Question about Yamaha 88 Key Digital Piano w Stand YPG635B
Just another thought about this issue. Have you already checked if it has cable breaks or if the contacts get dirty inside. There are two possibilities that sometimes caused this issue, either footswitches go bad or a dirty contacts. Here are some steps that you may apply for additional troubleshooting. Hope it may help you.
1. First, you can simply disassemble the system and clean it (specially the contacts).
2. The other thing is the polarity, sometimes keyboard read new polarity due to power glitches. Most of the time it can be very dirty at venues so please check the power.
3. Check the power cord connector. Sometimes the power cord connector can become marginal causing momentary power loss.
Hope it helps.
Thank you for using FixYa.
Posted on Mar 23, 2011
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Posted on Jan 02, 2017
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