TM 1–1520–238–T–3
14–11
14–37 SIGNAL NAME:
SYM GEN STATUS WORD OVERVOLTAGE
MEMORY LOCATION: 001026
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates when +5 VDC is exceeded.
REMARKS: From symbol generator to 1553 bus.
PASS:
If fourth digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 14–38.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–38 SIGNAL NAME:
SYM GEN STATUS WORD TERMINAL FLAG
MEMORY LOCATION: 001060
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
FAIL indicates a failed state of bits 12 through 18.
REMARKS: From symbol generator to 1553 bus.
PASS:
If first digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 14–47.
FAIL: Location of fault: if first digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 14–39.
14–39 SIGNAL NAME:
SYM GEN STATUS WORD PROM FAIL
MEMORY LOCATION: 001060
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
FAIL indicates a failed state of 256 words of PROM contained on memory
cards A5 and A12.
REMARKS: From symbol generator to 1553 bus.
PASS:
If first digit displayed on HOD is 0, 1, 4, or 5, go to paragraph 14–40.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–40 SIGNAL NAME:
SYM GEN STATUS WORD PROCESSOR FAIL
MEMORY LOCATION: 001060
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
FAIL indicates a failed state of processor card A11.
REMARKS: From symbol generator to 1553 bus.
PASS:
If first digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 14–41.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–41 SIGNAL NAME:
SYM GEN STATUS WORD AUTO STBY
MEMORY LOCATION: 001060
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
STBY indicates symbol generator has gone into standby due to no valid
message for 0.5 seconds.
REMARKS: From symbol generator to 1553 bus.
PASS:
If second digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 14–42.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
