|Re: Dead 41C - Help...|
Message #4 Posted by Andrés C. Rodríguez (Argentina) on 25 May 2004, 5:53 p.m.,
in response to message #1 by Joanne
Excuse me for asking the obvious but, as opening,cleaning and closing is not so simple, I would rather start by the reset sequence (keep pressed the CLx/A key and press ON) Try many times, if nothing happens, then an internal bad contact may be the suspect. Just in case, recheck batteries regarding voltage and polarity, and bad contacts on the battery holder.
If you decide to open it, etc., then be very cautious with the rubber feet (to be able to set them back after a successful repair), and also with the screws: any excess force while unscrewing or screwing will damage or break the plastic posts which act as "nuts" or bosses for the screws. You should be able to gently rotate them (Phillips head) while allowing for them to naturally came out (I mean: don't press down!).
There should be many assembly-disassembly information for HP-41C in the Internet, take enough time to read before beginning. Yours should be the variant usually known as "fullnut", in case you see the term. All 41C are "Coconuts", but later models have a smaller circuit board inside, and are called "halfnuts".
Good luck! Keep trying to revive this jewel which, in your case, will have an additional value for your son, as something passed from one generation to the next.
In case you decide not to open by yourself, there are some respectable repair shops, and you will find useful information in this site and in this Forum. Welcome!!