TM  11-5820-890-20-2 2-109 2.2. TROUBLESHOOTING FLOWCHARTS. Continued Chart 30 NO RT-B MONITORING AT COMMANDER'S C 2298. MONITOR SWITCH AT C. (Sheet 3 of 4) J H P K S R N M L F E D B A C V U T MB J5 V U T S R P N M L K J H F E D C B A MB J4 NO YES SHORT TO GROUND ? REPLACE MB. CHECK CONTINUITY AT MB J4, PIN H TO J5, PIN N. NO YES 3.0 TO 8.0 V ac ? REPLACE AM 1780. 1.   REMOVE CX 13300 FROM AM 1780 J503. 2.   MEASURE AC VOLTAGE AT CX 13300, PIN H TO PIN A (GND). NO YES OPEN ? REPLACE MB. 3 SH 4 1.   REMOVE VAA FROM MB. 2.   REMOVE CX 13300 FROM MB  J4. 3.   CHECK CONTINUITY AT MB J4, PIN H TO J2, PIN A (GND). V U T S R P N M L K J H F E D C B A 2 SH 3 CX 13300 D C B A MB J2