HP Forum Archive 16

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HP75C Message #1 Posted by Prabhu Bhooplapur on 24 July 2006, 2:02 a.m. I have a HP75C which is malfunctioning. With battery removed for some hours, I press ATTN and then insert a fully charged battery. After this I press ATTN once again, the Time Setting Line appears on the display. I can also set the time and go to EDIT mode. After a while the calculator either hangs up or turns-off. Before it hangs I can run a program by reading from the card reader. Trying to reset according to manual does not help. Does anyone has a clue how to solve this problem? Does anyone have a copy of the service manual? I would very much appreciate. Thanks. Prabhu

Re: HP75C Message #2 Posted by Raymond Del Tondo on 24 July 2006, 2:45 a.m., in response to message #1 by Prabhu Bhooplapur Dear Prabhu, maybe Tony Duell has more info on this machine. Another related link could be http://www.series80.org/ , since the HP-75C uses a similar CPU as some (if not all) of the Series 80 desktop computers. Best Regards Raymond

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