Step 1) Opening the 3P - After removing the four screws located in the end panels and the 4 screws on the underside at the rear the top can be opened.
Step 2) Removing the main board. Remove the screws securing the keyboard from the underside of the JX-3P so the keyboard can be moved forward and give access to
the main board. Remove the 8 screws shown in Photo 1.