Roland JX-3P, Manual

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37
Optional Fixes for the JX-3P
The following are optional modifications that can be made. The first changes the way the LEDs are powered which will reduce the flickering that occurs as LED are
changed on the display. This is more noticeable once the KiwiTechnics Upgrade is fitted due to the enhanced use of the LEDs.
Step 1 Remove the front panel board. To do this it will be necessary to remove the Jack
board to allow access to the mounting screws for the front panel. This is done by
removing the four screws on the rear of the 3P. The front panel can then be removed
by removing the slider knobs and then undoing the mounting screws.
Step 2 Remove all of the nine 100R resistors identified with arrows. The photo shows these
already removed.
Step 3 Place a link in place of R84 which is identified by the yellow arrow and fit the eight
supplied 220R resistors to the eight green arrow locations. There is a resistor
numbering error in the service manual so use the photo as your guide.
Step 4 Replace the front panel board, the rear jack board and front panel knobs
The second modification improves the stability of the Sens slider. On my test 3P I had noise issues
with the Sens pot which caused it to be noise prone and jumpy. This can be improved by fitting the
supplied 0.1uF cap to ground on the junction between the Sens Edit Pot slider connection and R95.
This is most easily fitted on the underside of the front panel board as shown in the photo. The Sens
Pot is located near the center of the front panel board and has the word 'EDIT' next to it.
www.kiwitechnics.com 3P Upgrade User Manual v400