TM 1–1520–238–T–3
Change 4
7–9
7–29 SIGNAL NAME:
BRT TO PLT DAP (ACY) PLT IHAD BRT CMD (ACZ)
MEMORY LOCATION: 001606
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while adjusting pilot DAP brightness from minimum (–) to maximum (+).
SIGNAL FUNCTION:
Controls IHADSS brightness.
REMARKS: From FCC through RH FAB MRTU Type I to pilot DAP.
PASS:
If condition is met go to paragraph 7–30.
FAIL: Location of fault: RH FAB MRTU Type I, wiring from RH FAB MRTU Type I to pilot DAP, pilot
DAP. Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–30 SIGNAL NAME:
ORT SYMBOLOGY BRIGHT ADJ (ACY) CPG SYM BRT ADJ (ACZ)
MEMORY LOCATION: 000433
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor ORT symbol generator display as brightness level is adjusted from minimum
(–) to maximum (+).
SIGNAL FUNCTION:
Controls optical relay tube (ORT) symbol generator brightness.
REMARKS: From ORT through CPG MRTU Type III to FCC.
PASS:
If condition is met refer to failure symptom index and next failure symptom paragraph.
FAIL: Location of fault: ORT, wiring from ORT to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–31 SIGNAL NAME:
ORT IHADSS CONTRAST ADJ (ACY) CPG CTRS ADJ (ACZ)
MEMORY LOCATION: 000432
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor ORT IHAD display as contrast level is adjusted from minimum (–) to maximum
(+).
SIGNAL FUNCTION:
Controls IHADSS contrast.
REMARKS: From ORT through CPG MRTU Type III to FCC.
PASS:
If condition is met go to paragraph 7–32.
FAIL: Location of fault: ORT, wiring from ORT to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–32 SIGNAL NAME:
ORT IHADSS CONTRAST TO TEU (ACY) CPG CTRS ADJ TST (ACZ)
MEMORY LOCATION: 001257
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor ORT IHAD contrast signal level to TEU as level is adjusted from minimum (–)
to maximum (+).
SIGNAL FUNCTION:
Provides indication of ORT control outputs to TEU.
REMARKS: From FCC to TEU.
PASS:
If condition is met go to paragraph 7–33.
FAIL: Location of fault: LH FAB MRTU Type I, wiring from LH FAB MRTU Type I to TEU, TEU.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
