Sony CDP-CX260 Service Manual ▷ View online
– 21 –
5-2. ELECTRICAL BLOCK ADJUSTMENT
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
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.
checks.
S-Curve Check
Procedure :
1. Chuck the disc (YEDS-18) beforehand, and disconnect the power
1. Chuck the disc (YEDS-18) beforehand, and disconnect the power
cord from the outlet.
2. Connect oscilloscope to test point TP (FE1) on BD board.
3. Connect test point TP1 (ADJ) on MAIN board to ground with
3. Connect test point TP1 (ADJ) on MAIN board to ground with
lead wire.
4. The ADJ mode is set when the power cord is inserted into the
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 be-
6. Press the CHECK button.
7. Check the oscilloscope waveform (S-curve) is symmetrical be-
tween A and B. And confirm peak to peak level within 3±1 Vp-p.
S-curve waveform
8. Pressing the p 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
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 bright-
ness to obtain best waveform.
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
E-F Balance Check
Procedure :
1. Chuck the disc (YEDS-18) beforehand, and disconnect the power
1. Chuck the disc (YEDS-18) beforehand, and disconnect the power
cord from the outlet.
2. Connect oscilloscpe to test point TP (TE) on BD board.
3. Connect test point TP1 (ADJ) on MAIN board to ground with
3. Connect test point TP1 (ADJ) on MAIN board to ground with
lead wire.
4. The ADJ mode is set when the power cord is inserted into the
outlet and power is supplied.
5. The fifth track is played automatically.
6. Press the GROUP 3 button. (The tracking servo and the sled-
6. Press the GROUP 3 button. (The tracking servo and the sled-
ding 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%
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.
equal to the A (DC voltage) is step 7.
Traverse waveform
Procedure :
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
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.
9. Disconnect the lead wire of TP1 (ADJ) connected in step 2.
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 mVp-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
– 22 –
Disc Sensor Adjustment
Perform this adjustment after completing all adjustments of the
mechanism section.
If not performed accurately, the presence of the disc may not be
detected properly.
mechanism section.
If not performed accurately, the presence of the disc may not be
detected properly.
Connection 1:
Waveform 1:
Connection 2:
Waveform 2
Procedure:
1. Connect the oscilloscope to Pins
1. Connect the oscilloscope to Pins
1, 2, and 4 of CN506 of the
MAIN board. Also connect a 1 k
Ω
resistor to Pin
4 at the same
time. (Connection 1)
2. Check that no discs are loaded in the unit.
3. With the power OFF, press the 1/u button while pressing the
3. With the power OFF, press the 1/u button while pressing the
INPUT button, and turn on the power at the same time.
4. The rotary table will continue rotating in the clockwise direction.
5. Observe the waveform at that time on the oscilloscope.
6. Loosen the screw securing the D.SENS (LUMINOUS) board
5. Observe the waveform at that time on the oscilloscope.
6. Loosen the screw securing the D.SENS (LUMINOUS) board
slightly.
7. Slide the D.SENS (LUMINOUS) board to the left and right so
that the peak of the D0 waveform is at the center between the
descending point of the T1 waveform and ascending point of the
T2 waveform. (Waveform 1) After adjusting, apply locking
compound.
descending point of the T1 waveform and ascending point of the
T2 waveform. (Waveform 1) After adjusting, apply locking
compound.
8. Disconnect the resistor connected to Pin
4 of CN506 of the
MAIN board. (Connection 2)
9. Observe the waveform on the oscilloscope. (Waveform 2)
10. Adjust RV501 of the MAIN board so that the waveform on the
10. Adjust RV501 of the MAIN board so that the waveform on the
oscilloscope satisfies the following adjustment value 1.
11. Press the 1/u button and turn OFF the power.
12. Press the 1/u button, turn on the power, press the OPEN/
12. Press the 1/u button, turn on the power, press the OPEN/
CLOSE button, and open the front cover. Next rotate the DISC/
CHARACTER dial in the counterclockwise direction
continuously so that the rotary table rotates continuously in the
counterclockwise direction.
CHARACTER dial in the counterclockwise direction
continuously so that the rotary table rotates continuously in the
counterclockwise direction.
13. Observe the waveform on the oscilloscope and confirm that it
satisfies the adjustment value 2 (waveform 3). If it does not,
adjust RV501 of the MAIN board.
adjust RV501 of the MAIN board.
Waveform 3:
CN506 of MAIN board
T1 : Pin
1
(TS. 1)
T2 : Pin
2
(TS. 2)
D0 : Pin
4
(D. SENS)
oscilloscope
1 k
Ω
A
B
T1
T2
D0
CN506 of MAIN board
T1 : Pin
1
(TS. 1)
T2 : Pin
2
(TS. 2)
D1 : Pin
4
(D. SENS)
oscilloscope
X
Z
Y
T1
T2
D1
D.SENS (LUMINOUS) board
X
Z
Y
T1
T2
D1
– 23 –
14. After the adjustment, load a disc only in slit 1, and press the 1/
u button to turn off the power.
15. Press the 1/u button while pressing the PUSH ENTER button
to turn on the power.
16. If the rotary table makes one round, and “YES” is displayed on
the fluorescent indicator tube after it stops, it means that the
adjustment has been performed properly.
adjustment has been performed properly.
Adjustment value 1:
At the shoulder part of waveform D1, T1 becomes H and T2 be-
comes L, and at the same time, the Y width must not be smaller
than 1/4 of the Z width.
In order to satisfy this value more easily, adjust so that X=Y ap-
proximately and observe the deviation of the waveform.
Adjustment value 2:
At the shoulder part of waveform D1, T1 becomes L and T2 be-
comes H, and at the same time, the Y width must not be smaller
than 1/4 of the Z width.
At the shoulder part of waveform D1, T1 becomes H and T2 be-
comes L, and at the same time, the Y width must not be smaller
than 1/4 of the Z width.
In order to satisfy this value more easily, adjust so that X=Y ap-
proximately and observe the deviation of the waveform.
Adjustment value 2:
At the shoulder part of waveform D1, T1 becomes L and T2 be-
comes H, and at the same time, the Y width must not be smaller
than 1/4 of the Z width.
Adjustment Location :
[ BD BOARD ] – Side B –
IC102
IC103
TP
(RF)
TP
(FE1)
TP
(TE)
TP
(VC)
[ MAIN BOARD ] – Component Side –
1
6
RV501
DISC SENSOR
ADJUSTMENT
CN506
TP2
(AFADJ)
TP1
(ADJ)
R540
IC501
R531
– 24 –
SECTION 6
DIAGRAMS
6-1. CIRCUIT BOARDS LOCATION
MAIN board
D.SENS (LUMINOUS) board
T.SENS board
T.MOTOR board
ILLUMINATION board
KEY BOARD board
DISP board
JOG board
DOOR MOTOR board
DOOR SW board
D.SENS (RAY-CATCHER) board
JACK board
BD board
L.SW board
L.MOTOR board
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