Re: HP41CX doesn't turn on Message #3 Posted by Vieira, Luiz C. (Brazil) on 22 Jan 2005, 12:43 p.m., in response to message #1 by Ralph
Hi, Ralph;
I own five working HP41, one of them (HP41C) is with me since it was bought new in the beginning of the 80's. All I can tell you is that I experienced some cases like this, where you insert batteries and they momentarily charge the capacitor built in parallel with them. Because of bad contact (battery holder springs with residual corrosion, batteries main contact set, even contacts between IO/Batt assembly and mainboard...), the batteries do not feed the mainboard circuitry after they are in place, so the remaining charge in the capacitor is enough to power the calculator up time enough for you to see MEMORY LOST message fadding. In all cases, I cleanned each part I mentioned above, same sequence, and tested the calculator. I don't recall any unsuccessful attempt. In two or thee cases I had to reduce the spring pressure by "deforming" them slightly; some springs force the IO/Batt assembly too much when and after the bettries compartment is inserted.
If you need to open the calculator there are some helpfull hints here, but I'd try some "external" cleanning mostly if you have not done this before.
Let us knwo what happens next.
Success!
Luiz (Brazil)
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