Sony GV-D300 Operating Instructions (primary manual), Service Manual

Page: 70 / 148

5-6
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.
3-1-6. Alignment Tape
Use the alignment tape shown in the following table.
Use tapes specified in the signal column of each adjustment.
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
)
Use
Tape path adjustment
Switching position adjustment
Audio system adjustment
Operation check
BIST check
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))
1V
0.7V
0.3V
White (100%)
Y
e
llo
w
Cy
an
Green
Magenta
Red
Blue
Burst signal
Horizontal sync signal
0.3V
(100%)
Y
ello
w
Cy
an
Green
Magenta
Red
Blue
White
Blac
k
1V
0.714V
0.286V
White (75%)
White (100%)
Y
ello
w
Cy
an
Green
Magenta
Red
Blue
Burst signal
0.286V
Q
I
Horizontal sync signal
(75%)
White
Y
ello
w
Cy
an
Green
Magenta
Red
Blue
Q I
White
(100%)
Black
For NTSC model
For PAL model
Color bar signal waveform Color bar pattern
Color bar signal waveform Color bar pattern
Fig. 5-3-2 Color bar signal of alignment tapes
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)
Audio input / output
Phono jack
Input level: 327mV
Input impedance: More than 47k
Ω
Output level: 327mV (at load impedance 47k
Ω
)
Output impedance: Below 2.2k
Ω
Table. 5-3-1.