Sony CDP-CX400 / CDP-CX450 Service Manual ▷ View online
17
Holder (table sensor 400)
S tight, screw
(PTTWH 3
(PTTWH 3
×
6)
Swing
Table (400) assembly
At this position,this
part will be locked.
part will be locked.
Sensor Adjustment
1.
Enter the adjustment mode and select “Mech Adjust” with the
JOG dial, and press the dial.
JOG dial, and press the dial.
2.
Press the GROUP 1 button to operate the loading mechanism,
and continue pressing until the disc table locks. (Fig-3)
and continue pressing until the disc table locks. (Fig-3)
3.
Loosen the fixing screw and move the holder so that both PLAY
button LED (green) and the ARTIST MODE button LED
(green) light.
If the holder is not in the correct position, the MEGA
CONTROL button LED (orange) or the PAUSE button LED
(orange) lights.
button LED (green) and the ARTIST MODE button LED
(green) light.
If the holder is not in the correct position, the MEGA
CONTROL button LED (orange) or the PAUSE button LED
(orange) lights.
4.
Moving the disc table right and left with a hand after the screw
is fixed, the table will move by the play of a disc table. If the
LEDs light up alternately, the adjustment will be performed
correctly. (Fig-4)
is fixed, the table will move by the play of a disc table. If the
LEDs light up alternately, the adjustment will be performed
correctly. (Fig-4)
FIg-3
FIg-4
MEGA CONTROL
ARTIST MODE
18
6-2. ELECTRICAL ADJUSTMENT
Note:
1.
CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
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
Ω
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.
when the signal level is low than specified value with the
following checks.
S-Curve Check
Procedure :
1.
1.
Chuck the disc (YEDS-18) beforehand, and disconnect the
power cord from the outlet.
power cord from the outlet.
2.
Connect oscilloscope to test point TP (FE1) on BD board.
3.
Connect test point (ADJ) on MAIN board to ground with lead
wire.
wire.
4.
The ADJ mode is set when the power cord is inserted into the
outlet and power is supplied.
outlet and power is supplied.
5.
The fifth track is played automatically.
6.
Press the CHECK button.
7.
Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3±1
Vp-p.
between A and B. And confirm peak to peak level within 3±1
Vp-p.
S-curve waveform
8.
Pressing the
1/u button stops the output of the waveform (s
curve).
9.
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
brightness to obtain best waveform.
Adjustment Location: BD board (See page 19)
RF Level Check
Note: A clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
RF signal waveform
Adjustment Location: BD board (See page 19)
E-F Balance Check
Procedure :
1.
1.
Chuck the disc (YEDS-18) beforehand, and disconnect the
power cord from the outlet.
power cord from the outlet.
2.
Connect oscilloscpe to test point TP (TE) on BD board.
3.
Connect test point (ADJ) on MAIN board to ground with lead
wire.
wire.
4.
The ADJ mode is set when the power cord is inserted into the
outlet and power is supplied.
outlet and power is supplied.
5.
The fifth track is played automatically.
6.
Press the GROUP 3 button. (The tracking servo and the
sledding servo are turned OFF.)
sledding servo are turned OFF.)
7.
Check the level B of the oscilliscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Traverse waveform
8.
Press the GROUP 8 button. (The tracking servo and sledding
servo are turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 7.
servo are turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 7.
Traverse waveform
Procedure :
1.
1.
Connect oscilloscope to test point TP (RF) on BD board.
2.
Turn Power switch on.
3.
Put disc (YEDS-18) in to play the number five track.
4.
Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
signal level is correct or not.
Oscilloscope
BD board
TP (FE1)
TP (VC)
TP (VC)
Symmetry
A
B
Within 3
±
1 Vp-p
Oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.2 Vp-p
+0.25
–0.20
–0.20
Oscilloscope
BD board
TP (TE)
TP (VC)
TP (VC)
0V
Level : 1.3
±
0.6 Vp-p
A (DC voltage)
Center of the waveform
B
0V
C (DC
voltage)
voltage)
Tracking servo
Sledding servo
OFF
Sledding servo
OFF
Tracking servo
Sledding servo
ON
Sledding servo
ON
9.
Disconnect the lead wire of TP1 (ADJ) connected in step 2.
Adjustment Location: BD board (See page 19)
19
1.
Connect the oscilloscope to Pins 1, 2, and 3 of TP1 of the
MAIN board.
MAIN board.
2.
Check that no discs are loaded in the unit.
3.
With the power ON, while pressing the GROUP FILE and
MEGA CONTROL buttons, press the
1/u button. Rotate
the DISC/CHARACTER dial, select “Table Rotation” and
press the dial.
The disc table starts to rotate in the clockwise direction.
press the dial.
The disc table starts to rotate in the clockwise direction.
4.
Loosen the fixing screw, move the mounting board (SENSOR),
and secure the mounting board (SENSOR) at the point the H
portion of the T.P waveform comes the center of the H portion
of the D.S waveform.
and secure the mounting board (SENSOR) at the point the H
portion of the T.P waveform comes the center of the H portion
of the D.S waveform.
Disc Sensor Adjustment
Be sure to perform this adjustment after sensor adjustment in
MECHANICAL ADJUSTMENT.
MECHANICAL ADJUSTMENT.
Connection:
Waveform:
5.
Rotate the DISC/CHARACTER knob in the counterclockwise
direction and the disc table starts to rotate in the same direction.
Check that the waveform at this time is the same as that in step
4. If larger by a considerable extent, rotate the DISC/
CHARACTER knob in the clockwise direction and the disc
table starts to rotate in the same direction. Repeat from step 4.
direction and the disc table starts to rotate in the same direction.
Check that the waveform at this time is the same as that in step
4. If larger by a considerable extent, rotate the DISC/
CHARACTER knob in the clockwise direction and the disc
table starts to rotate in the same direction. Repeat from step 4.
6.
Rotate RV501 of the MAIN board and adjust so that the H and
L portions of the D.S waveform become the same.
L portions of the D.S waveform become the same.
S tight, screw
(PTTWH 3
(PTTWH 3
×
6)
D. sens (out) board
D.S: Pin
1
T.P: Pin
3
Oscilloscope
D.S
GND
T.P
GND
T.P
MAIN board
TP1
CH1
CH2
CH2
D.S
T.P
CH1
CH2
D.S
T.P
CH1
CH2
Should be at the center
D.S
CH1
Adjust so that these widths
become the same.
become the same.
Adjustment Location
[ BD BOARD ] – Side B –
IC102
IC103
TP
(RF)
TP
(FE1)
TP
(TE)
TP
(VC)
20
SECTION 7
DIAGRAMS
7-1. CIRCUIT BOARDS LOCATION
LED board
MAIN board
TRANS board
D. MOTOR board
JOG board
BD board
DOOR SW board
T. SENS board
KEY board
D. SENS
(OUT) board
(OUT) board
DISPLAY board
D. SENS (IN) board
LOADING SW board
L. T. MOTOR board
LOCK SW board
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