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Diode matrix Music keyboard
Diode matrix Music keyboard
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Old 27th June 2020, 11:16 AM   #1
argonrepublic is offline argonrepublic  Canada
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Join Date: Apr 2005
Location: Simcoe Ont
Default Diode matrix Music keyboard

I know this isn't exactly Audio but It is in control of the source. This is the MCU for a diode matrix for keyscan in a Yamaha P-85 digital Piano. Multiple B and C key keys were dead. I have beyond doubt determined the missing signal to be on conductor n15 pin 23 of CN301. My problem now is that I do not know how to check for key return. I believe. I need to use my scope but I need advice.
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Old 27th June 2020, 11:18 AM   #2
argonrepublic is offline argonrepublic  Canada
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Join Date: Apr 2005
Location: Simcoe Ont
Here is key decoder
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