Question about Music
I you mean the sustain type pedals, FIRST check the connector(s) as they often come loose or unseated. Next check for a broken pin in the connectors. It is UNLIKELY you could troubleshoot anything inside with just a meter. It appears that some of the Roland pedals receive 5 volts in the connector, and upon contact closure the voltage is sent back to the piano where it drives C4570 buffers with 680K to ground and an RF bypass cap and series 330 ohm to the + of the C4570's. The circuit I have is for a different piano but if yours uses the 8 pin connector it is likely the same.
The contact is actually optical interrupter modules with a driver transistor. There are threshold setting pots in the pedal assembly as well. The farthest I would suggest you go is to make sure the optical interrupter modules are free of dust if this is the type you have,.
Posted on May 28, 2011
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Posted on Jan 02, 2017
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