|Re: HP-41 CV Charger?|
Message #5 Posted by Diego Diaz on 18 May 2003, 5:08 p.m.,
in response to message #4 by Ellis Easley
Well... er... about the balls, I can swear I've got no pics of'em... Ok, just kidding, let's say first I used a pair of seteel balls out from a bearing, they are 3'15mm diameter, the springs are 8mm length x 3,25mm diameter, I know for sure as I still keep a pair of each as spares.
The main question here, prior to attepmt any task, is to determine if your 41 is a Halfnut or a Fullnut, Half's have a rounded corner bezel in the display... (Luiz, some of your great pics may help a lot in here!) while Fullnuts have a squared corner display.
If yours is a Halfnut theres nothing you can do with the "balls/spring" solution, unless you *really* want re-engineering your 41 guts (Well, not that serious but somewhat messy). If it's a Fullnut then the PPC article Ellis mentioned should be of great help.
The standard HP connector shown in the picture I sent you comes into the 82120A Battery Pack installed in the calc thru the rigth side small port. This is obviously useless if you dont have the said 82120A. Anyhow if you remove this small port cover you'll see two small holes from wich the said balls shows a bit and make their contact with the (so called) "DIY" unnofficial connector.
I'm sorry but I've got no pictures of my calc (neither... ;-) nor my camera handy.
Keep the contact and kind regards.