|41CV corrosion puzzle|
Message #1 Posted by bill platt on 12 June 2003, 10:58 p.m.
To any 41 repair experts:
I recently bought a 41CV (Fullnut) which, other than the battery terminals, is in really beautiful condition. And it has a set of manuals etc.
I got a decent price on account of the terminals, but here is the problem:
After surface cleaning of the negative contact (left side, looking from the back towards the front), the unit would not turn on. even with a little ball of wire smooshed into the contact, no power.
So I carefully took apart the (Fullnut) calculator, and saw that the corrosion had leached down the contact, and dirtied the contact at the printed circuit board. So, I carefully cleaned all the parts that had to touch, using a q-tip and a bit of alchohol. After drying the unit and reassembling, I put the little ball of wire in the negative contact, installed the batteries, and Voila!--it worked!
Unfortunately, after a blissful 10 days or so, she (the calculator, like a boat, is a vessel) locked up--with numbers in the dispay, she would not turn off or respond. So I took the batteries out. A few days later, I opened her up, re-cleaned her, and with more wire, put the batteries in, but the instant the batteries made contact, she let out this horrendous piezo squeek, and the display filled up with segments. Again, no keystroke response.
I am afraid for the worst, but I hope for the best. I took some pictures, but am not sure how to get them up on this site. I read a really great article (on MOHPC i think) about soldering a new terminal on. I suppose I could go for it--but I wonder if I have already "fried" the guts with my impetuous first repair.