The keyboard is covered with cellophane tape to keep the
keys in place when the two halves are separated.
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Although vintage Hewlett-Packard calculators were designed and built very well, occasionally they do need repair.
The following documents the initial disassembly of an HP-11C (Voyager series) calculator. It was built in 1985.
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The keyboard is covered with cellophane tape to keep the
keys in place when the two halves are separated.
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On the back, peel up the rubber "foot" at each corner
and remove the screw underneath.
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Carefully separate the top and bottom halves of the calculator.
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Remove the rubberized sheet between the keys and the printed circuit board.
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Here's a close-up of the domed keypad, built into the circuit board.
Sometimes cleaning around an intermittent keypad will help cure entry problems.
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The entire printed circuit board may be removed from the back
shell for further troubleshooting and repair or replacement.
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Last updated February 22, 2003