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 286 mV, video
video output signals must be within the specification.amplitude is 714 mV, the setup level is 0 mV, and the burst signal
amplitude is 286 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 : 0.705.
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 286 mVFig. 4-3.,
video amplitude is 714 mV, and the setup level is 0 mV. (If using
White (100%)
the VTR with S-VIDEO OUT terminal, check further that the
White (75%)
chroma signal and burst signal do not remain.)
Also, connect an oscilloscope to the chroma signal pin of the S-
VIDEO IN connector, and check that the burst signal amplitude of
714 ? 3 mV
chroma signal is 286 mV and it is flat, and moreover,535 the ampli- ? 3 mV
tude ratio of burst signal to c0.30 :hroma signal is 0.705. The Y
signal and chroma signal used for adjustment are shown in286 ? 3 mV
Fig. 4-2.286 ? 3 mV
Black
Red
Setup lev Potential difel:ference between black and pedestalPedestalBurst signal
672 ? 3 mV
Horizontal sync signal(to be flat)
Y signalWhite (100%)Fig. 4-3 Color bar signal of pattern generator
White (75%)(at terminating resistance 75 W )
Black714 ? 3 mV
535 ? 3 mV
286 ? 3 mV
Pedestal
Horizontal
sync signal
Chroma signal
Chroma
286 ? 10 mV
amplitude
Burst signal
(to be flat)
Burst amplitude : chroma amplitude = 0.30 : 0.705
Fig. 4-2 Color bar signals of pattern generator
(at terminating resistance 75 W )
4-2 |
ACEC
