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- SERVICING NOTE
- GENERAL
- DISASSEMBLY
- Loading Panel
- Front Panel
- TC Mechanism Deck
- CD SW Board, Panel Board
- Disc Tray
- MECHANICAL ADJUSTMENTS
- ELECTRICAL ADJUSTMENTS
- DIAGRAMS
- Circuit Boards Location
- Block Diagrams
- Tuner Section
- Deck Section
- CD Section
- Main Section
- Printed Wiring Board —Tuner Section
- Schematic Diagram — Tuner Section
- Printed Wiring Board — Main Section
- Schematic Diagram — Main Section
- Schematic Diagram — Deck Section
- Printed Wiring Board — CD Motor Section
- Schematic Diagram — CD Motor Section
- Schematic Diagram — CD Section
- Printed Wiring Board — CD Section
- Printed Wiring Board — Panel Section
- Schematic Diagram — Panel Section
- IC Pin Functions
- IC Block Diagrams
- EXPLODED VIEWS
- Case Section
- Front Panel Section 1
- Front Panel Section 2
- Back Panel Section
- CD Mechanism Section 1 (CDM38 - 5BD19)
- CD Mechanism Section 2 (CDM38 - 5BD19)
- Base Unit Section (BU - 5BD19)
- TC Mechanism Section 1 (TCM - YSW47C24)
- TC Mechanism Section 2 (TCM - YSW47C24)
- TC Mechanism Section 3 (TCM - YSW47C24)
- ELECTRICAL PARTS LIST
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CD SECTION
Note: 1. CD Block is 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 10M� 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. 5. Adjust the focus bias adjustment when optical block is replaced. Focus Bias Adjustment
oscilloscope BD board TP (RF) TP (VC)
S Curve Check
oscilloscope BD board TP (FEO) TP (VC)
Procedure : 1. Connect oscilloscope to test point TP (FEO). 2. Connect between test point TP (FOK) and Ground by lead wire. 3. Turn Power switch on. 4. Put disc (YEDS-18) in and turned Power switch on again and actuate the focus search. (actuate the focus search when disc table is moving in and out.) 5. Check the oscilloscope 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
Procedure: 1. Connect oscilloscope to test point TP (RF). 2. Turned 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.) 5. After adjustment, check the RF signal level. � RF signal VOLT/DIV: 200 mV TIME/DIV: 500 nS
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 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
level: 1.3 ± 0.3 Vp-p oscilloscope BD board TP (RF) TP (VC)
Procedure : 1. Connect oscilloscope to test point TP (RF) on BD board. 2. Turned 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. RF signal waveform
VOLT/DIV: 200 mV TIME/DIV: 500 nS
level: 1.3 ± 0.3 Vp-p
� 14 �
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