Question about HP 48gx Calculator
The On button on my calculator only works some times. I thought it might be some sort of contamination so I peeled back the top metal sheet to look inside. That sheet is the one with all of the purple and teal button labels. Underneath are the buttons themselves. When I pulled up the On button, I saw the silver button underneath it. Everything appears clean. I can press the silver button with a pencil and feel it click, but the calculator doesn't always respond. When I press the On button down against the silver button, I get the same click and intermittent response.
The calculator battery may be weak. Replace 3 AAA cells and check if it works.
It is possible that sweat from your or someone else's hands hand leaked inside and dried up leaving a salt residue between the connections.
Remove the screws on the back panel to dismantle your calculator then use a piece of paper to clean the contacts between the top and bottom connector.
If you cannot get this done then take it to a watch repair shop. The person there can assist you.
Posted on Sep 09, 2009
Eventually there was a electronic failure on the board, yes the switch was fine but there was a short circuit on the connections from the switch to the electronic board, or a problem on the battery terminals to electronic board.
This may need a professional to check and look on the problem, the circuit board has to be test with a multimeter, to identify the parts has failed.
Hope this initial info/idea helps
Posted on Sep 09, 2009
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Posted on Jan 02, 2017
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