[sdiy] Roland JX-8P upgrades?

[Simon Gatrall]

I posted a similar message to Analogue Heaven, but I haven't received 
any replies so I thought I'd try here....

I have a Roland JX-8P and it has a few problems:

1. I hadn't touched it in a while, and the keyboard was quite flaky. 
I looked through the Analogue Heaven archives and came to the 
conclusion that Caig DeOxit was one of the preferred chemicals, but 
alcohol would also work.  Since I don't have any DeOxit around, I 
went with alcohol.  The contacts all seemed to have a little black 
oxidation on them.  I couldn't completely get rid of it, but running 
a q-tip with alcohol over them made a world of difference.  Any other 
opinions?

2. The outputs are always noisy (forget turning on the chorus - it 
might as well be labeled "white noise").  I don't think it is 
anything particularly unusual for JX-8P's, but it bugs me and makes 
me want to sell it.  Are there any obvious mods that would lower the 
noise floor?  When I had it open to clean the key contacts, I noticed 
a lot of nasty looking older caps, but I'm not quite sure where to 
start, or if this would even fix much.  I assume there are some 
crappy op amps as well, but I would need a schematic and a little 
more guidance to tackle this problem.  Help?

3. The envelopes aren't very snappy.  Is there any way to mod this? 
I assume this would be a much more difficult mod.

4. Like many other JX-8P's, this one's aftertouch is basically shot. 
I found this procedure:
http://analog.no/mods/roland_jx8P_aftertouch_repair.htm
Is this really the best way, or is it still possible to buy 
replacement aftertouch sensors?
-- 
Simon Gatrall
gatrall at pacbell.net