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I have a 27S with a loose connection - works fine if pressure is applied to base of display otherwise some keys don't work.

Would appreciate guidance on how to disassemble case and repair.

Bob --

The HP-27S is a Pioneer-series unit. Paul Brogger posted several articles that included instructions for opening a comparable HP-42S:

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=199

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=5

-- KS

Thank you very much, Karl.

Excellent information, I'll give it a try when I'm feeling lucky!

Bob