Posted by: Uncle Dave
MAJOR tech question - PA900 - 10/12/18 07:21 AM
I doubt that any real kb techs monitor this forum, but here goes:
I changed the key contacts in my PA900, and after reassembling it, putting in the MANY, many screws, and figuring out how to make sure the keys don't bounce (there's a very specific way to reinsert the circuit board after you deal with the contacts), I powered it up to find ... a very strange anomaly. The bottom 2/3 of the keys function as they should, but starting at the top and going down, every 4th key will not sound. It's a cyclical pattern that repeats for more than an octave.
Can anyone think of a mechanical reason why this would occur? The contact strips come in lengths of 12 (and one of 13), so that kind of rules out any one strip as a target for my attention. The 1 in 4 dead key issue is a real brain tease.
I updated the OS, reinstalled the resources, and did everything I could think of to overcome a software issue. I have a sneaky suspicion that there's a loose wire, or ribbon, or "something" that I didn't connect correctly ... although I was pretty thorough as I unplugged and re plugged those things.
I'm baffled, and open to educated suggestions.
I changed the key contacts in my PA900, and after reassembling it, putting in the MANY, many screws, and figuring out how to make sure the keys don't bounce (there's a very specific way to reinsert the circuit board after you deal with the contacts), I powered it up to find ... a very strange anomaly. The bottom 2/3 of the keys function as they should, but starting at the top and going down, every 4th key will not sound. It's a cyclical pattern that repeats for more than an octave.
Can anyone think of a mechanical reason why this would occur? The contact strips come in lengths of 12 (and one of 13), so that kind of rules out any one strip as a target for my attention. The 1 in 4 dead key issue is a real brain tease.
I updated the OS, reinstalled the resources, and did everything I could think of to overcome a software issue. I have a sneaky suspicion that there's a loose wire, or ribbon, or "something" that I didn't connect correctly ... although I was pretty thorough as I unplugged and re plugged those things.
I'm baffled, and open to educated suggestions.