TM 1–1520–238–T–3
Change 4
25–3
25–4 SIGNAL NAME:
CONTRAST ADJ
MEMORY LOCATION: 001104
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while increasing CONTRAST; memory location response should increase
when CONTRAST is increased and decrease when CONTRAST is decreased.
SIGNAL FUNCTION:
Adjusts IHADSS contrast.
REMARKS: From pilot FCP through LH FAB MRTU Type I to FCC.
PASS:
If CONDITION has been met, go to Chapter 7, paragraph 7–33.
FAIL: Location of fault: pilot FCP, wiring from pilot FCP to LH FAB MRTU Type I, LH FAB MRTU Type
I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
25–5 SIGNAL NAME:
ACM SW
MEMORY LOCATION: 001117
MEMORY DATA BIT(S):
9
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Selects optimum gain and level of night vision sensors.
REMARKS: From pilot FCP through LH FAB MRTU Type I to FCC.
PASS:
If fourth digit displayed on HOD is 0, 1, 4, or 5, go to Chapter 10, paragraph 10–25.
FAIL: Location of fault: pilot FCP, wiring from pilot FCP to LH FAB MRTU Type I, LH FAB MRTU Type
I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
25–6 SIGNAL NAME:
IHADSS BRSIT SW (ACY) PLT IHAD BST SW1 (ACZ)
MEMORY LOCATION: 001117
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Enables IHADSS boresighting.
REMARKS: From pilot FCP through LH FAB MRTU Type I to FCC.
PASS:
If fourth digit displayed on HOD is 1, 3, 5, or 7, go to Chapter 7, paragraph 7–36.
FAIL: Location of fault: pilot FCP, wiring from pilot FCP to LH FAB MRTU Type I, LH FAB MRTU Type
I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
25–7 SIGNAL NAME:
PLT/CPG VIDEO SW (ACY) PLT VIDEO SEL SW (ACZ)
MEMORY LOCATION: 001120
MEMORY DATA BIT(S):
8
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Selects pilot or CPG video.
REMARKS: From pilot FCP through LH FAB MRTU Type I to FCC.
PASS:
If second digit displayed on HOD is 4, 5, 6, or 7, go to Chapter 7, paragraph 7–44.
FAIL: Location of fault: pilot FCP, wiring from pilot FCP to LH FAB MRTU Type I, LH FAB MRTU Type
I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
25–8 SIGNAL NAME:
PLT GRAY SCALE SW
MEMORY LOCATION: 001120
MEMORY DATA BIT(S):
9
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Selects gray scale for helmet mounted display (HMD) calibration.
REMARKS: From pilot FCP through LH FAB MRTU Type I to FCC.
PASS:
If fourth digit displayed on HOD is 0, 1, 4, or 5, go to Chapter 15, paragraph 15–63.
FAIL: Location of fault: pilot FCP, wiring from pilot FCP to LH FAB MRTU Type I, LH FAB MRTU Type
I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
