TAC Scorpion S1101 mute issue

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TAC Scorpion S1101 mute issue

Postby buttley » Mon Mar 07, 2016 12:22 pm

hi there all,

i am a new member, i have a TAC Scorpion II,

30-4-8-2 Configuration.

i am part way through re-capping the S1101 channels, 25 completed so far.

everything is working on the desk, with one exception.

on one of the (S1101) boards, the mute led is behaving strangely,

the channel passes audio fine,
eq works,
sends,
buss sends,

engage the AFL,
AFL led works,
AFL signal is good,

engage mute,
mute works,
mute led is so faint as to not be lit.

then engaging AFL,
takes out both the led's,
to very faint. AFL still passes audio correctly.

i have already re-capped this channel,
the issue was there both before & after the re-capping,
i have also swapped the three transistors on this board with new ones, just to see if that could solve it.

i also re-floated a heap of random solder joints on this board.

can anyone help me figure this out please.

S1101 Mute.png
buttley
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Re: TAC Scorpion S1101 mute issue

Postby buttley » Mon Mar 07, 2016 12:29 pm

i think this is the right bit of circuit.

Image
imag
buttley
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Re: TAC Scorpion S1101 mute issue

Postby AnalogStudio7 » Mon Mar 07, 2016 6:57 pm

Trace the signal flow from input throught the Mute switch.

Since you just recapped the channel strip, most likely you lifted a solder trace or solder pad from the PCB board, breaking the signal flow.

Check each solder connection in the signal path, especially where you removed/replaced the caps, with a high power magnifying glass if you can't trace out the signal flow with an extender card and the channel strip out of the console.

These PCB traces and solder pads lift and crack very easily with too much heat. It's really easy to do when recapping. Take your time and recheck the soldering and the traces/pads.

Best of luck in your endeavors!

Cheers,

Greg
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USA
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Re: TAC Scorpion S1101 mute issue

Postby buttley » Tue Mar 08, 2016 12:31 pm

thanks for the advice Greg,

turns out, it was just a defective led.

if anybody knows what the correct specs for a replacement led should be, please feel free to chip in, or maybe somebody has an old one kicking around so it will match the others.

anyways its all good for now.
buttley
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Location: London UK

Re: TAC Scorpion S1101 mute issue

Postby Jim Williams » Wed Mar 09, 2016 11:34 am

I sent one out to Kingston, Jamaica a few years back. I replaced the master module led's with something to reflect the beauty of that island.

The mute led was tourqoise, the peak was magenta and the other one was purple or similar. I sand them first to difuse the light as they are higher output 3 mm led's.

All of the peak led's in my Soundcraft console were replaced with high output red, you can't miss those now.
Jim Williams
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