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Boss OS-2 problem - please help!

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  • Boss OS-2 problem - please help!

    Please check this out:



    The problem, as the video demonstrates, is that the sound rather randomly cuts out completely and sometimes drops in volume. Giving it anything from a slight tap to a few moderate bangs fixes the problem... but it also causes the problem; i.e. the pedal's working fine, has a light nudge and cuts out. There are other times when banging and shaking the pedal causes no problems whatsoever.

    I've had the Boss OS-2 for approx. 17-18 years and as far back as I can recall I've had this problem, which is why I've only recently picked it up again.

    I recently opened it up and took everything out of the pedal casing to check the input and output jacks, and I couldn't SEE any problem (e.g. bad soldering, loose wires or rust).

    However, while in this state I connected the pedal to a 9v battery to test the unit and there was no sound except for a loud hum. I suspected this may be due to it being out of its metal casing - although I have no idea why/how this would affect anything - so I put it back inside the casing and it's back to its usual self; i.e. sometimes a bump causes the sound to cut out and it needs another bump or three to return to normal.

    Anyway... What I want to know is if anyone knows: 1) what's causing the problem; and 2) how I can fix it.

    I'm relatively inexperienced with electronics (e.g. I've diagnosed and fixed a laptop screen problem by replacing the backlight, so I can follow basic instructions) but I'd rather try to fix it myself before contacting an expert.

    Thanks in advance for any help you can provide.


  • #2
    You can look again, tap the inner parts using something pointy, you'll find a broken/breaking lead, loose jacks, cold solder, etc. It's sometimes hard to find, but that's likely a mechanical problem. If the opamp is in a socket, push it again into it, maybe it's a bit loose.

    Edit: Bat potentiometers are most likely in these cases. Tap their head one at a time instead of bumping the entire pedal.
    Valvulados

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