TM  11-5820-890-20-2 2-93 2.2. TROUBLESHOOTING FLOWCHARTS. Continued Chart 27 NO RT-A MODULATION FROM COMMANDER'S C 2298. (Sheet 9 of 14) V U T S R P N M L K J H F E D C B A AM 1780 J501, J505, J506, J507 NO YES OPEN ? REPLACE AM 1780. 1.   REMOVE RTs. 2.   REMOVE VAA FROM MB. 3.   REMOVE CX 13313 FROM MB  J3. 4.   REMOVE CX 13313 FROM CX 13300. 5.   CHECK CONTINUITY AT CX 13313 P1, PIN U TO P2, PIN U. 1.   SET RTs TO STBY. 2.   SET VAA  CB1 TO OFF. 3.   SET AM 1780 CB501 TO OFF. 4.   REMOVE CX 13300 FROM AM 1780 J501. 5.   CHECK CONTINUITY AT AM 1780 J505, J506, OR J507, PIN K TO J501, PIN U. V U T S R P N M L K J H F E D C B A CX 13313 P2 V U T S R P N M L K J H F E D C B A MB J3 CX 13313 P1 NO YES OPEN ? REPLACE CX 13313. 11 SH 10 9 SH 9