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Old 09-01-2017
fairdeal fairdeal is offline
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Join Date: Feb 2014
Posts: 1,562
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thinking about your single "blue & yellow wire" - wondering if it could be the Diagnostic Flash Indicator lead -
which is blue/white - but perhaps yellowed

is this it?



if so, that does not get plugged into anything,
except a special Yamaha test light for diagnostic purposes
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