Re: 41CX current draw problem Message #2 Posted by Steve on 26 Dec 1999, 4:55 a.m., in response to message #1 by Walt Devaney
An interesting feature of this problem is that the "excess" current increaces as the calculator demands more current.
To me, this suggests that there may be a problem in that part of the HP41 that provides a regulated rail.
Does the HP41 have a DC-DC converter?
I can't remember. But any problems with components that reduce efficiency may cause a problem similar to what you mention.
It could be a leaky transistor, a leaky cap... because of the high current in OFF mode, I'd not suspect resistors or inductors. Previous leakage of batteries may have damaged the PCB alowing leakage the of current that you witness.
Gee, "leak" is a useful word isn't it! (Leeks are also useful, but usually in soup...)
|