My home organ has a stack of four Fatar TP60L keyboards. Each keyboard connects to a Doepfer MKE MIDI processor via two ribbon cables with 16 way MicroMatch connectors.
A couple of keyboards have recently intermittently started to lose notes, including annoyingly the bottom keyboard. Specifically, one is losing eight chromatically adjacant notes, and the other is losing four notes each of which is eight chromicatic notes from the next. I am wondering if a single faulty connection is causing eight notes to drop out due to the matrix diode system.
Can anyone kindly advise what to consider when diagnosing and fixing such a problem? I am aware that individual keys can be removed and contacts cleaned but the pattern of notes makes me think the problem lies somewhere other than under each missing key. I have pulled out and reconnected all keyboards but after a while the problem recurs. Sometimes when playing the fault disappears for a while, suggesting that a hard thwack somewhere might at least temporarily make the contact work again but that isn't a long term solution. As it takes several hours to take the organ apart to reach the MIDI cables and a few hours more to reassemble it, it would be helpful to have some idea of what to work on and what spare parts might be needed before I take it to pieces yet again. Obviously when I have done so before, the act of taking apart and reassembling makes everything work again...for a few weeks!
A couple of keyboards have recently intermittently started to lose notes, including annoyingly the bottom keyboard. Specifically, one is losing eight chromatically adjacant notes, and the other is losing four notes each of which is eight chromicatic notes from the next. I am wondering if a single faulty connection is causing eight notes to drop out due to the matrix diode system.
Can anyone kindly advise what to consider when diagnosing and fixing such a problem? I am aware that individual keys can be removed and contacts cleaned but the pattern of notes makes me think the problem lies somewhere other than under each missing key. I have pulled out and reconnected all keyboards but after a while the problem recurs. Sometimes when playing the fault disappears for a while, suggesting that a hard thwack somewhere might at least temporarily make the contact work again but that isn't a long term solution. As it takes several hours to take the organ apart to reach the MIDI cables and a few hours more to reassemble it, it would be helpful to have some idea of what to work on and what spare parts might be needed before I take it to pieces yet again. Obviously when I have done so before, the act of taking apart and reassembling makes everything work again...for a few weeks!