|HP-67 ills again.|
Message #1 Posted by Michael Meyer, M.D. on 25 Nov 2001, 11:08 p.m.
Well, my HP-67 had, thanks to all of you, been running along quite happily, balancing my checkbook and teaching my daughter her multiplication tables.
Suddenly, it started acting flaky again. It acts as if the ACT chip is bad AGAIN, but not quite the same.
When first turned on, the calc shows the correct display, then quickly scrambles to 0's or off. On a whim, I applied 6 volts across the battery contacts, and it will run for a few seconds properly, then it starts to display strange things; then either blanking out completely or displaying all 0's.
Any ideas? Why would it work for a few seconds on power-up, then fail? Does the fact that it runs longer with a higher voltage give any clues? Did it burn out yet another ACT chip (remember-- it's one from an HP-25)? Bad power suddenly?
As always, I appreciate the support... it seems as if this HP-67 really belongs more to the world-wide HP community than to just me.
Unhappy programming today,