Sony CDP-D500, Service Manual

Page: 16 / 59

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SECTION 5
ELECTRICAL ADJUSTMENTS
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 10M
Ω
impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
S-Curve Check
Note:
•
Try to measure several times to make sure that the ratio of
A:B or B:A is more than 10:7.
•
Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
RF Level Check
Procedure:
1. Connect the test point TP (ADJ) on MAIN board to the ground
with a lead wire on MAIN board.
2. Connect oscilloscope to test point TP (FE) on BSL board.
3. Turned Power switch on to set ADJ mode by TIMER SW OFF.
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
5. TIMER SW ON.
6. Press the “1” button (s-cuve observe mode).
7. Check the oscilloscope waveform (S-curve) is symmetrical be-
tween A and B. And confirm peak to peak level within 3 ± 1 Vp-p.
S-curve waveform
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: 200 mV
TIME/DIV: 500 ns
level: 1.2 Vp-p
+0.25
–0.20
E-F Balance (1 Track Jump) Check
E-F Balance Check
+
–
BSL board
TP (FE)
TP (VC)
oscilloscope
Procedure:
1. Connect oscilloscope to test point TP (RF) on BSL board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
+
–
BSL board
TP (RF)
TP (VC)
oscilloscope
+
–
BSL board
TP (TE)
TP (VC)
oscilloscope
Procedure:
1. Connect the test point TP (ADJ) on MAIN board on the ground
with a lead wire on MAIN board.
2. Connect oscilloscope to test point TP (TE) on BSL board.
3. Turn the Power switch on to set the ADJ mode. (TIMER SW
OFF)
4. Put disc (YEDS-18) in to play the number five track.
5. Press the “3” button. (The tracking servo and the sledding servo
are turned OFF.)
Procedure:
1. Connect oscilloscope to test point TP (TE) on BSL board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “
P (Pause)” button. (Becomes the 1 track jump mode)
5. Check the level B of the oscilloscope’s waveform and the A
(DC voltage) of the center of the Travers waveform.
Confirm the following :
A/B
×
100 = less than ± 6 (%)
1 track jump waveform
+
–
BSL board
TP (TE)
TP (VC)
oscilloscope
A
B
symmetry
within 3
±
1 Vp-p
Center of the waveform
B
level : 1.5 Vp-p symmetry
A (DC voltage)
0V
+1.5
–0.5
www.freeservicemanuals.info 6/8/15
Also made in Heiloo, Holland.