(h)  
If the resistances measured are in the limits shown in table 5, replace the wiring harness of the control parameter (AMM 73-21-06/401).

 (i)  
If the resistances are not in the limits shown in table 5,
 replace the MEC (AMM 73-21-01/401).

 (j)  
Set PMC SRT switches 1, 2, 3, and 4 to position 0.

 (k)  
Remove the MEC test cable from the MEC connector and from the PMC SRT MEC connector.

 (l)  
Reconnect the engine wiring harness to the MEC connector.

 (m)  
Make sure the failure is corrected. Do PLA Transducer
 Resistance test again.

 S 765-078-C00
 (3)  Torque Motor (TM) - Winding Resistance Test
 (a)  
Set PMC SRT switches 1, 2, 3, and 4 to position 0.

 (b)  
Make sure the Main Engine Test Cable is fully connected.

 (c)  
Make sure the multimeter is in the limits for each position of the PMC SRT switch 2 (TM) (table 6).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 73-21-00
 ALL  ú ú C02 Page 532 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
~............................................................ | TABLE 6 | | TM WINDING RESISTANCE TEST | .............................................................. | SWITCH 2 | | | | (TM) | | | | POSITION | TEST LIMITS | TEST POINT REFERENCE | .............................................................. | 1 |10M ohms minimum |P3-21 to cable shield J3-20 | .............................................................. | 2 |10M ohms minimum |P3-21 to ground | .............................................................. | 3 |10M ohms minimum |P3-22 to cable shield P3-20 | .............................................................. | 4 |10M ohms minimum |P3-22 to ground | .............................................................. | 5 |10M ohms minimum |P3-22 to P3-23 | .............................................................. | 6 |Less than 2 ohms |P3-21 to P3-9 | .............................................................. | 7 |Less than 2 ohms |P3-22 to P3-10 | .............................................................. | 8 |15 - 25 ohms |P3-21 to P3-22 | .............................................................. | 9 |15 - 25 ohms |P3-21 to P3-10 | .............................................................. | 10 |15 - 25 ohms |P3-9 to P3-10 | .............................................................. | 11 |15 - 25 ohms |P3-22 to P3-9 | 2..........…...................….............................1
 (d)  
If one or more test points are not in the limits shown in table 6, then continue with the instructions in test paragraph below to remove the engine wiring harness from the MEC connector.

 (e)  
If all test points pass in the limits shown in table 6, this test is complete. 1) Set PMC SRT switches 1, 2, 3, and 4 to position 0. 2) Continue the test. Go to N2 Control Alternator Resistance

 Test.

 (f)  
Remove the engine wiring harness (blue cable) from the MEC connector.

 NOTE: The MEC connector is the PLA position connector on the
____
 aft lower side of the MEC.

 (g)  
Connect the MEC test cable connector labeled PMC SRT MEC to the PMC SRT MEC connector.

 (h)  
Connect the MEC test cable connector labeled CFM56 MEC to the MEC connector.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 73-21-00
 ALL  ú ú C02 Page 533 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(i)  
Make sure the multimeter indication is in the limits for each position of the PMC SRT switch 2 (MEC) (table 7).

 ~............................................................ | TABLE 7 | | TM WINDING RESISTANCE TEST | .............................................................. | SWITCH 2 | | | | (MEC) | | | | POSITION | TEST LIMITS | TEST POINT REFERENCE | .............................................................. | 12 |10M ohms minimum |TM pin 2 to TM case | .............................................................. | 13 |10M ohms minimum |TM pin 7 to TM case | .............................................................. | 14 |10M ohms minimum |TM pin 8 to TM case | .............................................................. | 15 |10M ohms minimum |TM pin 2 to TM pin 7 | .............................................................. | 16 |Less than 2 ohms |TM pin 7 to TM pin 9 | .............................................................. | 17 |Less than 2 ohms |TM pin 8 to TM pin 10 | .............................................................. | 18 |15 - 25 ohms |TM pin 7 to TM pin 8 | .............................................................. | 19 |15 - 25 ohms |TM pin 7 to TM pin 10 | .............................................................. | 20 |15 - 25 ohms |TM pin 9 to TM pin 10 | .............................................................. | 21 |15 - 25 ohms |TM pin 8 to TM pin 9 | 2..........…...................….............................1
　
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