Electrical Block Checking - Sony CDP-XE530 Service Manual

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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 10MΩ 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.
S Curve Check (With general remote commander)
BD board
TP (FE)
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect the test point JW613 (ADJ) on MAIN board to the
ground with a lead wire.
3. Turn Power switch on.
Put disc (YEDS-18) in press · (play) button.
4.
When the !¡ button of the remote commander is pressed, the
5.
S curve will be output continuously.
6. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3
Vp-p.
S-curve waveform
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7. After check, remove the lead wire connected in step 2.
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.
S Curve Check (Without general remote commander)
BD board
TP (FE)
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Connect both ends of TP R151 of the BD board to the lead
wire.
4. Turn Power switch on.
5. Put disc (YEDS-18) in and actuate the focus search. (actuate
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the focus search when disc table is moving in and out.)
6. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3.8 ±
1 Vp-p.
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SECTION 5

ELECTRICAL BLOCK CHECKING

oscilloscope
symmetry
A
+ 1.5
Within 3 Vp-p
– 1
B
oscilloscope
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8
S-curve waveform
7. After check, remove the lead wire connected in step 2 and 3.
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
BD board
TP (RF)
TP (VC)
Procedure :
+ 1.5
– 1
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turn 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
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signal level is correct or not.
3 6 7 1 3
Note:
A clear RF signal waveform means that the shape "◊" can be clearly
distinguished at the center of the waveform.
RF signal waveform
E-F Balance (1 Track Jump) Check
(Without general remote commander)
BD board
TP (TE)
TP (VC)
Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
Press the P (Pause) button. (Becomes the 1 track jump mode)
4.
5. Check the level B of the oscilliscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
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Confirm the following :
A/B x 100 = less than ± 22%
.
— 10 —
2 9 9 4 2 8
symmetry
A
Within 3.8 ± 1.1 Vp-p
B
oscilloscope
1 5 0 5 8 2 9 9 4
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.2 ± 0.2 Vp-p
oscilloscope
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9 9
2 8 9 9