C. If the test gives the status maintenance message SDCU and the maintenance message SMOKE DET LOOP:
 - make sure that all electrical connectors are connected to the smoke detectors.
 (1) If the fault continues:
 - do a read-out of the TROUBLE SHOOTING DATA (TSD).
 The TSD shows the total number of smoke detectors (SD) installed on
 the smoke detection loop, e.g. xxxx xxxx xxxx xxxx A/B. The cabin
 layout specifies the number of SDs. If no fault is detected A=B.

 NOTE : A is the number of SDs counted clockwise from the SDCU Channel
____

 1.
 B is the number of SDs counted counterclockwise from the SDCU
 Channel 2.

 All cargo and lavatory smoke detectors are connected in a single loop, with a specified sequence. The FINs of the lavatory smoke detectors depend on the location of the lavatory in the cabin. You can ignore the FINs of smoke detectors not installed on A/C.
 Sequence of Smoke Detectors in Single-Loop Configuration (A319/320)

 -----------Lavatory Location Designation
 |SDCU | A C B T W H K D E F G
 |CHANNEL1 |--1WQ--3WQ--2WQ--20WQ--23WQ--8WQ--9WQ--4WQ--5WQ--6WQ--7WQ--|
 | | |
 | | |
 | | |
 |CHANNEL2 |--1WH--2WH--3WH--4WH--5WH--6WH-----------------------------|
 | |
 -----------
Sequence of Smoke Detectors in Single-Loop Configuration (A321)
 -----------Lavatory Location Designation |SDCU | A C B H K S T L M D E |CHANNEL1 |--1WQ--3WQ--2WQ--8WQ--9WQ--19WQ--20WQ--14WQ--15WQ--4WQ--5WQ----|
 |  |  |
 |  |  |
 |  |  G  F  |

 |CHANNEL2 |--1WH--2WH--3WH--4WH--5WH--6WH--7WH--8WH--9WH--10WH--7WQ--6WQ--|
 | |
 -----------
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-105, 151-199, ∞∞26-17-00∞∞∞∞∞∞∞∞∞∞Page 204
 201-299, May 01/05 CES

 (a) If the TSD gives the complementary information xxxx xxxx xxxx xxxx A/b (b<A)

 - replace the SD(b) (Ref. AMM TASK 26-17-15-000-001) (Ref. AMM TASK 26-17-15-400-001) counted counterclockwise from the SDCU Channel 2.

 (b) If the TSD gives the complementary information xxxx xxxx xxxx xxxx a/B (a<B)

 1_ If the fault continues:
 replace the SD(b+1) counted counterclockwise from SDCU Channel
 2 until the TSD gives the information xxxx xxxx xxxx xxxx A/B
 (A=B).

 - replace the SD(a) (Ref. AMM TASK 26-17-15-000-001) (Ref. AMM TASK 26-17-15-400-001) counted clockwise from the SDCU Channel
 1.

 1 If the fault continues:
_ replace the SD(a+1) counted clockwise from SDCU Channel 1 until the TSD gives the information xxxx xxxx xxxx xxxx A/B (A=B).
 (2) If the fault continues:
 - do a check and repair the wiring between the related smoke detectors acquired by channel 1 and channel 2 smoke detector connector A/F and the smoke detector connector A/A, smoke detector connector A/G and the smoke detector connector A/B (Ref. ASM 26-17/02) or (Ref. ASM 26-16/02).
 D. Do the test given in para. 3.
 5. Close-up
________
 A. Put the aircraft back to its initial configuration.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-105, 151-199, ∞∞26-17-00∞∞∞∞∞∞∞∞∞∞Page 205
 201-299, May 01/05 CES

 SDCU Double Channel Fault
 1. Possible Causes
_______________
 - lavatory smoke detectors

 - cargo smoke detectors

 - wiring

 2. Job Set-up Information
______________________

 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 26-16-15-000-001 AMM 26-16-15-400-001 AMM 26-17-15-000-001 AMM 26-17-15-400-001 AMM 31-32-00-860-005 ASM 26-17/01 ASM 26-17/02 ASM 26-17/03 TSM 26-17-00-810-806 26-17-00-991-001  Removal of the Cargo Smoke DetectorsInstallation of the Cargo Smoke DetectorsRemoval of the Lavatory Smoke Detector 1WQInstallation of the Lavatory Smoke Detector 1WQProcedure to Get Access to the SYSTEM REPORT/TEST FIRE PROT PagePin Programming Configuration FaultFig. 201
 3. Fault Confirmation__________________ 
R 
R  A. Test 

R  (1) - Open the circuit breakers 11WQ and 12WQ 
　
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