TM 1–1520–238–T–3
14–6
14–12 SIGNAL NAME:
SYM GEN STATUS WORD PROM FAIL
MEMORY LOCATION: 000732
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 14–13.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–13 SIGNAL NAME:
SYM GEN STATUS WORD PROCESSOR FAIL
MEMORY LOCATION: 000732
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 14–14.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–14 SIGNAL NAME:
SYM GEN STATUS WORD AUTO STBY
MEMORY LOCATION: 000732
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 14–15.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–15 SIGNAL NAME:
SYM GEN STATUS WORD RAM FAIL
MEMORY LOCATION: 000732
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 14–16.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
14–16 SIGNAL NAME:
SYM GEN STATUS WORD RAM FAIL
MEMORY LOCATION: 000732
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 14–17.
FAIL: Location of fault: replace symbol generator (TM 11–1520–238–23–2).
