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The Musician Forums => Guitar Central => Topic started by: barricade on October 08, 2015, 11:06:14 PM
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Hey guys, i need your help. I'm trying to DIY repair my broken pedal, it's a ProCo Rat II.
The Issue: No sound when engaged. There's a signal when bypassed.
here's what ive done so far:
1. replaced a capacitor (C2) which i thought was faulty.
2. i tried taking apart the footswitch, seems like it's mechanism is working perfectly.
i have multimeter.... but i dont know how use it. hahaha
i cant do electronics for [gooey brown stuff]. :lol: :lol: :lol:
so.. can anybody show me how to troubleshoot this pedal?
here are the gut shots & schematic
(http://i36.photobucket.com/albums/e46/sinosimelo/DSC_0408_zps8sr5lfuo.jpg)
(http://i36.photobucket.com/albums/e46/sinosimelo/DSC_0409_zps62jqqkng.jpg)
(http://www.electrosmash.com/images/tech/pro-co-rat/pro-co-rat-schematic.png)
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use an audio probe
(http://www.geofex.com/FX_images/audioprb.gif)
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up ulit! i need all the kindness and help i can get. :cry:
@cacophony hey thanks for this one. gumawa ako.. mas maganda sya kesa sa continuity tester, mas mabilis tumunog.
but the trouble is.. i dont know. what's going on.
i found a dead spot at Q2 going to the output.. though im not sure if that's what it think it is.
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see you tom sir.. :)
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mas ok parin yun OP07D → datasheet (http://www.analog.com/media/en/technical-documentation/data-sheets/OP07D.pdf)bro ano.. winner! (http://www.mysmiley.net/imgs/smile/happy/happy0158.gif)