Re: HP41CV On rocker switch Message #2 Posted by Tony Duell on 24 Apr 2005, 11:03 a.m., in response to message #1 by Fred Loterijman
Most of the time, problems with the HP41 series are due to bad internal contacts.
The battery pack and modules connect to a flexible PCB that's held against the keyboard PCB by a strip of foam and the screws that hold the case together. The 'Fullnut' machines have a separate logic PCB that's connected to the keyboard by a zebra-strip type of connector, again clamped by the case screws.
If you are happy working on static-sensitive electronics, you could open it up (take out the battery pack, peel off the feet, the screws are under them) then clean the contacts with propan-2-ol (isopropanol, isopropyl alcohol). When reassembling, do not overtighten the screws, if you strip the thread in the top case, you will have a lot of work to do.
|