JVC AV-25KX3B, AV-25KX3B/S Schematics

SCHEMATIC DIAGRAMS

COLOUR TELEVISION

AV-25KX3B
AV-25KX3B

CD-ROM No. SML200312

/S

BASIC CHASSIS

CH3

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.

No.52190

2003/11

AV-25KX3B, AV-25KX3B/S

STANDARD CIRCUIT DIAGRAM

! !

!

! !

NOTE ON USING CIRCUIT DIAGRAMS

1. SAFETY

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

!!

! symbol and shading are critical

!!

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

(3) Internal resistance of tester : DC 20kΩ/V
(4) Oscilloscope sweeping time : H ⇒ 20µs/div

(5) Voltage values : All DC voltage values

: Original setting position when

shipped

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

specified

∗Since the voltage values of signal circuit vary to some extent

according 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

∗Respective 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 : [Ω]
k:[kΩ]
M:[MΩ]
Rated allowable power

•

No indication : 1/16 [W]
Others : As specified
Type

•

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

∗Composition 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]

∗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 the LIVE side
GND and ISOLATED(NEUTRAL) side GND at the same time with
a measuring apparatus ( oscilloscope, etc.). 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
circuit constants may be subject to change for improvement
without any notice.

NOTE

♦

Due improvement in performance, some part numbers show
in the circuit diagram may not agree with those indicated in
the part list.
When ordering parts, please use the numbers that appear in
the Parts List.

(No. 52190) 2-1

CONTENTS

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

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

CIRCUIT DIAGRAMS

MAIN PWB CIRCUIT DIAGRAM (1/3) ............................................................................................................................. 2-5

MAIN PWB CIRCUIT DIAGRAM (2/3) ............................................................................................................................. 2-7

MAIN PWB (CRT SOCKET) CIRCUIT DIAGRAM (3/3) ............................................................................................... 2-8

FRONT CONTROL PWB CIRCUIT DIAGRAM .............................................................................................................. 2-9

PATTERN DIAGRAMS

MAIN PWB PATTERN ...................................................................................................................................................... 2-11

FRONT CONTROL PWB PATTERN .............................................................................................................................. 2-13

VOLTAGE CHART ........................................................................................................................................................ 2-14

WAVEFORMS .................................................................................................................................................................. 2-15

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. 52190)

CONTROL

J801

VIDEO-1

INPUT

T551

FBT

B1

FOCUS1

IC702

MEMORY

TU001

TUNER

VIDEO

Y

in

1

V1-V

V1-L

V1-R

V2-Y

V2-C

V2-V

V2-L

V2-R

V3-V

V3-L

V3-R

Vout2

Lout2

Rout2

AUDIO L/MONO

AUDIO R

IF

IC351

RGB OUT

SCL
SDA

MAIN PWB
(CRT SOCKET)

IC401

VERT OUT

J802,J803

COMPONENT

(VIDEO-2)

INPUT

C

B

C

R

AUDIO R

J801-J803
FRONT IN
(VIDEO-3)

VIDEO

AUDIO L/MONO

AUDIO R

J804

OUTPUT

AUDIO L

AUDIO R

VOL+

REMOCON
RECEIVER

VOL- CH+ CH- MENU

Q522

H. OUT

SCREEN

EHV

V

H

DY01

DEF YOKE

SPEAKER

L

SPEAKER

R

V/Y

AUDIO L/MONO

VIDEO OUT

SF101

SAW FILTER

SF102

SAW FILTER

CF106

TRAP

Q111

BUFFER

C

B

C

R

Q109

BUFFER

IC650

AUDIO OUT

AC IN

F901

POWER SW

D901
RECT

T901

SW

TRANSF.

IC974

REG

L951

STB

5V

5V

8V

9V

32V

IC951

ERROR

AMP

PC901

VOLTAGE

FEEDBACK

IC901

POWER

REG

MAIN PWB

FRONT CONTROL PWB

28, 29

5,6

R

G

B

7

12

5

2

KEY_IN

REMOTE, LED

S901

IC972

3.3V REG

STB3.3V

J770

HEADPHONE

V01

SCL
SDA

1

30

1, 7

8

23

5

29,30

15

14

13

23

26

24

25

19

27

10

8

7

SCL,SDA

Yout1

Cout1

MTV-V

MTV-L

MTV-R

Vout1

Lout1

Rout1

3

5

1

4

2

37

36

35

43

44

42

47

48

46

42

43

62,63

7

10,64

2,3

23, 24

51

52

53

21,22

33

38

35

IC801

VIDEO/AUDIO SW

IC701 MAIN MICROCOMPUTER, TELETEXT DECODER,
VIDEO/SYNC/DEF PROCESSOR

VOL1

VOL1

TONE VOL2

TONE VOL2

SURROUND

PROCESS

I2C

IC602 AUDIO CONTROL

CF142

6.5 FILTER

CF140

5.5 FILTER

CF141

6.0 FILTER

Q137

BUFFER

Q136

BUFFER

IC130

SOUND

DETECT

CF130

4.5 FILTER

Q132

BUFFER

Q130

BUFFER

POWER

LED

SUB POWER

LED

L,R 11 10

SIF IN

IF IN

U

V

Y

CVBS
/YIN

KEY IN

SCL,
SDA

SCL1,
SDA1

REMOTE,
LED OUT

VIDEO

IDENT.

VIDEO

FILTER

PAL/

SECAM/

NTSC

DECODER

TELETEXT

ACQUI.

CHARA.

GEN.

RGB

MATRIX

OSD

INSERT

SYNC

SEP.

VIDEO

DETECT

QSS

SOUND

I2C
I/O

PORT

CPU

ROM

RAM

QSS OUT

IF VOUT

ROUT

GOUT

BOUT

HOUT

VDRA,

VDRB

V.DRIVE

H.DRIVE

U

V

Y

CIN

40

R
G
B

GBR

YUV

SELECT

BLOCK DIAGRAM

No. 52190

2-3 2-4

No. 52190