I had the same problem and put all resistor networks correctly but now I have a problem with a button that keeps triggering constantly
3479587 1 – 151 84 127 8 C 6 Note On
3479659 1 – 151 84 0 8 C 6 Note Off
3479726 1 – 151 84 127 8 C 6 Note On
3479760 1 – 151 84 0 8 C 6 Note Off
3479863 1 – 151 84 127 8 C 6 Note On
3479897 1 – 151 84 0 8 C 6 Note Off
3479967 1 – 151 84 127 8 C 6 Note On
3480001 1 – 151 84 0 8 C 6 Note Off
3480036 1 – 151 84 127 8 C 6 Note On
3480070 1 – 151 84 0 8 C 6 Note Off
3480109 1 – 151 84 127 8 C 6 Note On
3480142 1 – 151 84 0 8 C 6 Note Off
3480176 1 – 151 84 127 8 C 6 Note On
3480211 1 – 151 84 0 8 C 6 Note Off
I had a realy hard time desoldering the resitor networks, so am thinking that i might have damaged one or two, I actualy disconnected the button but it just keep going, is this behavior due to something else?
I made a new thread with your post, so it won’t get buried or dilute the other thread…
This looks more like the serial clock line is shorted to an input than a bad resistor network, but it depends on the timing of the messages.
If it follows a solid timing pattern, Look for a clock or data line shorted to that input…If the timing appears more random, it -could- be the resistor on that input line is not connected (and the input is floating).
Well as far as the timing it is constant on-off-on-off but If I turn the unit off for a few minutes (20min) and turnit back on it doesn’t start to do that (on-off-on-off) after a minute or two
but am checking for those shorts in the circuit, I’l keep you guys informed
After a good inspection with a magnifying glass all tracks and soldering seem ok, I found something strange on Inputs (D7 and D6) of J6 with the multimeter every input reads 5V but D7 reads erratically from 2.4V to 4.4V and D6 reads constantly 2.8V. D7 is the one that is constantly triggering the note on/off, what should I do?
After a good inspection with a magnifying glass all tracks and soldering seem ok, I found something strange on Inputs (D7 and D6) of J6 with the multimeter every input reads 5V but D7 reads erratically from 2.4V to 4.4V and D6 reads constantly 2.8V. D7 is the one that is constantly triggering the note on/off, what should I do?
My first instinct would be to pull that 74HC165 chip and measure again to see if the readings are then stable…If it’s still wrong without the chip then it’s either the resistor pack or a soldering issue.
Considering these meter results and your close inspection, my bet is on the '165 chip.
I turn the unit without the 74HC165 chip and check the voltages they seem ok (5.3V) but after two minutes the voltage drops giving me the results I described earlier, am desoldering the resistor network and putting individual ones, in a few days I’ll repost with the results
That’s a bit of a suprise, this is an odd failure mode for a resistor pack…My money was on the chip as the cause. (he said while scribbling notes for future reference)
Let me know if the discrete resistors do the trick…
well I change the resistor pack for individual resistors, and the problem is still there, but I found something else, if I connect D0 of J6 to ground the notes on/off stop triggering constantly, although the only inputs that work are D4,D3, and D2, because the remaining either dont work at all like D1 or trigger 3 notes on/off at the same time like D5,D6,D7, could it be the 74HC165 then.?
am doing one of your Dinx4, and yes I changed all nine, I changed the registers and same thing.would it be wrong if, for now, I only use the 3 available inputs and leave D0 permanently grounded, would it cause some problems? am still going to check and recheck but I just want to know I have that option. Thank you so mucho for you help.
