|Short Battery Life 41CX|
Message #1 Posted by T Smith on 2 July 2002, 9:06 p.m.
I searched the archives, but didn't see anything related to my question, so apologies if this has already been discussed.
My 41CX has started eating batteries every few months, even when the calculator is not turned on! I read an earlier post in which someone said it could be the main power supply capacitor, but I'm thinking that would be the case, only when the power is turned on.
I measured the current draw with the calculator both off and on. When on, it varies, but seems to be a little over .001A. When off, the current is .00002A (measured with an HP multimeter, of course:-)). Now assuming an N size battery gives 50mAH (I have no idea what the actual number is), this would yield only about 3 months of battery life when off! This is fairly close to what I'm getting. And I killed 2 sets of batteries, so it's unlikely that I got a bad set of batteries.
Has anyone experienced this before or have any ideas what it could be?
Is there a schematic available, or is it possible to remove the keyboard to see if there is junk underneath that might be causing leakage in the off-state.
Thanks for any suggestions. Tom