2. Door Warning System Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
A. Door warning light and master caution lights do not illuminate when door is open Door warning module faulty Airplane wiring is faulty Door warning sensor or microswitch faulty Door warning sensor printed circuit board in M278 miscellaneous switching module faulty On E3-2 electrical shelf check for continuity between applicable pin and ground. See table for proper connector and pin. IF --(1) Continuity present, check for continuity at applicable pin of door warning module connector and ground. See table for proper connector and pin. IF --(a) Continuity ok (b) No continuity wiring (2) Open circuit is present, test applicable sensor or microswitch. See 52-71-0, Door Warning Sensor Test for sensor test or check continuity of microswitch. IF --(a) Faulty sensor or microswitch (b) Sensor or microswitch not faulty Replace door warning module Repair airplane Readjust or replace sensors or microswitches Replace applicable printed circuit board or repair wiring. See table for applicable printed circuit board
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
B. Master caution lights illuminate when door is closed C. Master caution lights will not illuminate when door is open D. Door warning light and master caution lights will not extinguish when door is closed Master caution circuits faulty Door warning module printed circuit board faulty Door warning module printed circuit board or wiring faulty Master caution circuits faulty Check for open circuit between pin 2 of D4212P and ground. IF --(1) Open circuit present, master caution circuits faulty (2) No open circuit Check for continuity between pin 2 of D4212P and ground. IF --(1) No continuity (2) Continuity ok On E3-2 electrical shelf check for open circuit between applicable pin and ground. See table for proper connector and pin. IF -- Trouble shoot master caution circuits. See 33-15-0, Master Warning and Caution Lights Replace door warning module printed circuit board Replace printed circuit board or repair wiring Trouble shoot master caution circuits. See 33-15-0, Master Warning and Caution Lights
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
D. Door warning light and master caution lights will not extinguish when door is closed (Cont) E. Master caution lights do not extinguish when master caution reset is depressed Door warning module faulty Airplane wiring is faulty Door Warning Sensor or Microswitch faulty Door Warning Sensor printed circuit board faulty Door warning module or printed circuit board faulty Master caution circuits faulty (1) Open circuit is present, check for continuity at applicable pin of door warning module connector per table. IF --(a) No continuity (b) Continuity ok (2) No open circuit, test sensor or microswitch. See table for proper sensor or microswitch. See 52-71-0, Door Warning Sensor Test for checking sensors. Check continuity of microswitches. IF -- (a) Sensor or microswitch faulty (b) Sensors ok, applicable printed circuit is faulty Remove door warning module. IF --(1) Master caution lights extinguish (2) Lights remain illuminated Replace door warning module Repair airplane wiring Adjust or replace sensors or microswitches Replace applicable printed circuit board Replace printed circuit board or module Trouble shoot master caution circuits. See 33-15-0, Master and Warning and Caution Lights.
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
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