— 19 —
— 20 —
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
7-1. CIRCUIT BOARDS LOCATION
SECTION 7
DIAGRAMS
POWER SW board
LED board
DISPLAY board
AUDIO board
DISC SENSOR (S) board
TABLE SENSOR board
BD board
SW board
MOTOR board
DISC SENSOR (R) board
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.
Traverse waveform
11. Turn OFF the power, and remove the lead wire connected at
RF PLL Free-run Frequency Check
Procedure :
1. Connect the frequency counter to TP (PLCK) of the BD board.
B
Center of the waveform
level : 0.7 ± 0.3 Vp-p
C (DC
voltage)
ON
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.
Adjustment Location :
[ BD BOARD ] — CONDUCTOR SIDE —
IC102
IC101
TP
(VC)
TP
(TE)
TP
(FE)
TP
(RF)
TP
(PLCK)
CN101
CN102
CN103
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.
TP
(DVDD)
[ DISPLAY BOARD ] — CONDUCTOR SIDE —
CNP804
IC801
TP301
(ADJ)
CNP801
[ AUDIO BOARD ] — COMPONENT SIDE —
RV502
(No Adjustment)
IC601
CN501
CN801
CN811
T501
0V
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