30-11-00
 ALL  ú ú 01 Page 7 ú Jun 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 WING THERMAL ANTI-ICING SYSTEM - TROUBLE SHOOTING
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 1.  General_______
 A.  Before using the following trouble shooting chart, prepare to test the wing TAI system in accordance with adjustment/test procedure. Proceed with test to extent practical to determine extent of trouble. When checking system for air mode of operation, press GND SENSING TEST switch on landing gear module.
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 30-11-00
 ALL  ú ú 01 Page 101 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL 
2.  Trouble Shooting Chart_____________________ 

TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
One light does press to test or in any switch Neither light One light does not agree with switch position not come on (on position) comes on (on press to test or in valve transit)  Defective lamp Defective lamp base Defective wiring Defective valve control circuit  Check continuity of lamp. IF -Continuity OK - Check for defective lamp base Check for continuity with lamp installed between base terminals 1 and 2, and 1 and 3 with light cover normal and between terminals 1 and 4 with light cover depressed. IF -Remove receptacle D462 from P5-11 module and check for dc power at pin Power OK - Check for con-tinuity between pin 29 and ground. IF -Check if valve position agrees with switch posi-tion. IF -Continuity OK -No continuity -No power -No continuity -Continuity OK -No continuity -31. IF - Replace lamp Replace lamp base Replace P5-11 module (Ref 30-11-41, R/I) Repair wiring between circuit breaker and receptacle Repair wiring between recepta-cle and ground Replace P5-11 module (Ref 30-11-41, R/I) 

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 ALL  ú ú 02 Page 102 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
One light does not agree with switch position (Cont)  Defective valve control circuit (Cont)  Valve agrees with switch tive valve position indi-cation circuit Valve does not agree with position - Check for defec-switch position - Remove receptacle D648 from P5-11 module if left valve or D462 if right valve and Power OK - Jumper pin 10 on receptacle D648 to pin 10 on P5-11 module if left valve or replace receptacle D462 if right valve and check for ac power at pins 3 and 5 of module recep-tacle D648 with switch in position. IF -Power OK - Install recep-tacle D648 on P5-11 module and remove receptacle to respective valve and check for power at pin 1 for No power -No power -check for ac power at pin 11. IF -OFF position and at pins 4 and 6 with switch in ON switch in ON position. IF - Repair wiring between circuit Replace P5-11 module (Ref 30-11-41, R/I) breaker and pin 11 of receptacle 

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 30-11-00
 ALL  ú ú 02 Page 103 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
One light does not agree with switch position (Cont) Neither light agrees with switch position  Defective valve control circuit (Cont) Defective valve control circuit  Power OK - Check for con-tinuity between pin 3 of valve receptacle and ground. IF -Disconnect receptacle D462 from P5-11 module dc power at pin 24. IF -Power OK - Check for con-tinuity between pin 21 and ground. IF -Continuity - Disconnect receptacle from both ground overheat thermal switches and check for continuity between pins 1 and 2 on each switch. IF -No continuity -No power -No continuity -Continuity OK -No power - Repair wiring Repair wiring between valve receptacle and ground Replace valve (Ref 30-11-11, R/I) Repair wiring between circuit breaker and re-ceptacle (See Landing Gear Miscellaneous Electrical Com-ponents - Chapter 32, for operation of safety relay) Replace P5-11 module (Ref 30-11-41, R/I) between recept-tacle D648 and respective valve receptacle 
　
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