Sony Walkman gv-a500 User manual

GV-A500/A500E

US Model

Canadian Model

GV-A500

AEP Model

UK Model

E Model

Hong Kong Model

GV-A500E

SERVICE MANUAL

VIDEO CASSETTE RECORDER

MICROFILM

B MECHANISM Photo : GV-A500E

SPECIFICATIONS

GV-A500 (NTSC)

GV-A500E (PAL) For MECHANISM ADJUSTMENT, refer to

the “8mm Video MECHANICAL

ADJUSTMENT MANUAL ” (9-973-801-11).

— 2 —

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH

MARK !ON THE SCHEMATIC DIAGRAMS AND INTHE PARTS

LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE

COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS

APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS

PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE !SUR LES

DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT

CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE

REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY

DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU

DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

1. Check the area ofyourrepairforunsolderedorpoorly-soldered

connections. Checktheentireboardsurfaceforsoldersplashes

and bridges.

2. Check the interboard wiring to ensure that no wires are

"pinched" or contact high-wattage resistors.

3. Look for unauthorized replacement parts, particularly

transistors, that were installed during a previous repair. Point

them out to the customer and recommend their replacement.

4. Look for parts which, through functioning, show obvioussigns

of deterioration. Point them out to the customer and

recommend their replace-ment.

5. Check the B+ voltage to see it is at the values specified.

6. Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270˚C

during repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

SAFETY CHECK-OUT

After correcting the original service problem, perform the following

safety checks before releasing the set to the customer.

— 3 —

TABLE OF CONTENTS

SELF-DIAGNOSIS FUNCTION

1. Self-diagnosis Function ················································ 5

2. Self-diagnosis display··················································· 5

3. Service Mode Display ·················································· 5

3-1. Display Method ···························································· 5

3-2. Switching of Backup No. ············································· 5

3-3. End of Display······························································ 5

4. Self-diagnosis Code Table ············································ 6

1. GENERAL

Before you begin

Using this manual ······························································· 1-1

Checking supplied accessories ··········································· 1-1

Basic operations

Installing the AC power adaptor ········································· 1-1

Inserting a cassette ······························································ 1-1

Playing back a tape ····························································· 1-2

Advanced operations

Watching on a TV screen ···················································· 1-3

Editing onto another tape···················································· 1-4

Recording from a VCR or TV ············································ 1-4

Changing the mode settings················································ 1-5

Using alternative power sources ········································· 1-6

Additional information

Charging the vanadiumlithium battery in the VCR ············ 1-7

Usable cassettes and playback modes································· 1-7

Notes on “InfoLITHIUM” battery pack ····························· 1-7

Maintenance information and precautions·························· 1-8

Using your VCR abroad ····················································· 1-9

Trouble check ········································································· 1-9

Self-diagnosis display····························································· 1-10

Identifying the parts································································ 1-10

Warning indicators·································································· 1-11

2. DISASSEMBLY

2-1. CASSETTE LID ASSEMBLY ····································· 2-1

2-2. LCD CABINET···························································· 2-1

2-3. CRYSTAL INDICATION MODULE,

FLUORESCENT COLD CATHODE TUBE,

PD-88 BOARD····························································· 2-2

2-4. CABINET (BOTTOM) ASSEMBLY··························· 2-3

2-5. MD BLOCK ASSEMBLY ··········································· 2-3

2-6. CONTROL (FK-71) SWITCH BLOCK,

DD-100 BOARD ·························································· 2-3

2-7. VC-197 BOARD ·························································· 2-4

2-8. B MECHANISM DECK ·············································· 2-4

2-9. CABINET (R) BLOCK ASSEMBLY,

FP-571 BOARD ··························································· 2-4

2-10. EX-34 BOARD ···························································· 2-4

2-11. IO-62, IR-29, FP-572, FP-573, FP-574,

FP-575 BOARDS SPEAKER ······································ 2-5

2-12. CABINET (UPPER) ASSEMBLY ······························· 2-5

2-13. CIRCUIT BOARDS LOCATION ································ 2-6

3. BLOCK DIAGRAMS

3-1. OVERALL BLOCK DIAGRAM ································· 3-1

3-2. VIDEO BLOCK DIAGRAM 1 ···································· 3-4

3-3. VIDEO BLOCK DIAGRAM 2 ···································· 3-7

3-4. SERVO BLOCK DIAGRAM ······································· 3-10

3-5. SYSTEM CONTROL BLOCK DIAGRAM ················ 3-13

3-6. AUDIO BLOCK DIAGRAM ······································· 3-15

3-7. MODE CONTROL BLOCK DIAGRAM ···················· 3-17

3-8. LCD BLOCK DIAGRAM ··········································· 3-20

3-9. POWER SUPPLY BLOCK DIAGRAM ······················ 3-23

4. PRINTED WIRING BOARDS AND

SCHEMATIC DIAGRAMS

4-1. FRAME SCHEMATIC DIAGRAM····························· 4-1

4-2. PRINTED WIRING BOARDS AND

SCHEMATIC DIAGRAMS ········································· 4-4

• VC-197 (MAIN) PRINTED WIRING BOARD ······· 4-5

• VC-197 (REC/PB HEAD AMP)

SCHEMATIC DIAGRAM ··························· 4-11

• VC-197 (EVR) SCHEMATIC DIAGRAM ··············· 4-16

• VC-197 (VIDEO PROCESS)

SCHEMATIC DIAGRAM ··························· 4-19

• VC-197 (Y/C PROCESS)

SCHEMATIC DIAGRAM ··························· 4-23

• VC-197 (TBC/CNR) SCHEMATIC DIAGRAM ······ 4-27

• VC-197 (VIDEO IN/OUT)

SCHEMATIC DIAGRAM ··························· 4-30

• VC-197 (RGB DECODER)

SCHEMATIC DIAGRAM ··························· 4-33

• VC-197 (IR DRIVER), IR-29 (TRANSMITTER)

SCHEMATIC DIAGRAM ··························· 4-37

• IR-29 (TRANSMITTER)

PRINTED WIRING BOARD ······················ 4-40

• VC-197 (SERVO/SYSTEM CONTROL)

SCHEMATIC DIAGRAM ··························· 4-41

• VC-197 (SERVO) SCHEMATIC DIAGRAM ·········· 4-44

• VC-197 (MODE CONTROL)

SCHEMATIC DIAGRAM ··························· 4-47

• VC-197 (AUDIO) SCHEMATIC DIAGRAM ·········· 4-51

• IO-62 (AV IN/OUT) SCHEMATIC DIAGRAM ······ 4-55

• EX-34 (MULTI CONNECTOR)

SCHEMATIC DIAGRAM ··························· 4-59

• EX-34 (MULTI CONNECTOR)

PRINTED WIRING BOARD ······················ 4-63

• IO-62 (AV IN/OUT) PRINTED WIRING BOARD · 4-65

• PD-88 (LCD DRIVER)

SCHEMATIC DIAGRAM ··························· 4-68

• PD-88 (LCD DRIVER)

PRINTED WIRING BOARD ······················ 4-71

• DD-100 (POWER SUPPLY)

PRINTED WIRING BOARD ······················ 4-73

• DD-100 (POWER SUPPLY)

SCHEMATIC DIAGRAM ··························· 4-75

5. ADJUSTMENT

5-1. PREPARATIONS ························································· 5-1

1-1. PREPARATIONS BEFORE ADJUSTMENT ·············· 5-1

1-1-1.List of Service Tools····················································· 5-1

1-1-2.Adjusting Remote Commander ···································· 5-2

1. Using the adjusting remote commander ······················· 5-2

2. Precautions upon using the adjusting

remote commander ······················································· 5-2

1-1-3.Page D Address ···························································· 5-3

1-1-4.Page F Address ····························································· 5-4

1-1-5.Page E Address ····························································· 5-7

1-2. INITIALIZATION OF D, E, F PAGE DATA ··············· 5-8

1. Initialization of D, E, F Page Data ······························· 5-8

2. Modification of D Page Data········································ 5-8

3. Modification of F Page Data ········································ 5-9

4. Modification of E Page Data ········································ 5-10

1-3. Data Processing ···························································· 5-10

5-2. MECHANICAL SECTION ADJUSTMENT ·············· 5-11

2-1. OPERATING WITHOUT A CASSETTE···················· 5-11

2-2. TAPE PATH ADJUSTMENT······································· 5-11

1. Preparations for adjustments ········································ 5-11

— 4 —

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 RECY Current Adjustment

(VC-197 board) ···························································· 5-30

8. PAL Hi8 RECY Current Adjustment

(VC-197 board) ···························································· 5-30

9. NTSC Hi8 REC C CurrentAdjustment

(VC-197 board) ···························································· 5-31

10. PAL Hi8 REC C CurrentAdjustment

(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 DeviationAdjustment (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. ContrastAdjustment (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-COMAdjustment (PD-88 baord) ····························· 5-44

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

6. REPAIR PARTS LIST

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

— 5 —

SELF-DIAGNOSIS FUNCTION

1. Self-diagnosis Function

When problems occur while the unit is operating, the self-diagnosis

function starts working, and displays on the LCD window what to

do. This function consists of two display; self-diagnosis display and

service mode display.

Detailsofthe self-diagnosis functions areprovidedin the Instruction

manual.

2. Self-diagnosis display

When problems occur while the unit is operating, the counter of the

LCD window shows a 4-digit display consisting of an alphabet and

numbers, which blinks at 3.2 Hz. This 5-character display indicates

the “repaired by:”, “block” in which the problem occurred, and

“detailed code” of the problem.

3. Service Mode Display

The service mode display shows up to six self-diagnosis codes shown in the past.

3-1. Display Method

While pressing the “STOP” key, set the power switch from OFF to “ON”, and continue pressing the “STOP” key for 5 seconds continuously.

The service mode will be displayed, and the counter will show the backup No. and the 5-character self-diagnosis codes.

3-2. Switching of Backup No.

By rotating the SEL/PUSH EXEC dial, past self-diagnosis codes will be shown in order. The backup No. in the [] indicates the order in which

the problem occurred. (If the number of problems which occurred is less than 6, only the number of problems which occurred will be shown.)

[1] : Occurred first time [4] : Occurred fourth time

[2] : Occurred second time [5] : Occurred fifth time

[3] : Occurred third time [6] : Occurred the last time

3-3. End of Display

Turning OFF the power supply will end the service mode display.

1 1

3 1C

Repaired by: Refer to page 7, 8

Self-diagnosis Code Table.

C : Corrected by customer Indicates the appropriate

H : Corrected by dealer step to be taken.

E : Corrected by service E.g.

engineer 31 ....Reload the tape.

32 ....Turn on power again.

Block Detailed Code

Blinks at 3.2Hz

LCD screen

Backup No. self-diagnosis codes

C : 3 1 : 1 1[3]

Order of previous errors

Note: The self-diagnosis display data will be backed up by the coin-type lithium battery.When this coin-type lithium battery is

disconnected, the self-diagnosis data will be lost by initialization.

— 6 —

4. Self-diagnosis CodeTable

Block

Function

Detailed

Code

Symptom/State

Condensation.

Video head is dirty.

Non-standard battery is used.

LOAD direction. Loading does not

complete within specified time

UNLOAD direction. Loading does not

complete within specified time

T reel side tape slacking when unloading

S reel side tape slacking when unloading.

T reel fault

S reel fault

FG fault when starting capstan

FG fault during normal capstan operations

FG fault when starting drum

PG fault when starting drum

FG fault during normal drum operations

PG fault during normal drum operations

Phase fault during normal drum operations

LOAD direction loading motor time-

out

UNLOAD direction loading motor

time-out

T reel side tape slacking when

unloading.

S reel side tape slacking when

unloading.

T reel fault

S reel fault

FG fault when starting capstan

FG fault during normal capstan

operations

FG fault when starting drum

PG fault when starting drum

FG fault during normal drum

operations

PG fault during normal drum

operations

Phase fault during normal drum

operations

Self-diagnosis Code

Repaired by:

Correction

Remove the cassette, and insert it again after one hour.

Clean with the optional cleaning cassette.

Use the InfoLITHIUM battery.

Load the tape again, and perform operations from the beginning.

Remove the battery or power cable, connect, and perform