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How can I fix a pitchbend that doesn't work at all on a ROLAND JUNO 2?

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Some have found that doing a "Factory Reset" has cured an inoperative pitch bend control.

If that doesn't work, inspect the control for mechanical damage and replace broken parts as needed.

Posted on Mar 22, 2011

  • vangelismusi Mar 22, 2011

    I have tried factory reset, but no luck, also I don't see any physical damage anywhere?
    Maybe some kind of chip went bad? but which?

  • Fred Yearian Mar 22, 2011

    The pitch bender is a special potentiometer with a center tap.

    Here is schematic:

    Scroll down to the small link "Get Manual" and download this PDF file.

    The pitch bender is on page 13 of it in the upper left corner. The same A-D convertor is used for four things including the pitch bend, modulation, after touch of key pressure, and the jack board which is probably for a volume pedal. You should test EACH of these functions to see if they are working... if they are, then A-D chip is PROBABLY OK and the problem is with the pitch bend pot, voltages to it or wiring. ALSO it is possiblle that some voices do not ALLOW pitch bending so verify that possibiliity.
    The pitch bender really looks like a wierd way to do it... for sharping the pitch they send a increasingly positive signal up to 5 volts (if pot reaches end of travel) to the A-D convertor... but then for flatting the pitch they send a pulsed or chopped signal that goes up to about 5 volts. (if pot reaches end of travel) The pot probably doesn't go that far but at the extremes maxes out at 2..5 volts since that is the reference voltage of the A-D convertor. I have never seen this method used to identify the direction of bending... You will need a scope to troubleshoot this. On one end of the pot (#) you should find 5 volts plus, the other end (flat) you should see a square wave or pulse with a 5 volt swing. You will need a scope to check the flat direction but the other direction you can use a multimeter to measure the swing... it should go to almost 2.5 volts. If it doesn't go to zero at the center, then the ground to the pot has failed. Since I don't know the duty cycle of the pulsed, we can't assume anything of what the flat direction might measure.



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