TM 1–1520–238–T–2Change 52–31Table 2–1.Master Failure Symptom Index (cont)Failure SymptomMOCReferenceCDU CIRCUIT BREAKER (CB6) DOES NOTSTAY CLOSED (PILOT ELEC PWR PANEL:BATT/EXT PWR SWITCH SET TO EXT PWR)TM 1–1520–238–T–6CIRCUITPROTECTIONSYSTEM (DCESSENTIAL BUS 3 –CPG STATION)CDU CIRCUIT BREAKER DOES NOT STAYCLOSED (AN/ASN–137) (ADC)TM 11–1520–238–23–2DOPPLERNAVIGATIONSYSTEM (DNS)AN/ASN–137 (ADC)CDU CIRCUIT BREAKER DOES NOT STAYCLOSED (AN/ASN–137) (ADD)TM 11–1520–238–23–2DOPPLERNAVIGATIONSYSTEM (DNS)AN/ASN–137 (ADD)CDU/DNS INTERFACE NOGO (MUX SWITCH TOSEC) (ADD)TM 9–1230–476–20–2MULTIPLEXSUBSYSTEM (ADD)CDU DISPLAY DOES NOT CHANGE TO NAVTOP LEVEL POWER ON PRESENT POSITIONPAGE WITHIN 3 SECONDS (CDU: VAB NEXTTO DISPLAYED WORDS PWR OFFPRESSED)TM 11–1520–238–23–2DOPPLERNAVIGATIONSYSTEM (DNS)AN/ASN–137CDU DISPLAY DOES NOT FREEZE DATA ONSCRATCH PAD WITH CURSOR POSITIONUNDER FLASHING 5 (CDU: CLR FAB KEYPRESSED)TM 11–1520–238–23–2DOPPLERNAVIGATIONSYSTEM (DNS)AN/ASN–137CDU DISPLAY LINE 6 HAS NOT CHANGEDFROM MEMORY TO BACKUP (CDU: VABNEXT TO DISPLAYED WORD ADMINPRESSED THEN VAB NEXT TO DISPLAYEDWORD BACKUP OFF PRESSED)TM 11–1520–238–23–2DOPPLERNAVIGATIONSYSTEM (DNS)AN/ASN–137CDU DISPLAYS CDU/DNS INTERFACE NO–GOMESSAGE (CDU: FD/LS KEY PRESSED)TM 11–1520–238–23–2DOPPLERNAVIGATIONSYSTEM (DNS)AN/ASN–137CDU DISPLAYS DNS RAM ERASED FD/LSINITIAL PAGE (CDU: VAB NEXT TODISPLAYED WORDS PWR OFF PRESSED)TM 11–1520–238–23–2DOPPLERNAVIGATIONSYSTEM (DNS)AN/ASN–137
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