TM  11-5820-890-20-2 2-5 2.1. OPERATIONAL CHECK. Continued STEP 4.    VAA REMOTE DC POWER CHECK:  Continued STEPS TO PERFORM CHECKS TO MAKE ACTIONS TO TAKE 4.11  Set AM 1780  MAIN PWR to INT ONLY N/A Go to Step 4.12 4.12  Set RT-A LS 671  CB1 to ON RT A LS 671 CB1 trips? NO: Go to Step 4.13 YES:    Replace LS 671 4.13  Set RT-A  FCTN to LD and back to SQ ON RT-A display lights? YES:    Continue NO: Go to TS Chart 15 RT-A LS 671 DS1 lit? YES:    Go to Step 4.14 NO: Go to TS Chart 16 4.14  Set RT-A LS-671 CB1 to OFF. Set RT-B LS-671 CB1 to ON. RT B LS 671 CB1 trips? NO: Go to Step 4.15 YES:    Replace LS 671 4.15  Set RT-A  FCTN to LD and back to SQ ON RT-A display lights? YES:    Continue NO: Go to TS Chart 19 RT-B LS 671 DS1 lit? YES:    Go to STEP 6 NO: Go to TS Chart 16 STEP 5.    SRM REMOTE DC POWER CHECK: STEPS TO PERFORM CHECKS TO MAKE ACTIONS TO TAKE 5.1 Set PSA CB1 to ON PSA DS1 lights? NO: Go to Step 5.2 YES:    Go to TS Chart 20 5.2 Set AM 1780  MAIN PWR to NORM PSA CB1 trips? NO: Continue YES:    Go to TS Chart 21 PSA DS1 lights? YES:    Continue NO: Go to TS Chart 22 AM 1780 DS501 lights? YES:    Go to STEP 7 NO: Go to TS Chart 23