TM 1–1520–238–T–3
8–24
Change 4
8–68 SIGNAL NAME:
RHE STATUS MESSAGE SEQUENCE ERROR
MEMORY LOCATION: 001515
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 8–69.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–69 SIGNAL NAME:
RHE STATUS FIRE INTERLOCK
MEMORY LOCATION: 001515
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 8–70.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–70 SIGNAL NAME:
RHE STATUS MESSAGE SOFTWARE FAIL
MEMORY LOCATION: 001515
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 8–71.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–71 SIGNAL NAME:
RHE STATUS WORD TIMEOUT ERROR
MEMORY LOCATION: 001515
MEMORY DATA BIT(S):
12
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
FAIL indicates that 100 milliseconds have elapsed without a proper message
from FCC.
REMARKS: From FCC to RHE.
PASS:
If third digit displayed on HOD is 0, 1, 4, or 5, go to paragraph 8–72.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–72 SIGNAL NAME:
RHE STATUS WORD RHE FAIL (ACY) HARDWARE FAIL (ACZ)
MEMORY LOCATION: 001515
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
FAIL indicates that RHE has failed.
REMARKS: From FCC to RHE.
PASS:
Troubleshoot wiring between CPG FCP and RHE to isolate fault (TM 9–1230–476–20–2).
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
