Sony CDP-CX55 Service Manual ▷ View online
— 25 —
SECTION 6
ELECTRICAL ADJUSTMENTS
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
10. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
11. Turn OFF the power, and remove the lead wire connected at
step 7.
Note : A clear RF signal waveform means that the shape “
◊
” can
be clearly distinguished at the center of the waveform.
RF signal waveform
oscilloscope
BD board
TP (FE)
TP (VC)
TP (VC)
Procedure :
1. Press the POWER button and turn ON the power supply.
2. Open the front cover, and press the PLUS ONE button.
3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the POWER button and turn OFF the power.
6. Connect the oscilloscope to TP (FE) of the BD board.
7. Connect TP302 (ADJ) of the MAIN board and connect TP303
1. Press the POWER button and turn ON the power supply.
2. Open the front cover, and press the PLUS ONE button.
3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the POWER button and turn OFF the power.
6. Connect the oscilloscope to TP (FE) of the BD board.
7. Connect TP302 (ADJ) of the MAIN board and connect TP303
(GND) with a lead wire.
8. Press the POWER button and turn ON the power.
9. The first track will be played back automatically. When the
9. The first track will be played back automatically. When the
CHECK button is pressed, “S-JI mode” will be displayed on
the fluorescent indicator tube, and focus search will be repeated.
the fluorescent indicator tube, and focus search will be repeated.
10. Check the oscilloscope waveform (S-curve) is symmetrical be-
tween A and B. And confirm peak to peak level within 1.8 ± 0.6
Vp-p.
Vp-p.
S-curve waveform
symmetry
within 1.8 ± 0.6Vp-p
A
B
11. Turn OFF the power, and remove the lead wire connected at
step 7.
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.
RF Level Check
oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
Procedure :
1. Press the POWER button and turn ON the power supply.
2. Open the front cover, and press the PLUS ONE button.
3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the POWER button and turn OFF the power.
6. Connect the oscilloscope to TP (RF) of the BD board.
7. Connect TP302 (ADJ) of the MAIN board and connect TP303
1. Press the POWER button and turn ON the power supply.
2. Open the front cover, and press the PLUS ONE button.
3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the POWER button and turn OFF the power.
6. Connect the oscilloscope to TP (RF) of the BD board.
7. Connect TP302 (ADJ) of the MAIN board and connect TP303
(GND) with a lead wire.
8. Press the POWER button and turn ON the power.
9. Playback the fifth track of the disc.
9. Playback the fifth track of the disc.
level : 1.8 ±
Vp-p
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
+0.3
–0.2
–0.2
E-F Balance (Traverse) Check
The procedure for this checking method differs for when a general
remote control unit is used and not used.
remote control unit is used and not used.
TP (TE)
TP (VC)
TP (VC)
BD board
oscilloscope
When a general remote commander is used:
1. Press the POWER button and turn ON the power supply.
2. Open the front cover, and press the PLUS ONE button.
3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the POWER button and turn OFF the power.
6. Connect the oscilloscope to TP (TE) of the BD board.
7. Connect TP302 (ADJ) of the MAIN board and connect TP303
1. Press the POWER button and turn ON the power supply.
2. Open the front cover, and press the PLUS ONE button.
3. Set the disc (YEDS-18) into the “PLUS ONE” slit.
4. Close the front cover, and chuck the disc.
5. Press the POWER button and turn OFF the power.
6. Connect the oscilloscope to TP (TE) of the BD board.
7. Connect TP302 (ADJ) of the MAIN board and connect TP303
(GND) with a lead wire.
8. Press the POWER button and turn ON the power.
9. Playback the fifth track of the disc.
10. Press the 3 button on the remote commander. (The tracking
9. Playback the fifth track of the disc.
10. Press the 3 button on the remote commander. (The tracking
servo and the sledding servo are turned OFF.)
11. 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 ± 10%
Confirm the following :
A/B x 100 = less than ± 10%
Traverse waveform
A (DC voltage)
B
Center of the waveform
level : 0.7 ± 0.3 Vp-p
12. Press the 8 button on the remote control unit. (The tracking
servo and sledding servo are turned ON.) Confirm the C (DC
voltage) is almost equal to the A (DC voltage) is step 11.
voltage) is almost equal to the A (DC voltage) is step 11.
Traverse waveform
0V
C (DC
voltage)
voltage)
Tracking servo
Sled servo
Sled servo
ON
Tracking servo
Sled servo
Sled servo
OFF
13. Turn OFF the power, and remove the lead wire connected at
step 7.
0V
— 26 —
RF PLL Free-run Frequency Check
Procedure :
1. Connect the frequency counter to TP (PLCK) of the BD board.
1. Connect the frequency counter to TP (PLCK) of the BD board.
frequency counter
BD board
TP (PLCK)
2. Press the POWER button and turn ON the power supply.
3. Open the front cover, and press the PLUS ONE button.
4. Set the disc (YEDS-18) into the “PLUS ONE” slit.
5. Close the front cover, and chuck the disc.
6. Playback the fifth track of the disc.
7. Confirm that reading on frequency counter is 4.3218 MHz ± 30
3. Open the front cover, and press the PLUS ONE button.
4. Set the disc (YEDS-18) into the “PLUS ONE” slit.
5. Close the front cover, and chuck the disc.
6. Playback the fifth track of the disc.
7. Confirm that reading on frequency counter is 4.3218 MHz ± 30
kHz.
About RV601 on the MAIN board
RV601 of the MAIN board requires no adjustments. Please note
that it should be dixed to mechanical center position when you moved
and do not know origin position.
that it should be dixed to mechanical center position when you moved
and do not know origin position.
When a general remote commander is not used:
1. Solder lead wires to TP (DVDD) and TP (TOFF) on the BD
1. Solder lead wires to TP (DVDD) and TP (TOFF) on the BD
board severally.
2. Connect the oscilloscope to TP (TE) of the BD board.
3. Press the POWER button and turn ON the power supply.
4. Open the front cover, and press the PLUS ONE button.
5. Set the disc (YEDS-18) into the “PLUS ONE” slit.
6. Close the front cover, and chuck the disc.
7. Playback the fifth track of the disc.
8. Short-circuit the lead wire connected at step 1. (The tracking
3. Press the POWER button and turn ON the power supply.
4. Open the front cover, and press the PLUS ONE button.
5. Set the disc (YEDS-18) into the “PLUS ONE” slit.
6. Close the front cover, and chuck the disc.
7. Playback the fifth track of the disc.
8. Short-circuit the lead wire connected at step 1. (The tracking
servo is turned OFF)
9. 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 ± 10%
Confirm the following :
A/B x 100 = less than ± 10%
Traverse waveform
A (DC voltage)
10. Disconnect the lead wire short-circuited at step 8. (The track-
ing servo is turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 8.
equal to the A (DC voltage) is step 8.
Traverse waveform
0V
11. Turn OFF the power, and remove the lead wire connected at
step 1.
B
Center of the waveform
level : 0.7 ± 0.3 Vp-p
C (DC
voltage)
voltage)
Tracking servo
OFF
Tracking servo
ON
0V
— 27 —
Adjustment Location :
[ BD BOARD ] — CONDUCTOR SIDE —
IC102
IC101
TP
(VC)
TP
(TE)
TP
(FE)
TP
(RF)
TP
(PLCK)
CN101
CN102
CN103
TP
(DVDD)
TP
(TOFF)
[ MAIN BOARD ] — CONDUCTOR SIDE —
IC501
IC201
CN702
CN704
TP302 (ADJ)
TP303 (GND)
[ MAIN BOARD ] — COMPONENT SIDE —
IC501
CN702
CN704
RV601
R505
R504
— 28 —
SECTION 7
DIAGRAMS
7-1. CIRCUIT BOARDS LOCATION
LED board
DISPLAY board
AUDIO board
DISC SENSOR (S) board
TABLE SENSOR board
BD board
SW board
MOTOR board
DISC SENSOR (R) board
MAIN board
POWER SW board
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