Juno 106 80017A VCA/VCF

[be053520]

-----Original Message-----
From: Jim Battin <PlanetZ at mediaone.net>
To: synth-diy at mailhost.bpa.nl <synth-diy at mailhost.bpa.nl>
Date: vrijdag 29 oktober 1999 8:48
Subject: Juno 106 80017A VCA/VCF


>I guess this falls under DIY, since I'm doing my own repair work here...
>
>I recently snagged a 106 pretty cheaply ($80) with 2 dead voices and 2
>busted keys
>How much do they 80017A's cost,
Here in Belgium it WAS about 811,-BF (times 30 for $ ????)

 and where can I find them (purchase)?

At Roland they 're sold out !!! Probably they're still available at other
Roland service centers!

>And is there anything else I shouyld be aware of when removing and
>installing the knew ones?


Yeah, ask for working
rids!!!:-( 
Sometimes the voicing chip doesn't work completly anymore (especially on second hand markets!!)and results in a bad (or not) working envelope ,no resonance, etc... for that  voice!!!


>PS:  The 80017A is the VCA/VCF Correct?  I was told by the guy i bought
>it from those were the ones that are dead.  Is there any way to check?


Yep, the 80017a is a voicing chip (VCF/VCA)! Mostly a broken 80017A results in "leaking" sound while no key is pressed (could be adjustment too), no resonance, no tracking, but I've never had one that was completly broken and wouldn't give any sound.
It always resulted that the DCO chip was broken and sometimes even in a bad working opamp/multiplexer control (=> for adding the CV to the right voice/oscillator).

Maybe you should check that first before replacing any device!
 

Greetings to all

Tom Verheyden.