3. Input Signal Check(2) When VIDEO is input
The video circuit adjustment uses as adjustment signals the videoConnect an oscilloscope to the VIDEO IN terminal, and check
signals obtained from the pattern generator, and therefthat the sync signal amplitude of ore theseVIDEO signal is 300 mV, video
video output signals must be within the specification.amplitude is 700 mV, the setup level is 0 mV, and the burst signal
amplitude is 300 mV and it is flat. Also, check that the level ratio
(1) When S-VIDEO is inputof burst signal to red signal is 0.3 : 0.66.
Connect an oscilloscope to the Y signal pin of the S-VIDEO INThe VIDEO signal (color bars) used for adjustment is shown in
connector, and check that the sync signal of Y signal is 300 mVFig. 4-3.,
video amplitude is 700 mV, and the setup level is 0 mV. (If using
the VTR with S-VIDEO OUT terminal, check further that the
chroma signal and burst signal do not remain.)
Also, connect an oscilloscope to the chroma signal pin of the S-White (Approx. 100%)
Burst signal
VIDEO IN connector, and check that the burst signal amplitude of(To be flat)
chroma signal is 300 mV and it is flat, and moreoverAppro, the ampli-x.
tude ratio of burst signal to chroma signal is 0.30 : 0.66. The Y0.7 V
signal and chroma signal used for adjustment are shown inApprox.
Fig. 4-2.Approx.0.3 V
Red0.3 V
Setup lev Potential difel:ference between black and pedestalHorizontal sync signal
Y signalFig. 4-3 Color bar signal of pattern generator
(at terminating resistance 75 W )
White (100%)
Black
Approx. 700 mV
Approx.
300 mVPedestal
Horizontal
sync signal
Chroma signal
300 ? 10 mV
Chroma
amplitude
Burstsignal
to be flat
Burst amplitude : chroma amplitude = 0.30 : 0.66
Fig. 4-2 Color bar signals of pattern generator
(at terminating resistance 75 W )
4-2 |