JVC AV DV75 Service Manual

BLOCK DIAGRAM

FM

AM

TUNER BLOCK

PLL

IC721

LC72131D

IF/DET MPX

IC771

LA1837

STEREO

TUNE/IFC

PLL-CE

TM-BASS

DATA(M)

CLK(M)

TUNER L

TUNER ON

TUNER ON

MAIN C.B

OSD/KEY CON
C.B

PHONO

J501(1/2)

CD

AUX

J502

J901(1/2)

VIDEO 1

DVD/MD IN

J902(1/2)

VIDEO 2
LD/TV IN

FUNCTION

IC502(1/2)

BU4052BCF

PHONO EQ

IC501(1/2)

NJM2068MD

MIC AMP

IC601(1/2)
NJM4558

B

FUNCTION

IC503

M62445AFP

L OUT

TUNER
PHONO
CD

L-CH

L-CH

L-CH

AUX
VIDEO

DATA(M)

CLK(M)
STB(M)

R OUT
VR IN (L)
VR IN (R)

J501(2/2)

TAPE

MONITOR

J901(2/2)

VIDEO 1

DVD/MD IN

J902(2/2)

VIDEO 2

LD/TV IN

J501

VIDEO 3

AUDIO IN

VIDEO 3

VIDEO IN

VIDEO C.B (1/2)

J904 (1/2)

VIDEO 1

DVD OUT

J905 (1/2)

VIDEO 2

LD/TV OUT

J904 (2/2)

VIDEO 1

DVD/MD OUT

J905 (2/2)

VIDEO 2

LD/TV OUT

Q902

Q903

J903 (1/2)

MONITOR

VIDEO OUT

Q901

Q904-907

J903 (2/2)

MONITOR

REC OUT

REC OUT SW

IC902(1/4,2/4)

BU4066BCF

REC OUT

CONTOROL

VIDEO SW

IC901

BA7625

AV-A

AV-B

AV-A
AV-B

AV-A

AV-BAAV-B

REC OUT-L

MIC MIX OUT-L
MIC MIX OUT-R

TAPE MONITOR

BBE1

BBE2

AC3 KARAOKE

K-CON

K-CON

TAPE MONITOR SW

IC701(1/2)
TC4053BF

FL-CH

FL-CH

R-CH R-CH

STB(M)

CLK(M)

DATA(M)

BBE

IC601

BA3880S

LEVEL

CONTROL

D601,602

IC101(1/2)

NJM4558MD

Q401

MUTE

MUTE

Q721

Q301

MUTE

SURROUND VOL

IC145(1/2)
M624396P

SURROUND

L AMP

CENTER

AMP

Q402-417,

420,421,440

Q303,305,307,309,

311,313,315,317

Q201

MUTE

Q203,205,207,209,

211,213,215,217

B

A

S292(1/2)

S291(1/2)

OFFON OFFON

VIDEO C.B (2/2)

PHONES

J603

SW401

FUNCTION

A

FRONT

SPEAKERS

4Ω/8Ω

B

SURROUND

SPEAKER

8Ω

CENTER

SPEAKER

4Ω/8Ω

J715

L

R

J715

SUPER

WOOFER

SW102
MULTY

SW101

VOLUME

JOG2

JOG1

KEY

MATRIX

KEY

MATRIX

KEY

MATRIX

S101,
S102,103
S107-109
S111,113

S110,112,114-116

RE

KEY2

KEY1

LED DRIVER

IC101,102

BU4049BLF

DISPLAY

FL101

FRONT C.B

AC IN

D002-004

VS

PT C.B

SPKR C.B

FIL1
FIL2

+VH

-VH

+VL

+VL

-VL

-VL

D107

D108,109

D121

S101

Q110

RY102

RY101

4Ω

8Ω

VM

VM

REG

Q105
Q106-109

-VFL
REG

Q118

-VCC
REG

Q101,
Q102,
Q999

+VCC

REG

Q103

MUTE

Q112,113

2 TIMES

DET

Q117

Q114,115

RESET

Q116

-VFL

HOLD

VM

+VCC

-VCC

FRONT/

SURROUND/

CENTER

AMP

FIL1
FIL2

SYNC DET

Q106

VD

POWER

AC

DET

RDS

IC851*6

BU1920FS

R-CH

R-CH

R-CH

R-CH

R-CH

R-CH

R-CH

R-CH

R-CH

R-CH

R-CH

R-CH

JR905

MIC C.B

SL-CH

C-CH

SW-CH

CONT1

TUNER
PHONO
CD

R-CH

R-CH

R-CH

R-CH
R-CH

AUX
VIDEO

FR-CH

FR-CH

SURROUND

MODE SELECT

IC651(2/3)
TC4053BF

KEY

CONTROL

IC650

M65847AFP

Q651

CENTER VOL

IC146(1/2)
M624396P

S-WOOFER VOL

IC146(2/2)
M624396P

CONT2

GRAPHIC

EQUALIZER

IC701

M62431AFP

GEQ C.B

STB-31

CLK(M)

DATA(M)

FL-CH
FR-CH

FL-CH

FR-CH

FR-CH,
SL-CH,
SR-CH,
C-CH

FR-CH

FR-CH

FR-CH

FR-CH

FR-CH

FRONT

L AMP

µCON

IC103

µPD780028GF-027-3BA

Q111

B

A

SR-CH

S292(2/2)

S291(2/2)

OFFON OFFON

A

B

L

R

J201
J901

J301
J902

Q001

VS

REG

Q002,003

JW403

JW424

JW445

MUTE

FR-CH

HOLD

FR-CH

SR-CH

Q228
+REG

Q219,221,222

+REG

SR-CH

Q319,321,322

+REG

FR-CH

Q220,225,226

-REG

SR-CH

Q320,325,326

-REG

RY001

PT101

T.F

F102

F101

SW101

120V

|

220V-230V

|

240V

Q227

MUTE

SR-CH

Q327

MUTE

Q418

HOLD

DET

Q240

SR-CH

HOLD

HOLD

DET

Q340

OVERHEAT

DET

Q223,224

SR-CH

OVERHEAT

DET

Q323,324

HOLD

HOLD

DET

Q440

OVERHEAT

DET

Q414,415

S401,402

KEY

MATRIX

S403

MIC1

J601

MIC2

J602

DELAY AMP

IC601(2/2)

NJM4558

DELAY

MIX

Q601

STEREO

TUNE/IFC

PLL-CE

TM-BASS

DATA(M)

CLK(M)

STB(M)

STB-31

DSP-CE

C42-CS

TAPE-ATT

C42-CDOUT

CDIN

SCK

C49-CS

INTREQ

C49-CDOUT

C49-RESET

DSP SW

POWER

CONT1

CONT2

MUTE

MIC

Q107,109

BIAS

HOLD

MIC

RESET

RESET

Q111

SCAN

Q113

MUTE

Q119

MUTE

Q119

P13

P14

P13,14,20-30

P1-35,G1-11

K-SCAN

PT002

DIGITAL

INPUT

VIDEO 2

J101

DOLBY DIGITAL C.B

IC115

GP1F37R

(COAXIAL)

VIDEO 1

(OPTICAL)

IC122

GP1F37R

VIDEO 3

IC118

TC74HCU04

SURROUND
SOUND CODEC
A/D,D/A CONV.

IC102

CS4226

IC104

NJM2068MD

ADO/CS

DOLBY AC-3

PROLOGIC

DECODER

IC101

YSS248

CLOCK

SW

IC121

TC74HC00AF

X101

10MHz

PORT1~5

5

SD0~2

3

SDI0

OVL/ERR

SDA

SCK

SI

CS

SCK

SO

SI

A
B
C

IC105(1/2)

NJM2068MD

IC107(1/2)

NJM2068MD

SUB WOOFER

ON/OFF SW

IC108

TC4053BF

ABC

CENTER SW

IC109

TC4053BF

ABC

IC107(2/2)

NJM2068MD

Q401~403

IC111

NJM2068MD

IC113

NJM2068MD

IC112(2/2)

NJM2068MD

IC110

NJM2068MD

IC112(1/2)

NJM2068MD

DSP/

ECHO

IC117

M65849BFP

CLK

DATA

DSP-CE

SURROUND

MODE SELECT

IC119

TC4053BF

R-CH

IC120

NJM2068MD

IC106

NJM2068MD

-VL

R-CH

IC116

SELECT

SW

KARAOKE

F-L

F-R

IC114

IC114

(1/2)

(2/2)

1211

WIRING-1 (MAIN)

1

A

B

C

D

234567

8

9

10

11 12 13

14

E

F

G

H

I

J

K

1413

SCHEMATIC DIAGRAM-1 (MAIN 1/2)

1615

WIRING-2 (SPKR) SCHEMATIC DIAGRAM-2 (SPKR)

1

A

B

C

D

234567

E

F

G

H

I

J

K

1817

SCHEMATIC DIAGRAM-3 (MAIN 2/2)

2019

WIRING-3 (FRONT)

1

A

B

C

D

234567

8

9

10

11 12 13

14

E

F

G

H

I

J

K

2221

SCHEMATIC DIAGRAM-4 (FRONT)

VDD

2423

WIRING-4 (TUNER)

1

A

B

C

D

234567

8

9

10

11 12 13

14

E

F

G

H

I

J

K

2625

SCHEMATIC DIAGRAM-5 (TUNER)

2827

WIRING-5 (DOLBY)

1

A

B

C

D

234567

8

9

10

11 12 13

14

E

F

G

H

I

J

K

3029

SCHEMATIC DIAGRAM-6 (DOLBY)

GND

VCC

3231

WIRING-6 (HP/VIDEO/GEQ)

1

A

B

C

D

234567

8

9

10

11 12 13

14

E

F

G

H

I

J

K

3433

SCHEMATIC DIAGRAM-7 (HP/VIDEO/GEQ)

3635

WIRING-7 (AC/PT)

1

A

B

C

D

234567

8

9

10

11 12 13

14

E

F

G

H

I

J

K

3837

SCHEMATIC DIAGRAM-8 (AC/PT)

4039

WIRING-8 (OSD/KEY/MIC)

1

A

B

C

D

234567

8

9

10

11 12 13

14

E

F

G

H

I

J

K

4241

SCHEMATIC DIAGRAM-9 (OSD/KEY/MIC)

4443

ELECTRICAL ADJUSTMENT

FL (BJ691GK) GRID ASSIGNMENT/ANODE CONNECTION

TUNER C.B

FFE801

4

TP1

< TUNER SECTION >

1/3

L981

4

TP3

L772

TP2

TP4

L771

IC771

63

TP4

TP3

GRID ASSIGNMENT

TP6

TP5

1. Clock Frequency Check
Settings: • Test point: TP2 (CLK IC770 pin30)
Method: Set to AM 1602kHz and check that the test

point becomes 2052kHz±45Hz.

2. AM VT Check
Settings: • Test point: TP1 (VT)
Method: Set to AM 1710kHz and check that the test

point is less than 8.5V.
Then set to AM 530kHz and check that the test
point is more than 0.6V.

3. AM IF Adjustment
Settings: • Test point: TP5, TP6

L772 ..............................................450kHz

4. AM Tracking Adjustment
Settings: • Test point: TP5, TP6

• Adjustment location: L981 (1/3)

Method: Set to AM 999kHz and adjust L981 so that the

test point becomes maximum.

5. FM VT Check
Settings: • Test point: TP1 (VT)
Method: Set to FM 87.5MHz, 108.0MHz and check that

the test point is more than 0.5V (87.5MHz) and
less than 8.0V (108.0MHz).

PRACTICAL SERVICE FIGURE

< TUNER SECTION >

<FM SECTION>

Signal to noise ratio: More than 62dB

(at 98.0MHz)
Distortion: Less than 2.0%
(Input: 60dB) (at 98.0MHz)
Stereo separation: More than 22dB

(at 98.0MHz)
Intermediate frequency: 10.7MHz

<AM SECTION>

Sensitivity: Less than 60dB (at 600kHz)
(S/N 20dB) Less than 58dB

(at 1000/1400kHz)
Signal to noise ratio: More than 36dB
(Input: 74dB) (at 1000kHz)
Distortion: Less than 1.5%

(at 1000kHz)
Intermediate frequency: 450kHz

ANODE CONNECTION

6. DC Balance/Mono Distortion Adjustment
Settings: • Test point: TP3, TP4

• Adjustment location: L771

• Input level: 60dB

Method: Set to FM 98.0MHz and adjust L771 so that

the voltage between TP3 and TP4 becomes
0V±0.04V.
Next, check that the distortion is less than

1.3%.

4645

IC BLOCK DIAGRAM
IC, BU4094BCF

IC, M62431FP

IC, BA3880S

47

IC, CS4226

IC, CS4926

IC, BA7625

48

IC, M62439SP

IC, LC72131D

IC, BA033ST

_

+

49

IC, TC4053BF

IC, M65849BFP631D

IC, M65847AFP

50

IC DESCRIPTION
IC, UPD780228GF

Pin No. Pin Name I/O Description

1
2
3
4
5
6
7
8

9
10
11
12
13

14-16

17
18
19

20, 21

22
23
24
25

________________

K-SCAN

O-PLL-CE

O-DATA (M)

TUNE/IFC

O-STB (M)

O-MUTE

O-CLK (M)

O-OSD (CE)

/I-SYNC-DET

O-PRO-CE/O-DSP-CE

—

TM-BASE

—
—
IC

VSS

VDD

—

______

CS

SCK

SI

SO

—

—
—
—
—
—

Scan output to diode input (Active “L”).

O

Tuner PLL chip enable output.

O

Sound CTRL, PLL, DOLBY PROLOGIC or DSP, AC-3 VOL, GEQ. Data output.

O

I
O
O
O
O
O
O

__________________

Tuner TUNE/IFC detection input.
Sound CTRL, KEYCON strobe output.

________

System mute ON/OFF output.
Sound CTRL, PLL, DOLBY PROLOGIC or DSP, AC-3 VOL, GEQ. Clock output.
OSD chip enable output.

_____

System power supply. ON/OFF output.
DOLBY PROLOGIC or DSP chip enable output.
Not used.
Reference clock input for watch.

I

IC101. Strobe output from shift register (1).

O

Not used.
GND.
GND.
Power supply pin.
Not used.
DOLBY digital (AC-3) control. CS output.

O

DOLBY digital (AC-3) control. Clock output.

O

DOLBY digital (AC-3) control. Data output.

O

DOLBY digital (AC-3) control. Data input.

I

Pin No. Pin Name I/O Description

44
45
46

47, 48

49
50
51
52

53-64

65

66, 67

68

69-73

74
75

76-78

79
80

81-89

90-100

I-SYNC-DET/I-RDS-SIG

I-JOG2

I-FU-JOG1

I-KEY2, I-KEY1

I-MIC
AVSS

O-STB-31

POWER-LED

P35-P24

P23/I-AM10K

P22/I-VF.KC.EC

P20/I-AC3

P19-O-P15

___________________

P14/I-STEREO

___________________

P13/I-HPMUTE

P12-P10

VDD2

-VFL

P9-P1

G11-G1

—
O
O
O

O
I/O
I/O

O
I/O
I/O

O

—

—

O

O

OSD sync. AD input. RDS tuning signal level. AD input.

I

Rotary encoder (JOG2). AD input.

I

Function selector rotary encoder (JOG1). AD input.

I

Key 2, 1. AD input.

I

Microphone signal level detector. AD input.

I

ADND.
GEQ IC chip enable output.
Power LED ON/OFF output (Active “H”).

________

FL segment output (P35-P24).
FL segment output (P23)/supporting AM step initialization 10 kHz.
FL segment output (P22, P21)/supporting VF, key control, ECHO. Diode input.
FL segment output (P20)/supporting AC-3. Diode input.
FL segment output (P19-P15).
FL segment output (P14). Turner/stereo detection input (stereo at “L”).
FL segment output (P13). Headphones insertion detection input (HP insertion at “L”).
FL segment output (P12-P10).
Power supply pin.
– Voltage.
FL segment output (P9-P1).
FL grid output (G11-G1).

26
27
28
29
30
31

32

33
34
35
36
37
38
39
40
41
42

SDA

______________

ADO/CS

I-RDS-CLK

I-RDS-DATA

_____________

RESET

O-CONT.1

O-CONT.2

OSD-CLK

___________

I-RMC

OSD-DATA

C-SHIFT

VDD1

X1
X2

VSS1

AVDD

____________

HOLD

—

—
—
—
—
—

CODEC IC (CS4226) control. Data output.

I

CODEC IC (CS4226) control. CS output.

O

RDS clock input (external interrupt).

I

RDS data input.

I

_____

Reset.
Master VOL control output for SL/SR.

O

Master VOL control output for center/SUB-woofer (TRIM control output for center/

O

SUB-woofer).
OSD clock output.

O

Remote control input.

I

OSD data output.

O

Microprocessor clock shift output (Active “H”).

O

Power supply pin.
Connected to 5.76MHz oscillator.
Connected to 5.76MHz oscillator.
GND.
Power supply pin.
System power supply voltage monitoring. AD input.

I

43

I-RE-VOL

Rotary encoder (VOL). AD input.

I

5251