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J
Safety Reversing Sensor
Diagnostic Chart
Bell Wire
Safetyreversingsensors
wire open (brokenor
disconnected).
OR
Safetyreversingsensors
wire shortedor black/white
wire reversed.
Doorcontrolor
wire shorted.
Safety reversingsensors
slightly misaligned
(dim or flashingLED).
Motoroverheatedor possible
RPMsensorfailure. Unplug
to reset.
Motor CircuitFailure.
Replace Receiver
LogicBoard.
•"0 Symptom:One or both of the Indicatorfights on the safety reversingsensorsdo notglow
steady.
• Inspect sensor wires for a short (staple in wire), correct wiring polarity (black/white wires
reversed), broken or disconnectedwires, replace/attachas needed.
• Disconnect all wires from back of motor unit.
• Remove sensors from bracketsand shorten sensor wires to 1-2 ft (30-60 cm) from back of
each sensor.
• Reattachsending eye to motor unit using shortenedwires. If sending eye indicator light
glows steadily, attach the receiving eye.
• Align sensors, if the indicator lights glow replacethe wires for the sensors. If the sensor
indicator lights do not light, replacethe safety reversing sensors.
•.Q Symptom:LEDis not lit on doorcontrol.
• Inspect door control/wires for a short (staple in wire), replace as needed.
• Disconnect wires at door control, touch wires together. If motor unit activates, replace door
control.
• If motor unit does not activate, disconnect door control wires from motor unit. Momentarily
short across red and white terminals with jumper wire. If motor unit activates, replacedoor
control wires.
•.Q Symptom:Sendingindicatorlight glowssteadily, receivingindicator light is dim or flashing.
• Realign receiving eye sensor, clean lens and secure brackets.
• Verify door track is firmly securedto wall and does not move.
•"0 Symptom:Motor has overheated;the motor unit doesnot operateor trolley is stuckon stop
bolt = Motor unit humsbrief/y; RPM Sensor= Shorttravel 6-8" (15-20 cm).
• Unplug unit to reset. Try to operate motor unit, check diagnostic code.
• If it is still flashing 5 times and motor unit moves 6-8" (15-20 cm), replace RPM sensor.
• If motor unit doesn't operate, motor unit is overheated.Wait 30 minutes and retry. If motor
unit still will not operate replace logic board.
• 0 Symptom:Motor unit doesn't operate.
• Replacelogic board because motor rarely fails.
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