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6-6. TBC-23 Board Replacement
3. TBC Y/C Delay Confirmation
Measuring equipment: Composite waveform/vector monitor.
C phase confirmation [to step (4)]
(1) Set the composite waveform/vector monitor as follwors:
WAVEFORM mode, SWEEP: 2H, MAG ON, INPIT: CH-A, INT REF
LINE SELECT: 183 to 202 for NTSC/218 to 241 for PAL
(2) Playback the bowtie signal portion (17:00 to 19:00) of the alignment tape CR5-1B or CR5-1B PS.
(DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
(3) Observe the 12.5T (PAL: 10T) portion of bowtie signal, confirm that the waveform satisfies the
specification.
If the specification is not satisfied, perform steps (5) through (19).
(4) Stop the playback of the alignment tape CR5-1B/CR5-1B PS or eject it.
6-84
Spec.
OK
OK
NG
Y lag
behind
chroma
12.5 T (for NTSC)
10 T
(for PAL)
NG
Y lead
chroma
DNW-A22/A22P
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