The Museum of HP Calculators

HP Forum Archive 19

[ Return to Index | Top of Index ]

HP 21 keyboard problem
Message #1 Posted by Yvan Van Hoof on 23 Nov 2010, 9:32 a.m.

Dear forum,

Reactivation of my 1975 HP21 is ok after getting new "standard" batteries.

BUT: on the keyboard the touch "4" does not want to work....

Any idea how to solve this...?

Best regards

Yvan

Kapellen, BelgiumHP 21 keyboard problem

      
Re: HP 21 keyboard problem
Message #2 Posted by Walter B on 23 Nov 2010, 10:12 a.m.,
in response to message #1 by Yvan Van Hoof

Presumably you have to open the case. Please search on this site for instructions. I'm pretty sure we had this topic once at least, but can't spend the time to search myself.

HTH

      
Re: HP 21 keyboard problem
Message #3 Posted by Jeff O. on 23 Nov 2010, 12:21 p.m.,
in response to message #1 by Yvan Van Hoof

Check out this post from the archives. Other similar posts can be found. I found by searching for "scritch."

Edited: 23 Nov 2010, 12:24 p.m.


[ Return to Index | Top of Index ]

Go back to the main exhibit hall