Craftsman 139.53916D Manual Del Propietário página 34

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Safety Reversing Sensor
Diagnostic Chart
Bell Wire
Safety reversingsensors
wire open (broken or
disconnected).
OR
Safety reversingsensors
wire shorted or black/white
wire reversed.
Door controlor
wire shorted.
Safety reversingsensors
slightly misaligned
(dim or flashingLED).
Motor overheatedor possible
RPM sensorfailure. Unplug
to reset.
Motor CircuitFailure.
Replace Receiver
Logic Board.
•"0 Symptom:One or both of the Indicator fights on the safety reversingsensorsdo not glow
steady.
• Inspect sensor wires for a short (staple in wire), correct wiring polarity (black/white wires
reversed), broken or disconnected wires, replace/attachas needed.
• Disconnect all wires from back of motor unit.
• Remove sensors from brackets and shorten sensor wires to 1-2 ft (30-60 cm) from back of
each sensor.
• Reattach sending eye to motor unit using shortened wires. 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:LED is not lit on door control.
• 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:Sendingindicator light glowssteadily, receivingindicator light is dim or flashing.
• Realign receiving eye sensor, clean lens and secure brackets.
• Verify door track is firmly secured to wall and does not move.
•"0 Symptom:Motor has overheated;the motor unit does not operateor trolley is stuckon stop
bolt = Motor unit hums brief/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.
• Replace logic board because motor rarely fails.
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