How to access the shuttle motor to troubleshoot alarms 113, 114, 125, 856, 859, and 2066: Remove the support arm cover  and cable channel cover . Measure the voltage to the power cable.
How to access the carousel motor to troubleshoot alarms 115, 127, and 854: Remove the cover  to the carriage. Measure the voltage to the power cable  on the connector bracket.
Measure the voltage:
Measure for DC voltage at the connector that goes to the motor from the I/O PCB. Adjust the range to 0.0 and set your multimeter for Min/Max. The power to the motor will only be on for one second before an alarm generates and the power is shut off to the motor. Command a tool change. The reading must be 135-165 VDC, or show a signal change when it is commanded to run. Some multimeters are not fast enough to read the voltage before the alarm occurs. It should still show a signal change or OL before the alarm is generated. If there is no voltage, refer to: