The grabber function test will help to isolate mechanical and electrical failures of the grabber assembly. The two errors most likely to occur during this test are:
Grabber Stepper Index Error - the software is detecting that the grabber is not in a safe position when the needle begins to come down.
Grabber Timeout Error - the sensors fail to detect home within the allotted amount of time programmed into the firmware and software.
Test Procedures:
1. Inspect the grabber blade assembly for obstructions or damage.
2. Turn the machine ON and start the AMAYA OS ( AMAYA OS).
Figure 1 - AMAYA OS Steppers Menu
3. Before doing the function test, "step" the motor through its function and check for proper grabber adjustment. The grabber blade should touch the velcro on the upper trap assembly, but it should not depress the loops on the velcro pad. The grabber blade should also be completely parallel to the upper and lower traps. To "step" the grabber stepper motor incrementally through its cycle, click on the "Maintenance" menu in the AMAYA OS ( AMAYA OS), select the "Steppers" tab and click the "Step>" button in the grabber column, observe the movement and click it again for the next step. Repeat this to observe any obstruction or misadjustment. STOP if you observe any obstruction or adjustment required in the grabber assembly. Use the procedures referring to adjustment prescribed in "Grabber Blade Replacement" to adjust the grabber assembly.
4. If there is a failure in the "stepping procedure" or you find the problem, repair the defect or make the required adjustments and start this test again from the beginning.
5. If no failure is found, or you have restarted the test after finding an earlier failure, then click on the "Start Test" button under the grabber column.
Figure 2 - AMAYA OS Sensors Menu
6. Click on the "Sensors" tab and observe the grabber status. It should be alternating between "Open" and "Blocked". In addition, the grabber blade should be extending and retracting between the upper and lower traps without any obstruction or resistance. If all this is happening, everything in the grabber circuitry is good.
7. Return to the "Steppers" menu and click on "End Test" button to stop the test.
8. If you still get grabber related errors at this point, contact Melco Technical Support.
