Sony GV-A500 Service Manual ▷ View online
5-14
3-1-4.
Connecting the Equipments
Connect the measuring instruments as shown in Fig. 5-3-1 according
to the input terminal specifications (VIDEO input or S VIDEO
input), and perform the adjustments.
The input terminal is specified in the (
to the input terminal specifications (VIDEO input or S VIDEO
input), and perform the adjustments.
The input terminal is specified in the (
) in the signal column.
Either input terminal can be used when there are no specifications.
Note 1 :
If the VIDEO input is used for adjustments which specify
for the S VIDEO input to be used, the product
specifications of the unit may not be satisfied in some
cases. Be sure to perform according to the specifications.
for the S VIDEO input to be used, the product
specifications of the unit may not be satisfied in some
cases. Be sure to perform according to the specifications.
Note 2 :
When adjustments are performed with the S video output
terminal VTR as the signal source, the efficiencies of the
unit may be affected by the VTR. It is recommended that
a pattern generator with a Y/C separation output terminal
be used as much as possible.
terminal VTR as the signal source, the efficiencies of the
unit may be affected by the VTR. It is recommended that
a pattern generator with a Y/C separation output terminal
be used as much as possible.
Connecting the TV Monitor and Regulated Power Supply
[S VIDEO Input]
• When the pattern generator has a Y/C separation output terminal
• When the pattern generator has no Y/C separation
output terminal
Connecting the Pattern Generator
[VIDEO Input]
[VIDEO Input]
Fig. 5-3-1.
Note 1: The TV monitor cannot be connected.
Monitor on the LCD.
Monitor on the LCD.
Connect when using
playing back
playing back
TV monitor
VIDEO
VIDEO terminal
Main Unit
Battery terminal
Regulated power supply
7.2
7.2
±
0.1 Vdc
VIDEO terminal
1 Vp-p
VIDEO
Main Unit
Pattern generator
Video output
(75
(75
Ω
)
Pattern generator
Y output (75
Ω
)
Chroma output (75
Ω
)
S VIDEO terminal
Main Unit
VTR with S video terminal
(E-E mode)
(E-E mode)
Video output
S video output
Video output (75
Ω
)
Pattern generator
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.
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
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
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
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
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
0.286V
White (100%)
Approx. 0.714V
Approx.
0.286V
0.286V
Horizontal sync signal
Burst amplitude
Burst signal
(Should be flat)
(Should be flat)
Chroma
amplitude
amplitude
For PAL model
Y Signal
Chroma Signal
White (100%)
Approx. 0.70V
Horizontal sync signal
Burst amplitude
Burst signal
(Should be flat)
(Should be flat)
Chroma
amplitude
amplitude
Approx.
0.30V
0.30V
Approx.
0.30V
0.30V
Y Signal
Chroma Signal
Approx. 0.7V
Approx.
0.3V
0.3V
Red
Horizontal sync signal
Burst signal
(Should be flat)
(Should be flat)
White (Approx. 100%)
Approx.
0.3V
0.3V
Approx. 0.714V
Approx.
0.286V
0.286V
Red
Horizontal sync signal
Burst signal
(Should be flat)
(Should be flat)
White (Approx. 100%)
Approx.
0.286V
0.286V
Fig. 5-3-3. Color Bar Signal of Pattern Generator
5-16
3-1-6.
Alignment Tape
The following table lists alignment tapes which are available.
Use the tape specified in the signal column for each adjustment.
If the type of tape to be used for checking operations is not specified,
use whichever type.
Use the tape specified in the signal column for each adjustment.
If the type of tape to be used for checking operations is not specified,
use whichever type.
Name
Tracking
WR5-1NP (NTSC)
WR5-1CP (PAL)
WR5-1NP (NTSC)
WR5-1CP (PAL)
Video frequency
characteristics
WR5-7NE (NTSC)
WR5-7CE (PAL)
characteristics
WR5-7NE (NTSC)
WR5-7CE (PAL)
Operation check
(SP mode)
WR5-5NSP (NTSC)
WR5-5CSP (PAL)
(SP mode)
WR5-5NSP (NTSC)
WR5-5CSP (PAL)
Operation check
(SP mode)
WR5-8NSE (NTSC)
WR5-8CSE (PAL)
(SP mode)
WR5-8NSE (NTSC)
WR5-8CSE (PAL)
Operation check
(LP mode)
WR5-4NL (NTSC)
WR5-4CL (PAL)
(LP mode)
WR5-4NL (NTSC)
WR5-4CL (PAL)
Operation check
(LP mode)
WR5-8NLE (NTSC)
WR5-8CLE (PAL)
(LP mode)
WR5-8NLE (NTSC)
WR5-8CLE (PAL)
AFM stereo
Operation check
WR5-9NS (NTSC)
WR5-9CS (PAL)
Operation check
WR5-9NS (NTSC)
WR5-9CS (PAL)
BPF adjustment
WR5-11NS (NTSC)
WR5-11CS (PAL)
WR5-11NS (NTSC)
WR5-11CS (PAL)
Record
-ing
mode
Standard
8 mm
Hi8
Standard
8 mm
Hi8
Standard
8 mm
Hi8
Standard
8 mm
Hi8
Tape
type
MP
ME
MP
ME
MP
ME
MP
MP
Tape
speed
SP
SP
(NTSC)
LP
(PAL)
SP
SP
LP
LP
SP
SP
Usage
Tape path
adjustment
Switching
position
adjustment
adjustment
Switching
position
adjustment
Frequency
characteristics
adjustment
characteristics
adjustment
Checking
operations
AFM stereo
Checking
operations
Checking
operations
BPF
adjustment
adjustment
5-17
Fig. 5-3-4. Shows the color bar signals recorded on the alignment
tape.
tape.
For NTSC model
For PAL model
Color bar Pattern
Note :
Measure using the VIDEO terminal (Terminated at 75
Ω
).
Fig. 5-3-4. Color Bar Signals of the Alignment Tape
1V
0.714V
0.286V
Horizontal sync signal
Q
I
White (75%)
Yellow
White (100%)
Cyan
Green
Magenta
Red
Blue
Burst signal
0.286V
White
(75%)
White
(100%)
Q
I
Black
Cy
an
Y
ello
w
Green
Magenta
Red
Blue
0.7 V
0.3 V
1V
Horizontal sync signal
Burst signal
(It must be flat.)
(It must be flat.)
0.3 V
Y
ellow
White (100%)
Cyan
Green
Magenta
Red
Blue
White(100%)
Blac
k
Cy
an
Y
ello
w
Green
Magenta
Red
Blue
Color bar Pattern
Color bar signal waveform
Color bar signal waveform
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