Re: HP-34C Display Looks All Matrix-Like Message #2 Posted by Katie on 23 Mar 2004, 10:52 p.m., in response to message #1 by Joe D'Andrea
If you're seeing an Error <anything> it's not DOA. This message is produced by the CPU in response to various invalid operations, etc.. Since the calc display is intermittent I'd guess that the chips are nor making good contact with the circuit board inside the calc. Some versions of this calc have the CPU chip and the 3 RAM/ROM chips held in place against the circuit board with spring steel clips. You need to take the calculator apart and re- seat the chips, display, keyboard and circuit board itself -- they all go together in a sandwich-like structure.
There are many references as to how to do this on this site.
Here are some of them:
http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=361
http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv013.cgi?read=38031
Edited: 23 Mar 2004, 10:54 p.m.
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