TM 1–1520–238–T–3
15–12
Change 4
15–39 SIGNAL NAME:
LT STATUS (ACY) LST CMD (ACZ)
MEMORY LOCATION: 001136
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates FD/LS laser tracker (LT) failure.
REMARKS: From TEU through LH FAB MRTU Type I to FCC.
PASS:
If fourth digit on HOD is 1, 3, 5, or 7, go to paragraph 15–40.
FAIL: Location of fault: replace laser tracker receiver unit (LTRU) (TM 1–1270–476–20).
15–40 SIGNAL NAME:
TV STATUS
MEMORY LOCATION: 001136
MEMORY DATA BIT(S):
7
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates FD/LS day television (TV) video failure.
REMARKS: From TEU through LH FAB MRTU Type I to FCC.
PASS:
If fifth digit on HOD is 1, 3, 5, or 7, go to paragraph 15–41.
FAIL: Location of fault: replace day TV (DTV) (TM 1–1270–476–20).
15–41 SIGNAL NAME:
FLIR STATUS
MEMORY LOCATION: 001136
MEMORY DATA BIT(S):
8
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates FD/LS night sensor video failure.
REMARKS: From TEU through LH FAB MRTU Type I to FCC.
PASS:
If fourth digit on HOD is 4, 5, 6, or 7, go to paragraph 15–131.
FAIL: Location of fault: replace night vision sensor (NVS) (TM 1–1270–476–20).
15–42 SIGNAL NAME:
TADS IAT STATUS
MEMORY LOCATION: 001136
MEMORY DATA BIT(S):
12
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates FD/LS TADS image autotrack (IAT) subsystem failure.
REMARKS: From TEU through LH FAB MRTU Type I to FCC.
PASS:
If third digit on HOD is 2, 3, 6, or 7, go to paragraph 15–134.
FAIL: Location of fault: replace TEU (TM 1–1270–476–20).
15–43 SIGNAL NAME:
IHADSS SELECT (ACY) HMD BRT/CTRS SEL (ACZ)
MEMORY LOCATION: 000561
MEMORY DATA BIT(S):
4
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Adjusts integrated helmet and display sight system (IHADSS) bright and
contrast controls that are being used to control IHADSS.
REMARKS: From FCC through CPG MRTU Type III to optical relay tube (ORT).
PASS:
If sixth digit on HOD is 0, go to paragraph 15–44.
FAIL: Location of fault: CPG MRTU Type III, wiring from CPG MRTU Type III to ORT, ORT.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
