Posts: 106
Threads: 34
Joined: Jun 2011
Raymond, Thanks for your reply, it must have scared at least one of the HP-41's - it stopped beeping!
I checked the other one for contact between cpu and keyboard and - Voila - there was corrosion on the connector (i think it is called the zebra connector, right?) I tried to clean and fix it, yet to no avail. Got once a steady "Memory Lost" display with no keys working. Than I turned the zebra around to see if that changes anything, nope. I read in the 'Repair of a HP41 CX" article how the cpu can be hardwired to the keyboard, it just sounds like a lot of work...
Any idea how to clean/repair the zebra?
On a different note: One of the beeping ones seems to have been subject to a speed up and I wonder if the capacitor is broken (it looks pretty bad...). It is on the left side of the board (facing down, display on top side), where there is a second lengthy, slivery capacitor mounted on top of a first similar looking one. That second one is connected with a blue capacitor which is with a wire soldered to a spot on the top side of the board. Can I just remove the two extra capacitors and the wire?
Thanks so much for your help to a repair newbie...
Peter
Posts: 106
Threads: 34
Joined: Jun 2011
I just found some PPC article with respect to speed up and so I did take out the extra 2 capacitors with the cord. It then had the beeping problem that I resolved following your sage advice of "BEEP". it now works fine.
Thanks a lot yet I'm sure more questions will arise once I try to revive the last of the batch, maybe I do do the hardwiring of the cpu-board... any other/better ideas, please send them forward!
Cheers