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  • August 2, 2019 at 7:51 pm in reply to: Old Polychorus: chorus and doubler modes not working #125426
    LuckyPierre
    Member

    So I replaced a bunch of flimsy wires. The effect works if i tap the trim pot with a metal tool. Then as soon as I touch the feedback knob or touch any of the pots to the enclosure it kills the effect again. I guess my next move is to replace the trim pot.

    August 1, 2019 at 9:10 pm in reply to: Poly Chorus Reissue *Help* Footswitch? #125423
    LuckyPierre
    Member

    I’m currently working on repairing one of these. Im finding a lot of the wires are kind of brittle. I’ve had two fall off while moving the board. You may want to try reflowing solder on the switch connections. If that doesn’t work I would remove the wires, strip back the plastic coating and resolder.
    Small Bear has the switches: http://smallbear-electronics.mybigcommerce.com/dpdt-316-b-pp/

    August 1, 2019 at 7:08 pm in reply to: Poly Chorus Reissue *Help* Footswitch? #125421
    LuckyPierre
    Member
    Quote:
    Quote:
    No effect when you hit the footswitch or does it kill the signal?
    Does it happen in all modes?
    Take off the back and post a photo of the inside, careful you don’t rip out the ground wire attached to the back plate.

    When I hit the footswitch to turn the effect on, sometimes it works but often it kills all the sound.

    To be more specific: when you hit the switch sometimes no sound will pass.
    When you do get signal through, is it only clean signal or are you getting affected signal?
    Does it do this in all modes?

    August 1, 2019 at 2:49 pm in reply to: Poly Chorus Reissue *Help* Footswitch? #125419
    LuckyPierre
    Member

    No effect when you hit the footswitch or does it kill the signal?
    Does it happen in all modes?
    Take off the back and post a photo of the inside, careful you don’t rip out the ground wire attached to the back plate.

    August 1, 2019 at 3:49 am in reply to: Old Polychorus: chorus and doubler modes not working #125418
    LuckyPierre
    Member

    I got a repro mn3005 to swap with the mn3008 to see if the chip was failing. When I started tinkering with the trim pot the chorus and doubler made came on and off intermittently when I tapped on the trim pot with the screwdriver.
    I put the original mn3008 back in and same thing happened. So I know the chip works now. Tomorrow I will try reflowing the trim joints.
    While poking around the green wire coming from the second output came loose.
    Anybody know where that wire is supposed to go?

    July 9, 2019 at 9:52 pm in reply to: Old Polychorus: chorus and doubler modes not working #125375
    LuckyPierre
    Member

    Cool thanks for the info, I’ll check that out!

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Viewing 6 posts - 1 through 6 (of 6 total)