|Re: Repaired HP41CV hangs on error.|
Message #3 Posted by Geoff Quickfall on 26 July 2009, 5:38 p.m.,
in response to message #1 by Dan Koller
firstly, Randy is the guru here so I bow to his diagnosis but before you lose all hope read on!
I have just restored two HP 41CX halfnuts and a 41CV fullnut. These too required repaired screw posts:
(battery post repair
All three also needed bottom shell washer reconstruction:
Now to the crux of this posting. The two CX's failed to respond after a thorough cleaning, repairing and reassembly. If I was lucky I got nothing but strange characters, other times no display at all.
I tried the memory lost salute, removing the batteries and shorting the far left battery contact with the far right, master clear with batteries removed and all the other methods to reset that are available. I ultimately left the calculators with batteries removed for 4 days as I happened to leave for a trip.
When I came back, I installed the batteries (new) and tried both calculators starting with the memory lost keys (ON and back arrow). I got the memory lost display which I cleared with the back arrow key and they both WORKED and have ever since! I remembered that this was one of the ways to reset the HP 41 series in the event of a severe Synthetic programming mistake.
So try removing the batteries and leaving the unit for a couple of days.
Edited: 26 July 2009, 6:06 p.m.