Troubleshooting wah mod

Discussion in 'Effects, Pedals, Strings & Things' started by stu2, Jun 4, 2006.

  1. K-man

    K-man Member

    Messages:
    1,061
    Joined:
    Feb 3, 2006
    Location:
    CT
    It's hard to tell from the picture, but check that the input and output jacks are wired correctly. The white wires should go to the tip of the jack.

    If you're not sure which lug is which, go here and scroll down a little:
    http://www.diystompboxes.com/cnews/FAQ.html
     
  2. stu2

    stu2 Member

    Messages:
    88
    Joined:
    May 12, 2006
    Location:
    Nashville, TN
    Thanks for the input. I did not touch the jacks when I made the mod. Any other ideas?
     
  3. K-man

    K-man Member

    Messages:
    1,061
    Joined:
    Feb 3, 2006
    Location:
    CT
    Everything else looks correct. Are the blue and red wires touching at the switch?
     
  4. stu2

    stu2 Member

    Messages:
    88
    Joined:
    May 12, 2006
    Location:
    Nashville, TN
    No. Do you think it has anything to do with this board being a Revision C instead of a Rev. D? The diagram Stuart has drawn looks identical.
     
  5. K-man

    K-man Member

    Messages:
    1,061
    Joined:
    Feb 3, 2006
    Location:
    CT
    Could be. Can you take another picture showing the bottom of the circuit board (same as Crybaby003), but hold the wires down so I can see which color wires go to which part of the board?
     
  6. AL30

    AL30 Member

    Messages:
    2,985
    Joined:
    Jul 20, 2005
    I don't quite remember the mods but... What wiring diagram did you use? On your last picture (of the DPDT switch) why are there two wires coming from the lug on the top left (Orange and Brown)? Depending on what wiring you did you (may) only need one (again not sure what the mods are).

    For a DPDT the middle lugs are signal in/out, outer set jumpered, other outer set circuit in/out. You've got an extra wire in there so you're sending your signal somewhere - unless you did the RAT wiring.

    Here is the wiring I am referring to

    http://homepage.ntlworld.com/s.castledine/greenfuz/wiring.html

    Here is the other wiring

    http://www.generalguitargadgets.com/diagrams/switch_lo_dpdt_input_grd.gif

    AL
     
  7. scottywompas

    scottywompas Member

    Messages:
    1,595
    Joined:
    Feb 9, 2006
    Location:
    Sunny California
    for what it's worth, I had a problem with the imput grounded method of wiring when I did my crybaby. I just used the standard GGG true bypass mehtod and it works fine.

    Scott:JAM
     
  8. stu2

    stu2 Member

    Messages:
    88
    Joined:
    May 12, 2006
    Location:
    Nashville, TN
  9. analogmike

    analogmike Gold Supporting Member

    Messages:
    6,233
    Joined:
    Mar 17, 2004
    Location:
    Connecticut
    the black wire from the wah pot is ground, needs to connect to the top right of the switch (seems to attach to the top left?)

    otherwise it looks ok, no need to mod the board on those.
     
  10. the_pedal_nazi

    the_pedal_nazi Member

    Messages:
    78
    Joined:
    Sep 6, 2005
    Mike is right, looks like you got the input grounded out... Cut the black wire off the switch...

    the pot is already grounded to the board.
     
  11. analogmike

    analogmike Gold Supporting Member

    Messages:
    6,233
    Joined:
    Mar 17, 2004
    Location:
    Connecticut
  12. the_pedal_nazi

    the_pedal_nazi Member

    Messages:
    78
    Joined:
    Sep 6, 2005
    Pic created and courtesy of cubba65


    [​IMG]
     
  13. K-man

    K-man Member

    Messages:
    1,061
    Joined:
    Feb 3, 2006
    Location:
    CT
    Looking at your switch as oriented in your picture Crybaby002, rewire it like this:
    Remove all the wires from the switch and discard the red and black wires.
    Solder a new wire between the upper left and upper right lugs.
    Solder the brown wire from the input jack to the middle left lug.
    Solder the white wire from the output jack to the middle right lug.
    Solder the green wire from the board to the lower left lug.
    Solder the blue wire from the pot to the lower right lug.

    That should take care of it.
     
  14. the_pedal_nazi

    the_pedal_nazi Member

    Messages:
    78
    Joined:
    Sep 6, 2005
    yeah, I was gonna say all this and that there is no need for shorting the input when in bypass... So...

    But here is a good diagram I found over on Fuzz Central for the exact thang you are talking bout... Phillip has a way cool site...


    Well the image isn't working, so here is the link...

    DPDT wah switch link
     
  15. stu2

    stu2 Member

    Messages:
    88
    Joined:
    May 12, 2006
    Location:
    Nashville, TN
    Thanks to all for the help. I rewired as K-Man directed but no dice. The bypass works but no wah/no sound when the switch is pressed. It may be that the switch is bad which I will check with a meter. I'll let you know.
     
  16. AL30

    AL30 Member

    Messages:
    2,985
    Joined:
    Jul 20, 2005
    Ok so the bypass is working now. That's one down. Take is systematically. You may want to take the switch out of the circuit after the continuity check. That's just one less thing in the circuit.

    Since you are modding your effects I have a word of advice. Build the
    DIY Audio Probe.

    http://www.diyguitarist.com/PDF_Files/DIY-AudioTester.pdf

    This will step you through the circuit piece by piece. Once the signal stops you've found your problem. I've debugged so many pedals with this that I've lost track. It's saved me countless hours of debugging and guesswork.

    AL
     

Share This Page