|Re: Dying Hp-42s needs doctor|
Message #6 Posted by Andrés C. Rodríguez (Argentina) on 6 Apr 2002, 8:26 a.m.,
in response to message #5 by David Smith
If there is a diode to protect the circuitry for reverse poalrity, reverse batteries won't do a thing. If there is no diode, ICs are very likely to be damaged, particularly CMOS RAM.
So: DON'T DO THE REVERSE POLARITY TRICK!!!
Also it is nonsense from an electronics engineering point of view to short circuit the batteries (except to help them discharge and overheat, something we are not supposed to look for).
It makes sense to REMOVE the batteries and short circuit the terminals, to discharge capacitors that may be inside, so to fully erase all memory, registers, etc. and force a cold reset.
If we are entering the non-scientific-approaches land, perhaps someone should suggest *which* type and value of coin will offer the best results. For magic purposes, I'd suggest a Krugerrand, or Canada gold coins, but any *gold* coin will do, as long as it is in *mint* condition...
Just my 10 pennies