TM 1–1520–238–T–3
Change 4
14–15
14–54 SIGNAL NAME:
CPG LOSRET CONT
MEMORY LOCATION: 000657
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates CPG line of sight (LOS) reticle.
REMARKS: From FCC to symbol generator.
PASS:
If first digit displayed on HOD is 2, 3, 6, or 7, go to 14–55.
FAIL: Location of fault: then replace FCC (TM 9–1230–476–20–1).
14–55 SIGNAL NAME:
CPG LOSRET AZ
MEMORY LOCATION: 000656
MEMORY DATA BIT(S):
4–11
(HEX)
CONDITION:
Displays LOSRET azimuth reference when TADS is selected. Monitor HOD; memory
location should indicate negative for left and positive for right.
SIGNAL FUNCTION:
Displays TADS azimuth reference (crosshair) for all symbols.
REMARKS: From FCC to symbol generator.
PASS:
If CONDITION is met, go to 14–56.
FAIL: Location of fault: troubleshoot TADS (TM 1–1270–476–T).
14–56 SIGNAL NAME:
CPG LOSRET EL
MEMORY LOCATION: 000656
MEMORY DATA BIT(S):
12–19
(HEX)
CONDITION:
Displays LOSRET elevation reference when TADS is selected. Monitor HOD; memory
location should indicate negative for down and positive for up.
SIGNAL FUNCTION:
Displays TADS elevation reference (crosshair) for all symbols.
REMARKS: From FCC to symbol generator.
PASS:
Location of fault if elevation cross hairs are not displayed: replace symbol generator
(TM 11–1520–238–23–2).
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–57 SIGNAL NAME:
CPG VIDEO INFO CMD (ACY) CPG INFO SELECT (ACZ)
MEMORY LOCATION: 000657
MEMORY DATA BIT(S):
12–14
(OCTAL)
CONDITION:
If third digit displayed on HOD is 0 or 4, and second digit displayed
on HOD is 4 =FLIR
If third digit displayed on HOD is 1 or 5, and second digit displayed
on HOD is 0 =TV
If third digit displayed on HOD is 1 or 5, and second digit displayed
on HOD is 4 =DVO
If third digit displayed on HOD is 2 or 6, and second digit displayed
on HOD is 0 =FD/LS
SIGNAL FUNCTION:
Selects CPG video readout.
REMARKS: From FCC to symbol generator.
PASS:
If CONDITION corresponds to selected video, go to paragraph 14–58.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
