back in and see if it works. A reset may do it. At power-up, the display should flash or show a text message. If not, a key may be stuck due to a foreign substance or a defective keypad. If certain keys are not working, there may be some foreign substance at the point where the green or blue plastic strip from the keypad plugs into the circuit board. To check that: 1. Be sure the oven is disconnected from the power line while you are taking it apart. 2. The keypad connection is the green or blue translucent plastic strip that plugs into a connector near the edge of the board. 3. There are two tiny tabs (one on each side) of the connector that you can gently pull up on to unlock the connector. 4. Then the keypad strip will lift out. Clean both sides of the end of the strip with alcohol-based cleaner if you like, but do not use ammonia-based cleaner. Dry the end of the strip. 5. Put the keypad strip back in, making sure both sides are down fully. 6. While holding the strip down, push the connector back down to lock it. 7. Try the keys again with the door closed. If you still need help, or need part ordering info, please repost. I appreciate your rating this answer.

Posted on Nov 15, 2006

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