|Re: HP-27: Why would this trace be cut?|
Message #2 Posted by Vieira, Luiz C. (Brazil) on 9 Aug 2002, 5:42 p.m.,
in response to message #1 by Mike
this "all decimal points on" situation means running in low battery. As you disassembled and reassembled it and it turned into normal operation, chances are you had just a bad contact in one of the power lines (or connections on it).
By looking at the photo, it seems the cut was drill made (by hand?). I do not have any HP27 in hands, and I had an HP22 (no longer with me). In my HP25 I see the resemblance, except for an electrolytic capacitor that is soldered right bellow the 3.6K resistor (orange, blue, red). On it, the copper trace is not interrupted, and it works fine.
I know it does not help much, but I noticed there is no capacitor in your board. Should you verify if there is any sign if some component was removed? In your photo, right bellow the resistor (a bit to left), there is what seems to be a desoldered component pad. Is it corect?