TM  11-5820-890-20-2 2-2 2.1. OPERATIONAL CHECK. Continued STEP 1.    PREPARATION:  Continued STEPS TO PERFORM CHECKS TO MAKE ACTIONS TO TAKE 1.6 Set Power Supply Adapter (PSA) (If present): CB1 to OFF DS1 to Full CCW S1 to RMT N/A N/A N/A N/A N/A N/A 1.7 Set Vehicle Master Power Switches: In accordance with vehicle instructions, turn off power to VIC/Comm equipment. N/A N/A 1.8 Set C 2297: SIG EXT OFF to OFF VOLUME to Full CW Connect HS to J903* N/A N/A Ensure HS is operational N/A N/A Install known good HS 1.9 Set all C 2298  VOLUME to Full CW Connect HS to J803 N/A Ensure HS is operational N/A Install known good HS STEP 2.    MAIN POWER CHECKS: STEPS TO PERFORM CHECKS TO MAKE ACTIONS TO TAKE 2.1 Set Vehicle Master Power Switches: In accordance with vehicle instructions, turn on power to VIC/Comm equipment. Master Power Circuit Breaker trips? NO: Continue YES:    Go to TS Chart 1 VIC/Comm power lamp (if applicable) lights? YES:    Go to Step 2.2 NO: Vehicular wiring is bad 2.2 Set AM 1780  MAIN PWR to INT ONLY AM 1780 DS501 lights? NO: Go to Step 2.3 YES:    Replace AM 1780 2.3 Set AM 1780  CB501 to ON AM 1780 CB501 trips? NO: Continue YES:    Go to TS Chart 2 AM 1780 DS501 Lights? YES:    Go to Step 2.4   NO: Go to TS Chart 3 2.4 Set C 2297  SIG EXT OFF to OFF N/A Go to STEP 3 *  Disconnect all other CVC and handset from system.