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Thank you very much! I don't have a multimeter right now, but I'll definitely do it as soon as I get one. In the meanwhile I bought an "Alesis SP-2" Universal Sustain Pedal, it has a polarity-change switch, and it has been working perfectly so far.

Hi! I have the same problem. The original sustain pedal was a DS-2H. I bought a DS-1H damper because de DS-2H was no longer available at the store. The new pedal doesn't work either, it just does half-pedaling. Have you found a solution so far?