Roland Juno 106 Waveshaper Module Schematic?

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CJ

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yeah, it's me. email activation would not work. something about a little bribe money,

i guess the new guys saw me as a security risk,

anybody ever dig into the problematic Juno synth wave shaper modules?

there is a clone built by Analog Renaissance


but it would be nice to have the schematic to maybe fool around with a DIY clone,

here is what i got so far, been trying to reverse it from pics of a clone on evilbay,

thanks for any help and good to be back!

values in red are speculation.106 - a.JPG
 

Tubetec

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Good to see you CJ , we thought you were lost forever , welcome back .

I did work on a Juno before , I think it was one of the oscillators I replaced with a modern reproduction near equivalent as far as memory serves me , didnt quite sound the same as the original but definately made a usable instrument out of it .

User and service manual can be found here ,

juno 106 SERVICE MANUAL | SynthXL - Service & Repair Manual
 

CJ

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chips ahoy! original modules IC 4,8 12 do not respond to acetone soak for removing conductive material like the VCO's do.

just measured the surface mount caps at 320 pf.
 

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CJ

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thanks tubetec, good to see you!

here is the schemo for 1/2 the module without part values.

clones use TL074 quad opamp and D flip flop
 

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Tubetec

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Cripes surface mount components back in the early 80's , that was some cutting edge shit back then ,
I think I ordered the replacement voice board from Analog rennaisance , worked out ok .
Still though you might be able to make your own up too ,
 

CJ

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thanks Whoops and Jake! good to be back!

they sell T Shirts with the 5534 on it>
 

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volker

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Hey CJ, I reverse engineered one last year. It's built and verified.
 

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CJ

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Holy Cow what are the odds on that! Thanks Volker! I had that 121K at 0 ohms because the SMD part was hard to read, did not know if it was 060 or 090 or 09D etc

did not know why they would use a 1% resistor at that point.
 

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