Re: HP-19C Gone Loco! Message #3 Posted by John Garza (3665) on 27 Oct 2002, 1:29 a.m., in response to message #2 by David Smith
This seems strange, but it appears to be related to the battery. The wild printing never happens when the machine is plugged into the charger, or shortly after being disconnected. Let it set (turned OFF) an hour, and it goes loco again when turned on. Funny though, the low battery indicator never comes on, and the display seems normal during the loco printing.
My fully charged Ni-MH pack put out 5.61v, but I noticed it dropped to 5.56v within a few minutes after removal of the charger. At about 5.40v, the loco printing starts. Disassembling the battery pack, it looks like 2 cells have some internal short as they discharge much quicker than the other two. I replaced all 4 cells with alkalines (6.09v now), and all is well. The display is just perceptibly brighter, but everything works.
Very weird.
-JG
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