JVC AV-20N14, AV-20NMG4/G, AV-20NMG4/S Schematics

SCHEMATIC DIAGRAMS

COLOUR TELEVISION

YA160200412

AV-20N14,

AV-20NMG4/G,

AV-20NMG4/S

CD-ROM No.SML200412

BASIC CHASSIS

No.YA160

2004/12

AV-20N14,AV-20NMG4/G,AV-20NMG4

STANDARD CIRCUIT DIAGRAM

NOTE ON USING CIRCUIT DIAGRAMS

1.SAFETY

The components identified by the symbol and shading are critical for safety. For continued safety replace safety ciritical 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

(3)Internal resistance of tester

(4)Oscilloscope sweeping time

(5)Voltage values

Since the voltage values of signal circuit vary to some extent according to adjustments, use them as reference values.

: Original setting position when shipped

: DC 20kΩ/V

: H

: V

: Othters

: All DC voltage values

20µs / div

5ms / div

Sweeping time is specified

3.INDICATION OF PARTS SYMBOL [EXAMPLE]

In the PW board

: R209

R209

Type

No indication

MM PP MPP

MF TF BP

TAN

(3)Coils

No unit

Others

(4)Power Supply

Respective voltage values are indicated

(5)Test point

: Test point

(6)Connecting method

: Ceramic capacitor : Metalized mylar capacitor

: Polypropylene capacitor : Metalized polypropylene capacitor : Metalized film capacitor : Thin film capacitor : Bipolar electrolytic capacitor : Tantalum capacitor

: [µH]

: As specified

: B1

: 9V

: Connector

: Receptacle

: Only test point display

: Wrapping or soldering

: B2 (12V

: 5V

)

4.INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

Resistance value

No unit : [Ω]

K M

Rated allowable power No indication : 1/16 [W]

Others : As specified

Type

No indication

OMR

MFR

MPR

UNFR

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

(2)Capacitors

Capacitance value

1 or higher : [pF]

less than 1

Withstand voltage

No indication : DC50[V]

Others : DC withstand voltage [V]

AC indicated Electrolytic Capacitors

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

: [kΩ]

: [MΩ]

: Carbon resistor

: Oxide metal film resistor

: Metal film resistor

: Metal plate resistor

: Uninflammable resistor

: Fusible resistor

: [µF]

: AC withstand voltage [V]

(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 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 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.YA160)2-1

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

USING P.W.BOARD .......................................................................................................................................................2-2

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

CIRCUIT DIAGRAMS

MAIN PWB CIRCUIT DIAGRAM [AV-20N14] (1/3) .......................................................................................................... 2-5

MAIN PWB CIRCUIT DIAGRAM [AV-20N14] (2/3),(3/3) ................................................................................................. 2-7

MAIN PWB CIRCUIT DIAGRAM [AV-20NMG4/G,AV-20NMG4/S] (1/3)........................................................................ 2-9

MAIN PWB CIRCUIT DIAGRAM [AV-20NMG4/G,AV-20NMG4/S] (2/3),(3/3)............................................................. 2-11

PATTERN DIAGRAMS

MAIN PWB PATTERN ...................................................................................................................................................... 2-13

VOLTAGE CHARTS ...................................................................................................................................................... 2-15

WAVEFORMS ................................................................................................................................................................... 2-16

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM VIEW FRONT VIEW TOP VIEW

CHIP TR

E C B

ECB

(G)E(S)C(D)

ECB

BOTTOM VIEW FRONT VIEW TOP VIEW

OUT

IN OUTE

1 N

CHIP IC

TOP VIEW

USING P.W.BOARD

P.W. BOARD ASS'Y NAME

MAIN P.W. BOARD

AV-20N14

SCW-1323A-H2

AV-20NMG4/G

SCW-1324A-H2

AV-20MNG4/S

SCW-1325A-H2

2-2(No.YA160)

BLOCK DIAGRAM

VIDEO-1

INPUT

VIDEO-2

INPUT

(FRONT)

J801

VIDEO-1

AUDIO-1

J806,J807

VIDEO-2

AUDIO-2

MAIN PWB

IC701 MAIN MICRO COMPUTER/

IF.VIDEO.RGB.SYNC.DEF. PROCESS

108,109

SCL SDA

TU001

TUNER

IC702

MAIN MEMORY

SF101

SAW FILTER

SF102

SAW FILTER

127,128

98,99

119

29, 30

24, 25

SCL1, SDA1

SCL0, SDA0

PW_LED

REMOTE

KEY_IN

SIF IN

VIF IN

SIF DETECT

VIF DETECT/AGC/AFT

SOUND TRAP

VIDEO

SELECT

I2C

BUS

I/O

PORT

MICRO

COMPUTER

VIDEO

IDENT.

COMB FILTER Y DELAY ADJ.

COLOUR

DEMOD

DIGITAL SIGNAL PROCESS

PEAKING SCAN

VELOCITY MOD.

U/V DELAY

SKIN TONE

U/V TINT

SATURATION

B-Y R-Y

BASE-BAND DELAY LINE

SYNC

SEP.

RRGGB

RGB MATRIX

GAMMA

V. DRIVE

H. DRIVE

ROUT

GOUT

BOUT

OSD SELECT

VDRA+,VDRB-

HOUT

22, 23

IC351

RGB OUT

MAIN PWB (CRT SOCKET)

J809

HEADPHONE

V01

OUTPUT

J802

VIDEO_OUT

AUDIO_OUT

AC IN

V_OUT

L_OUT

REMOCON RECEIVER

VOL+

VOL- CH+ CH- MENU

S901

POWER SW

F901

POWER

LED

AUDIO

SELECT

AUDIO

VOUT

LOUT

SELECT

D901 RECT

IC921

POWER

REG

AUDIO

CONTROL

TRANSF.

T921

A_L

IC972

3.3V REG

IC975

5V REG

IC973

12V REG

IC601

AUDIO AMP

IC974

1.8V REG

IC976

1.8V REG

L951

3.3V_STB

1.8V

V1.8V

12V

32V

T522

FBT

IC401

V. OUT

H. OUT

FOCUS

SCREEN

EHV

Q522

SPEAKER

DEF YOKE

DY01

2-4(No.YA160)(No.YA160)2-3

+ 8 hidden pages

JVC AV-20N14, AV-20NMG4/G, AV-20NMG4/S Schematics

STANDARD CIRCUIT DIAGRAM

CONTENTS

SEMICONDUCTOR SHAPES

USING P.W.BOARD

BLOCK DIAGRAM