SLV-GA30, SLV-GA50, SLV-GA66, SLV-GA70K, SLV-GA77K, SLV-GF80, SLV-GF90K, SLV-GF99K, SLV-P66, SLV-PH99 - Sony VCR Service Manual (repair manual). Page 4

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Step 1 Unpacking ······································································ 1-1
Step 2 Setting up the remote commander ·································· 1-1
Step 3 Connecting the unit ························································ 1-1
Step 4 Tuning your TV to the unit ············································· 1-2
Playing a tape ············································································ 1-2
Playing/searching at various speeds ·········································· 1-3
Karaoke sing-along ···································································· 1-4
Enjoying the surround sound (Virtual Surround)

(SLV-GF-99KME/PS only) ············································· 1-5

Adjusting the picture (Resolution Control) ······························· 1-5
Editing with another VCR ························································· 1-6
Synchronised recording ····························································· 1-6
Troubleshooting ········································································· 1-7
Index to parts and controls ························································ 1-7

2-1.

Upper Case, Panel Block Assembly ································ 2-1

2-2.

FR-140, 141, 142, JK-166, MJ-91 Boards ······················ 2-1

2-3.

Rear Panel ········································································ 2-2

2-4.

MA-336 Board ································································ 2-2

2-5.

Mechanism Deck ····························································· 2-3

2-6.

Internal Views ·································································· 2-4

2-7.

Circuit Boards Location ·················································· 2-5

3-1.

Overall Block Diagram ··················································· 3-1

3-2.

Video Block Diagram ······················································ 3-3

3-3.

Servo/System Control Block Diagram ···························· 3-5

3-4.

Audio Block Diagram ····················································· 3-7

3-5.

Karaoke Block Diagram ·················································· 3-9

3-6.

Power Supply Block Diagram ······································· 3-11

4-1.

Frame Schematic Diagram ·············································· 4-3

4-2.

Printed Wiring Boards and Schematic Diagrams ············ 4-5

• MA-336 (Video, Audio)(1/4) Schematic Diagram ······· 4-5
• MA-336 (Servo/System Control)(2/4)

Schematic Diagram ········································· 4-7

• MA-336 (HiFi, Tuner)(3/4) Schematic Diagram ·········· 4-9
• MA-336 (Karaoke, Power Supply)(4/4)

Schematic Diagram ······································· 4-11

• MA-336 (Video, Audio, Servo/System Control, Tuner,

Karaoke, Power Supply) Printed Wiring Board ·········· 4-13

• SR-35 (Surround) Printed Wiring Board ···················· 4-16
• SR-35 (Surround) Schematic Diagram ······················· 4-17
• FR-142 (Mode Control) Printed Wiring Board ··········· 4-19
• FR-142 (Mode Control) Schematic Diagram ············· 4-21
• FR-140 (Power, Eject Switches)

Printed Wiring Board and
Schematic Diagram ······································· 4-23

• FR-141 (Tape Operation)

Printed Wiring Board and
Schematic Diagram ······································· 4-24

• MJ-91 (MIC Jack, Amp)

Printed Wiring Board and
Schematic Diagram ······································· 4-25

• JK-166 (Line In/Out)

Printed Wiring Board and
Schematic Diagram ······································· 4-26

5-1.

System Control — Video Block Interface
(MA-336 Board IC201) ··················································· 5-1

5-2.

System Control — Servo Peripheral Circuit Interface
(MA-336 Board IC201) ··················································· 5-1

5-3.

System Control — Mechanism Interface
(MA-336 Board IC201) ··················································· 5-2

5-4.

System Control — Audio Block Interface
(MA-336 Board IC201) ··················································· 5-2

5-6.

Servo/System Control Microprocessor Pin Functions
(MA-336 Board IC201) ··················································· 5-3

6-1

Mechanical Adjustments ················································· 6-1

6-2.

Electrical Adjustments ····················································· 6-1

2-1.

Preparation before Adjustment ········································ 6-1

2-1-1. Equipment Required ························································ 6-1
2-1-2. Equipment Connection ···················································· 6-1
2-1-3. Set-up of Adjustment ······················································· 6-1
2-1-4. Alignment Tape ······························································· 6-1
2-1-5. Input/Output Levels and Impedance ······························· 6-2
2-1-6. Adjustment Sequence ······················································ 6-2
2-2.

POwer Supply Check ······················································ 6-2

2-2-1. Output Voltage Check (MA-336 Board) ························· 6-2
2-3.

Servo System Check ························································ 6-3

2-3-1. RF Switching Position Adjustment (MA-336 Board) ····· 6-3
2-4.

Audio System Adjustment ··············································· 6-3

2-4-1. Hi-Fi Audio System Adjustment (Hi-Fi model only) ······ 6-3
1.

AF Switching Position Adjustment (MA-336 Board) ····· 6-4

2-4-2. Normal Audio System Adjustment ·································· 6-4
1.

ACE Head Adjustment ···················································· 6-4

2.

E-E Output Level Check ················································· 6-4

3.

Recording Bias Check ····················································· 6-4

2-5.

Adjusting Parts Location Diagram ·································· 6-6

7-1.

Exploded Views ······························································· 7-1

7-1-1. Front Panel and Upper Case Section ······························· 7-1
7-1-2. Chassis Section ································································ 7-3
7-1-3. Mechanism Deck Section-1 ············································· 7-4
7-1-4. Mechanism Deck Section-2 ············································· 7-5
7-1-5. Mechanism Deck Section-3 ············································· 7-6
7-2.

Electrical Parts List ························································· 7-7