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  • October 5, 2010 at 1:00 am in reply to: Small Stone rev. L repair #111819
    almost enough
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    K.

    I’m going to really dive in on that when I can get some alligator clips. I started doing a little bit of probing today, and I know there’s SOMETHING wrong, but can’t quite figure it out yet. I’ll double check over a schematic tonight and see if I can follow the signal path. I get lost on the board pretty easy. It almost looks like the signal splits and goes to a phasing section, then rejoins with the dry and gets sent to the output…and I get a dry signal through a lot of it, but the signal grows REALLY faint once it starts getting to the op amps, then it just pretty much disappears by the end of it.

    Is the board I have really close or the same as another revision that I’ve seen schematics for? I haven’t found one for this model, but there’s others.

    Again, thanks for the help. I’m learning a lot.

    October 4, 2010 at 10:53 pm in reply to: Small Stone rev. L repair #111817
    almost enough
    Participant

    I tested the op amps. I’m hoping I did it right. I measured with the ground on pin 4 and then the measurements on pins 6 and 8. Pin 8 was consistently 4.96 on all 5 of the op amps. Pin 6 was consistently ~2v, except for U5 which constantly changing. I’m not really familiar with op amps, but if I understand them correctly, it looks like this is about correct, right?

    I don’t have a capacitance meter, so I don’t know how I can test the output capacitors yet. I’ll probably be picking one up soon. C7 is the capacitor closest to the output…0.1uf. I’ll probably just try and replace that, since I can pick that up at the local Rat Shack.

    Thanks for the pointers so far. Still collecting dust, but I feel like I’m making head way on it.

    September 20, 2010 at 7:31 pm in reply to: Small Stone rev. L repair #111543
    almost enough
    Participant

    Does anybody have any input that I could use to at least get a little further on this problem?

    I tried all the ICs in different sockets to see if it affected the sound at all and it did not.

    I’m beginning to think that the problem isn’t in the ICs. I can hear FAINT phasing on the effect, but the effect volume drop is HUGE and there isn’t even a lot of background noise. Could the problem be in the voltage being sent through the pedal? Maybe a bad resistor?

    I’ve searched for a schematic for this pedal but to no avail. The values are written right on the PCB, so I can use that to an extent.

    If anybody has ANY ideas, maybe drop me a line?

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