Hi Pete,
That stuff is likely just the remnants of the flux compound and only
means they didn't clean up very well................
What you're looking for is a pin that is sitting in a blob of solder, but
moves when pushed. Its a bit difficult to explain in words. Get a friend to
help you and do what I suggested before; push down from the top while you
look with very good light and perhaps magnification from below.
OR, just suck off the old solder and re-do each joint............note, it's
almost as easy to replace the connectors while doing this.
Regards, Jim
At 11:33 AM 5/20/2011, you wrote:
ike/all -
would this be an example of a "dry joint"? (see pic below - the white-ish
coloration around some of the solder points).
i would aim to desolder any points that look like this and redo. good idea?
pete
On May 20, 2011, at 11:01 AM, Ike wrote:
> Yes, and the blast of signal is known as an "audio weld". With an old
console, the fault Matt describes could be anywhere, but I would start
with the Molex connectors. Another point, the same issue can also be in
soldered connections that have either cracked from stress or become cold
soldered (or "dry" as they say in England) over the years. This usually
occurs because the joint wasn't that good to begin with. Over time
contaminants work their way into the joint and it loses conductivity.
Again, the first place to look is the Molex connectors at the point where
they solder to the motherboard and the channel strip. Move the strips
around and wait a day or two. If the fault moves with the strip, it's a
strip issue. If it stays with the position it's the motherboard. Another
Molex fault is loss of spring tension in the female headers. Try checking
each one with either a single Molex pin, or a tool that's about the same size.
> And finally, exercise the switches on the affected modules. I
don't know if this is the case on the S-3, but on the Elite, the 48v
switch actually carries the mic signal so it can stop audio even when not
engaged.
> Best
> Ike
>
> Ike Zimbel
> Zimbel Audio Ltd
> 416-720-0887
> www.zimbelaudio.com
> Sent from my iPhone
>
> On 2011-05-20, at 10:28 AM, Matt Syson <[email protected]>
wrote:
>
>> Hi
>> This fairly common 'gating' effect is usually caused by dirt on a
connector, switch or pot. An oxide film is created by chemical reaction
of dirt and contaminants in the air which create an insulation layer
often a few atoms thick. Putting a higher signal level through 'punches'
a path through this insulator (an absolutely miniscule spark) and for a
while it will work 'normally' (usually with increased distortion). Then
you switch off and leave it for a day or so and the contamination starts
its work again.
>> Dust, moisture in the air, smoke, all contribute to this.
>> Matt S
>>
>> On 20/05/2011 14:27, pete 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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