Tuesday, 14 July 2020

DOD American Metal

Another quick one. This American Metal would power up, pass a clean signal but wouldn't pass an effected signal.


Schematics are older DOD pedals aren't too hard to come by (I believe some of them were supplied in the original boxes). I suspected a bad switching JFET was blocking signal, but they all measured fine on the oscilloscope.


I found that two of the transistors near the distortion control had very little voltage on the collectors. The schematic shows a series 1k resistor and a 47uF capacitor from the 9V supply, so there's a good chance that capacitor is shorted.




The 47uF is right in the middle of the PCB. Pulling out brought back the effected signal, so I replaced it and put things back together.

This is a very cool pedal, definitely in the HM-2 family. Maybe not as much gain and not as much EQ control, but it certainly does the buzzsaw sound when turned up.

13 comments:

  1. Can confirm, I found the box of my dad's old fx65 and the schem was in there! Lovely days.

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  2. This comment has been removed by a blog administrator.

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  3. Thanks for sharing this valuable info regarding DOD Pedals !
    Wirelessecall

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  4. hello, haven't you fixed any mxr equalizer by any chance? It is a pedal that commonly starts to make noises like popping or cracking .. maybe you have some info, I know it has to do with the LEDs on the sliders .. but not much else. thanks in advance, I follow your blog, thanks for all the info you share.

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  5. I found this in a forum. Apologies if I am not appropriate, and more apologies for my English.

    " I had a very similar sounding issue with my MXR 10 band.
    Sent it to a local pedal builder to check.
    He said "The issue is in the LED circuit within the Faders, they leak voltage into the audio path.
    I can repair it but it will mean the LED's will no longer work, while I'm in there I can add a separate on/off LED located by the footswitch" thanks

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