HP-67 - 1612A03018 - Card Reader Advice Requested (was HP-67 - strange behavior)
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06-15-2019, 11:42 PM
Post: #2
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RE: HP-67 - strange behavior - any advice appreciated
Hi Alberto,
Seeing that [0.00] was displayed proves that the CPU worked properly, albeit briefly. Does [000] appear if in W/PRGM mode? Swapping the CPU board if you have a spare one, would verify the rest of the calculator operation. Because it was corroded and cleaning seemed to have stopped it working, as a start I would look closely at the circuit board traces, then the battery/board wiring terminations, and the brass link at the charge socket. All that corrosion probably came from the pcb traces and washing the board may have degraded one (or some) a little more than the circuit can handle. Maybe some "gunk" ended up (or dislodged) under a chip, or a weakened component connection has now become a dry solder joint. Probably a rarity, but board components can be damaged by static electricity during handling. cheers Tony |
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