TM 1–1520–238–T–3
8–22
8–58 SIGNAL NAME:
RHE STATUS WORD CHECKSUM ERROR
MEMORY LOCATION: 001455
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of RHE PROM.
REMARKS: From FCC to RHE.
PASS:
If first digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 8–59.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–59 SIGNAL NAME:
RHE STATUS WORD SUBSYSTEM BUSY
MEMORY LOCATION: 001455
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
BUSY indicates a full 25 HZ processing frame has not been completed.
REMARKS: From FCC to RHE.
PASS:
If second digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 8–60.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–60 SIGNAL NAME:
RHE STATUS MESSAGE SEQUENCE ERROR
MEMORY LOCATION: 001455
MEMORY DATA BIT(S):
15
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates that all transmit and receive messages are not transferred within any
25 HZ processing frame.
REMARKS: From FCC to RHE.
PASS:
If second digit displayed on HOD is 0, 1, 4, or 5, go to paragraph 8–61.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–61 SIGNAL NAME:
RHE STATUS FIRE INTERLOCK
MEMORY LOCATION: 001455
MEMORY DATA BIT(S):
14
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates a fire interlock hangup is detected.
REMARKS: From FCC to RHE.
PASS:
If second digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 8–62.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–62 SIGNAL NAME:
RHE STATUS MESSAGE SOFTWARE FAIL
MEMORY LOCATION: 001455
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates an RHE software failure when watchdog timer (250 milliseconds) has
timed out.
REMARKS: From FCC to RHE.
PASS:
If third digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 8–63.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
