Hello my name is ***** ***** I am a Technics certified technician. The most common problem is the switches under the pedals. When you push a pedal down it activates a switch under it. That switch will go bad. There were two different switches that were used over the years. One looked like a rubber pad. If that is the one you can clean it with soap and water and then re-install it. The second one looked like a miniature micro switch. If it goes bad you would have to replace it. The problem is Technics is no longer around and there are no more parts. The one option you have is to switch it with one of the other switches down there. To access them you roll the cabinet on its side and remove the plastic case that holds them.
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Good morning, You answer request is still open so I wanted to check and see if you have the problem resolved or you need further ? Please let me know if you need more help.