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Figure 2 - Y-Motor Connections at PCB
3. Disconnect the Y-motor harness and y-hall/encoder harness from the Main PCB as shown in Figure
2 above.
4. Carefully cut any cable ties that tie Y-motor and encoder harnesses running underneath the y-mo-
tor through the lower arm access hole to the main PCB.
5. Pull the y-motor and encoder harnesses through the access port to the back of the machine and
let it hang free.
6. Loosen the four M6x20mm cap head socket screws to loosen the tension on the y-motor pulley,
then remove the screws, M6 split lock washers, and M6 at washers.
7. Pull the y-motor timing belt off of the y-motor timing pulley and let it hang on the drive pulley on
the y-drive shaft.
8. Remove the y-motor from the machine. (Do not disassemble the y-motor assembly any further,
especially if it is to be returned to the factory.)
9. Install the new y-motor in position and place the y-motor belt over the motor pulley.
10. Start the four M6x20mm cap head socket screws, M6 split lock washers, and M6 at washers
loose.
11. Pull up on the y-motor with about 30 lbs pull and tighten the M6x20mm cap head socket screws
to the torque specications.
12. Measure and reset the y-belt tension if needed. (Click on the link to get the procedures.)
13. Reinstall the covers you removed in step 3.
14. Turn the machine on and run a functional test on the machine, paying particular attention to y-ax-
is movements. Run this test until you are satised with the performance of the y-axis movements
or you discovered other problems in the test.
15. If the function tests are satisfactory, run the following sew tests on the machine:
• AMBTESTXXX.EXP (Belt tension test)
• AMRTESTXXX.EXP (Registration test)
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