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Ancient Geek · 20th Nov 2017, 9:35 am

I think it's most likely that the EEPROM is used only to store configuration data. All the code will be in the microcontroller which, by the way, has a mask ROM. A quick question for you:

The microcontroller is a PLCC package. Is it soldered in, or in a socket? If the latter, some cleaning might be in order.

20th Nov 2017, 9:35 am	#18
Ancient Geek Retired Dormant Member Join Date: Aug 2017 Location: Bristol, UK. Posts: 136	Re: MIDI keyboard fault I think it's most likely that the EEPROM is used only to store configuration data. All the code will be in the microcontroller which, by the way, has a mask ROM. A quick question for you: The microcontroller is a PLCC package. Is it soldered in, or in a socket? If the latter, some cleaning might be in order.