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Inductor on HP 25C board
09-21-2015, 03:48 PM (This post was last modified: 09-21-2015 04:38 PM by Harald.)
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RE: Inductor on HP 25C board
The ACT and anode driver needed replacing. But now I get the screen filled with zeros every time I press Enter or a function key.
Am I right in assuming this means that RAM is not working? Shame, would have been nice to get this 25C back to life. Now it appears to be a candidate for Bernhards new ACT.

Edit: The issue has somewhat changed. I now have a non-programmable 25C. I have checked a couple of functions and they work, but whatever I enter in program mode, all I get is "13 00".
Is program memory located in one of the chips and the other one is for all the rest?
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Messages In This Thread
Inductor on HP 25C board - Harald - 09-21-2015, 09:36 AM
RE: Inductor on HP 25C board - Harald - 09-21-2015 03:48 PM
RE: Inductor on HP 25C board - PANAMATIK - 09-21-2015, 07:18 PM
RE: Inductor on HP 25C board - Brad Barton - 09-30-2015, 04:49 PM
RE: Inductor on HP 25C board - Harald - 09-21-2015, 08:50 PM
RE: Inductor on HP 25C board - PANAMATIK - 09-22-2015, 07:31 AM
RE: Inductor on HP 25C board - jebem - 09-22-2015, 08:49 AM
RE: Inductor on HP 25C board - Harald - 09-22-2015, 01:47 PM



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