TM 1–1520–238–T–3
14–12
14–42 SIGNAL NAME:
SYM GEN STATUS WORD RAM FAIL
MEMORY LOCATION: 001060
MEMORY DATA BIT(S):
15
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates RAM status on A2, A3, and A4 cards.
REMARKS: From symbol generator to 1553 bus.
PASS:
If fifth digit displayed on HOD is 0, 1, 4, or 5, go to paragraph 14–43.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–43 SIGNAL NAME:
SYM GEN STATUS WORD RAM FAIL
MEMORY LOCATION: 001060
MEMORY DATA BIT(S):
14
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates RAM status on A12 card.
REMARKS: From symbol generator to 1553 bus.
PASS:
If second digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 14–44.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–44 SIGNAL NAME:
SYM GEN STATUS WORD INTERNAL SYNC
MEMORY LOCATION: 001060
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 14–45.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–45 SIGNAL NAME:
SYM GEN STATUS WORD PROCESSOR TIME OUT
MEMORY LOCATION: 001060
MEMORY DATA BIT(S):
11
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates state of the time out flip–flop which is reset at the 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 14–46.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–46 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 14–47.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
