Read Sony CDP-CX355 Service Manual online
28
CDP-CX355
6-2. Electrical Adjustment
Note:
1.
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.
Chuck the disc (YEDS-18) beforehand, and disconnect the
power cord from the outlet.
power cord from the outlet.
2.
Connect oscilloscope to test point TP (FE1) on BD board.
3.
Connect test point TP (ADJ) on MAIN board to ground with
lead wire.
lead wire.
4.
The ADJ mode is set when the power cord is inserted into the
outlet and power is supplied.
outlet and power is supplied.
5.
The fifth track is played automatically.
6.
Press the CHECK button.
7.
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
8.
Pressing the
1/u button stops the output of the waveform (s
curve).
9.
After check, remove the lead wire connected in step 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.
Adjustment Location: BD board (See page 30)
RF Level Check
Note: A clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
RF signal waveform
Adjustment Location: BD board (See page 30)
E-F Balance Check
Procedure :
1.
1.
Chuck the disc (YEDS-18) beforehand, and disconnect the
power cord from the outlet.
power cord from the outlet.
2.
Connect oscilloscpe to test point TP (TE1) on BD board.
3.
Connect test point TP (ADJ) on MAIN board to ground with
lead wire.
lead wire.
4.
The ADJ mode is set when the power cord is inserted into the
outlet and power is supplied.
outlet and power is supplied.
5.
The fifth track is played automatically.
6.
Press the GROUP 3 button. (The tracking servo and the
sledding servo are turned OFF.) “ TRK Off ” is displayed.
sledding servo are turned OFF.) “ TRK Off ” is displayed.
7.
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 ± 22%
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Traverse waveform
8.
Press the GROUP 8 button. (The tracking servo and sledding
servo are turned ON.) “ TRK On ” is displayed. Confirm the C
(DC voltage) is almost equal to the A (DC voltage) is step 7.
servo are turned ON.) “ TRK On ” is displayed. Confirm the C
(DC voltage) is almost equal to the A (DC voltage) is step 7.
Traverse waveform
Procedure :
1.
1.
Connect oscilloscope to test point TP (RFAC) 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.
oscilloscope
BD board
TP (FE1)
TP (VC)
TP (VC)
symmetry
A
B
Within 3
±
1 Vp-p
VOLT/DIV : 1V
TIME/DIV : 400
TIME/DIV : 400
µ
s
oscilloscope
BD board
TP (RFAC)
TP (VC)
TP (VC)
VOLT/DIV : 500mV
TIME/DIV : 1
TIME/DIV : 1
µ
s
level : 1.2 Vp-p
+0.25
–0.20
–0.20
oscilloscope
BD board
TP (TE1)
TP (VC)
TP (VC)
0V
level : 1.3
±
0.6 mVp-p
A (DC voltage)
Center of the waveform
B
0V
C (DC
voltage)
voltage)
Tracking servo
Sledding servo
OFF
Sledding servo
OFF
Tracking servo
Sledding servo
ON
Sledding servo
ON
9.
After check, disconnect the lead wire of TP (ADJ) connected
in step 3.
in step 3.
Adjustment Location: MAIN board (See page 30)
Click on the first or last page to see other CDP-CX355 service manuals if exist.