Re: Problem - HP-97 Message #4 Posted by Tony Duell on 7 Sept 2007, 1:52 p.m., in response to message #3 by gileno
What electronic test equipment do you have, and what experience do you have with electronic repair?
The HP97 service manual is on the CD-ROM set. It contains full schematics of the machine.
I'd start by checking the voltages on the Vss (+6.2V) and Vgg (-12V) lines. If the power converter circuit in a Topcat isn't running, the protection circuit tries to bring the battery voltage right down and gets hot-and-bothered in the process!.
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