Table 4-2. Unit Troubleshooting - continued
TEST OR INSPECTION
BUTTON SEWING MACHINE
LAMP DOES NOT LIGHT.
Check that light bulb is broken.
If light bulb is broken, unplug power cord from outlet, remove old bulb and replace.
Unplug power cord from outlet and inspect for frayed or broken insulation and wires.
If cord is frayed or broken, replace lamp (para. 3-12).
MOTOR DOES NOT START.
If power is not present, the power or distribution cable may be defective. Test cables (para.
4-60 and 4-61).
If power is present, notify next higher level of maintenance that motor or switch may be
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 (para. 2-8).
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 a possible