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Note: If motor has been bound and then
freed the motor may have been weakened. If
components now move freely but the motor
is laborin
g
–
re
p
lace the motor.
Symptom Probable Cause Corrective Action
ECB
MALFUNCTION
500R, 500U
Control Panel
Defective Cables
Defective ECB
Control Board
Optical Sensor
DC Motor
ECB Limit Switch
Loud Continuous
Tone from lower
board (ECB board)
•
Power on unit. Check for 5VDC between pins 1 and 2. (Page 18)
• No 5VDC? Replace control panel.
• Check for 6VDC or more between pins 5 and 6 of 6PA while issuing
a resistance command.
• No 6VDC or more? Replace control panel.
--------
• Perform continuity check on upper section and lower section cables.
• Replace broken cables.
--------
• If cables test OK and voltage is correct on 5 &6 pins – replace ECB
board
• If ECB does not fix- connect 6PA and 6PB.
--------
• 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
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.
--------
• Check continuity between pins 2 and 4 of 6PB. Press lower limit
switch.
• If no continuity shift- replace ECB limit switch assembly.
---------
• The loud continuous tone is a safety feature designed to protect the
ECB motor. If the motor binds and cannot move the ECB board will
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.
Support Services 800-883-8783 Mon-Fri 8:30am-5:00pm Central Time Zone Fax: 636-272-7148
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