71-00-50
 WITH AND WITHOUT SYNC LOCKS  ú  CONFIG  7
 ú  C01  Page 122
 ú  Jul 15/98 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 3 (BLOCK 3C)
YES FROM SHEET 3(BLOCK 11B)

NO
NO
11C MOVE THE L (R) REVERSE THRUST LEVER TO THE FULLY FOR-

WARD AND DOWN POSITION. OPEN THE CIRCUIT BREAKER
"ENG 1 SYNC LOCK" ("ENG 2 SYNCLOCK" AND "ENG 2 SYNC LOCK-
ALTN").
REMOVE THE SYNC LOCK LATCH
RELAY, R477 (R479).
CLOSE THE CIRCUIT BREAKER
"ENG 1 SYNC LOCK" ("ENG 2 SYNC
LOCK" AND "ENG 2 SYNC LOCK-
ALTN").
MOVE THE L (R) REVERSE

THRUST REVERSE LEVER TO THE

YESREVERSE IDLE POSITION.

 DO A CHECK FOR 28V DC AT
CONNECTOR D10634 (D10638)
PINS A1,B1, AND X1.
 IS THERE 28V DC AT EACH
PIN?
NO

12 DISCONNECT PLUG D3052 (D3056) FROM THE REVERSER CON-
TROL MODULE, M1173 (M1174)
(WDM 78-32-11,-21).
IS THERE 28V DC BETWEEN
PIN 2 AND GROUND?
YES
YES

13 IS THERE CONTINUITY
BETWEEN PLUG D3052 (D3056),
PIN 7, AND GROUND
(WDM 78-32-11,-21)?

NO
YES
14 DISCONNECT THE PLUG FROM

THE CONTROL STAND, CONNECTOR
D5148P (WDM 78-32-11,-21).
IS THERE CONTINUITY
BETWEEN THE RECEPTACLE, PINS 4
AND 6?
NO
NO
15 EXAMINE THE ADJUSTMENT OF

THE REVERSER ARM SWITCH, S824
(S826)(AMM 78-34-05/201).
IS THE ADJUSTMENT OK?
YES
24A EXAMINE THE CIRCUIT FROM CONNECTOR D10634 (D10638),
PIN X1, THROUGH THE AUTO-THROTTLE MICROSWITCH PACK
ASSEMBLY, M1639 (M1640), TO THE CIRCUIT BREAKER "ENG 1
SYNC LOCK" ("ENG 2 SYNC LOCK" AND "ENG 2 SYNC LOCK-ALTN") OR
FROM PIN A1 OR B1, TO THE CIRCUIT BREAKER "ENG 1 SYNC
LOCK" AND "ENG 2 SYNC LOCK-ALTN").
REPAIR THE PROBLEMS THAT YOU FIND.

24B REPLACE THE SYNC LOCK LATCH RELAY, R477 (R479).
 IF THE PROBLEM CONTINUES, EXAMINE THE CIRCUIT FROM THE SYNC LOCK LATCH RELAY, R477 (R479), TO THE SYNC LOCK, V148 OR V150 (WDM 78-32-51,-61).
REPAIR THE PROBLEMS THATYOU FIND.

25 REPAIR THE OPEN CIRCUIT FROM THE REVERSER CONTROL VALVE MODULE, M1173 (M1174), PLUG D3052 (D3056), PIN 2, TO SPLICE SM100 (SM99), IN THE P6-2 CIRCUIT BREAKER PANEL (WDM 78-32-11,-21).

26 REPLACE THE REVERSER CON-TROL VALVE MODULE, M1173 (M1174)(AMM 78-34-01/401).

27 REPAIR THE OPEN CIRCUIT FROM THE REVERSER CONTROL VALVE MODULE, M1173 (M1174), PLUG D3052 (D3056), PIN 7, TO THE REVERSER ARM SWITCH, S824 (S826), OR FROM THE ARM SWITCH TO SPLICE SM101 (SM98).

28 ADJUST THE SWITCH (AMM 78-34-05/201).

29 REPLACE THE SWITCH
(AMM 78-34-05/201).

Reverser Does Not Extend. REVERSER UNLOCKED Light Does Not Come On.
Reverse Interlock Does Not Release.
Figure 105 (Sheet 4)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIXTEEN LIGHT EAU ú

 71-00-50
 WITH AND WITHOUT SYNC LOCKS  ú  CONFIG  7
 ú  C01  Page 123
 ú  Jul 15/94 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C97115
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 3
(BLOCK 3D)

YES NO YES

4 DISCONNECT PLUG D3052
16 DISCONNECT THE PLUG FROM 30 REPAIR THE OPEN CIRCUIT
(D3056) FROM THE REVERSER CON-THE CONTROL STAND, CONNECTORFROM THE REVERSER CONTROL
TROL MODULE, M1173 (M1174) D8315 (D8313) VALVE MODULE, M1173 (M1174),
(WDM 78-32-11,-21). (WDM 78-32-11,-21). PLUG D3052 (D3056), PIN 4, TO

IS THERE 28V DC BETWEEN IS THERE CONTINUITY SPLICE SM100 (SM99), IN THE
PIN 4 AND GROUND?BETWEEN THE RECEPTACLE, PINS 4 P6-2 CIRCUIT BREAKER PANEL
AND 5 (22 AND 23)?(WDM 78-32-11,-21).

YES
NO

NO

17 EXAMINE THE ADJUSTMENT OF 31 ADJUST THE SWITCH
THE REVERSER CONTROL SWITCH, (AMM 78-34-04/201).
S828 (S829)(AMM 78-34-04/201).

IS THE ADJUSTMENT OK?
YES
32 REPLACE THE SWITCH (AMM 78-34-04/201).
NO

5 IS THERE CONTINUITY 33 REPAIR THE OPEN CIRCUIT
　
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