Diagrams; Circuit Boards Location - Sony CDP-CX50 Service Manual

QQ
3 7 6 3 1 5 1 5 0
oscilloscope
BD board
TP (TE)
TP (VC)
When a general remote commander is not used:
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
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%
Traverse waveform
Center of the waveform
B
0V
T E
L 1 3 9 4 2 2 9 6 5 1 3
level : 0.7 ± 0.3 Vp-p
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.
Traverse waveform
0V
Tracking servo Tracking servo
OFF ON
11. Turn OFF the power, and remove the lead wire connected at
step 1.
RF PLL Free-run Frequency Check
Procedure :
1. Connect the frequency counter to TP (PLCK) of the BD board.
frequency counter
BD board
www
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
kHz.
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About RV502 on the AUDIO board
RV502 of the AUDIO board requires no adjustments. Please note
that it should be dixed to mechanical center position when you
moved and do not know origin position.
Adjustment Location :
[ BD BOARD ] — CONDUCTOR SIDE —
IC102
(PLCK)
(DVDD)
TP
(RF)
(FE)
IC101
TP
(VC)
A (DC voltage)
TP
(TE)
[ DISPLAY BOARD ] — CONDUCTOR SIDE —
CNP801
IC801
C (DC
CNP804
voltage)
TP301
(ADJ)
[ AUDIO BOARD ] — COMPONENT SIDE —
CN501
CN801
CN811
RV502
(No Adjustment)
x a o
y
IC601
i
— 19 —
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8

7-1. CIRCUIT BOARDS LOCATION

CN102
TP
POWER SW board
CN103
TP CN101
TP
Q Q
3 7 6 3 1
DISC SENSOR (R) board
T501
u 1 6 3
.
SECTION 7
2 4
9 9 8

DIAGRAMS

LED board
DISPLAY board
5 1 5 0 8 9 2 4
DISC SENSOR (S) board
TABLE SENSOR board
m
c o
MOTOR board
— 20 —
2
9 9
AUDIO board
9 8 2 9 9
BD board
SW board