Electrical Adjustments - Sony CDP-XA30ES Service Manual

SECTION 5

ELECTRICAL ADJUSTMENTS

Notes:
1. CD block basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
3. Use the oscilloscope with more than 10 MΩ impedance.
4. Clean an 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
Connection:
oscilloscope
BD board
TP2 (FE) +
TP (VC)
–
Procedure:
1. Connect the oscilloscope to TP2 (FE) and TP (VC) on BD
board.
2. Connect the TP3 (FEI: IC101 pin @ª) and TP (VC) with lead
wire.
3. Turned power switch on.
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. Confirm that the oscilloscope waveform (S-curve) is symmetri-
cal between A and B. And confirm peak to peak level within
3.0 ± 1.0 Vp-p.
S-curve waveform
symmetry
A
within 3.0 ± 1.0 Vp-p
B
6. After check, remove the lead wire connected in step 2.
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
brightness to obtain best waveform.
RF Level Check
Connection:
oscilloscope
(AC range)
BD board
TP1 (RF)
+
TP (VC)
–
Procedure:
1. Connect the oscilloscope to TP1 (RF) and TP (VC) on BD
board.
2. Turned power switch on. (stop mode)
3. Put disc (YEDS-18) in and press the ( button.
4. Confirm that the oscilloscope waveform is clear and check RF
signal level is correct or not.
Note: 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
(with the 10: 1 probe
in use)
+0.25
level: 1.2
–0.20
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
E-F Balance (Traverse) Check
Connection:
oscilloscope
(DC range)
BD board
TP4 (TE)
+
TP (VC)
–
Procedure:
1. Connect the TP18 (ADJ) to ground and TP5 (TEI: IC101 pin
@¶) to TP (VC)with lead wire.
2. Connect the oscilloscope to TP4 (TE) and TP (VC) on BD
board.
3. Turned power switch on.
4. Put disc (YEDS-18) in and press the ( button.
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to A Vdc, and check this level.
Traverse waveform
A
B
Symmetry
A/B × 100 is ± 20 % or less.
level: 1.3 ± 0.7 Vp-p
6. After check, remove the lead wire connected in step 1.
RF PLL Free-run Frequency Check
Connection:
frequency counter
BD board
+
TP13 (XPLCK)
–
Procedure:
1. Connect the frequency counter to TP13 (XPLCK).
2. Turned power switch on.
3. Put disc (YEDS-18) in and press the ( button.
4. Confirm that the reading on frequency counter is 4.3218 MHz.
– 21 –
Connecting Location:
[BD BOARD] (SIDE B)
TP18
Vp-p
(ADJ)
TP13
(XPLCK)
CN107
IC102
CN101
IC104
TP1
(RF)
TP (VC)
TP4
TP3 (FEI)
(TE)
TP2 (FE)
TP5
(TEI)
IC361
– 22 –