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Roland JX 3P synth, 1983
Stored indoors for some years and then powering up, missing notes and
some top panel sw functions missing. full sm here http://www.synfo.nl/servicemanuals/R...VICE_NOTES.pdf same 2 notes ,not each octave , but as keyboard is scanned as 8x8 matrix keys 8n and 8n-2 are missing , n= 1 to 8. Hopefully that means the 74LS138 3 to 8 demultiplexer did not survive 1/3 century,internal metalisation creep or something, rather than main micro problem. |
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