SONY STR VX500 Service Manual

STR-VX500

SERVICE MANUAL

This set is the tuner and amplifier
section in MHC-VX500.

SPECIFICATIONS

Amplifier section

The following measured at AC 120, 220, 240V 50/60 Hz
DIN power output (Rated) (FRONT)

120 + 120W (6 Ω at 1kHz DIN)

Continuous RMS power output (Reference)

FRONT SPEAKER: 150 + 150W
(6 Ω at 1kHz, 10% THD)

Inputs MD/VIDEO 1 IN (phono jacks): voltage

450/250mV, impedance 47kΩ
AV INPUT AUDIO (phono jacks): voltage
250mV, impedance 47kΩ
MIX MIC 1/2 (phone jack): sensitivity 1mV,
impedance 10kΩ

Output MD/VIDEO 1 OUT (phono jacks): voltage

450/250mV, impedance 1kΩ
PHONES (stereo phone jack): accepts
headphones of 8Ω or more.
FRONT SPEAKER:
accepts impedance of 6 to 16Ω
REAR SPEAKER:
accepts impedance of 16Ω
SUPER WOOFER:
Voltage 1V, impedance 1kΩ

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0MHz
Antenna terminals 75Ω unbalanced
Intermediate frequency 10.7MHz

AM tuner section

Tuning range MW: 531 – 1,602kHz (with the MW tuning

Intermediate frequency 450kHz
Antenna AM loop antenna External antenna terminal

General

Power requirements 120V, 220V or 230 – 240V AC, 50/60Hz

Power consumption 290W
Dimensions (w/h/d) Approx. 288 × 205 × 375mm
Mass Approx. 8.6kg

E Model

interval set at 9kHz)
530 – 1,710kHz (with the MW tuning
interval set at 10kHz)
SW: 5.95 – 17.90MHz (with the SW tuning
interval set at 5kHz)

Adjustable with voltage selector

MICROFILM

Design and specifications are subject to change without notice.

FM STEREO/FM-AM RECEIVER

STR-VX500

4-4. SCHEMATIC DIAGRAM MAIN (1/2) SECTION

• Refer to page 27 for IC Block Diagrams.

1414

STR-VX500

4-5. SCHEMATIC DIAGRAM MAIN (2/2) SECTION

• Refer to page 13 for Printed Wiring Board.

• Refer to page 27 for IC Block Diagrams.

The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified.

Q854

0.8
BN1F4M

R857
22k

0

0.1

Q855
2SC2958L
RELAY SWITCH

1515

STR-VX500

4-6. SCHEMATIC DIAGRAM POWER AMP SECTION

The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified.

1616

STR-VX500

4-8. SCHEMATIC DIAGRAM DISPLAY SECTION

MY,SP,IA,HK
MODEL

EA MODEL

• Refer to page 28 for IC Block Diagrams.

• Refer to page 12 for Waveform.

1818

STR-VX500

4-10. SCHEMATIC DIAGRAM SLIDING PANEL SECTION

• Refer to page 28 for IC Block Diagrams.

2020

4-13. SCHEMATIC DIAGRAM TRANS SECTION

2.5A

2.5A

(Page 15)

T6.3AL

250V

STR-VX500

16

The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified.

23

STR-VX500

4-14. SCHEMATIC DIAGRAM AV/MIC SECTION

• Refer to page 28 for IC Block Diagrams.

24

4-16. IC BLOCK DIAGRAMS

• MAIN BOARD

IC300 LV1041M

L-R RECT

R DET3

DC CUT1

DC CUT2

L+R RECT

VCS TH

VCS 1

VCS 2

VLR 2

VLR 1

VLR TH

L RECT

DC CUT4

R RECT

DC CUT3

L BPF3

R BPF2

R BPF1

S DC OUT

C DC OUT
R DC OUT

L DC OUT

V REF

VCC

C OUT

S OUT

R OUT

L OUT

GND

L IN

R IN

S IN

DELAY OUT

C VOL IN

DET

IREF

R OUT

R NF

L NF

L OUT

78

80

79

1

BPF

2

3
4
5

6

7

V REF

8

9

C

10

S

R

11

L

12

12

13

SW

P

B

P

B

S

NF

14

15

16

17

18

19

20

20

21

22

23

24

77

76

RECT

R

L

P

B

S

C VOL OUT

LOGIC

FF

VCA VCA

VCA VCA VCA VCA

P

B

P

B

P

S

B

P

B

S

2928

C OP IN

RECT

STRIM

P

B

P

B

L

R

R

L

MASTER

VOL

26

25

27

VCC

7475

P

B

30

GND

C OP NF

73

LOGIC LOGIC

S

MODE

P

C

72

VCA VCA

C MODE

STRIM

VOL/

MUTE

P

BB

31

32

33

VOL REF

C OP OUT

S OP OUT

71

LOGIC

FF

DC

CUT

LR

S

34

35

S OP IN

S OP NF

P

B

P

B

CH

CONTROL

P

B

C

D

MASTER VOL

S VOL OUT

6970

IN

FILTER

SRAM

PCM

CONTROL

PCM

3736

OP VREF

FILTER

68

RECT

RECT

B NR

OUT

38

VOL

BPF

CONTROL

NOISE

FILTER

NOISE

GEN

P

B

S VOL IN

VOL

67

66

65

64

L BPF2

BPF

63

L BPF1

62

DC CUT

61

60

59
58
57
56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

RT IN

LT IN

DC CUT

C MODE

GND
NS BPF1
NS BPF2

OSC

CLK

DATA

ENABLE

DATA

CLK

ENABLE2

VSS

OSC

OSC

VDD

A/D

NS

D/A

DC CUT

DATA

DECODER

VDD

39

S OUT

R

L

OSC

IEV

40

26

IC401 M65850P

1

LPF1IN

VCC

1/2 VCC

AUTO

RESET

LPF1

CLOCK

REF

OSCILLATOR

CLOCK

MAIN

RESET

CONTROL

D1

DO0

A/D

2 345 6 7

OP1IN

OP1OUT

LPF1OUT

DO1

CC1

OP2IN

D/A

MO

MI

OP2OUT

LPF2IN

20KBIT

CC2

LPF2OUT

891014 13 12 11

LPF2

SRAM

GND

IC851 µPC1237HA

OVER LOAD DET

V

CC

OFFSET DET

LATCH/

AUTORESET

AC OFF

DET

1 2 3 4 5 6 7 8

F/F

MUTE

ON

V

CC

27

• PANEL BOARD

IC505 µPD4053BC

1

B1

B0

2

C1

3

C.COM

4

5

CO

6

INH

7

VEE

8

VSS

OPEN

OPEN

OPEN

IC506 BA3833F-E2

VDD

16

RESET

B.COM

15

14

A.COM

13

A1

A0

12

11

A

10

B

C

9

C

PREF

LINE

NF

LINE

IN

GND

BIAS

1

REFFERENCE

2

CURRENT

3

4

5

6

Bias

C

7

NC

8

NC

9

NC

RESET

BPF

BPF DET

BPF DET

BPF DET

DET

DET

18

RESET

17

f01

16

f02

15

f03

14

f04

13

f

12

VCC

11

NC

10

NC

• MOTOR BOARD

IC891 LB1641

T.S.D O.C.P

MOTOR

DRIVE

FWD/REV/STOP

CONTROL LOGIC

2 3

1

GND

DRIVE

MOTOR

NOISE

FILTER

5 6 7 8 9 10

4

VCC 1

FWD.IN

REV.IN

CLAMP

VCC 2

NOISE

FILTER

MOTOR

DRIVE

DRIVE

MOTOR

• MIC/ECHO BOARD

IC6002 M65850P

1

LPF1IN

VCC

1/2 VCC

AUTO

RESET

LPF1

CLOCK

OSCILLATOR

CLOCK

MAIN

RESET

CONTROL

D1

A/D

2 345 6 7

OP1OUT

LPF1OUT

REF

OP1IN

DO0

DO1

CC1

OP2IN

D/A

MO

MI

OP2OUT

LPF2IN

20KBIT

CC2

LPF2OUT

891014 13 12 11

LPF2

SRAM

GND

28