Checking The Input Signals; S Video Input; Video Input - Sony DSR-25 Service Manual

3-1-3.

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
IN terminal, and check that the sync signal of the Y signal is ap-
proximately <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 IN 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 approximately
<0.67> [0.66] V. The Y and chroma signals used in the adjustment
are shown in Fig. 5-3-2.
< >: NTSC mode
[ ]: PAL mode
For NTSC mode (with setup)
Y Signal
Horizontal sync signal
Chroma Signal
Chroma signal
amplitude
Approx. 0.67 V
For NTSC mode (with setup)
Approx. 0.714 V
Approx.
0.286 V
Horizontal sync signal
White (100%)
Approx. 0.714 V
Approx.
0.286 V
Burst signal
amplitude
Approx. 0.286 V
Burst signal (Should be flat)
Fig. 5-3-2 Color Bar Signal of Pattern Generator
White (Approx. 100%)
Approx.
0.286 V
Red
(Approx. 0.67 V) Burst signal
(Should be flat)
Fig. 5-3-3 Color Bar Signal of Pattern Generator

2. VIDEO Input

Connect the oscilloscope to the VIDEO IN 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 <0.67> [0.66] V.
The video signal (color bar) used for adjustments is shown in Fig.
5-3-3.
< >: NTSC mode
[ ]: PAL mode
For PAL mode
Y Signal
White (100%)
Chroma Signal
Chroma signal
amplitude
Approx. 0.66 V
For PAL mode
White (Approx. 100%)
Approx. 0.7 V
Approx.
0.3 V
Horizontal sync signal
5-43
DSR-25
Approx. 0.70 V
Approx.
0.30 V
Horizontal sync signal
Burst signal
amplitude
Burst signal (Should be flat)
Approx.
0.30 V
Red
(Approx. 0.66 V) Burst signal
(Should be flat)
Approx.
0.30 V