HP-27 Power-on Problems Message #1 Posted by vrollinger on 30 June 2000, 8:31 p.m.
I have an HP-27 that has a problem powering on. Usually if I just turn on the power switch, nothing happens. Sometimes if I leave the power switch turned on for several hours, a weird number will show up in the display; then if I cycle the power, it will appear to power up normally, but the memory will not work (RCL # always returns zero) and the summation and financial functions do not work. If I leave the calculator attached to the charger overnight, everything works fine. This same problem occurs with several different battery packs, and I don't believe the problem is either discharged batteries or the contact point with the battery.
It seems to me that there is a weak component in the calculator (a capacitor perhaps?) that needs to warm up for a time before the calculator operates normally.
Does anyone have any ideas or suggestions? Thanks.
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