SLV-7700KML - Sony VCR Service Manual (repair manual). Page 4

— 4 —

•  MB-77 (Karaoke DSP, Audio I/O)

Printed Wiring Board (Side B) ······················ 5-33

•  MB-77 (Karaoke DSP)

Schematic Diagram (1/4) ······························ 5-35

•  MB-77 (Audio I/O)

Schematic Diagram (2/4) ······························ 5-37

•  MB-77 (Surround Processor)

Schematic Diagram (3/4) ······························ 5-39

•  MB-77 (Video Select)

Schematic Diagram (4/4) ······························ 5-41

•  HI-66 (Display/Function Control)

Schematic Diagram ······································· 5-43

•  HI-66 (Display/Function Control)

Printed Wiring Board ···································· 5-45

•  SW-323 (Function Switch)

Printed Wiring Board ···································· 5-47

•  SW-323 (Function Switch)

Schematic Diagram ······································· 5-48

•  MJ-92 (MIC AMP)

Printed Wiring Board ···································· 5-49

•  MJ-92 (MIC AMP)

Schematic Diagram ······································· 5-50

•  IO-65 (Front Jack)

Schematic Diagram ······································· 5-51

•  IO-65 (Front Jack)

Printed Wiring Board ···································· 5-53

•  TU-168 (Tuner)

Schematic Diagram ······································· 5-55

•  TU-168 (Tuner)

Printed Wiring Board ···································· 5-57

•  PS-418 (Power Supply)

Schematic Diagram ······································· 5-59

•  PS-418 (Power Supply)

Printed Wiring Board ···································· 5-61

•  Waveforms ································································· 5-63

6-1.

System Control -Video Block Interface ·························· 6-1

6-2.

System Control -Servo Peripheral Circuit Interface ········ 6-2

6-3.

System Control -Mechanism Interface ···························· 6-3

6-4.

System Control -System Control
Peripheral Circuit Interface ············································· 6-4

6-5.

System Control -Hi-Fi Audio Block Interface ················ 6-4

6-6.

System Control -Normal Audio Block Interface ············· 6-4

6-7.

AV Control -Input Selection Block Interface ·················· 6-5

6-8.

Servo/System Control Microprocessor
Port Function Description ··············································· 6-6

6-9.

Display/Function Control Microprocessor
Port Function Description ··············································· 6-7

6-10. Video-CD Mechanism Control Microprocessor

Port Function Description ··············································· 6-8

6-11. MPEG Decoder Port Function Description ··················· 6-10
6-12. Video Encoder Port Function Description ····················· 6-12
6-13. Karaoke/Digital Sound Processor

Port Function Description ············································· 6-14

7-1.    MECHANICAL ADJUSTMENTS ································· 7-1
7-2.    ELECTRICAL ADJUSTMENTS ··································· 7-1
2-1.

Preparation Before Adjustment ······································· 7-1

2-1-1. Equipment Required ························································ 7-1
2-1-2. Equipment Connection ···················································· 7-1
2-1-3. Check of Input Signal ······················································ 7-1
2-1-4. Alignment Tape ······························································· 7-2
2-1-5. Specified Input -Output Level and the Impedance ·········· 7-2
2-1-6. Adjustment Procedures ···················································· 7-2
2-2.

Video-CD Color-Bars Mode ············································ 7-2

2-3.

Power Supply Check ······················································· 7-3

2-3-1. Output Voltage Check ······················································ 7-3
2-4.

Video-CD System Adjustments ······································· 7-3

2-4-1. S-Curve Check ································································ 7-3
2-4-2. RF Level Check ······························································· 7-4
2-4-3. E-F Balance (Traverse) Check ········································ 7-4
2-4-4. RF PLL Free-run Frequency Check ································ 7-5
2-4-5. Clock Adjustment ···························································· 7-5
2-5.

Servo System Adjustment ··············································· 7-5

2-5-1. RF Switching Position Adjustment ································· 7-5
2-6.

Video System Adjustments ·············································· 7-6

2-6-1. X'tal OSC Check ····························································· 7-6
2-6-2. SYNC AGC Check ·························································· 7-6
2-6-3. White Clip/Dark Clip Check ··········································· 7-6
2-6-4. REC Y Level Check ························································ 7-7
2-6-5. REC Chrome Level Check ·············································· 7-7
2-6-6. Playback Level Check ····················································· 7-7
2-6-7. VCO Frequency Adjustment ··········································· 7-7
2-7.

Audio System Adjustments ············································· 7-8

2-7-1. AF Switching Position Adjustment ································· 7-8
2-7-2. VCO f

0

 Adjustment ·························································· 7-9

2-7-3. Deviation Check ······························································ 7-9
2-7-4. Band Pass Filter f

0

 Adjustment ········································ 7-9

2-7-5. ACE Head Adjustment ·················································· 7-10
2-7-6. Recording Bias Check ··················································· 7-10
2-7-7. E-E Output Level Check ··············································· 7-10
2-7-8. Overall Output Level and Distortion Factor Check ······· 7-10
2-7-9. Overall Noise Level Check ············································ 7-10
2-8.

Adjustment Parts Location Diagrams ···························· 7-11

8-1.

EXPLODED VIEWS ······················································ 8-1

8-1-1. Case Assembly ································································ 8-1
8-1-2. Front Panel Assembly ······················································ 8-2
8-1-3. Chassis Assembly ···························································· 8-3
8-1-4. VCD Mechanical Deck Assembly (CDM14-5BD21) ····· 8-4
8-1-5. Optical Pick-up Assembly (BU-5BD21) ························· 8-5
8-1-6. VHS Mechanical Deck Assembly (1) ····························· 8-6
8-1-7. VHS Mechanical Deck Assembly (2) ····························· 8-7
8-1-8. VHS Mechanical Deck Assembly (3) ····························· 8-8
8-1-9. VHS Mechanical Deck Assembly (4) ····························· 8-9
8-2.

ELECTRICAL PARTS LIST ········································ 8-10