Home › Forums › Vintage EHX › Deluxe memory man- No delay/chorus

Viewing 11 posts - 1 through 11 (of 11 total)
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  • February 9, 2014 at 10:22 am #83346
    donbenjy
    Member

    Hey,

    So I have a 2007 deluxe memory man that’s been regularly gigged with since then, and today I noticed it’s stopped working. Power comes on, and the preamp section works, but there is no delay sound or chorus at all.

    I’m guessing this means the BBD chip is dead, cos everything else works.

    Does anyone know what it’s likely to cost to get it fixed if I send it back to EHX, beating in mind I’m in the UK.

    If it is the BBD and I could possibly source another then I could repair it myself too.

    Thanks
    Ben

    February 9, 2014 at 4:10 pm #119673
    The EH Man
    Moderator

    I would suggest finding a local tech to look it over. There may be something else wrong instead of a BBD.

    February 9, 2014 at 4:55 pm #119674
    Scruffie
    Member

    I’m in the UK and can take a look.

    I very much doubt it’s the BBD.

    February 9, 2014 at 5:02 pm #119675
    donbenjy
    Member

    Where are you based? I’ve not had a chance to pop the lid off yet.

    It’s only lack of a scope (and an accurate schematic) that’s stopping me from trying to fix it myself- I was an engineer at Laney, but with no scope I’m not sure how much diagnostics I can do!

    I was wondering if it’s the regulator (or a buffer stage), depending on how the power LED is wired…

    Thanks
    Ben

    February 9, 2014 at 5:53 pm #119676
    The EH Man
    Moderator
    Quote:
    Where are you based? I’ve not had a chance to pop the lid off yet.

    It’s only lack of a scope (and an accurate schematic) that’s stopping me from trying to fix it myself- I was an engineer at Laney, but with no scope I’m not sure how much diagnostics I can do!

    I was wondering if it’s the regulator (or a buffer stage), depending on how the power LED is wired…

    Thanks
    Ben

    I’ve not used a scope for repairs in years, just an audio signal tracer.

    February 9, 2014 at 8:30 pm #119677
    Scruffie
    Member
    Quote:
    Where are you based? I’ve not had a chance to pop the lid off yet.

    It’s only lack of a scope (and an accurate schematic) that’s stopping me from trying to fix it myself- I was an engineer at Laney, but with no scope I’m not sure how much diagnostics I can do!

    I was wondering if it’s the regulator (or a buffer stage), depending on how the power LED is wired…

    Thanks
    Ben

    It can likely be repaired without a scope as the EH man said, just taking the voltages with a DMM might reveal the culprit.

    I have the factory schematics if required.

    February 10, 2014 at 6:39 pm #119680
    donbenjy
    Member

    Schematic would be awesome if you wouldn’t mind PMing me?

    February 11, 2014 at 11:34 am #119685
    Scruffie
    Member

    This should be close enough actually, some minor differences between it and the modern schematic but it’s completely verified.

    EHXDMM-Factory.jpg

    February 11, 2014 at 11:38 am #119686
    donbenjy
    Member

    Thanks- I was wondering about a power supply issue, so was looking for one to avoid tracing those tracks around the relay etc, however when I plugged it in last night it worked fine! Visually inspecting the pcb shows no signs of burnt ICs, and all the off board wiring seems sound! Pots look/sound fine and work in all positions, so I have no idea what could’ve caused the issue!

    Thanks for the help anyway!
    Ben

    February 11, 2014 at 5:53 pm #119688
    Scruffie
    Member

    Could be a dodgy solder joint somewhere.

    January 5, 2021 at 9:30 pm #126721
    linuquix
    Member

    Open the pedal, and remove one of the chips of BBD circuits, and put them again.

    Worked for me, my Memory man delay bottom wasn’t worked at the time.

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