From cadsi.com!kent@elvis.cadsi.comSat Apr 8 18:01:31 1995 Date: Sat, 8 Apr 1995 16:59:22 -0500 From: Kent Williams To: analogue@hyperreal.com Subject: alpha-juno-2 aftertouch mystery solved If you have an alpha-juno-2, it probably has lost it's aftertouch sensitivity. I finally took mine apart and found out why, and to my amazement, it was easy to fix. The aftertouch is provided by some sort of pressure sensitive resistor that's mounted between two strips of felt. If you play the hell out of your juno, you probably need to replace the filt, which involves taking the whole keyboard unit apart. My condolences. Luckily the problem was a lame design for connecting the aftertouch resistor to the main circuit. It is almost guaranteed to come out, unless you never move the keyboard. This juno has been back and forth across the country many times. An adventure with a cordless screwdriver in three acts. 1. They never make it clear how to take it apart. Then, it's a trick to reassemble it. Here's what you do: unscrew the screws that go around the perimeter of the keyboard, that anchor the plastic case. Then loosen the screws towards the back on the bottom that go into little dimples in the metal pan. Then unscrew the few screws on the back that aren't holding any of the interface connectors on. From the back, gently lift up, and then tilt the top of case back. The whole thing should come up and out, trailing bundles of wires. 2. Notice all the custom chips, and the 8053. A computing giant it aint. There are a whole slew of tantalizing trimmers labeled 'Filter Frequency Adjustment' Someone braver than I could try playing with those, but there's a lot of them (like 2 per voice), and I didn't really want to screw anything up. 3. On the left edge of the keyboard assembly, there's one of those funny flexible flat membrane cables. Corresponding to it is a little socket into which that flat cable is meant to be seated. If you've shipped or moved or bumped around the juno-2, most likely it has popped out. This is the connector for aftertouch! Plug it in, and carefully re-assemble the juno-2 and you've got your aftertouch back! -- kent.williams@cadsi.com -- All views expressed are. Sabado Gigante! "Someone please explain to me the guy in the bee costume on Univision!"