True Fitness 500U, 600R, 750U, 500R, 750R, 600U manual Ecb, Malfunction

Symptom	Probable Cause		Corrective Action
ECB	Control Panel	•	Power on unit. Check for 5VDC between pins 1 and 2. (Page 18)
MALFUNCTION		•	No 5VDC? Replace control panel.
500R, 500U		•	Check for 6VDC or more between pins 5 and 6 of 6PA while issuing
			a resistance command.
		• No 6VDC or more? Replace control panel.
				--------
	Defective Cables	• Perform continuity check on upper section and lower section cables.
		•	Replace broken cables.
				--------
	Defective ECB	• If cables test OK and voltage is correct on 5 &6 pins – replace ECB
	Control Board
			board
		• If ECB does not fix- connect 6PA and 6PB.
				--------
	Optical Sensor	• Check DC volts between pins 2 and 3. Rotate blades of the motor
			shaft, voltage should shift from 0 VDC and 5VDC. If voltage does
	DC Motor		not shift- replace EC B Board
		• Check for 6 VDC or more between pins 5&6 on 6 pin PBA @ ECB
			board connection. If >6 VDC exists but motor doesn’t rotate, replace
			motor.
				--------
	ECB Limit Switch	• Check continuity between pins 2 and 4 of 6PB. Press lower limit
			switch.
		• If no continuity shift- replace ECB limit switch assembly.
			---------
	Loud Continuous	•	The loud continuous tone is a safety feature designed to protect the
	Tone from lower		ECB motor. If the motor binds and cannot move the ECB board will
	board (ECB board)		divert the power from the motor to a speaker that emits this tone. If
			you have the continuous tone check to see if the motor is bound.
			Check the front pivot point	for the magnet bar and loosen the
			bolt to allow for the motor to freely move the magnet bar.

Note: If motor has been bound and then freed the motor may have been weakened. If components now move freely but the motor is laboring – replace the motor.

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