TM 1–1520–238–T–3
7–6
7–17 SIGNAL NAME:
CPG IHADSS MODE CMD
MEMORY LOCATION: 001636
MEMORY DATA BIT(S):
17–19
(OCTAL)
CONDITION:
If first digit displayed on HOD is 0=FILT A
If first digit displayed on HOD is 1=FILT B
If first digit displayed on HOD is 2=FILT C
If first digit displayed on HOD is 3=BRSIT
If first digit displayed on HOD is 4=BRSIT STORE
If first digit displayed on HOD is 5=TEST
If first digit displayed on HOD is 6=DIAGNOSTICS
SIGNAL FUNCTION:
Monitors CPG IHADSS mode.
REMARKS: From SEU through RH FAB MRTU Type I to FCC.
PASS:
If CONDITION corresponds to observed system status, go to paragraph 7–18.
FAIL: Location of fault: SEU, wiring from SEU to RH FAB MRTU Type I, RH FAB MRTU Type I,
IHADSS circuit breaker, wiring from IHADSS circuit breaker to DEU, DEU. Troubleshoot wiring
to isolate fault (TM 9–1270–221–23).
7–18 SIGNAL NAME:
IHADSS TEST WORD CMD
MEMORY LOCATION: 001635
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
125252 displayed on HOD
SIGNAL FUNCTION:
IHADSS wraparound test command.
REMARKS: From SEU through RH FAB MRTU Type I to FCC.
PASS:
Location of fault if condition is met: wiring between pilot SEU and IHU, wiring between CPG
SEU and IHU. Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
FAIL: Location of fault: SEU, wiring from SEU to RH FAB MRTU Type I, RH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–19 SIGNAL NAME:
DEU STATUS
MEMORY LOCATION: 001530
MEMORY DATA BIT(S):
6
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors display electronics unit (DEU) status.
REMARKS: From DEU through RH FAB MRTU Type I to FCC.
PASS:
Location of fault if fifth digit on HOD is 2, 3, 6, or 7: wiring between pilot DAP and DEU, wiring
between CPG DAP and DEU. Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
FAIL: Location of fault: go to paragraph 7–20.
7–20 SIGNAL NAME:
CPG DEU TEST CMD
MEMORY LOCATION: 001626
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors DEU test CMD.
REMARKS: From DEU through RH FAB MRTU Type I to FCC.
PASS:
If fifth digit on HOD is 4, 5, 6, or 7, go to paragraph 7–21.
FAIL: Location of fault: MISSION IHADSS circuit breaker, wiring from MISSION IHADSS circuit
breaker to DEU, DEU, wiring from DEU to RH FAB MRTU Type I, RH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
