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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>>
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