Sony HCD-F50 Service Manual page 43

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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 to turn ON the power.
4. Open the front cover, and press the CD PLUS1 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
0V
TE
L 13942296513
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
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.
BD board
TP (PLCK)
www
2. Press the POWER button to turn ON the power.
3. Open the front cover, and press the CD PLUS1 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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oscilloscope
Center of the waveform
B
A (DC voltage)
level : 0.7 ± 0.3 Vp-p
Tracking servo Tracking servo
ON
OFF
frequency counter
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8
About RV402 on the MAIN board
RV402 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.
Adjustment Location :
[ BD BOARD ] — CONDUCTOR SIDE —
TP
(VC)
Q Q
3 6 7 1 3 1 5
[ MAIN BOARD ] — COMPONENT SIDE —
C (DC
voltage)
D901
IC461
CN404
CN402 CN401
RV402
co
.
– 43 –
9 4 2 8
IC102
TP
(PLCK)
TP CN101
TP
(DVDD)
(TOFF)
TP
(RF)
TP
(FE)
IC101
TP
(TE)
0 5 8 2 9 9 4 2 8
m
9 9
CN102
CN103
9 9