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  1. #1
    Les Paul Forum Member
    Join Date
    Oct 2015
    Location
    Basingstoke, Hampshire, England
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    Alex Lifeson Les Paul - Wiring issue

    Hi,

    I have an Alex Lifeson Les Paul with the graphtech piezo bridge.

    I've had some intermittent issues with the bridge, but to cut a long story short, some of the wires from the bridge have broken / snapped at the piezo (I think a bridge adjustment caused the issue). However I have sourced the relevant parts and was just about to fit them when I noticed that there is a suspicious looking BLUE wire that I believe is disconnected from the on/off/volume pot for the piezo. The other end of the wire is connected to the QSW connection point on the acousti-phonic pre-amp.

    Does anyone have a wiring diagram for this guitar, or if anyone owns one could you take a picture for me?

    I'm not electronic-savvy, so if it's not a simple fix for me then I'll get a tech to look at it........ but I don't want to confuse them with this non-simple wiring, so if I can go with schematic/diagram/pictures that should make things easier

    Thanks in advance.

    Cheers

    Dave#...

  2. #2
    Les Paul Forum Member
    Join Date
    Jun 2007
    Location
    England
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    479

    Re: Alex Lifeson Les Paul - Wiring issue

    I have no first hand experience of them but there are some wiring diagrams and info here https://graphtech.com/pages/ghost-wiring-diagrams

    QSW seems to stand for quick switch so your assumption that the blue wire goes to the on / off switch would appear to be correct, this diagram shows a blue wire from a push pull pot switch https://cdn.shopify.com/s/files/1/23...ckswitch_1.pdf

  3. #3
    Les Paul Forum Member
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    Oct 2015
    Location
    Basingstoke, Hampshire, England
    Posts
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    Re: Alex Lifeson Les Paul - Wiring issue

    Quote Originally Posted by PaulD View Post
    I have no first hand experience of them but there are some wiring diagrams and info here https://graphtech.com/pages/ghost-wiring-diagrams

    QSW seems to stand for quick switch so your assumption that the blue wire goes to the on / off switch would appear to be correct, this diagram shows a blue wire from a push pull pot switch https://cdn.shopify.com/s/files/1/23...ckswitch_1.pdf

    Thanks Paul, that's very helpful.

    Indeed I have the Graphtech diagrams, and have also received a wiring diagram from Gibson (and another forum). However to my (simple) mind there seems to be a contradiction in the diagrams .... assuming that I am reading them right.

    The contradiction appears to be that the Gibson diagram seems to have the blue wire - OPEN..... and that is causing me some confusion as graph tech indicate that it goes to the switch.

    Following the Graphtech diagrams, which are pretty good to be fair, I need to know where to connect the wire when looking at a gibson specific push/pull volume pot.

    I am making progress, but not being a wiz with electronics, I want to be careful so that I don't screw anything up.

    If anyone has any (relevant) thoughts, advice, guidance or photo's of the volume / tone pot cavity that would be most welcome.

    Cheers

    Dave#...

  4. #4
    Les Paul Forum Member
    Join Date
    Jun 2007
    Location
    England
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    479

    Re: Alex Lifeson Les Paul - Wiring issue

    If you can post the diagrams and ideally a photo of the guitar wiring showing the switch I might be able to help more.

  5. #5
    Les Paul Forum Member
    Join Date
    Oct 2015
    Location
    Basingstoke, Hampshire, England
    Posts
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    Re: Alex Lifeson Les Paul - Wiring issue

    Paul,

    You previously passed through the link to the graphtech site with the manuals and wiring, but here is a summary of the pages I was referring to https://www.dropbox.com/s/7raagn49vh...53.30.png?dl=0

    This is the diagram I was sent by Gibson https://www.dropbox.com/s/7rvhq5giwo...matic.pdf?dl=0

    and here are some pictures of the guitar wiring (apologies for the quality)



    Note that the BLUE wire in the pictures is shown on the Gibson wiring diagram as RED/BLUE(OPEN)

    Ultimately, I don't know if the loose blue wire should be connected to anything. It appears from the Gibson wiring that it shouldn't, but it is strange that they have routed it through to the control cavity, rather than simply clipping it short.

    So I don't know if you can make sense of the pictures / diagrams. If you can't - I thank you for your help so far ... the internet can be a great place, and is full of knowledgeable people such as yourself.

    Cheers

    Dave#...

  6. #6
    Les Paul Forum Member
    Join Date
    Oct 2015
    Location
    Basingstoke, Hampshire, England
    Posts
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    Re: Alex Lifeson Les Paul - Wiring issue

    Quote Originally Posted by PaulD View Post
    If you can post the diagrams and ideally a photo of the guitar wiring showing the switch I might be able to help more.

    Paul - I have posted a reply (yesterday) with links to diagrams and pics.... but the post is awaiting approval from an admin..... hopefully it will appear soon

  7. #7
    Les Paul Forum Member
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    Jun 2007
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    England
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    479

    Re: Alex Lifeson Les Paul - Wiring issue

    Yes, it certainly looks from the Gibson schematic that it's not connected but strange that it would be left like that with a bare end, at the very least I would expect it to be insulated in some way. I would think the thing to do is try it with the wire disconnected first, if everything works as it should then just tape it up and leave it, if it doesn't work properly then I would try it connected to the switch terminal above the red and black wires. At the end of the day it's all signal path wiring so it's not going to cause any harm if it's not connected correctly, it just won't work as expected!

  8. #8
    Les Paul Forum Member
    Join Date
    Jun 2007
    Location
    England
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    479

    Re: Alex Lifeson Les Paul - Wiring issue

    Just thinking a bit more about this, the Graphtech diagram shows the red black and blue wires going to a 3 position switch to select either the normal pickups, the piezo or both together. I guess the Gibson switch is only a 2 position push/pull switch so only 2 of these options would be available? That would reinforce the idea that it should not connect to anything.

  9. #9
    Les Paul Forum Member
    Join Date
    Oct 2015
    Location
    Basingstoke, Hampshire, England
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    6

    Re: Alex Lifeson Les Paul - Wiring issue

    Paul,

    your input is greatly appreciated, and as a non expert in the field of wiring/electronics it gave me some confidence that the wire shouldn't be connected and is actually a 'red-herring'; more importantly it also gave a direction to fault find if more investigation had been required.

    I've replaced the graph tech saddles in the bridge, and routed everything appropriately, and then connected it all together. All components of the guitar are now working as they did prior to the original issue.... and the spurious blue wire (RED/RBLUE (OPEN) on the gibson diagram) is not needed, so I have tidied that away.

    I suppose that the wire should have been clipped in the factory ... but never mind. My problem is solved, my guitar is fully usable again and my concerns were alleviated by your input.

    Many Thanks

    Cheers

    Dave#...

  10. #10
    Les Paul Forum Member
    Join Date
    Jun 2007
    Location
    England
    Posts
    479

    Re: Alex Lifeson Les Paul - Wiring issue

    You're welcome, glad you got it sorted

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