Read Sony CDP-EX100 / MHC-EX100AV / MHC-EX50 / MHC-EX70AV / MHC-EX90 Service Manual online
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Note :
1. Basically designed to operate without adjustment. 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 10MΩ impedance.
4. Clean the objective lens by an applicator with neutral detergent
3. Use an oscilloscope with more than 10MΩ impedance.
4. Clean the objective lens by an applicator with neutral detergent
when the signal level is low than specified value with the following
checks.
checks.
5. Adjust the focus bias adjustment when optical block is replaced.
Focus Bias Adjustment
SECTION 4
ELECTRICAL ADJUSTMENTS
Procedure:
1. Connect oscilloscope to test point TP (RF). (GND terminal : VC)
2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
1. Connect oscilloscope to test point TP (RF). (GND terminal : VC)
2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
(Clear RF signal waveform means that the shape “ ≈ ” can be
clearly distinguished at the center of the waveform.)
clearly distinguished at the center of the waveform.)
5. After adjustment, check the RF signal level.
• RF signal
VOLT/DIV : 200 mV
TIME/DIV : 500 nS
TIME/DIV : 500 nS
S Curve Check
Procedure:
1. Connect oscilloscope to test point TP(FEO).
2. Connect between test point TP(FOK)and GND by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turnd Power switch on again and
1. Connect oscilloscope to test point TP(FEO).
2. Connect between test point TP(FOK)and GND by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turnd Power switch on again and
actuate the focus search. (In case of using SERVICE BOX actuate
the focus search when disc table is moving in and out.)
the focus search when disc table is moving in and out.)
5. Check the oscillosope waveform (S-curve) is symmetrical between
A and B. And confirm peak to peak level within 2.4±0.7 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 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. Connect oscilloscope to test point TP (RF) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
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.
distinguished at the center of the waveform.
RF signal waveform
BD board
oscilloscope
TP (FEO)
TP (FOK)
TP (FOK)
VOLT/DIV : 200mV
TIME/DIV : 500nS
TIME/DIV : 500nS
level : 1.3±0.3 Vp-p
BD board
TP (RF)
TP (VC)
TP (VC)
oscilloscope
BD board
TP (RF)
VC
oscilloscope
(DC range)
(DC range)
level
1.3±0.3 Vp-p
1.3±0.3 Vp-p
symmetry
within 2.4±0.7 Vp-p
A
B
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