Question about Texas Instruments TI-82 Calculator

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=keys not working

I have a TI-82 and the following 7 keys do not work...... #'s 0,1,4,7 and the "clear" "," sin keys

Mike C

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  • Anonymous Mar 13, 2014

    factorial key on ti-82?

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Hello mchonto. Remove the battery. Perform the following on a cloth placed on a table. Remove to case screws buy using a jewellers screw driver. Carefully open the case. Disassemble the main PBbd support to aquire access to the key board. The key board is made up of diaphram switches. The diaphrams may be broken or dirty or a trace on the PCbd is open. Clean the diaphrams with a dry Q-tip or mostion Q-tip with Aceton. Connect the battery & test. #2 CAREFULLY reseat the felx ribbon trace from the key bd in to the socket. Reconnect the battery & test operation. Malfunction changed, clean the traces with a #2 pencil eraser. Retest. Good Luck

Posted on Oct 09, 2008

  • Gene Pitts Oct 26, 2008

    Hello mchonto, Did the cleaning help or change the problem?

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