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MXR dynacomp (script) 1975 schematics

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    g1
    Don't forget the joker

  • g1
    replied
    1976 MXR Dynacomp schematic attached.
    Attached Files

    Leave a comment:

  • Chrisfromiowa
    Junior Member

  • Chrisfromiowa
    replied
    Thanks, you rock Bill!

    Leave a comment:

  • 52 Bill
    Old Timer

  • 52 Bill
    replied
    Red wire (upper right in photo)= +9 volt battery Neg side of battery goes to ring terminal of the input jack

    Yellow wire= pcb in Goes to one side of ft. switch and to input jack

    Grey wire = Wiper of Sensitivity pot

    Orange wire= CW term. of Sensitivity pot CCW terminal of sens pot not used

    Red wire (lower right in photo)= ground Should be black wire

    Purple = pcb out Goes to CW terminal of output pot

    Let me know if there is anything that you don't understand or if there is something else you need to know.

    Leave a comment:

  • Chrisfromiowa
    Junior Member

  • Chrisfromiowa
    replied
    Hello Bill,
    OK, what I have is thisClick image for larger version

Name:	mxr-dyna-comp-pcb-rear.jpg
Views:	2
Size:	32.5 KB
ID:	848143 what I'd hoped for was either another photo that shows where these wires connect, or just the names of them, ie Orange wire= V+, yellow wire= pcb in, Grey wire = pcb out, or whatever they are. Thanks

    Leave a comment:

  • 52 Bill
    Old Timer

  • 52 Bill
    replied
    Originally posted by Chrisfromiowa View Post
    I know almost a decade has passed, but I wondered if you had any more pictures of the dynacomp. I've got the populated pcb with some wires and nothing else and there don't seem to be a lot of complete images on the net. Thanks, regards Chris
    What is it that you are looking for? The schematic will show you what is missing, (pot, switch , jacks) and how they connect to the circuit. It shouldn't be that hard to figure out where the wires go on the board and what they connect to.

    I have an old one somewhere around here that i can pull apart for you, but it would be nice to know what you are looking for before spending a lot of time doing that.

    Leave a comment:

  • Chrisfromiowa
    Junior Member

  • Chrisfromiowa
    replied
    I know almost a decade has passed, but I wondered if you had any more pictures of the dynacomp. I've got the populated pcb with some wires and nothing else and there don't seem to be a lot of complete images on the net. Thanks, regards Chris

    Leave a comment:

  • mathologie
    New Member

  • mathologie
    replied
    thank you, this is great becaus as I see there is a big modification on mine
    hope I can repair it now

    Leave a comment:

  • oc disorder
    Senior Member

  • oc disorder
    replied
    I have an old script logo one, the transistors on mine are MPS5172
    Code:
    http://www.onsemi.com/pub_link/Collateral/MPS5172-D.PDF
    a general purpose NPN.
    It's a good thing I opened mine up - the containing foam had gone rotten
    so due for a clean out.... I'll make up something to stop it shorting.
    Here's 2 pic's of my Dyna Comp PCB.
    Hope this is useful to you.
    Attached Files

    Leave a comment:

  • mathologie
    New Member

  • mathologie
    replied
    Ok thanks I have got te transistors and te IC but now I see there is a little resistor on the oter side of the board is that normal ? I am affraid I have done some mods years ago. Do you have a photo of the board behind?
    Attached Files
    tboy
    Site Janitor
    Last edited by tboy; 11-23-2008, 12:32 AM. Reason: attached image

    Leave a comment:

  • Mark Hammer
    Senior Member

  • Mark Hammer
    replied
    Voulez-vous tout simplement que ça fonction ou qu'il est précis pour l'époque historique? Si tous que vous voulez est un Dynacomp fonctionnant, un 2N3904 sera suffit.

    Leave a comment:

  • mathologie
    New Member

  • mathologie
    replied
    OUAHHH

    that is fast ...
    the only thing that whorries me is the sentence
    "the transistors may be 2n3904..."

    Thanks I will try and replace and give news

    Leave a comment:

  • MarkusBass
    Senior Member

  • MarkusBass
    replied
    Is it this one: http://www.mif.pg.gda.pl/homepages/t...s/dynacomp.gif ?
    All transistors are 2N3904.

    Mark

    Leave a comment:

  • mathologie
    New Member

  • mathologie
    started a topic MXR dynacomp (script) 1975 schematics

    MXR dynacomp (script) 1975 schematics

    Hello everybody

    Im new here (from paris)

    Im seaching for the schematics for my old MXR dynacomp (script) 1975

    I ave found the main IC (CA 3080) but a transistor is broken and has no reference on it.


    thanks
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