12 Nov
2005
12 Nov
'05
3:58 p.m.
Thanks for the hints, I was uncertain whether to use a continuity tester,
but it sounds safe.
The circuit boards are multi-layer and from what I can see, looking at one
side you can see writing on the layer below that says either +5 plane or
ground plane depending on which side you are looking at. I have never seen
this before, the buried ground and +5 buss, is this normal?
Some pictures of the device are at: http://users.starpower.net/dj.taylor/
BTW: I love the 'non-causal' nature of the list here, I get answers to my
post before it even appears!
Doug
At 08:49 PM 11/11/2005, you wrote:
of the
electronics? There are two cards, with standard TTL and analog
parts. The printed circuit has a design date of 1985, while the IC's have
88-89 dates.
One thing I forgot to mention in my last message. Get a good continuity
tester. 'Good' means one that is not fooled by diode junctions (and
preferably not by low-ish resistors), one that doesn't supply enough
voltage or current to damage anyting, one that beeps, and one that beeps
quickly (you want to be able to 'stroke' a probe along a line of pins to
see if a given connection goes to any of them).
The continiuty beeper in my old Fluke 85 is fine, for example.
-tony