TM 1–1520–238–T–3
7–2
Change 5
Personnel Required:
(2)
References:
TM 9–1230–476–20–2
TM 9–1270–221–23
TM 1–1270–476–T
Equipment Conditions:
Ref
Condition
TM 9–1270–221–23
IHADSS –
MAINTENANCE
OPERATIONAL CHECK in
progress
NOTE
All multiplex read code responses are read from right to
left.
Multiplex read codes must be used in conjunction with
applicable Maintenance Operational Check (MOC) in
progress.
Multiplex read codes are observed on the HOD (ADC) or
CDU (ADD).
MULTIPLEX READ CODE INTERPRETATIONS
7–1 SIGNAL NAME:
IHADSS PWR SWITCH
MEMORY LOCATION: 000436
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors integrated helmet and display sight system (IHADSS) POWER switch.
REMARKS: From copilot/gunner (CPG) fire control panel (FCP) through CPG multiplex remote
terminal unit (MRTU) Type III to fire control computer (FCC).
PASS:
If first digit on heads out display (HOD) is 4, 5, 6, or 7, go to paragraph 7–2.
FAIL: Location of fault: CPG FCP, wiring from CPG FCP to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
7–2 SIGNAL NAME:
IHADSS PWR SWITCH 2
MEMORY LOCATION: 000436
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors IHADSS POWER switch.
REMARKS: From CPG FCP through CPG MRTU Type III to FCC.
PASS:
If first digit on HOD is 1, 3, 5, or 7, go to paragraph 7–3.
FAIL: Location of fault: CPG FCP, wiring from CPG FCP to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
