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4. Use a pencil and trace the outline of the X/Y Home PCB on the top of the Y-drive timing belt
clamp.
5. Disconnect the harnesses from the PCB connectors and set the harnesses off to the side of where
they were disconnected from. Do not get these two harnesses mixed up with each other. Mark
them with tape to prevent confusion between the two harnesses.
6. Loosen and remove the two M3x6mm cap head socket screws and M3 at washers.
7. Remove the X/Y Home PCB and replace it with a new one.
8. Align the replacement PCB to the marks you traced on the Y-drive timing belt clamp.
9. Tighten the screws just enough to hold the PCB securely. Examine the position of the y-home ag
between the optical sensors and make sure that the ag is centered and does not hit the sensors.
If adjustment is needed, loosen the PCB and move it one way or the other to center the ag and
tighten the screws just enough to secure the PCB and recheck the position of the ag again.
10. Tighten the screws to the minimum Torque Specication (10% less than specied for the screws).
11. Turn the machine ON.
12. Install any size hoop with one piece of backing.
13. Select the appropriate size hoop in the Melco OS.
14. Measure and mark the center of the hoop by measuring from the left and right and front to back
inside border of the hoop. Place an “X” mark on the center location on the backing.
15. Click on the “Commands” menu in the Melco OS main menu, and then on the “Set Home” and
then center the hoop.
16. Click on “Tools>Maintenance” menu in the Melco OS main menu, on the “Head Timing” menu,
and then on the “Bottom Center” button.
17. If the needle is off front to back, adjust the X/Y Home PCB from Step 8, moving it in the direc-
tion and distance that the needle is off center front to back and tighten the screws to the torque
specications.
18. Reinstall the covers you removed in step 3.
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