Vintage Synth Repair

Hello,

 I have a Roland SH-101 that I use to control my Doepfer modular 
system via CV & Gate (not midi).
I haven't used it for a while, and I have noticed a problem when I 
tried to record with it yesterday. There is always a constant tone 
coming out of the Doepfer even when I am not pressing a key on the 
Roland SH-101.  I have the CV and gate going out of the SH-101 into 
the VCO and the gate of the ADSR of the Doepfer respectively. 

 It does play and change notes when I push the keys down on the SH-
101; it's just that there is always a tone coming out of it when 
there are no keys being pressed. I have played the Roland SH-101 by 
itself, and everything seems to work. There is no sound coming out of 
it when there are no keys being pressed. (It is quiet when I am not 
pressing any keys.)

 Another issue I have discovered separately from using it with the 
Doepfer is that when I hook my Roland TR-606 to the SH-101 I am 
unable to control the sequencer with the TR-606. (The sequencer in 
the SH-101 seems to work fine when used by itself when not connected 
to the TR-606) I have also tried another Roland drum machine (Boss DR-
110) to control the sequencer in the SH-101, but the same thing 
happens. So I feel it isn't the drum machine. 

I figure the problem may be with my Roland SH-101 and not the Doepfer 
or TR-606 since the 101 is always at the root of each hook-up. Does 
anyone here have any ideas what it might be? Or if it is something 
other than the SH-101? Or do I just have the Doepfer hooked up wrong?

Any help is much appreciated.



Thank you,
The Beatbox Gestapo