No, the servo pins use the same output pins as the extruder heaters. So disable the corresponding heater using M307 (e.g. to disable heater 7 aka E6 aka PWM_5, use M307 H7 A-1 C-1 D-1), then use the corresponding logical pin number in the M280 command. For heater outputs, the logical pin number is equal to the heater number; so M280 P7 Sxx would control PWM_5.
You don't need the 200uF capacitor, that is needed for large servos that are powered from the 5V pin on the servo connector.
