TM  11-5820-890-20-2 4-4 4.1. OPERATIONAL CHECK. Continued STEP 5.    TRANSMIT/RECEIVE CHECKS: STEPS TO PERFORM CHECKS TO MAKE ACTIONS TO TAKE 5.1 Set RCU:   FCTN to ICM COMSEC to PT N/A N/A N/A N/A 5.2 RCU: Press CALL and PTT, and release RCU display reads CALL? YES:    Go to Step 5.3 NO: Go to TS Chart 3 5.3 RCU: Press PTT and count into HS Voice heard at RT? YES:    Go to Step 5.4 NO: Go to TS Chart 4 5.4 RT: Press CALL and PTT, and release RT display reads CALL? YES:    Go to Step 5.5 NO: Go to TS Chart 5 5.5 RT: Press PTT and count into HS Voice heard at RCU? YES:    Go to Step 5.6 NO: Go to TS Chart 6 5.6 RCU: Press CALL and PTT, and release RCU display reads CALL? YES:    Go to Step 5.3 NO: Go to TS Chart 3 5.7 Set RCU  FCTN to LD LS 685: Connect to RCU, and turn speaker ON N/A Rushing noise heard? N/A YES:    End of Dismounted RCU Operational Check NO: Go to TS Chart 7 STEP 6.    VEHICULAR POWER CHECK: STEPS TO PERFORM CHECKS TO MAKE ACTIONS TO TAKE 6.1 Set RCU: FCTN to OFF CHAN to MAN MODE to SC RF PWR to HI VOL to Mid Range DIM to Full CW COMSEC to CT SPEAKER to OFF N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.2 VAA/ PSA  CB1 to ON DS1 lights? * YES:    Go to Step 6.3 NO: Troubleshoot Power to VAA/PSA 6.3 Set RCU  FCTN to SQ ON RCU display lights? YES:    End of RCU Vehicular Power Check NO: Go to TS Chart 8 * Continously flashing, DS1 indicates a problem, replace VAA.