Diagnosticchart - Craftsman 139.53906D Owner's Manual

DiagnosticChart
i
issue. Consu/tDiagnostic Chartbe/ow.
Safety reversingsensors
wire open(broken or
disconnected)•
OR
Safety reversingsensorswire
shorted or black/whitewire
reversed•
Door controlor wire
shorted•
Safety reversingsensors
slightly misaligned
(dim or flashing LED).
Possible RPM sensorfailure•
Unplugto reset•
• Symptom:One or both of the Indicator fights on the safety reversingsensorsdo not
g/ow 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.
• Removesensors from brackets and shorten sensor wires to 1-2 ft (30-60 cm) from back
each of 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, replace the safety reversing sensors.
•.• Symptom:LEDis not lit on door contro/.
• 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, replacedoor
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, replace door
control wires.
"0
Symptom:Sendingindicator fight g/ows steadi/y, receivingindicator fight 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.
Symptom:RPM Sensor= Shorttrave/ 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.
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