Checking The Input Signals; Input/Output Level And Impedance; Alignment Tape - Sony GV-D300 Service Manual

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 video system, the video
output signal must satisfy the given specifications.
Connect the oscilloscope to the VIDEO jack, and check that the
sync signal amplitude of the video signal is approximately <0.286V>
[0.30V], the amplitude of the video section is approximately <0.714>
[0.70V], the amplitude of the burst signal is approximately <0.286>
[0.30V] and flat, and that the level ratio of the burst signal to the
"red" signal is 0.30 : 0.60.
The video signal used for adjusting the video section is shown in
Fig. 5-3-2.
< > : NTSC model
[ ] : PAL model
Note: Measured in the Recording mode.
For NTSC model
White (75%)
0.714V
1V
0.286V
Horizontal sync signal
Color bar signal waveform
For PAL model
White (100%)
0.7V
1V
0.3V
Horizontal sync signal
Color bar signal waveform
3-1-7.

Input/Output Level and Impedance

Video input / output
Phono jack, 1Vp-p, 75 Ω unbalanced, sync negative
S Video input / output
4-pin mini DIN
luminance signal: 1Vp-p, 75 Ω unbalanced, sync negative
Chrominance signal: 0.286Vp-p, 75 Ω unbalanced (NTSC)
0.300Vp-p, 75 Ω unbalanced (PAL)
White (100%)
Burst signal
Q
I
Burst signal
Fig. 5-3-2 Color bar signal of alignment tapes
3-1-6.

Alignment Tape

Use the alignment tape shown in the following table.
Use tapes specified in the signal column of each adjustment.
Name
Tracking standard (XH2-1)
SW/OL standard (XH2-3)
Audio operation check
(XH5-3 (NTSC), XH5-3P (PAL))
System operation check
(XH5-5 (NTSC), XH5-5P (PAL))
BIST check
(XH5-6 (NTSC), XH5-6P (PAL))
Fig. 5-3-2. Shows the 75% color bar signal recorded on the alignment
tape for Audio Operation Check.
Note: Measure with VIDEO jack. (Terminated at 75 Ω)
(75%)
0.286V
0.3V
(100%)
Audio input / output
Phono jack
Input level: 327mV
Input impedance: More than 47kΩ
Output level: 327mV (at load impedance 47kΩ)
Output impedance: Below 2.2kΩ
5-6
Use
Tape path adjustment
Switching position adjustment
Audio system adjustment
Operation check
BIST check
Table. 5-3-1.
Q Black
I
White
(100%)
Color bar pattern
Color bar pattern