Vintage Synth Repair

--- In vintagesynthrepair@yahoogroups.com, scott frye
<painintheamp@...> wrote:
>
> That all sounds like it's routed in a secondary power supply problem
> They worked then...a whole bunch of stuff didnt work.
> I have a diagram for the thing it that would help.
> 
> Scott in Brrrrrrrrrrrrrrrrrrrrmont
> 
> SynthX SynthX <synth_guru@...> wrote:                                  
>  Hi
>   
>  I am also working on a Odyssey (mk2) which acts weird.
>   
>  The first problem is the keyboard, it triggers the envelopes and
all that
>  but no matter what key i press the tone won´t change. The keyboard
>  is recently cleaned (J-wires, cv and gate bus). Monitoring the CV
results
>  in a read out of 15Volts whatever key is pressed. I have checked the
>  wiring to the keyboard but everything is allright (CV wire to CV
bus and Gate
>  to Gate bus).
>   
>  The Octave range sellector worked at first try, but moving it now
makes no difference
>  (same octave whatever the sellector possition is in).
>   
>  The third problem is OSC 2. First it didn´t make a sound. Now it
does but at
>  LFO range, trimming the OSC 2 retrig pot on the PCB makes the OSC
go a little faster
>  but not up to audio range. attenuating the OSC 2 frequency slider
affects the tuning of
>  OSC 1 a little bit.
>   
>  This Odyssey has all new (tantalum and electrolytic) caps, sliders,
keyboard is cleaned 
>  and has had it´s bushings replaced.
>   
>  Has anyone on here ever had problems with the interconnection board
that connects
>  all of the frontpanel PCBs together ? Seems like the problems this
Odyssey has moves
>  arround a little. (I mean is the interconnection board known for
causing problems ?)
>   
>  Any suggestions ?
>   
>  Best regards,      
> 
> 
> ---------------------------------
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>      
>                                
> 
> 
>   Scott  Frye
> AudioFixation
> Consumer / Pro Audio Repair
> Southern VT 
> 
>   
> 
> 
> 
>        
> ---------------------------------
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>
Ive been working on my Odyssey Mk2 in my spare time, and after a good
cleaning (I washed the boards in the sink with soap and water)I put it
back together and did not have pitch control with my keyboard.If you
look at a schematic you will see 5 wires from the keyboard to the
synth; mine had only 4,the orange was not connected. I should note the
keyboard was not mounted in the synth at this time. After some head
scratchin( im not an electronics tech) i connected a wire from the
orange wire on the keyboard to the chassis and what do ya know, It
Worked!! The moral here is that the keyboard and synth make a ground
connection when bolted together. This might help. Paul