Vintage Synth Repair

Ok.. put IC13 & IC11 in acetone for about 1 week
13 could be done but 11 was stubborn so I replaced the solution
and put back in for 1 or 2 days then ok.

I then noted the container I used was not really air-tight and could be
the acetone solution deteriorated as when I replaced it with fresh one
I got good result with the second IC. Now I got voice 1 & 2 back, good.

However now I have a hanging note faded in the background as soon as synth switched on
(as originally as before besides voice 1 & 2).
Do I have to deal with all these ICs or I could use Test mode to pin point the faulty one?
Thanks for help!
Noel


From: Malte Rogacki 
Sent: Thursday, May 23, 2013 10:30 PM
To: vintagesynthrepair@yahoogroups.com 
Subject: Re: [vintagesynthrepair] Roland Juno 106S - note stealing ??

  
Sounds like the typical chip problem.

Run the following test: Power up the Juno while you hold the "Transpose"
button down. The press bothe "Poly1" and "Poly2" at the same time so both
lights are up. Press "Bank 2" and then press any note six times. The active
voice is displayed in the readout. You'll see which voice is dead.