GV-A500 - Sony VCR Service Manual (repair manual). Page 4

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5-3.

VIDEO SECTION ADJUSTMENTS ·························· 5-12

3-1.

PREPARATIONS BEFORE ADJUSTMENT ·············· 5-12

3-1-1. Equipments to be Used ················································· 5-12
3-1-2. Precautions in Adjustment ············································ 5-13
3-1-3. Connector for Adjustments ··········································· 5-13
3-1-4. Connecting the Equipments ·········································· 5-14
3-1-5. Checking the Input Signals ··········································· 5-15
1.

S VIDEO input ····························································· 5-15

2.

VIDEO input ································································ 5-15

3-1-6. Alignment Tape ···························································· 5-16
3-1-7. Input/Output Level and Impedance ······························ 5-18
3-1-8. Recording Mode (Standard 8/Hi8) switching ·············· 5-18
3-1-9. Service Mode ································································ 5-18
1.

Test mode setting ·························································· 5-18

2.

Emergency Memory Address ······································· 5-19

2-1.

EMG CODE (Emergency Code) ·································· 5-19

2-2.

MSW Codes ································································· 5-20

3.

Bit value discrimination ··············································· 5-21

4.

Input/output selection check ········································· 5-21

5.

Condensation, head clogging check ····························· 5-22

6.

VTR state check (1) ······················································ 5-22

7.

VTR state check (2) ······················································ 5-22

8.

VTR state check (3) ······················································ 5-23

9.

Record of Use Check ···················································· 5-23

3-2.

SYSTEM CONTROL SYSTEM ADJUSTMENTS ···· 5-24

1.

Initialization of D, E, F Page Data ······························· 5-24

2.

Battery End Adjustment (VC-197 board) ····················· 5-24

3.

Battery down voltage check ········································· 5-24

3-3.

SERVO SYSTEM ADJUSTMENTS ··························· 5-25

1.

CAP FG Offset Adjustment (VC-197 board) ··············· 5-25

2.

Switching Position Adjustment (VC-197 board) ·········· 5-25

3.

NTSC LP mode Switching Position Adjustment
(VC-197 board) ···························································· 5-26

3-4.

VIDEO SYSTEM ADJUSTMENTS ···························· 5-26

1.

28 MHz Origin Oscillation Adjustment
(VC-197 board) ···························································· 5-26

2.

Filter f0 Adjustment (VC-197 board) ··························· 5-27

3.

Y OUT Level Adjustment (VC-197 board) ·················· 5-27

4.

C OUT Level Adjustment (VC-197 board) ·················· 5-28

5.

RP Filter f0 Adjustment (VC-197 board) ····················· 5-28

6.

AFC f0 Adjustment (VC-197 board) ···························· 5-29

7.

NTSC Hi8 REC Y Current Adjustment
(VC-197 board) ···························································· 5-30

8.

PAL Hi8 REC Y Current Adjustment
(VC-197 board) ···························································· 5-30

9.

NTSC Hi8 REC C Current Adjustment
(VC-197 board) ···························································· 5-31

10.

PAL Hi8 REC C Current Adjustment
(VC-197 board) ···························································· 5-32

11.

REC C Current Adjustment
(VC-197 board) ···························································· 5-33

3-5.

IR Transmitter Adjustments ·········································· 5-34

1.

IR Video Carrier Frequency Adjustment
(MI-27/28 board) ·························································· 5-34

2.

IR Video Deviation Adjustment (MI-27/28 board) ······ 5-34

3.

IR Audio Deviation Adjustment (MI-27/28 board) ······ 5-35

3-6.

AUDIO SYSTEM ADJUSTMENT ······························ 5-36

1.

1.5 MHz Deviation Adjustment (VC-197 board) ········· 5-37

2.

1.7 MHz Deviation Adjustment (VC-197 board) ········· 5-37

3.

BPF f0 Adjustment (VC-197 board) ···························· 5-38

3-7.

LCD SYSTEM ADJUSTMENT ·································· 5-39

1.

LCD Initial Data Input ················································· 5-39

2.

VCO Adjustment (PD-88 baord) ·································· 5-40

3.

H POS Adjustment (VC-197 baord) ····························· 5-40

4.

Bright Adjustment (VC-197 baord) ······························ 5-41

5.

Contrast Adjustment (VC-197 baord) ·························· 5-41

6.

Color Adjustment for NTSC model (VC-197 baord) ··· 5-42

7.

Hue Adjustment for NTSC model  (VC-197 baord) ···· 5-42

8.

Burst Cleaning Adjustment for PAL model
(VC-197 baord) ···························································· 5-43

9.

Color Adjustment for PAL model (VC-197 baord) ······ 5-43

10.

V-COM Adjustment (PD-88 baord) ····························· 5-44

11.

White Balance Adjustment (VC-197 baord) ················ 5-44

6-1.

EXPLODED VIEWS ··················································· 6-1

6-1-1. OUTER CABINET ASSEMBLY ································· 6-1
6-1-2. LCD BLOCK, UPPER CABINET

BLOCK ASSEMBLY ··················································· 6-2

6-1-3. MD BLOCK ASSEMBLY ··········································· 6-3
6-1-4. CASSETTE COMPARTMENT BLOCK SECTION ··· 6-4
6-1-5. LS CHASSIS BLOCK SECTION ······························· 6-5
6-1-6. MECHANISM CHASSIS BLOCK SECTION ············ 6-6
6-2.

ELECTRICAL PARTS LIST ······································· 6-7