Sony GV-A500E, Service Manual

Page: 74 / 127

5-15
3-1-5. Checking the Input Signals
Because the video signal obtained from the pattern generator is
used as the adjustment signal for adjusting the VTR section, the
video output signal must satisfy the given specifications.
1. S VIDEO input
Connect the oscilloscope to the Y signal terminal of the S VIDEO
terminal, and check that the sync signal of the Y signal is
approximately <0.286> [0.30]V and that the amplitude of the video
section is approximately <0.714> [0.70]V. (When a VTR with the
S VIDEO output terminal is used, also check that the chroma signal
and burst signal have not remained.) Connect the oscilloscope to
For NTSC model
Note : Be sure to check in the recording mode.
Note : Be sure to check in the recording mode.
Burst signal amplitude :Chroma amplitude =0.30:0.66
Burst signal amplitude :Chroma amplitude =0.30:0.66
For NTSC model
Note : Be sure to check in the record mode.
For PAL model
Note : Be sure to check in the record mode.
the chroma signal terminal of the S VIDEO terminal, and check
that the burst signal amplitude of the chroma signal is approximately
<0.286>[0.30]V and flat, and that the amplitude ratio of the burst
signal to the chroma signal is 0.30:0.66. The Y and chroma signals
used in the adjustment are shown in Fig. 5-3-2.
< > : NTSC model
[ ] : PAL model
Fig. 5-3-2. Color bar signal of pattern generator
2. VIDEO input
Connect the oscilloscope to the VIDEO terminal, and check that
the sync signal amplitude of the video signal is approximately
<0.286> [0.30]V, the amplitude of the video section is approximately
<0.714> [0.70]V, the amplitude of the burst signal is approximately
<0.286> [0.30]V and flat, and that the level ratio of the burst signal to the “red” signal is 0.30 : 0.66.
The video signal (color bar) used for adjusting the VTR section is
shown in Fig. 5-3-3.
< > : NTSC model
[ ] : PAL model
Approx.
0.286V
White (100%)
Approx. 0.714V
Approx.
0.286V
Horizontal sync signal
Burst amplitude
Burst signal
(Should be flat)
Chroma
amplitude
For PAL model
Y Signal
Chroma Signal
White (100%)
Approx. 0.70V
Horizontal sync signal
Burst amplitude
Burst signal
(Should be flat)
Chroma
amplitude
Approx.
0.30V
Approx.
0.30V
Y Signal
Chroma Signal
Approx. 0.7V
Approx.
0.3V
Red
Horizontal sync signal
Burst signal
(Should be flat)
White (Approx. 100%)
Approx.
0.3V
Approx. 0.714V
Approx.
0.286V
Red
Horizontal sync signal
Burst signal
(Should be flat)
White (Approx. 100%)
Approx.
0.286V
Fig. 5-3-3. Color Bar Signal of Pattern Generator