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you can find a Juno-6 service manual here:
http://fa.utfs.org/diy/rolandjuno6/Rola … ervice.pdf
the pulse width signal comes from the back panel via a connector. The signal is called ‘MULTI PWM CV’, seen on page 15 coming from panel board A.
A first step would be to check the connector and measure, if the signal arrives in the voice board. You should be able to use a multimeter for that.