JVC AV-21L81B(-VT), AV-25L81B(-VT) Schematics

AV-21L81B
AV-25L81B

SCHEMATIC DIAGRAMS

COLOUR TELEVISION

BASIC CHASSIS

CH

AV-21L81B
AV-25L81B

CD-ROM No. SML200111

POWER

DISPLAY

MENU

SUPER

BASS

CHANNEL VOLUME

SYSTEM

SOUND MUTING

COLOUR

TV/VIDEO

123

456

PICTURE MODE

7809

CHANNEL SCAN

RETURN

-/--

OFF TIMER

ECO SENSOR

RM-C356 REMOTE CONTROL UNIT

RM-C356-1C

(-VT)

(-VT)

COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

No. 51903
Sep. 2001

AV-21L81B (-VT)

AV-21L81B
AV-25L81B

AV-25L81B (-VT)

q

NOTE ON USING CIRCUIT DIAGRAMS

STANDARD CIRCUIT DIAGRAM

1. SAFETY

The components identified by the symbol and shading are
critical for safety. For continued safety replace safety critical
components only with manufactures recommended parts.

2. SPECIFIED VOLTAGE AND WAVEFORM VALUES

The voltage and waveform values have been measured under the
following conditions.

(1) Input signal : Colour bar signal
(2)

Setting positions of each knob/button and variable resistor

: Original setting position when

shipped
(3) Internal resistance of tester : DC 20kØ/V
(4) Oscilloscope sweeping time : H ⇒ 20µS/div

:V ⇒ 5mS/div
: Others ⇒ Sweeping time is

specified.

(5) Voltage values : All DC voltage values

9Since the voltage values of signal circuit vary to some extent ac-

cording to adjustments, use them as reference values.

3. INDICATION OF PARTS SYMBOL [EXAMPLE]

• In the PW board : R1209

→

R209

Type

•

No indication : Ceramic capacitor
MY : Mylar capacitor
MM : Metalized mylar capacitor
PP : Polypropylene capacitor
MPP : Metalized polypropylene capacitor
MF : Metalized film capacitor
TF : Thin film capacitor
BP : Bipolar electrolytic capacitor
TAN : Tantalum capacitor

(3) Coils

No unit : [µH]
Others : As specified

(4) Power Supply

:B1

: B2(12V)

:9V

:5V

9Respective voltage values are indicated

(5) Test point

: Test point

: Only test point display

4. INDICATIONS ON THE CIRCUIT DIAGRAM

(1) Resistors

Resistance value

•

No unit : [Ø]
k:[kØ]
M:[MØ]
Rated allowable power

•

No indication : 1/10 [W]
Others : As specified
Type

•

No indication : Carbon resistor
OMR : Oxide metal film resistor
MFR : Metal film resistor
MPR : Metal plate resistor
UNFR : Non-Flammable resistor
FR : Fusible resistor

9Composition resistor 1/2 [W] is specified as 1/2S or Comp.

(2) Capacitors

Capacitance value

•

1 or higher : [pF]
less than 1 : [µF]
Withstand voltage

•

No indication : DC50[V]
AC indicated : AC withstand voltage [V]
Others : DC withstand voltage [V]

9 Electrolytic Capacitors

47/50[Example] : Capacitance value [µF]/withstand voltage[V]

(6) Connecting method

: Connector

: Wrapping or soldering

: Receptacle

(7) Ground symbol

: LIVE side ground

: ISOLATED(NEUTRAL) side ground

: EARTH ground

: DIGITAL ground

5. NOTE FOR REPAIRING SERVICE

This model’s power circuit is partly different in the GND. The difference
of the GND is shown by the LIVE : ( ) side GND and the
ISOLATED(NEUTRAL) : ( ) side GND. Therefore, care must be taken
for the following points.

(1) Do not touch the LIVE side GND or the LIVE side GND and the

ISOLATED(NEUTRAL) side GND simultaneously. If the above cau­tion is not respected, an electric shock may be caused. Therefore,
make sure that the power cord is surely removed from the recepta­cle when, for example, the chassis is pulled out.

(2) Do not short between the LIVE side GND and ISOLATED(NEUTRAL)

side GND or never measure with a measuring apparatus ( oscillo­scope, etc.) the LIVE side GND and ISOLATED(NEUTRAL) side
GND at the same time. If the above precaution is not respected , a
fuse or any parts will be broken.

Since the circuit diagram is a standard one, the circuit and cir-

•

cuit constants may be subject to change for improvement with­out any notice.

Sep. 2001 No. 51903

AV-21L81B
AV-25L81B

CONTENTS

SEMICONDUCTOR SHAPES ................................................................................................................................. 2-2

BLOCK DIAGRAM.......................................................................................................................................................... 2-3

CIRCUIT DIAGRAMS

MAIN PWB CIRCUIT DIAGRAM (1/2) ................................................................................................................ 2-5

MAIN (2/2) AND CRT SOCKET PWB CIRCUIT DIAGRAMS ...................................................................................... 2-7

PATTERN DIAGRAMS

MAIN PWB PATTERN......................................................................................................................................................... 2-9

CRT SOCKET PWB PATTERN ....................................................................................................................................... 2-11

SEMICONDUCTOR SHAPES

TRANSISTOR

TOP VIEWBOTTOM VIEW FRONT VIEW

CHIP TR

E

C

B

ECB

EC

B

(G)(D)(S)

ECB

ECB

C

B

E

IC

CHIP IC

TOP VIEWBOTTOM VIEW FRONT VIEW

OUT

E

IN

IN E OUT

N

N

N

1

N

1N

TOP VIEW

1

N

1N

1N

2-2 No.51903

BLOCK DIAGRAM

AV-21L81B

AV-21L81B

AV-25L81B AV-25L81B

J801

VIDEO-1

INPUT

J802,J803

COMPONENT

(VIDEO-2)

INPUT

J804

OUTPUT

J771-J773
FRONT IN
(VIDEO-3)

TU001

TUNER

VIDEO

AUDIO L/MONO

AUDIO R

V/Y

CB

CR

AUDIO L/MONO

AUDIO R

VIDEO OUT

AUDIO L

AUDIO R

VIDEO

AUDIO L/MONO

AUDIO R

SCL
SDA

IF

43

44

42

19

MAIN PWB

28

SF101

FILTER

SF102

FILTER

29,30

SCL
SDA

7

V1-V

8

V1-L

10

V1-R

3

V2-Y

2

V2-L

4

V2-R

37

Vout2

36

Lout2

35

Rout2

V3-V

L3-L

L3-R

Yin1

COUT1

YOUT1

IC801

VIDEO SW

MTV-V

MTV-R

MTV-L

Rout1

Vout1

Lout1

25

27

CB

CR

13

15

14

26

24

23

Q108

BUF

Q111

BUF

IC702

EEPROM

CF104,105

5.5 TRAP

6.5 TRAP

5,6

CF103

6.0 TRAP

CF106

TRAP

29

23

24

2,3

62,63

43

42

47

48

46

SIF IN1

SIF IN2

IF IN1

IF IN2

IC701

V/C DEF.

PROCESSOR

SCL,SDA

SCL1
SDA1

CIN

CVBS/YIN

Y

U

V

7

ROUT

GOUT

BOUT

QSS OUT

VDRB(-)

VDRA(+)

HOUT

IF VOUT

10
64

Q104

BUF

Q109

BUF

51

52

53

35

21,22

33

38

SCL

SDA

5.5 FILTER

6.5 FILTER

32

1

R

G

B

CF140

CF142

Q130

BUF

IC602

SOUND

PROCESSOR

CF130

FILTER

20

12

19

Q136

BUF

12

BUF

Q132

L

R

BASS

IC850

OP AMP

Q137

BUF

8

L, R

9

3

4

11

IC130

PIF/SIF

DETECTOR

IC650

AUDIO AMP

10

20

13

23

CRT SOCKET PWB

2

3

1

IC351

VIDEO AMP

J774
BASS SPEAKER
OUT

J770
HEADPHONE
JACK

8

7

9

SP

L

SP

R

V01

AC IN

VOL+

VOL- CH+ CH- MENU

REMOCON
RECEIVER

S901

POWER SW

POWER

LED

F901

No.51903 No.51903

KEY_IN

REMOTE, LED

D901
RECT

IC901

POWER

REG

T901

SW

TRANSF.

PC901

VOLTAGE

FEEDBACK

IC951

ERROR

AMP

2-3 2-4

IC972

3.3V REG

IC974

REG

L951

IC401

VERT OUT

Q522

H. OUT

3.3V_STB

5V

8V

9V

32V

B1

T551

FBT

FOCUS1

SCREEN

EHV

V

DY01
DEF YOKE

H

CIRCUIT DIAGRAMS

MAIN PWB CIRCUIT DIAGRAM(1/2

TO
SPEAKER

AV-21L81B

AV-21L81B

AV-25L81B AV-25L81B

)

BASS
SPEAKER OUT

R149

FRONT INPUT
(

)

VIDEO-3

VIDEO-1
INPUT

COMPONENT
(

VIDEO-2

INPUT

OUTPUT

4.9V

4.3V

4.9V

4.4V

4.9V

5.3V

4.3V

4.4V

7.0V

5.9V

4.3V

4.3V

4.9V

4.3V

4.3V

5.7V

4.9V

D806

MTZJ12C-T2

)

D807
MTZJ12C-T2

9.0V

5.0V

4.4V

7

IC801

)

1.2Vp-p(H

23

IC801

)

2.2Vp-p(H

27

IC801

)

2.1Vp-p(H

37

IC801

)

2.2Vp-p(H

MAIN PWB ASS’Y(1/2

SCH-1041A-CK(AV-21L81B-VT
SCH-1044A-CK(AV-25L81B-VT

DIFFERENCE LIST(PARTS

2.6V

2.1V

1/50

2SK301/P/-T

C665

1/16

C669

R651

R655

4.6V

-1.0V

5.0V

)

)
)

)

R651 R653 R748R655 R749 C665

SCH-1041A-CK

SCH-1044A-CK

1k

2.2k

2.2k

4.7k

1k

2.2M2.2k

2.2M2.7M

0.12 F/25V1.8M

1.7V

0V

4.4V

4.9V

4.3V

9.0V

4.4V

5.0V

4.2V

4.2V

1.7V

4.1V

4.2V

3.4V

4.2V

5.1V

2.3V

R653

-0.4V

0V

-0.4V

0V

0V

0.6V

0.6V

C669

0.22 F/16V0.22 F/16V

0.12 F/25V

9.0V

0V

4.3V

9.0V

3.0V

2.4V

9.0V

2.6V

1.9V

1.9V

0V

16.9V

0V

4.2V

TO CRT SOCKET
PWB CN10T

1.9V

2.6V

2.6V

2.7V

3.3V

3.3V

5.0V

5.0 5.0

4.8V

V

V

5.0
V

5.0V

5.0V

1.8V

1.6V

3.3V

0V

3.3V

5.0V

2.7V

3.3V

0V

0V

5.0V

33.8V

3.3V

5.0
V

0V

4.6V

8.6V

1.9V

1.7V

5.0V

3.3V3.3V 1.6V0V 1.5V 0V 3.3V 0V 5.1V2.7V2.8V 2.7V

0V

0V

3.3V

2.8
V

1.5V

9.0V

2.2V

K701

R749

2.6V2.6 4.2V2.4
V

3.8V

8.3V

4.9V

3.0V

0V 0V

5.0V

0V

0V

3.0V

R748

1.9
V

V

4.0V

2.0V

5.0V

8.3V 8.3V

3.7V1.5V

0V

3.3V

3.8V

0.8V

0.7V

1.9V

1.9
V

K701

0V

3.9V

3.0V

4.9V

4.9V

4.3V

1.4V

2.0V

3.5V

2.6V

0.6V

2.1V

4.6V

3.6V

4.0V

0

1.9

1.9
V

V

V

IC701

2.8Vp-p(H

IC701

0.55Vp-p(H

IC701

3.4Vp-p(H

IC701

3.6Vp-p(H

4.3V

TDA9386N12S0555

33

43

51

53

4.3V

)

)

)

)

0V

IC701

1.0Vp-p(V

IC701

1.0Vp-p(V

IC701

IC701

IC701

3.0V

21

22

42

1.04Vp-p(H

47

1.6Vp-p(H

52

2.6Vp-p(H

4.3V

3.9V

)

)

)

)

)

NOTE

: OPTION(NON MOUNT

X

: BUS WIRE

BW

: NRSA02J-0R0X

0

: 2SC2412K/QR/-X

1

: 2SA1037AK/QR/-X

2

: MA111-X

3

: DTC124EKA-X

5

: 2SC1740S/QR/-T

7

)

QQR1214-001Y

BW

2-5 2-6No.51903 No.51903

MAIN(2/2)AND CRT SOCKET PWB CIRCUIT DIAGRAMS

DEG COIL

AV-21L81B

AV-21L81B

AV-25L81B AV-25L81B

4.0A

9.0V

C907

QEZ0552-227

19.6V

291V

0V

2.4V

IC401

)

0.7Vp-p(V

2

IC401

)

2Vp-p(V

0V

ICP-N75-Y

1000/25

IC401

30Vp-p(V

20Vp-p(V

)

6

)

TO

14.4V

0.3
V

5

IC401

)

60Vp-p(V

7

100/16

IC401

5Vp-p(V

100/16

470/10

)

47/35

5.3V

3.3V

9.1V

9.8

5.1

2.7

V

V

V

100/16

0.9V

-13.1V

0.3V

-15.2V

14.6V

2.0

2.0V

9.0V

1.9V

V

6.6V

2.5V

2.4
V

R493

1/2W

MAIN
PWB
CN00T

3

IC401

1

CRT SOCKET

CRT SOCKET PWB ASS’Y

SCH-1041A-CK
(

AV-21L81B-VT

SCH-1044A-CK
(

AV-25L81B-VT

TO
CRT

R541

1/2W

PICTURE TUBE

)

)

MAIN PWB ASS’Y(2/2

SCH-1041A-CK(AV-21L81B-VT
SCH-1044A-CK(AV-25L81B-VT

2.2

1.8

R591

2.2k

4.7k

)

k
k

k

2.2
k

1.8

2.2 4.7

3.9

DIFFERENCE LIST(PARTS

SCH-1044A-CK

134.2V

Q521

2Vp-p(H

26.6V

0V

27.7V

0V

B

)

Q522

B

2.4Vp-p(H

0.6V

T551 T551

)

150Vp-p(H

0V

0V

6

)

150Vp-p(H

7

)

20.6V

-0.1V

T551

25Vp-p(H

FOR ADJ.
CONNECTOR

134.2V

133.8V

0V

4

)

T551

90Vp-p(H

8

)

T551

1140Vp-p(H

10

)

5.0V

0V

)

C

)

Q521

45Vp-p(H

)

9

T551 T551

)

8Vp-p(H

96Vp-p(H

2

)

)

2.2

1.8

820

0.15

0.22

6.8
12

F/250V

k
k

1k

k

390

k

120

F/250V

1 F/250V

QQLZ034-430
QQLZ034-240

NOT USEDSCH-1041A-CK

120k 2.7

F

0.006

/1.5kVH

0.0045

/1.5kVH

CE40203-00CJ1

5.6

F F/250V

/1.5kVH0.0047

F/

1.5kVH

0.011F

2.2

4.7

R493
22k
33k

F/100V

/250V

33
47

100 F/160V
220 F/160V

27
82

270 /1W
270 /2W 0.47 0.47

100 F/160V
220 F/160V200 F/35V

1.21.2

Y956Y955V01L01K953DY01CP952T551T521L524L523L480D956

BWNOT USEDA51LSH196XQQW0118-001NOT USEDQQD0044-001NOT USEDQQH0104-001QQR1005-002QQLZ016-821RU3AM-LFC4SCH-1041A-CK

NOT USEDBWA60LST196XQQW0119-001QQR1214-001YQQH0043-001ICP-N50-YQQH0097-001QQR1229-001QQR1137-005QQR1138-00131DF6N-FC5SCH-1044A-CK

R541
150k
120k

R542R529R528R526R524R494R414R413R374R373R369R364R354
150k
120k

D953D522D521C960C956C955C592C529C528C525C524C353R593R592

NOT USEDRU3AM-LFC4ERB06-15-F1NOT USEDNOT USEDSCH-1041A-CK

RGP10J-5025-T331DF6N-FC5RH3G-F1470pF/500VSCH-1044A-CK

DEF YOKE

NOTE

: OPTION(NON MOUNT

X

: BUS WIRE

BW

: NRSA02J-0R0X

0

: 2SC2412K/QR/-X

1

: 2SA1037AK/QR/-X

2

: MA111-X

3

)

No.51903 No.51903

2-7 2-8

PATTERN DIAGRAMS

MAIN PWB PATTERN

AV-21L81B
AV-25L81B AV-25L81B

AV-21L81B

B1

()

()

FRONT

No.51903 No.51903

2-9 2-10

CRT SOCKET PWB PATTERN

AV-21L81B
AV-25L81B

TOP

()

No.51903

2-11

VICTOR COMPANY OF JAPAN, LIMITED

HOME AV NETWORK BUSINESS UNIT 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan

AV21L81BVTCK #4
AV25L81BVTCK #4

Printed in Japan
VP0109
SW