Check - Sony HCD-F250AV Service Manual

Q Q
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.
Press the 1/u button to turn ON the power.
3.
4. Open the front cover, and press the CD 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
A (DC voltage)
0V
level : 0.7 ± 0.3 Vp-p
T E
L 1 3 9 4 2 2 9 6 5 1 3
10. Disconnect the lead wire short-circuited at step 8. (The tracking
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
TP (PLCK)
w w w
Press the 1/u button to turn ON the power.
2.
3. Open the front cover, and press the CD 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.
http://www.xiaoyu163.com
Adjustment Location :
[ BD BOARD ] — CONDUCTOR SIDE —
IC102
TP
(PLCK)
TP
TP
(DVDD)
TP (TOFF)
(RF)
TP
(FE)
IC101
TP
(VC)
TP
(TE)
[ MAIN BOARD ] — COMPONENT SIDE —
CN301
RV301
IC301
RV351
CN107
C (DC
voltage)
x a o u 1 6 3
y
i
— 25 —
http://www.xiaoyu163.com
8
CN102
CN103
CN101
Q Q
CN302
3 7 6 3 1
CN106
c o
.
2 4
9 9 8
5 1 5 0 8 9 2 4 9
m
HCD-F250AV
2
9 9
8 2 9 9