TM  11-5820-890-20-2 2-3 2.1. OPERATIONAL CHECK. Continued STEP 3.    INTERCOM CHECK: STEPS TO PERFORM CHECKS TO MAKE ACTIONS TO TAKE 3.1 At each control box, in turn MONITOR to ALL MONITOR to A MONITOR to INT ONLY MONITOR to C N/A N/A N/A N/A N/A N/A N/A N/A 3.2 Press HS PTT and count into HS at each MONITOR switch setting AM 1780 relays click and sidetone heard? YES:    Go to Step 3.3 NO: Continue At any position: AM 1780 relays do not click and sidetone not heard? NO: Continue YES:    Go to TS Chart 5 At any position: AM 1780 relays do not click and sidetone is heard? NO: Continue YES:    Go to TS Chart 6 At every position: AM 1780 relays click and sidetone not heard? NO: Continue YES:    Go to TS Chart 7 At a particular position: AM 1780 relays click and sidetone not heard? NO: Go to Step 3.3 YES:    Go to TS Chart 8 3.3 Set commander's C 2298  MONITOR to C. Connect HS to J803 Press HS PTT and count into HS N/A N/A Sidetone heard? N/A N/A YES:    Go to Step 3.4 NO: Go to TS Chart 9 3.4 Set all C 2298  MONITOR to INT ONLY. Move HS to J802 N/A N/A N/A Go to Step 3.5 3.5 Set C 2297  MONITOR to INT ONLY. Move HS to J902 N/A N/A N/A Go to Step 3.6 3.6 At each control box, press PTT and count into HS Sidetone heard? YES:    Go to STEP 4 NO: Replace Control Box