Read Sony CDP-M11C / CMT-M11C Service Manual online
A
B
+
–
–
BD board
TP (TEO)
TP (VC)
oscilloscope
(DC range)
+
–
–
BD board
TP (RF)
TP (VC)
oscilloscope
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.
2.4 ± 0.7 Vp-p.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Note:
Note:
•
Try to measure several times to make sure that the ratio
of A : B or B : A is more than 10 : 7.
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.
brightness to obtain best waveform.
RF Level Check
Connection:
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
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
E-F Balance (Traverse) Check
Connection:
Procedure:
1. Connect the TP (TEST) and TP (GND) with lead wire. (Test
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
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
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.
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 –
A
B
symmetry
within 2.4 ± 0.7 Vp-p
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10 : 1 probe
in use)
TIME/DIV: 500 ns
(with the 10 : 1 probe
in use)
level: 1.3 ± 0.3 Vp-p
level: 300 ± 100 mVp-p
IC104
IC102
IC101
FEI
TEI
GND
FOK
RF
RV101
RV103
TEO
FEO
VC
RV102
[MAIN BOARD] – Component Side –
– 13 –
TP
(GND)
TP
(TEST)
IC103
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