Re: hp 33c donīt turn off Message #2 Posted by Christoph Widmer on 10 Apr 2007, 3:57 a.m., in response to message #1 by bernd scheurer
Hi Bernd,
I had once the same problem on a HP 97. There the issue was that, with long time use, the slider had scraped some metal off the contacts of the printed circuit and deposited in the gap between the contacts for the slider - effectively making contact all the time. I had to open the calculator and remove the metal deposit between the contacts. Of course, I cannot be completely sure your calculator has the same problem, but this is my best guess. If you attempt a repair, first consult the detailed descriptions on this website for taking apart the calculator and then don't forget to put back some appropriate grease on the switch contacts, otherwise your PCB-contacts will be scraped off rather quickly.
Good luck and best regards.
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