TM 1–1520–238–T–3
Change 5
28–3
28–7 SIGNAL NAME:
ZEROIZE IN PROGRESS
MEMORY LOCATION: 002523
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
ZEROIZE selected on CDU.
SIGNAL FUNCTION:
Indicates zeroing of DTC in progress.
REMARKS: From DTU to FCC.
PASS:
If the second digit on the CDU is 1, go to paragraph 28–8.
FAIL: Location of fault: CDU, wiring from CDU to zeroize relay, zeroize relay, wiring from zeroize relay
to DTR, DTR. Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
28–8 SIGNAL NAME:
ZEROIZE SUCCESFUL
MEMORY LOCATION: 002523
MEMORY DATA BIT(S):
15
(BINARY)
CONDITION:
ZEROIZE selected on CDU.
SIGNAL FUNCTION:
Indicates DTC is zeroized.
REMARKS: From DTU to FCC.
PASS:
If the second digit on the CDU is 2, replace DTC (TM 11–1520–238–23–1).
FAIL: Location of fault: Replace DTR (TM 11–1520–238–23–1).
28–9 SIGNAL NAME:
TERMINAL FLAG
MEMORY LOCATION: 002525
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates terminal fault.
REMARKS: From DTU to FCC.
PASS:
If first digit on CDU is 4 or 0, go to paragraph 28–10.
FAIL: Location of fault: From DTU circuit breaker to DTR. Troubleshoot wiring to isolate fault
(TM 11–1520–238–23–2).
28–10 SIGNAL NAME:
MESSAGE ERROR
MEMORY LOCATION: 002525
MEMORY DATA BIT(S):
9
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicate a message error.
REMARKS: From DTU to FCC.
PASS:
If fourth digit on CDU is 0, go to paragraph 28–12.
FAIL: Location of fault: Replace DTR (TM 11–1520–238–23–1).
28–11 SIGNAL NAME:
SUBSYSTEM FLAG
MEMORY LOCATION: 002525
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates DTC battery low.
REMARKS: From DTU to FCC.
PASS:
If first digit on CDU is 0, go to paragraph 28–14.
FAIL: Location of fault: Replace DTC (TM 11–1520–238–23–1).
