TM 1–1520–238–T–3
14–7
14–17 SIGNAL NAME:
SYM GEN STATUS WORD INTERNAL SYNC
MEMORY LOCATION: 000732
MEMORY DATA BIT(S):
12
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates either TADS or PNVS FLIR is not present.
REMARKS: From symbol generator to 1553 bus.
PASS:
If third digit displayed on HOD is 0, 1, 4, or 5, go to paragraph 14–18.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–18 SIGNAL NAME:
SYM GEN STATUS WORD PROCESSOR TIME OUT
MEMORY LOCATION: 000732
MEMORY DATA BIT(S):
11
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates state of time out flip–flop which is reset at beginning of each frame.
REMARKS: From symbol generator to 1553 bus.
PASS:
If third digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 14–19.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–19 SIGNAL NAME:
SYM GEN STATUS WORD OVERVOLTAGE
MEMORY LOCATION: 000732
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 14–20.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–20 SIGNAL NAME:
SYM GEN STATUS WORD TERMINAL FLAG
MEMORY LOCATION: 000774
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 14–29.
FAIL: Location of fault: if first digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 14–21.
14–21 SIGNAL NAME:
SYM GEN STATUS WORD PROM FAIL
MEMORY LOCATION: 000774
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 14–22.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
