Diagrams - Sony CDP-M11C Service Manual

5. Confirm that the oscilloscope waveform (S-curve) is symmetri-
cal between A and B. And confirm peak to peak level within
2.4 ± 0.7 Vp-p.
S-curve waveform
symmetry
A
within 2.4 ± 0.7 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
BD board
TP (RF)
+
TP (VC)
–
Procedure:
1. Connect the oscilloscope to TP (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 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)
level: 1.3 ± 0.3 Vp-p
E-F Balance (Traverse) Check
Connection:
oscilloscope
(DC range)
BD board
TP (TEO) +
TP (VC)
–
Procedure:
1. Connect the TP (TEST) and TP (GND) with lead wire. (Test
mode)
2. Connect the oscilloscope to TP (TEO) and TP (VC) on BD
board.
3. Turned power switch on.
4. Put disc (YEDS-18) in and press the ^ button.
5. Press the 6 OPEN/CLOSE 2 button. (Tracking servo and
sled servo are turned off.)
6. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0 Vdc, and check this level.
Traverse waveform
A
B
level: 300 ± 100 mVp-p
7. After check, remove the lead wire connected in step 1.
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off. There is no
problem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
Adjustment Location :
[BD BOARD] – Side B –
IC102
FOK
TEI
FEI
RV102
RF IC101
FEO
VC
RV101
IC104
TEO
RV103
[MAIN BOARD] – Component Side –
IC103
TP TP
(GND) (TEST)
– 13 –
• Circuit Boards Location
PANEL (UPPER) board
GND
PANEL (LOWER) board
GEAR SELECT board
MOTOR DRIVE board
SECTION 6

DIAGRAMS

LIGHT CONNECTOR board
MAIN board
POWER board
TRAY ADDRESS board
CHUCKING SW board
BD board
PHOTO SENSOR board
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