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Tips for fixing an Audio Snake/Multicore
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b_dann_b
Presonic
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Joined: 09/03/2011 13:03:37
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HI everyone,

recently picked up a cheap 16/4 multicore that has a couple of dead channels and wanted some advice on fixing it. So far i've done a continuity check using a cable tester on all the channels and found about 4 issues (either break/open or a short). Ive also jiggled the cable (with the dead channels connecter to the tester) to get an idea of where some of the cable issues are.

i've found that there are issue with the cable itself (i.e i move the cable in a particular spot and the tester comes up good) so my query is how can i fix the cable that may be in the middle of the multicore? or do i just right it off? is there anything else i can test to work out for far in the break is (there's still one channel with an issue)? its a 30 metre multicore. There are some signs of wear on it, but non of the wear is near where i've found issues on the cable.

any advice is appreciated - this cable looks like its been kept in a garden shed
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robare99
Presonic
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If you change the returns to sends, you could use it as a 16 channel drive snake. Then use a 30m 8 channel return snake.
gadget69
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Very difficult to find the problems when each core is wrapped in a shield.. a "fox and Hound" signal probably won't get through the shields.

I have a snake with a questionable (works 90+% of the time) none of my tech tools has helped me...
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Monolithent
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Cut it in half and keep the end that still works!!

Normally you'll find the failures in the fanout. The other end doesn't move much and is less likely the culprit.
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livedb
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The only way I know would be to cut out the bad aria.
Then you are left with two smaller snakes and a lot of soldering...
You could solder a fantail on each end, and reconnect them together to get a long run done, and still be able to use each one as a smaller snake too. Probably not best for shielding, but useable.
You could also just attach a multi-pin connection on each if you'll never use them small.

Or, buy a new one....

This message was edited 1 time. Last update was at 19/12/2012 15:57:06

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Dennis a
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b_dann_b wrote:HI everyone,

recently picked up a cheap 16/4 multicore that has a couple of dead channels and wanted some advice on fixing it. So far i've done a continuity check using a cable tester on all the channels and found about 4 issues (either break/open or a short). Ive also jiggled the cable (with the dead channels connecter to the tester) to get an idea of where some of the cable issues are.

i've found that there are issue with the cable itself (i.e i move the cable in a particular spot and the tester comes up good) so my query is how can i fix the cable that may be in the middle of the multicore? or do i just right it off? is there anything else i can test to work out for far in the break is (there's still one channel with an issue)? its a 30 metre multicore. There are some signs of wear on it, but non of the wear is near where i've found issues on the cable.

any advice is appreciated - this cable looks like its been kept in a garden shed


Fixing this snake probably isn't worth the time you will waste on it but if you see it as a challenge it is do-able. As Monolithent said, most problems show up on the fan end. Another place to look is around the strain relief on the stage box. You said you found a problem somewhere in the middle of the snake.....try to narrow that problem down as close as possible and mark the location on the cable jacket. Carefully cut the jacket without cutting any of the shielded pairs inside. You want to cut a door in the jacket large enough to inspect all of the channels. When you find the defective shielded pair(s), make the necessary repairs which will probably include splicing in an additional inch on any pairs you have to repair (once you cut into a pair, it will be too short to rejoin without additional length). When you complete the repair, roll the jacket back around the snake and tape it in place with etape. Find some heat shrink tubing the correct size for the snake...use tubing with adhesive on the inside. You need a piece long enough to cover the cuts in the jacket and the etape you used to close the "wound".
Unfortunately, you will have to remove some or all of the XLR connectors on the fan end in order to get the heat shrink tubing onto the snake. Install heatshrink, replace connectors and you should be good to go.

Are you shure you still want to take this project on? Good luck.

This message was edited 1 time. Last update was at 20/12/2012 05:29:31

b_dann_b
Presonic
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Dennis a wrote:

Are you shure you still want to take this project on? Good luck.



only a true sound guy would spell sure as shure

thanks very much for your advice dennis, it does help a lot. i'll give it a go - nothing to lose. the thing cost me like AU$75 so worst case i'll chop it up into smaller pieces as suggested above and go from there.

Thanks everyone else as well - all the info has been valuable.

This message was edited 2 times. Last update was at 20/12/2012 06:05:17

Audio Engineer
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