Hi Pete,
IMO, the weakness with the 3C is in order:
poor soldering between the Molex connectors and the back plane
potentially worn out pins in the Molex connectors
back plane flex
You can try to re-solder all the connectors, but it really isn't all that
much more effort to just replace them all. That kills the first two issues
at once.
There are different areas where the back plane will flex when you try to
insert or tighten the cards..............from memory, the worst area was
nearest the master section, but that could vary console to console. What
you want to do is get on your back with good lighting underneath and have
someone press down from above. Work your way from one end to the other and
see if you can find the areas where movement occurs. Depending on how much
and where, you may be able to brace things to improve this. Watch
particularly the areas where any two back plane section boards meet; these
seem to be problematic.
I'd start with replacing all the connectors, if you can't do that now,
re-solder them all; BTW, a good way to find bad solder joints is to use the
same process of finding back plane flex. Good luck!
Regards, Jim
At 09:27 AM 5/20/2011, you wrote:
bros -
continuing the surely long and possibly never ending list of questions on
my series IIIc restoration project...
i am seeing the following behavior on the input modules (as well as the
cue modules)...
i'm feeding the line in with the multitrack output, and as i bring up the
fader (and the input gain) i get weak, fuzzy signal... until i jam the
gain way up there (very quickly) and the channel then "comes alive" so to
speak. i can then bring it back down to a sensible level and all is OK.
what problem is this behavior indicative of? bad connection to the
motherboard? or a component problem in the line in circuit? at the
electrical level, how is a dodgy connection "made OK" (in a sense) by
pumping a greater voltage through it?
thanks all -
pete------
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