This step will require a multimeter. If you aren't familiar with how to use one, here is a guide that will help you.

Disconnect the wire that is connected to the start winding that you located on the schematic. On this machine, it is aligned with terminal 3.

Measure the resistance from the start winding wire to the common terminal shared between the start and run windings. Use the lowest resistance setting (usually Rx1) on your multimeter if you need to set it manually.

The value should be 2–5 Ω. If it's outside that range or OL, the motor is defective and needs to be replaced.