TM 1–1520–238–T–3
Change 4
21–5
21–9 SIGNAL NAME:
VIDEO RECORDER IS RECORDING (ACY) VCR RECORDING (ACZ)
MEMORY LOCATION: 002132
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates video is being recorded.
REMARKS: From video recorder through DASEC to FCC. RECORDER is displayed on HOD. If video
recorder fails to record after four seconds, RCDR FAIL appears on HOD.
PASS:
If fifth digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 21–10.
FAIL: Location of fault: video recorder, wiring from video recorder to DASEC, DASEC. Troubleshoot
wiring to isolate fault (TM 11–1520–238–23–2).
21–10 SIGNAL NAME:
RECORD CHANNEL SELECTED (ACY) RECORD SEL CTL (ACZ)
MEMORY LOCATION: 000654
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
If the third digit displayed on HOD is 0, 2, 4, or 6=CPG
If the third digit displayed on HOD is 1, 3, 5, or 7=PILOT
SIGNAL FUNCTION:
Records symbol generator selected video.
REMARKS: From FCC to symbol generator.
PASS:
Location of fault if CONDITION corresponds to selected record channel: replace symbol
generator (TM 11–1520–238–23–1).
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
21–11 SIGNAL NAME:
PILOT VIDEO MODE
MEMORY LOCATION: 000654
MEMORY DATA BIT(S):
8–11
(HEX)
CONDITION:
If the fourth digit displayed on HOD is 1, 3, 5, or 7=PLAY
SIGNAL FUNCTION:
Directs symbol generator to play pilot’s video.
REMARKS: From FCC to symbol generator.
PASS:
Location of fault if CONDITION corresponds to play: replace symbol generator
(TM 11–1520–238–23–2).
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
21–12 SIGNAL NAME:
CPG VIDEO MODE
MEMORY LOCATION: 000655
MEMORY DATA BIT(S):
8–11
(HEX)
CONDITION:
If the fourth digit is displayed on HOD is 1, 3, 5, or 7=PLAY
SIGNAL FUNCTION:
Directs symbol generator to play CPG video.
REMARKS: From FCC to symbol generator.
PASS:
If CONDITION corresponds to play: replace symbol generator (TM 11–1520–238–23–2).
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
