TM 1–1520–238–T–3
Change 4
15–29
15–119 SIGNAL NAME:
LASER OVERTEMP IND (ACY) LRFD OVERTEMP IND (ACZ)
MEMORY LOCATION: 001076
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates laser cavity overheated.
REMARKS: From TADS LEU through LH FAB MRTU Type I to FCC.
PASS:
Location of fault if third digit on HOD is 1, 3, 5, or 7: troubleshoot LTU (TM 1–1270–476–T).
FAIL: Location of fault: cavity cooling box unit, wiring from LTU to LH FAB MRTU Type I, LH FAB
MRTU Type I. Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
15–120 SIGNAL NAME:
LASER LOW PWR IN (ACY) LRFD LOW PWR IND (ACZ)
MEMORY LOCATION: 001076
MEMORY DATA BIT(S):
14
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates laser peak power is less than 70 percent of nominal.
REMARKS: From TADS LEU through LH FAB MRTU Type I to FCC.
PASS:
Location of fault if second digit on HOD is 4, 5, 6, or 7: troubleshoot TPS (TM 1–1270–476–T).
FAIL: Location of fault: LEU, wiring from LEU to LH FAB MRTU Type I, LH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
15–121 SIGNAL NAME:
DVO SENSOR SEL (ACY) DVO SEL SW (ACZ)
MEMORY LOCATION: 000412
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates to TEU that CPG has selected direct view optics (DVO).
REMARKS: From ORT through CPG MRTU Type III to FCC.
PASS:
If fourth digit on HOD is 2, 4, or 6, go to paragraph 15–122.
FAIL: Location of fault: ORT LH grip, ORT, wiring from ORT to CPG MRTU Type III, CPG MRTU Type
III. Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
15–122 SIGNAL NAME:
RTCL ILL TO DVO (ACY) DVO RTCL ILL CMD (ACZ)
MEMORY LOCATION: 000552
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
Monitor HOD while increasing brightness; memory location response should increase
when brightness is increased and decrease when brightness is decreased.
SIGNAL FUNCTION:
Controls brightness of DVO reticle.
REMARKS: From FCC through CPG MRTU Type III to TADS turret. The DVO/HDD display itself does
not visibly change.
PASS:
If CONDITION is met, go to paragraph 15–123.
FAIL: Location of fault: CPG MRTU Type III, wiring from CPG MRTU Type III to TADS turret, TADS
turret. Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
