Sony SA-VA100 Service Manual ▷ View online
— 33 —
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M impedance.
4. Clean the object lens by an applicator with neutral detergent when
3. Use an oscilloscope with more than 10M impedance.
4. Clean the object lens by an applicator with neutral detergent when
the signal level is low than specified value with the following
checks.
checks.
5. Adjust the focus bias adjustment when optical block is replaced.
Focus Bias Adjustment
CD board
TP (RF)
TP (VC)
TP (VC)
oscilloscope
Procedure:
1. Connect oscilloscope to test point TP (RF). on CD board.
2. Turned SYSTEM POWER switch on.
3. Put disc (YEDS-18) in to playback the number two track.
4. Adjust RV101 so that the waveform is clear.
1. Connect oscilloscope to test point TP (RF). on CD board.
2. Turned SYSTEM POWER switch on.
3. Put disc (YEDS-18) in to playback the number two track.
4. Adjust RV101 so that the waveform is clear.
(Clear RF signal waveform means that the shape “ ” can be clearly
distinguished at the center of the waveform.)
distinguished at the center of the waveform.)
5. After adjustment, check the RF signal level.
• RF signal
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
level: 1.2 ± 0.2 Vp-p
Procedure :
1. Load CDs into the each tray (seven pieces).
2. Connect oscilloscope to test point TP (FEO).
3. Connect between test point TP (FOK) and Ground by lead wire.
4. The focus search is performed by turning ON the SYSTEM
1. Load CDs into the each tray (seven pieces).
2. Connect oscilloscope to test point TP (FEO).
3. Connect between test point TP (FOK) and Ground by lead wire.
4. The focus search is performed by turning ON the SYSTEM
POWER.
It searches DISC 1-7 in order and stops.
It searches DISC 1-7 in order and stops.
5. Check the oscilloscope waveform (S-curve) is symmetrical be-
tween A and B. And confirm peak to peak level within 2.4 ± 0.7
Vp-p.
Vp-p.
S-curve waveform
S Curve Check
6. After check, remove the lead wire connected in step 3.
Note:
• Try to measure several times to make sure than the ratio of
A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned SYSTEM POWER switch on.
3. Put disc (YEDS-18) in to playback the number two track.
4. Confirm that oscilloscope waveform is clear and check RF signal
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned SYSTEM POWER switch on.
3. Put disc (YEDS-18) in to playback the number two track.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
Note:
Clear RF signal waveform means that the shape “ ” can be
clearly distinguished at the center of the waveform.
clearly distinguished at the center of the waveform.
RF signal waveform
level: 1.2 ± 0.2 Vp-p
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
CD board
TP (FEO)
TP (VC)
TP (VC)
oscilloscope
CD board
TP (RF)
TP (VC)
TP (VC)
oscilloscope
A
B
within 2.4 ± 0.7 Vp-p
symmetry
— 34 —
E-F Balance Check
Procedure:
1. Set the DISC (YEDS-18) in chucking mode.
2. Connect the test point TP (ADJ) of CD board and the ground.
3. Connect oscilloscope to test point TP (TEO).
4. Press DOLBY NR button,
1. Set the DISC (YEDS-18) in chucking mode.
2. Connect the test point TP (ADJ) of CD board and the ground.
3. Connect oscilloscope to test point TP (TEO).
4. Press DOLBY NR button,
p button and DISC 1 button at the
same time in the STANDBY mode.
5. Playback the disc and press the DISC 4 button. (Tracking /sled
OFF)
6. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
Traverse waveform
oscilloscope
CD board
TP (TEO)
TP (VC)
TP (VC)
Specified level: • x 100 = less than ± 7%
• A + B = 250 ± 70 mVp-p
7. Turn the power supply OFF, and remove the read wire connected
in step 2.
A
B
level: 250 ± 70 mVp-p
0V
A – B
2 (A + B)
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.
Adjustment Location:
[CD BOARD] (Conductor Side)
RV101
RF
FOK
RV102
TEO
TEI
FEI
VC
FEO
RV103
IC103
PCK
IC106
ADJ
— 35 —
OSD Color Adjustment
Connection:
frequency counter
IC605
C635
Pin
8
Method:
1. Without anything connected to the external input terminal, press
the SYSTEM POWER button and turn ON the power.
2. Adjust CT602 of the MAIN board so that the reading on the fre-
quency counter becomes 14.31818 MHz
±
180 MHz.
OSD SECTION
OSD Width Adjustment
Note:
Perform “cold reset” before this adjustment.
(Refer to SERVICING NOTE on page 4)
(Refer to SERVICING NOTE on page 4)
Connection:
Set
Video signal
generator
generator
Monitor
Method:
1. Connect the video signal generator to the VIDEO 1 IN jack and
output the cross hatch signal.
2. Turn ON the power, press the FUNCTION button, and set the
input source to VIDEO 1.
3. Taking the center of the monitor screen as center, and adjust CT601
of the MAIN board so that the distances A and B (to the edges of
the function frame) become equal.
the function frame) become equal.
4. If the OSD function frame screen disappears during the adjust-
ment, move the cursor of the remote commander provided. As a
result, the OSD screen will appear again.
result, the OSD screen will appear again.
The cross hatch signal is input with the video signal generator so that
the center of the screen can be identified easily. If there is no device
to output the cross hatch signal, other video signals such as the color
bar signal can be used if these enable the center to be identified eas-
ily.
If these signals are not available, adjust so that the distances C and D
(from the edge of the OSD function frame to edge of the monitor
screen) become equal.
the center of the screen can be identified easily. If there is no device
to output the cross hatch signal, other video signals such as the color
bar signal can be used if these enable the center to be identified eas-
ily.
If these signals are not available, adjust so that the distances C and D
(from the edge of the OSD function frame to edge of the monitor
screen) become equal.
Monitor screen
Center of screen
OSD function frame
A
B
C
D
Adjustment specification:A=B
VIDEO 1 IN
MONITOR OUT
MAIN BOARD (CONDUCTOR SIDE)
MAIN board
Pin
Pin
8
of IC605
(C635)
— 36 —
OSD Color Burst Adjustment
Connection:
Connection 1:
Vectorscope
set
MONITOR OUT
Connection 2:
Monitor
Vectorscope
Monitor
VTR etc.
set
VIDEO 1 IN
MONITOR OUT
Method 1:
1. Without anything connected to the external input terminal (con-
nection 1), press the SYSTEM POWER button and turn ON the
power.
power.
2. Check that the OSD function frame screen is displayed on the
monitor. If no OSD function frame screen is displayed, move the
cursor button of the remote commander provided to display the
screen.
cursor button of the remote commander provided to display the
screen.
3. Observe the vectorscope, and adjust RV601 of the MAIN board
so that the light dots converge in the BLUE area.
4. Connect a dynamic picture video device to the external input ter-
minal (VIDEO 1 IN jack) of this unit (Connection 2).
5. Press the FUNCTION button and set the input source to
VIDEO 1.
6. Move the cursor of the remote commander provided, and display
the OSD function frame.
7. Observe the vectorscope. Check that the light dots in the BLUE
range and the light dots adjusted at 3 are coinciding.
8. If they do not coincide, disconnect the external video device, and
adjust RV601 of the MAIN board again.
9. If the light dots when an external video device is connected and
not connected coincide, it indicates the end of the adjustment.
Method 2: (When no vectorscope is used)
Connection:
Monitor
VTR etc.
set
VIDEO 1 IN
MONITOR OUT
1. Connect a dynamic picture video device to the VIDEO 1 IN jack
of the unit.
2. Press the FUNCTION button, and set the input source to
VIDEO 1.
3. Move the cursor of the remote commander provided, and display
the OSD function frame.
4. Take note of the blue and green screens at the bottom left of the
OSD function frame.
5. Disconnect the video device connected at 1.
6. Adjust RV601 of the MAIN board so that the blue and green parts
6. Adjust RV601 of the MAIN board so that the blue and green parts
at the bottom left of the OSD function frame to the same color as
the images checked at 4.
the images checked at 4.
OSD function frame
Blue and green parts of the frame
Note)
Perform this adjustment when disconnecting the external video de-
vice. If the external video device is connected, there is no meaning in
performing this adjustment due to the use of the color burst of the
external device instead of the internal sync signal.
vice. If the external video device is connected, there is no meaning in
performing this adjustment due to the use of the color burst of the
external device instead of the internal sync signal.
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