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Wiring trouble shooting...help....

 
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tnt



Joined: 14 May 2007
Posts: 2897
Location: Princeton, NJ

PostPosted: Sun Feb 14, 2016 11:58 am    Post subject: Wiring trouble shooting...help.... Reply with quote

Can someone take a look here and see any obvious errors?

Getting no sound at all when plugging in and tapping pups.

2-p90s...

Thanks,


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Kregg



Joined: 22 Apr 2008
Posts: 3334
Location: Atlanta

PostPosted: Sun Feb 14, 2016 12:59 pm    Post subject: Reply with quote

Do you have a schematic or wiring diagram?
It looks like lugs 1 & 3 are both grounded on the volume pot.
Also, though not very common, solder has been known to seep through the outer grounding shield and cloth pushback causing shorts.
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tnt



Joined: 14 May 2007
Posts: 2897
Location: Princeton, NJ

PostPosted: Sun Feb 14, 2016 2:19 pm    Post subject: Reply with quote

I was working with a few diagrams, so maybe I screwed something up?

Does it matter which lug the cap goes on? Some had it on middle, some on the side.


That volume lug that looks soldered I'll double check but I don't think it is.

Thanks for the help.
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marksound



Joined: 15 Aug 2005
Posts: 16672
Location: OKUSA

PostPosted: Sun Feb 14, 2016 3:04 pm    Post subject: Reply with quote

Make sure the braided shielding isn't touching anything it shouldn't. I just went through this with a Gibson humbucker in a Tele. With the control plate out, all was good. As soon as I set the plate in place, nothing. I finally threw a Hail Mary and taped off the braid.

That shielding must have been shorting out on the switch or a pot. Regardless, it's working fine now.
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tnt



Joined: 14 May 2007
Posts: 2897
Location: Princeton, NJ

PostPosted: Sun Feb 14, 2016 8:22 pm    Post subject: Reply with quote

Grrr.....resoldered a bunch of connections. Nothing.

I took the output out, keeping it wired. When i hold the tip of the guitar cable to the tip of the jack, I get the pickups to come alive.

So the sleeve seems to kill the signal.

huh?
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scottystrathead



Joined: 27 Mar 2008
Posts: 1047
Location: Lancaster,Ky

PostPosted: Sun Feb 14, 2016 9:49 pm    Post subject: Reply with quote

I would make sure the jack is not touching the copper shielding when plugged in.
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tnt



Joined: 14 May 2007
Posts: 2897
Location: Princeton, NJ

PostPosted: Mon Feb 15, 2016 9:20 am    Post subject: Reply with quote

scottystrathead wrote:
I would make sure the jack is not touching the copper shielding when plugged in.


Nope. thanks though.

I pulled the jack out and tried it loose outside of the guitar - same issue.

The tip side of the jack shows life - tip of plug to tip of jack = some noise from pups.

But as soon as the plug sleeve contacts the jack sleeve, everything goes dead.

Which doesn't really make sense....

Hmmm - there must be a short somewhere....
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Mr. Clevername



Joined: 08 Dec 2006
Posts: 2450
Location: San Francisco, CA

PostPosted: Mon Feb 15, 2016 1:25 pm    Post subject: Reply with quote

I don't understand how the volume pot seems to be wired. Shouldn't the lug on the right be ground?
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Gatorcountry



Joined: 29 Sep 2004
Posts: 601
Location: Gainesville, FL

PostPosted: Mon Feb 15, 2016 2:29 pm    Post subject: Reply with quote

Try removing the wires from the jack and touching them directly to the plug (tip and the sleeve) and see if you get any sound that way. If you do then it is something with the jack, if not probably the volume pot or a ground issue.
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tnt



Joined: 14 May 2007
Posts: 2897
Location: Princeton, NJ

PostPosted: Mon Feb 15, 2016 3:30 pm    Post subject: Reply with quote

Mr. Clevername wrote:
I don't understand how the volume pot seems to be wired. Shouldn't the lug on the right be ground?


I thought the lug AWAY for the pups should be ground....in fact, I switched this after wiring it up and finding it dead. But it's still dead...
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tnt



Joined: 14 May 2007
Posts: 2897
Location: Princeton, NJ

PostPosted: Mon Feb 15, 2016 3:31 pm    Post subject: Reply with quote

Gatorcountry wrote:
Try removing the wires from the jack and touching them directly to the plug (tip and the sleeve) and see if you get any sound that way. If you do then it is something with the jack, if not probably the volume pot or a ground issue.


good call - thanks.
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tnt



Joined: 14 May 2007
Posts: 2897
Location: Princeton, NJ

PostPosted: Mon Feb 15, 2016 8:32 pm    Post subject: Reply with quote

OK - fixed it....not sure how...

Started by removing the tone circuit from the mix, and that worked. Realized I did have the lugs reverse.

also removed some shielding from under the pots thinking it was shorting things out under the lugs.

Removed the volume pot because it was getting messy, put a new one item, rewired...it worked.

Thanks for all the help...

Loud hum still, but will worry about that when I get the neck on and strong it up...
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