John Post Posted June 19, 2018 Share Posted June 19, 2018 I have a Roland RD-300s. Five keys don't work. The key contacts are not the problem. I have swapped the rubber contact strips but the symptom does not change. The key numbers/notes are: 5/C#, 13/A, 21/F, 29/C#, 37/A. Notice the repetition. It turns out the dead notes are every eight half steps. Octave Notes 1 5/C# 2 13/A, 21/F 3 29/C# 4 37A Looking at the shop manual diagram (SK-688) it looks like the actual piano sound waves must be going through the key switches. I see nothing telling the processor what octave is being hit. So the keyboard SK-688s must be physically combining all the octaves sounds??? I am confused. Help! Anyway, do you have any ideas what to look at? Quote Link to comment Share on other sites More sharing options...
mate stubb Posted June 20, 2018 Share Posted June 20, 2018 Could be a bad component in the key scanner matrix. Do you have a schematic which shows it? Quote Moe --- Link to comment Share on other sites More sharing options...
MIDI2XS Posted June 20, 2018 Share Posted June 20, 2018 I have a Roland RD-300s. Five keys don't work. The key contacts are not the problem. I have swapped the rubber contact strips but the symptom does not change. The key numbers/notes are: 5/C#, 13/A, 21/F, 29/C#, 37/A. Notice the repetition. It turns out the dead notes are every eight half steps. Octave Notes 1 5/C# 2 13/A, 21/F 3 29/C# 4 37A If 45/F and 53/C# are OK, then a break in a foil on the MID key contact board is possible. If those two keys don't play (in a addition to the five you listed), then a bad connection from the MID to the HI contact board could be the cause. Looking at the shop manual diagram (SK-688) it looks like the actual piano sound waves must be going through the key switches. I see nothing telling the processor what octave is being hit. So the keyboard SK-688s must be physically combining all the octaves sounds??? I am confused. Help! Anyway, do you have any ideas what to look at? Google "key matrix". See bottom of page 11... http://www.synfo.nl/servicemanuals/Roland/RD-300S_SERVICE_NOTES.pdf Quote Yamaha: Motif XF6 and XS6, A3000V2, A4000, YS200 | Korg: T3EX, 05R/W | Fender Chroma Polaris | Roland U-220 | Etc. Link to comment Share on other sites More sharing options...
pianojazz Posted January 9, 2020 Share Posted January 9, 2020 My RD-300 seems to be having the same problem - it's not the individual key depressed sensors but there seems to be no audio signal for a few of the keys - about 6 in a row. Did you manage to resolve this issue? How? What was the fix? Thanks Quote Link to comment Share on other sites More sharing options...
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