Home › Forums › Help/Technical Questions › Need help with vintage Deluxe Memory Man

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  • April 4, 2010 at 8:25 pm #80131
    Voyager
    Member

    Hello! New member here, I recently picked up a DMM from a guy who said it had some problems.
    The first being a faulty intermittent power switch. I rewired the switch but it’s the switch itself that is bad. When the switch is working I don’t get any effect at all from this unit, the only control that does anything at all is the level knob, which when turned up the signal begins to distort. Anyone have any ideas as to where I should look for the problem? It does appear that the trim pots have been messed with since the seals have been broken on the underside of the board. Thanks in advance!

    April 5, 2010 at 10:35 pm #109039
    The EH Man
    Moderator

    Even if the delay ICs aren’t passing signal you should get a clean sound at the minimum setting of the Blend control. If you’re not getting that, then the 1st op-amp stage is bad or there’s a broken wire, broken trace, broken pot, or something.

    April 11, 2010 at 2:01 am #109184
    Voyager
    Member

    Thanks for the reply, I’m sorry I failed to mention that the blend control is working as well and I do get a signal when plugged in just no effect at all. No chorus/vibrato or delay.

    April 11, 2010 at 2:16 am #109186
    Voyager
    Member

    Also, the overload led light inly lights up briefly when the footswitch is engaged then doesn’t light up at all after that.

    April 11, 2010 at 2:17 am #109187
    The EH Man
    Moderator

    Someone has probably screwed the trimpots up. You should have it looked at by someone who knows how to set them.

    April 11, 2010 at 2:24 am #109188
    Voyager
    Member

    Yeah, I’m a little low on dough right now or I probably would have sent it to someone already. Makes it ever so tempting to fiddle with the trims myself.

    April 13, 2010 at 5:26 pm #109277
    Howard Davis
    Member

    It requires an oscilloscope, audio oscillator, the test/alignment procedure, and experience as a technician to properly set the trimpots. Without these, it should not be attempted as you’ll probably just make things worse. I designed the Deluxe Memory Man, and I certainly can restore yours to sound and operate like new.

    Please email me privately at howard.davis2@att.net.

    Guitar pedal design engineering, repairs, and custom mods:
    http://howardmickdavis.com

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