TM 1–1520–238–T–3
Change 4
8–23
8–63 SIGNAL NAME:
RHE STATUS WORD TIMEOUT ERROR
MEMORY LOCATION: 001455
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 8–64.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–64 SIGNAL NAME:
RHE STATUS WORD RHE FAIL (ACY) HARDWARE FAIL (ACZ)
MEMORY LOCATION: 001455
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
FAIL indicates that RHE has failed.
REMARKS: From FCC to RHE.
PASS:
Location of fault if fourth digit displayed on HOD is 0: wiring between CPG FCP and RHE.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–65 SIGNAL NAME:
RHE STATUS WORD TERMINAL FLAG (ACY) RHE RECEIVE MSG (ACZ)
MEMORY LOCATION: 001515
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates an error has been detected by RHE DMA controller.
REMARKS: From FCC to RHE.
PASS:
If first digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 8–73.
FAIL: Location of fault: go to paragraph 8–67.
8–66 SIGNAL NAME:
RHE STATUS WORD CHECKSUM ERROR
MEMORY LOCATION: 001515
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 8–67.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–67 SIGNAL NAME:
RHE STATUS WORD SUBSYSTEM BUSY
MEMORY LOCATION: 001515
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 8–68.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
