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Posted on Jan 02, 2017
USUALLY the keys are matrixed in groups of 8 starting at a "C".
Each key USUALLY has two contacts. The differential time between the contacts closing is measured as "velocity" which is used to control the amplitude of the sound. The matrixing of the keys may be done in any of several ways but usually the bank busses are driven and the keys outputs are merged with diodes. You really need a schematic and Yamaha will usually supply the service manuals on CD for about $15.
If conductive rubber contactss are used, those should be cleaned with 99% isoprophyl alcohol. DO NOT USE CONTACT CLEANER !!!!!
Also clean the traces the contacts contact.
When a bank of the 8 keys are dead, you MAY have a broken trace on the coircuit board or a broken cable wire. Be careful inremoving ribbon cables as the end wires are pulled from the contacts unless the pull is distributed across the cable.
Posted on Sep 22, 2009
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