Re: HP45 Message #4 Posted by Katie on 10 Apr 2003, 4:18 p.m., in response to message #3 by Ernie Malaga (Miami)
I've never hear of this problem on the 45, but some 21, 22 and 25 do have a warm-up issue. Although solid-state devices don't normally need any warm up time, when the chips are marginal heat can make a difference in their performance (both making things work and not work).
The 3 Woodstocks mentioned sometimes develop a problem with their memory chip where it will not work a until the chip heats up a bit. If you let the calculator stay on for a few minutes then turn them off and back on this usually fixes the problem. You can bypass the warm-up time by heating the chip slightly. I also have seen 65's that work fine until the CPU chip has been on for about 5 minutes. If you cool it off it start working again.
That said, I suppose that the 45 in question could have a marginal ROM chip and heat makes a difference.
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