Sony CDP-CX355 Service Manual ▷ View online
26
CDP-CX355
SECTION 6
ADJUSTMENTS
6-1. Mechanical Adjustments
Pop Up Mechanism Adjustment
1.
1.
With the power ON, while pressing the GROUP 4 and
·
buttons, press the +100 button to enter the mechanism
adjustment mode.
adjustment mode.
2.
Press the GROUP 1 button to operate the loading mechanism,
and continue pressing until the disc table locks. (Fig-1)
and continue pressing until the disc table locks. (Fig-1)
3.
Press the GROUP 2 button to raise the pop up part.
4.
Remove the cover (chassis), loosen the adjusting screw, move
the screwdriver left and right until the lever (POP UP) does not
touch the slit wall, and secure the screw. (Fig-2)
the screwdriver left and right until the lever (POP UP) does not
touch the slit wall, and secure the screw. (Fig-2)
The following buttons have special functions in this mode.
GROUP 1 button: Loading mechanism IN operation
GROUP 5 button: Loading mechanism OUT operation
GROUP 2 button: Pop up part UP operation
GROUP 6 button: Pop up part DOWN operation
GROUP 5 button: Loading mechanism OUT operation
GROUP 2 button: Pop up part UP operation
GROUP 6 button: Pop up part DOWN operation
Lever (pop up)
Fix to the center so that the
lever (POP UP) does not
touch the slit.
lever (POP UP) does not
touch the slit.
Cover (chassis)
FIg-1
FIg-2
GROUP1
GROUP2
GROUP2
GROUP4
At this position,this
part will be locked.
part will be locked.
27
CDP-CX355
GROUP1
GROUP4
PAUSE button
PLAY button
Fixed screws
Swing
Holder (table sensor)
Table assembly
At this position,this
part will be locked.
part will be locked.
Sensor Adjustment
1.
1.
With the power ON, while pressing the GROUP 4 and
·
buttons, press the +100 button to enter the mechanism
adjustment mode.
adjustment mode.
2.
Press the GROUP 1 button to operate the loading mechanism,
and continue pressing until the disc table locks. (Fig-3)
and continue pressing until the disc table locks. (Fig-3)
3.
Loosen the fixing screw, move the holder (TABLE SENSOR)
slightly, and when the LED (green) of the PLAY button
switches to the LED (orange) of the PAUSE button (or vice
versa), secure the holder (TABLE SENSOR). (Fig-4)
slightly, and when the LED (green) of the PLAY button
switches to the LED (orange) of the PAUSE button (or vice
versa), secure the holder (TABLE SENSOR). (Fig-4)
4.
Moving the disc table right and left with a hand after the screw
is fixed, the table will move by the play of a disc table. If the
LEDs light up alternately, the adjustment will be performed
correctly. (Fig-4)
is fixed, the table will move by the play of a disc table. If the
LEDs light up alternately, the adjustment will be performed
correctly. (Fig-4)
FIg-3
FIg-4
PLAY indicator
Linked with
· indicator
Linked with
P indicator
PAUSE indicator
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)
29
CDP-CX355
1.
Connect the oscilloscope to Pins 1, 2, and 3 of CN506 of
the MAIN board.
the MAIN board.
2.
Check that no discs are loaded in the unit.
3.
With the power ON, while pressing the GROUP 5 and
§ OPEN/CLOSE buttons, press the +100 button. The disc
table starts to rotate in the clockwise direction.
§ OPEN/CLOSE buttons, press the +100 button. The disc
table starts to rotate in the clockwise direction.
4.
Loosen the fixing screw, move the mounting board (SENSOR),
and secure the mounting board (SENSOR) at the point the H
portion of the P.T waveform comes the center of the H portion
of the D.S waveform.
and secure the mounting board (SENSOR) at the point the H
portion of the P.T waveform comes the center of the H portion
of the D.S waveform.
Disc Sensor Adjustment
Be sure to perform this adjustment after sensor adjustment in
MECHANICAL ADJUSTMENT.
Be sure to perform this adjustment after sensor adjustment in
MECHANICAL ADJUSTMENT.
Connection:
Waveform:
5.
Rotate the DISC/CHARACTER knob in the counterclockwise
direction and the disc table starts to rotate in the same direction.
Check that the waveform at this time is the same as that in step
4. If larger by a considerable extent, rotate the DISC/
CHARACTER knob in the clockwise direction and the disc
table starts to rotate in the same direction. Repeat from step 4.
direction and the disc table starts to rotate in the same direction.
Check that the waveform at this time is the same as that in step
4. If larger by a considerable extent, rotate the DISC/
CHARACTER knob in the clockwise direction and the disc
table starts to rotate in the same direction. Repeat from step 4.
6.
Rotate RV501 of the MAIN board and adjust so that the H and
L portions of the D.S waveform become the same.
L portions of the D.S waveform become the same.
Fixing screw
Mounting board (SENSOR)
D.S: Pin 1
GND: Pin 2
T.P: Pin 3
oscilloscope
CH1 CH2
D.S
GND
T.P
GND
T.P
MAIN board
CN506
D.S
P.T
D.S
P.T
Should be at the center
D.S
Adjust so that these widths
become the same.
become the same.
Adjustment Location: MAIN board (See page 30)
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