I replaced the actuator and plugged the old motor into it. when powered up the motor did nit run. I unplugged it and plugged in the new motor(being careful to get the wires right). It did not work either. The ‘on’ light of the actuator board comes on steady but the other board light blinks. I have a duplicate system where I then plugged the new motor in and it works OK. Did I screw up the board when I connected the old motor to it?
Are you trying to operate the 5645 servo like a normal DC motor? If so, that would not work at all. Since you indicated “Arduino”, you need to use the servo library to control the servo. Note too that the red wire and ground need to go to an external 4.8V to 6V power source (wall adapter or battery pack), and the GND (black) wire need to be split between that power source and the Arduino’s GND. If you can provide some photos of your setup, as well as the code you are running, we’ll see if we can find any issues.
I am operating the 5645 like a normal DC motor. The red wire goes to the 5v plugin and the black wire to the ground, both on the lower line of ports on the Arduino. The yellow wire goes to the No.9 port on the upper row of ports on the Arduino. My voltmeter reads 5v between the black and red wires. It reads 0v between the yellow wire and ground. The light on the right middle of the Arduino is on and steady, while the light on the left side of the Arduino is blinking. Pressing the reset button does not change anything.
The 5645 is an RC servo motor and cannot be operated like a normal DC motor. Please read the following about how RC servos operate:
en.wikipedia.org/wiki/Servo_(radio_control
You may have already blown the servo.