TM  11-5820-890-20-2 2-159 2.2. TROUBLESHOOTING FLOWCHARTS. Continued Chart 43 NO RT MODULATION AT SRM FROM COMMANDER'S C 2298. (Sheet 8 of 12) NOTE: The CX 13313 and CX 13300 may be connected to either MB J3 or J4. These cables then connect to the AM 1780 connector J501. Connector J501 provides the dc power to the rest of the VIC system. CX 13313 P2 V U T S R P N M L K J H F E D C B A AM 1780 J501, J505, J506, J507 V U T S R P N M L K J H F E D C B A V U T S R P N M L K J H F E D C B A CX 13313 P1 NO YES OPEN ? 1.   SET RT TO STBY. 2.   SET AM 1780 MAIN PWR TO OFF. 3.   REMOVE CX 13300 FROM AM 1780 J501. 4.   CHECK CONTINUITY AT AM 1780 J505, J506 OR J507, PIN K TO J501, PIN U. REPLACE AM 1780. 10 SH 9 NO YES OPEN ? REPLACE CX 13313. 1.   REMOVE RT. 2.   REMOVE PSA FROM MB. 3.   REMOVE CX 13313 FROM MB J3 OR J4. 4.   REMOVE CX 13313 FROM CX 13300. 5.   CHECK CONTINUITY AT CX 13313 P1, PIN U TO P2, PIN U. 9 SH 8