TM 1–1520–238–T–3
30–4
Change 5
30–10 SIGNAL NAME:
SUBSYSTEM FLAG
MEMORY LOCATION: 003036
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates subsystem fault.
REMARKS: From SDCC to FCC.
PASS:
If first digit displayed on CDU is 0 or 1, go to paragraph 30–11.
FAIL: Location of fault: replace SDCC (TM 11–1520–238–23–1).
30–11 SIGNAL NAME:
TERMINAL FLAG
MEMORY LOCATION: 003036
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates terminal fault.
REMARKS: From SDCC to FCC.
PASS:
If first digit displayed on CDU is 0, go to paragraph 30–12.
FAIL: Location of fault: replace SDCC (TM 11–1520–238–23–1).
30–12 SIGNAL NAME:
TEST STATUS CODE
MEMORY LOCATION: 003037
MEMORY DATA BIT(S):
4–5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors DNS test status.
REMARKS: From SDCC to FCC.
PASS:
If fifth and sixth digits displayed on CDU are 0=no test in progress.
If fifth digit is 4 and sixth digit is 0=DNS test in progress.
If fifth digit is 0 and sixth digit is 1=test complete.
For failure code after test, go to paragraph 30–13.
FAIL: Location of fault: if condition does not agree with test status, replace SDCC
(TM 11–1520–238–23–1).
30–13 SIGNAL NAME:
FAILURE CODE
MEMORY LOCATION: 003040
MEMORY DATA BIT(S):
5–11; 13–19
(ASCII)
CONDITION:
Refer to table 30–1 for ASCII code conversions.
SIGNAL FUNCTION:
Indicates DNS failure codes after test.
REMARKS: From SDCC to FCC.
PASS:
Valid combinations of ASCII code conversions are as follows:
GO=DNS is operational. Go to paragraph 30–15.
FAIL: BU=System should be switched to back–up mode.
MN=Only manual operation is possible.
NG=DNS is not operational.
For failure code, go to paragraph 30–14.
