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#459529 - 10/12/18 07:21 AM
MAJOR tech question - PA900
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Senior Member
Registered: 12/01/99
Posts: 12800
Loc: Penn Yan, NY
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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.
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No longer monitoring this forum. Please visit www.daveboydmusic.com for contact info
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#459545 - 10/12/18 10:58 AM
Re: MAJOR tech question - PA900
[Re: DonM]
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Senior Member
Registered: 12/01/99
Posts: 12800
Loc: Penn Yan, NY
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After talking with Fran, I ruled out a motherboard issue. The sounds and features all work, EXCEPT those few keys I mentioned. This is most likely a short, or crack in the circuit board. MIDI works as it should, as do the recorder, players, rhythms and sounds. "SOMETHING" in the keybed, or connections has failed. I retired the unit to sit atop my Rhodes and serve as a sound source, a monitor amp/speakers, a quick MP3 recorder, and general cool stack topper. How's it look? (The kb stuffed in the middle is a Korg i5s that I got from Boo. It serves as a controller for the 900, so I don't have to reach) I play bass lines, and accent sounds on that, while I comp on the Rhodes. Like the old days
Attachments
IMG_8517.jpg (9 downloads)
Edited by Uncle Dave (10/12/18 11:00 AM)
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No longer monitoring this forum. Please visit www.daveboydmusic.com for contact info
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