Hello, and thanks for reading this post,
I have a Roland D-10 Synthesizer that plays all the keys after you power the unit up. But if you press E,F,Gb,G,Ab,A,Bb,B. on the second to lowest octave they play once at a maximum of 127 velocity and sustain at that velocity until the unit is restarted. I have cleaned all the contacts with no change. All the other keys always play. (The unit plays perfectly normal through a midi keyboard.)
I tried heating up the Gate array chip (63H149), which is the key scanner, and the one that the 3 cables for the keyboard connect to, I thought re-flowing the chip may help, but there was no change. I tested 2 the capacitor arrays near the chip and they tested fine, as well as the resistor arrays near the chip, and all were good.
Well it may be possibly that the gate array is at fault I wanted to ask the people of this forum, if there were possibly other areas on the motherboard I may have overlooked? I really don’t think it’s the keyboard itself because I’ve tested every diode with a meter, and cleaned the contacts thoroughly.
Thank you very much for your time, and for any responses.
I have a Roland D-10 Synthesizer that plays all the keys after you power the unit up. But if you press E,F,Gb,G,Ab,A,Bb,B. on the second to lowest octave they play once at a maximum of 127 velocity and sustain at that velocity until the unit is restarted. I have cleaned all the contacts with no change. All the other keys always play. (The unit plays perfectly normal through a midi keyboard.)
I tried heating up the Gate array chip (63H149), which is the key scanner, and the one that the 3 cables for the keyboard connect to, I thought re-flowing the chip may help, but there was no change. I tested 2 the capacitor arrays near the chip and they tested fine, as well as the resistor arrays near the chip, and all were good.
Well it may be possibly that the gate array is at fault I wanted to ask the people of this forum, if there were possibly other areas on the motherboard I may have overlooked? I really don’t think it’s the keyboard itself because I’ve tested every diode with a meter, and cleaned the contacts thoroughly.
Thank you very much for your time, and for any responses.