Question about Yamaha Full-Size Keyboard
Posted by Anonymous on
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Posted on Jan 02, 2017
Wild guess of possibilities.
1. Internal backup battery exhausted.
2. Button OR key is stuck down, either mechanically or electrically.
Posted on Jan 06, 2010
The wire from pin 1 or 7 of CN1 on the GHL88L (left end) circuit board is open where it goes to the middle circuit board. This could be a bad cable, improperly seated cable connector, or a crack in the circuit board(s) connecting to these wires. These are the common matrix wires associated with only the C# and G keys for the left 1/3 of the keys. If more than 1/3 is dead, then the problem is likely on the middle board GHL88M that connects to the mating cable to the CN1 connector.
There are two wires dedicated to the keys for the two contacts that are used to measure velocity of the key strokes. There is a mechanical position between closing the contacts and the time is measured by the processor as velocity.
If you are the least bit worried about working on electronics you best have a service person do the repair. The keyboard has to be lifted out after removing the top and disconnecting other cables.
Posted on May 03, 2010
I have the same Problem since yesterday my granddoughter hit the keyboard too heavy. I have opened it (many screws...) but could not find any obvious reason. Nothing like a loose connector.
Posted on Jul 23, 2010
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