Hi folks,
I've recently rebuilt the posts on my old HP 41CV calculator. I gave each of the contacts on all the boards a good cleaning with an alcohol swap and blew dry with air and re-assembled the calculator.
The calculator now appears to work fine (whereas it wouldn't even turn on before) but there is a problem. Upon any error, e.g. divide by 0 or Log(0), the display goes blank and the calculator appears to hang up. CLX or <- do not restore the display. The ON button does not respond. Sometimes holding the CLX key while toggling the ON button results in a CLX command and the calculator continues to function normally until the next error. The calculator is clearly on because I do not get a MEMORY LOST message in this scenario.
...and on further investigation, in PGRM mode, hitting the SST key results in the SHFT flag in the display being show, and the calculator also hangs up. So there are other problems.
Does anyone have any suggestions on how to procede to fix this?
Thanks much, and I love this museum!! If all else fails, I will revert to the HP25C emulator on the links page. Very nice!
Dan