Question about Electro-Harmonix Memory Boy Analog Echo Chorus Vibrato Pedal

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I was told that I can find the Electro-Harmonix Memory Boy schematic at the Studer Archive Service website. Pls can you let me know the website

When I on the unit, the power indicator LED is on, but there is no effect, none of the 4 knobs have any effect. I need a schematic to help solve this problem

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Chorus on- no problem- noise free. Chorus off- big problem- massive hum. This item is supposedly "new" (stupid me, I bought from Ebay...)

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It stopped working and smelled burnt

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