TM 1–1520–238–T–3
5–4
Change 4
5–7 SIGNAL NAME:
GTCB STATUS
MEMORY LOCATION: 001530
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of GTCB.
REMARKS: From GTCB through RH FAB MRTU Type I to FCC.
PASS:
If second digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 5–8.
FAIL: Location of fault: GTCB, wiring from GTCB to RH FAB MRTU Type I, RH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2).
5–8 SIGNAL NAME:
RNDS CNTR STATUS
MEMORY LOCATION: 001540
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates rounds counter status.
REMARKS: From rounds counter through RH FAB MRTU Type I to FCC.
PASS:
If the sixth digit displayed on HOD is 0, go to paragraph 5–9.
FAIL: Location of fault: AWS DC and AWS AMMO circuit breakers, wiring from AWS DC and AWS
AMMO circuit breakers to rounds counter/magazine controller, rounds counter/magazine
controller, wiring from rounds counter/magazine controller to RH FAB MRTU Type I, RH FAB
MRTU Type I. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2).
5–9 SIGNAL NAME:
GUN TRS STATUS
MEMORY LOCATION: 001530
MEMORY DATA BIT(S):
7
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates train rate sensor status.
REMARKS: From GTCB through RH FAB MRTU Type I to FCC.
PASS:
If fifth digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 5–10.
FAIL: Location of fault: Gun turret rate gyro, wiring from gun turret rate gyro to GTCB, GTCB, wiring
from GTCB to RH FAB MRTU Type I. Troubleshoot wiring to isolate fault
(TM 9–1090–208–23–2).
5–10 SIGNAL NAME:
GCB STATUS
MEMORY LOCATION: 001530
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates gun control box (GCB) status.
REMARKS: From GCB through GTCB and RH FAB MRTU Type I to FCC.
PASS:
If first digit displayed on HOD is 4, 5, 6, or 7, go to paragraph 5–11 (ACY) or 5–11A (ACZ).
FAIL: Location of fault: GCB, wiring from GCB to GTCB, wiring from GTCB to RH FAB MRTU Type I,
RH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2).
