Sony CDP-CX57 Service Manual page 18

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 I/
button and turn ON the power supply.
u
4. Open the front cover, and press the
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
0 V
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
0 V
Tracking servo
OFF
11. Turn OFF the power, and remove the lead wire connected at
step 1.
[PLUS ONE]
button.
Center of the
waveform
B
A (DC voltage)
level: 1.3 0.5 Vp-p
C (DC
voltage)
Tracking servo
ON
– 18 –
RF PLL Free-run Frequency Check
Procedure :
1. Connect the frequency counter to TP (PCK) of the BD board.
BD board
TP (PCK)
2. Press the I/ button and turn ON the power supply.
u
3. Open the front cover, and press the
4. Set the disc (YEDS-18) into the "PLUS ONE" slit.
5. Close the front cover, and chuck the disc.
6. Playback th e 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.
frequency counter
[PLUS ONE]
button.