The Museum of HP Calculators

HP Forum Archive 20

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HP 21 calculator
Message #1 Posted by Chris Stam on 30 Jan 2011, 7:58 a.m.


I've brought back my HP 21 with a new battery pack to life.

Only problen is that the button "5" doesn't give any response (on the display).

I suppose this is an contact problem, however I cleaned the whole calculator's contacts allready with spray.

Any suggestions?


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