TM 1–1520–238–T–3
Change 4
10–5
10–13 SIGNAL NAME:
PNVS COOLED
MEMORY LOCATION: 000411
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
Monitor HOD; memory location response is positive when not cooled and negative
when cooled.
SIGNAL FUNCTION:
Monitors cooler/dewar.
REMARKS: From PNVS through CPG MRTU Type III to FCC.
PASS:
If CONDITION corresponds to proper memory location response, go to Chapter 15, paragraph
15–115.
FAIL: Location of fault: cooler dewar assembly, PNVS, wiring from PNVS to CPG MRTU Type III,
CPG MRTU Type III. Troubleshoot wiring to isolate fault (TM 1–5855–265–T).
10–14 SIGNAL NAME:
PNVS VIDEO SW
MEMORY LOCATION: 000412
MEMORY DATA BIT(S):
12
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates PNVS CPG selection.
REMARKS: From ORT through CPG MRTU Type III to FCC.
PASS:
If third digit on HOD is 0, 1, 4, or 5, go to paragraph 10–15.
FAIL: Location of fault: ORT, wiring from ORT to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
10–15 SIGNAL NAME:
CPG COLLECTIVE TADS/PNVS SELECT 1 (ACY) TADS PNVS SW1 (ACZ)
MEMORY LOCATION: 000414
MEMORY DATA BIT(S):
7
(BINARY)
CONDITION:
If fifth digit displayed on HOD is 0, 2, 4, or 6=TADS
If fifth digit displayed on HOD is 1, 3, 5, or 7=PNVS
SIGNAL FUNCTION:
Indicates TADS/PNVS video selection.
REMARKS: From CPG collective through CPG MRTU Type III to FCC.
PASS:
If CONDITION corresponds to selected switch position, go to paragraph 10–16.
FAIL: Location of fault: CPG collective, wiring from CPG collective to CPG MRTU Type III, CPG
MRTU Type III. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
10–16 SIGNAL NAME:
CPG COLLECTIVE TADS/PNVS SELECT 2 (ACY) TADS PNVS SW2 (ACZ)
MEMORY LOCATION: 000414
MEMORY DATA BIT(S):
8
(BINARY)
CONDITION:
If fifth digit displayed on HOD is 0, 2, 4, or 6=PNVS
If fifth digit displayed on HOD is 1, 3, 5, or 7=TADS
SIGNAL FUNCTION:
Indicates PNVS/TADS selection.
REMARKS: From CPG collective through CPG MRTU Type III to FCC.
PASS:
If CONDITION corresponds to selected switch position, go to paragraph 10–17.
FAIL: Location of fault: CPG collective, wiring from CPG collective to CPG MRTU Type III, CPG
MRTU Type III. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
