Re: HP 11C Requiem for an old friend Message #2 Posted by OJM on 2 Nov 2001, 9:21 a.m., in response to message #1 by Gordon Brunson
Have you tried the recovery procedures described in the owner's manual? The 0.0000 display is the default display (after "Pr Error") following a power loss, so there may still be hope. If you don't have the manual any more, it says to try the following procedures on a calculator that doesn't respond to keystrokes:
Press the "ON" and "Y**X" keys simultaneously (that's Y to the X power, 4th from the left in the top row), then release.
If that doesn't work, remove and reinsert the batteries (you've probably already tried this).
If the above doesn't work, momentarily short the battery terminals to each other while the batteries are still in the calculator. (A paper clip seems to do best.)
My own 15C gave me a scare once when it seemed to just die, and I had to resort to the shorting procedure to get it to wake up again. It still acted a bit strange, and on closer inspection I found that after 19 years the battery terminals (this is an early unit with the flat contacts, and no spring) had tarnished and flattened out to the point that the batteries were making intermittent contact. Cleaning with an eraser and bending them back slightly has the unit working reliably (I hope!) again.
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