Table 4-2. Unit Troubleshooting - continued
TEST OR INSPECTION
DARNING SEWING MACHINE - continued.
UNUSUAL NOISE IN MOTOR.
Notify next higher level of maintenance of defective motor.
MOTOR DOES NOT PULL LOAD.
Check for loose, slipping, frayed or deteriorated drive belt.
Replace drive belt.
Use a multimeter and check that input voltage at power outlet is 110 Vac.
If voltage is low, check generator set for proper power output.
Rotate handwheel toward operator, check sewing machine for binding.
If sewing machine is not binding, notify next higher level of maintenance of possible