Read Sony CDP-XE330 Service Manual online
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SECTION 5
ELECTRICAL BLOCK CHECKING
Note:
1.
CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
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
following checks.
when the signal level is low than specified value with the
following checks.
S Curve Check
Procedure :
1.
1.
Connect oscilloscope to test point TP (FEO) on BD board.
2.
Connect between test point TP (FOK) and ground by lead wire.
3.
Turn Power switch on.
4.
Put disc (YEDS-18) in and turn Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
5.
Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3±1
Vp-p.
between A and B. And confirm peak to peak level within 3±1
Vp-p.
S-curve waveform
6.
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
• 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
Procedure :
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
signal level is correct or not.
signal level is correct or not.
Note:
A clear RF signal waveform means that the shape “
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 remote commander)
(Without remote commander)
Procedure :
1.
1.
Connect oscilloscpe to test point TP (TEO) on BD board.
2.
Turn 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 oscilliscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 7%
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 7%
1 track jump waveform
E-F Balance Check (With remote commander)
Procedure :
1.
1.
Connect the test point TP3 (ADJ) on MAIN board to the ground
with a lead wire on main board.
with a lead wire on main board.
2.
Connect oscilloscpe to test point TP (TEO) on BD board.
3.
Turn the Power switch on to set the ADJ mode.
4.
Put disc (YEDS-18) in to play the number five track.
5.
Press the “3” button. (The tracking servo is turned OFF.)
oscilloscope
BD board
TP (FEO)
TP (VC)
TP (VC)
symmetry
A
B
Within 3
±
1 Vp-p
oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.3
±
0.3 Vp-p
oscilloscope
BD board
TP (TEO)
TP (VC)
TP (VC)
0V
level : 500
±
100 mVp-p
A (DC voltage)
Center of the waveform
B
symmetry
oscilloscope
BD board
TP (TEO)
TP (VC)
TP (VC)
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