Sony DSR-20MD, Service Manual

Page: 152 / 225

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3-1-4. Checking the Input Signals
Because the video signal obtained from the pattern generator is
used as the adjustment signal for adjustments, 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
input 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 sig-
nal and burst signal have not remained)
Connect the oscilloscope to the chroma signal terminal of the S
VIDEO input terminal, and check that the burst signal amplitude
of the chroma signal is approximately <0.286> [0.30] V and flat,
and that the red signal amplitude of the chroma signal is approxi-
mately <0.66> [0.67] V. The Y and chroma signals used in the
adjustment are shown in Fig. 5-3-2.
< >: NTSC model
[ ]: PAL model
2. VIDEO Input
Connect the oscilloscope to the VIDEO input 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 approxi-
mately <0.714> [0.70] V, the amplitude of the burst signal is ap-
proximately <0.286> [0.30] V and flat, and that the red signal am-
plitude of the chroma signal is approximately <0.66> [0.67] V.
The video signal (color bar) used for adjustments is shown in Fig.
5-3-3.
< >: NTSC model
[ ]: PAL model
NTAC : DSR-20MD
PAL
: DSR-20MDP
Fig. 5-3-2. Color Bar Signal of Pattern Generator
Fig. 5-3-3. Color Bar Signal of Pattern Generator
For NTSC model
Y Signal
White (100%)
Approx. 0.714 V
Approx.
0.286 V
Horizontal sync signal
For PAL model
Y Signal
White (100%)
Approx. 0.70 V
Approx.
0.30 V
Horizontal sync signal
Chroma Signal
Chroma signal
amplitude
Approx. 0.67 V
Burst signal
amplitude
Approx. 0.286 V
Burst signal (Should be flat)
Chroma Signal
Chroma signal
amplitude
Approx. 0.66 V
Burst signal
amplitude
Approx.
0.30 V
Burst signal (Should be flat)
For NTSC model
Approx. 0.714 V
Approx.
0.286 V
Horizontal sync signal
Red
(Approx. 0.67 V) Burst signal
(Should be flat)
White (Approx. 100%)
Approx.
0.286 V
Approx. 0.7 V
Approx.
0.3 V
Horizontal sync signal
Red
(Approx. 0.66 V) Burst signal
(Should be flat)
White (Approx. 100%)
Approx.
0.30 V
For PAL model