TM 1–1520–238–T–3
14–10
14–32 SIGNAL NAME:
SYM GEN STATUS WORD AUTO STBY
MEMORY LOCATION: 001026
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 14–33.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–33 SIGNAL NAME:
SYM GEN STATUS WORD RAM FAIL
MEMORY LOCATION: 001026
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 14–34.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–34 SIGNAL NAME:
SYM GEN STATUS WORD RAM FAIL
MEMORY LOCATION: 001026
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 14–35.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–35 SIGNAL NAME:
SYM GEN STATUS WORD INTERNAL SYNC
MEMORY LOCATION: 001026
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 14–36.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–36 SIGNAL NAME:
SYM GEN STATUS WORD PROCESSOR TIME OUT
MEMORY LOCATION: 001026
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 14–37.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
