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CD SECTION
Note :
1.
CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10 MW impedance.
4.
Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
oscilloscope
BD board
TP (FE)
TP (VC)
S Curve Check
Procedure :
1.
Connect the oscilloscope to TP (FE) of the BD board.
Press the @/1 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.
The first track will be played back automatically.
7.
Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 1.8 ±
0.6 Vp-p.
S-curve waveform
symmetry
A
within 1.8 ± 0.6Vp-p
B
8.
Turn OFF the power.
Note : • Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF Level Check
oscilloscope
BD board
TP (RF)
TP (VC)
Procedure :
1.
Connect the oscilloscope to TP (RF) of the BD board.
2.
Press the @/1 button to turn ON the power.
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 oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
8.
Turn OFF the power.
Note : A clear RF signal waveform means that the shape "◊" can be
clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
+0.3
level : 1.8 ±
Vp-p
–0.2
E-F Balance (Traverse) Check
The procedure for this checking method differs for when a general
remote control unit is used and not used.
oscilloscope
BD board
TP (TE)
TP (VC)
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
@/1
button to turn ON the power.
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 × 100 = less than ± 10%
Traverse waveform
Center of the waveform
B
A (DC voltage)
0V
level : 0.7 ± 0.3 Vp-p
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)
2.
Press the
@/1
button to turn ON the power.
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.
Adjustment Location :
[ BD BOARD ] — CONDUCTOR SIDE —
IC102
TP
(DVDD)
TP
(TOFF)
(RF)
IC101
TP
(VC)
TP
(TE)
[ MAIN BOARD ] — COMPONENT SIDE —
CN301B
C (DC
voltage)
CN402
CN401
2
8
2
16
1
9
1
15
23
23
CN102
TP
CN103
(PLCK)
TP
CN101
TP
(FE)
IC501
11
1
12
2
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