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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Tread lights fail to illuminate with tread light switch in AUTO position Standby actuator motor continues to run after extension with STANDBY power Lower ladder fails to unlock from upper ladder Carriage step fails to rise Carriage top step is unstable Normal stair extend limit switch defective Standby stair extend limit switch or standby airstair relay is defective Upper ladder has not extended far enough to trip lower ladder uplock trigger Lower ladder lock faulty Defective carriage step actuating mechanism Mechanism is out of adjustment Disconnect airstair connector D934 and check for continuity between pin 3 and pin 11 of plug P1. If open, switch is defective Disconnect airstair connector D934 and check continuity between pin 17 and pin Y1 of standby airstair relay. If open, relay is defective. If not open, switch is defective Upper ladder out of sequence with carriage Extend upper ladder to the unlock position. Check control rod length allows full opening of up-lock hook assembly Extend carriage until actuator arm contacts actuator. Check linkage of rod assembly Extend carriage until actuator arm contacts actuator. Check rod assemblies for proper alignment Replace switch Replace relay or replace or adjust switch. Refer to 52-61-151 Adjustment/Test Resequence airstair assembly. Refer to 52-61-100 Forward airstair manual operation Adjust control rod. Refer to 52-61-191 Adjustment/Test Adjust carriage step actuating mechanism. Refer to 52-61-131 Adjustment/Test Realign and adjust. Refer to 52-61-131 Adjustment/Test
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Airstair door does Normal airstair retract Disconnect airstair connector Replace or adjust
not close after limit switch defective D934 and check continuity switch. Refer to
airstair has between pin 9 and pin 10 on 52-61-141
retracted with the plug P1. If open, switch is Adjustment/Test
NORMAL power Normal door close limit switch defective Normal door close relay or normal door motor defective defective Disconnect connector D4668P on junction box and check for 28-volt dc at pin 8 of the plug with airstair control in retract position. If voltage is not present, switch is defective Disconnect normal door motor connector D912 and check for 28-volt dc at pin 2. If voltage is not present, relay is defective. If voltage is present, motor is defective Replace or adjust switch. Refer to 52-61-601 Adjustment/Test Replace either the relay or motor
Airstair door Normal door close limit Disconnect connector D4668P Replace either the
closes, but motor switch or door close relay on junction box and check relay or switch
continues to run defective voltage is present at pin 8 of plug with airstair control switch in normal position. If voltage is present, switch is defective. If voltage not present relay is defective
Airstair door does Standby airstair retract Disconnect airstair connector Replace or adjust
not close after limit switch defective D934 and check continuity switch. Refer to
airstair has between pin 14 and pin 15 on 52-61-141
retracted with the plug P1. If open, switch is Adjustment/Test
STANDBY power defective
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Airstair door does not close after airstair has retracted with STANDBY power (cont.) Airstair door closes but standby motor continues to run Standby door close limit switch defective Standby door close relay or standby door motor defective Standby door close limit switch or door close relay defective Disconnect connector D4668P on junction box and check for 28-volt dc at pin 7 on D4668P with the airstair control switch in the standby retract position. If voltage is not present switch is defective Disconnect standby door motor connector D914 and check for 28-volt dc at pin 2 of plug P1. If voltage is not present, relay is defective. If voltage is present, motor is defective Disconnect connector D4668P on junction box and check that voltage is not present at pin 7 of D4668P. If voltage is present, switch is defective. If voltage not present, relay is defective Replace or adjust switch. Refer to 52-61-601 Adjustment/Test Replace either the relay or motor Replace or adjust switch. Refer to 52-61-601 Adjustment/Test
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