Question about Yamaha Music
Posted by Anonymous on
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Posted on Jan 02, 2017
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
Download the owners manual from here and try doing a reset to factory settings
Posted on Feb 18, 2011
SOURCE: My new Yamaha DGX-230 keyboard
One of the key scanning matrix wires is defective someplace between the key contaact and the receiving circuit. Since this is brand new, the costs should be handled under warranty since you say the keyboard is new. I have downloaded the service manual:
Scroll down to "Get Manual" and click on it to download. On page 61 is the keyboard contact diagram. I woudl appear that if a matrix line is bad, the the D# notes should ALSO be bad.
Since this is new, I would not attempt to repair it. Call the distributor regarding the return oor repair... they MAY have an authorized repair facility. If the D# notes are OK, then the problem is deep in the unit... This is ALL based on the symptoms you have given..
Posted on Apr 30, 2011
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