JVC AV-20N81-BK, AV-21D81-BK Schematics

SCHEMATIC DIAGRAMS

COLOUR TELEVISION

AV-21D81 AV-20N81

AV-21D81/BK AV-20N81/BK

CD-ROM No.SML200112

BASIC CHASSIS

CL-M

[AV-20N81/BK]

CONTENTS

NOTE ON USING CIRCUIT DIAGRAMS

SEMICONDUCTOR SHAPES

BLOCK DIAGRAM

CIRCUIT DIAGRAMS

PATTERN DIAGRAMS

[AV-21D81/

BK]

2-1

2-2

2-3

2-5

2-13

No.51891

Dec. 2001

AV-21D81

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 critical components only with manufactures recommended parts.

2.SPECIFIED VOLTAGE AND WAVEFORM VALUES

The voltage and waveform values have been measured under the foll owin g condition s.

(1)Input signal : Colour bar signal

(2)Setting positions of each knob/button and variable resistor

(3)Internal resistance of tester

:DC 20k

(4)Oscil loscope sweeping time

20µS/div

5mS/div

:Others

Sweeping time is specified

(5)Voltage values

:All DC voltage values

Sin ce the voltage values of si gnal 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

4.INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

Resistance value

No unit :[

]

:[K

]

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

Others :As specified

Ty pe

No indication

:Carbon resistor

OM R

:Oxi de metal film resi stor

MFR

:Met al film resi stor

MPR

:Metal plate resistor

UNFR

:Uninflammable resistor

:Fusible resistor

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

(2)Capacitors

: Original setting position when shipped

5.NOTE FOR REPAIRING SERVICE

This model's power circuit is partly different in the GND. The difference of the GND is s hown 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 e xample, 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 a ny n otice.

NOTE Due improvement in performance, some par t numbers show in th e ci rcuit dia gram may not agree wi th those indicated i n the part list. When ordering parts, please use the numbers that appear in the Part s List .

Ty pe

:Metalized mylar capacitor

:Polypropylene capacitor

MPP

:Metalized polypropylene capacitor

:Metalized film capa citor

:Thin film capacitor

:Bipolar electrolytic capacitor

TAN

:Tantalum capacitor

(3) Coi ls

No unit

Others

:As specified

(4)Power Supply

:B1

:9V

:5V

Respective voltage values are indicated

(5)Test point

:Test p oint

:Only test point display

(6)Connecting method

:Connector

:Wrapping or soldering

:Receptacle

(7)Ground symbol

:LIVE side ground

:ISOLATED(NEUTRAL) side ground

:EARTH ground

:DIGITAL ground

:[M ]

Capacitance valu e

1 or higher :[pF]

less than 1

:[µF] Withstand voltage No indication :DC50[V]

Others :DC withstand voltage [V]

AC indicated

:AC withstand voltage [V]

Electrolytic C apacitors

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

No indication

:Ceramic capacitor

:B2 (12V)

AV-20N81

CONTENTS

AV-21D81 AV-20N81

SEMICONDUCTOR SHAPES

BLOCK DIAGRAM CIRCUIT DIAGRAMS

MAIN PWB CIRCUIT DIAGRAM(Tuner,Micro computer & Front control ) MAIN PWB(Picture & Audio) & CRT SOCKET PWB CIRCUIT DIAGRAM MAIN PWB CIRCUIT DIAGRAM(Power & Deflection) A2 PWB CIRCUIT DIAGRAM

PATTERN DIAGRAMS

MAIN PWB PATTERN CRT SOCKET PWB PATTERN A2 PWB PATTERN

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM V IEW

BOTTOM VIEW FRONT VIEW TOP VIEW

CHIP IC

2-2

E C

OUT E

ECB

IN OUTE

BCE

(G)(D)(S )

FRONT VI EW

1 N

TOP VIEW

ECB

No.51891

TOP VIEW

CHIP TR

ECB

1 N

2-2

2-3

2-5 2-7 2-9 2-11

2-13 2-15 2-16

Dec. 2001 No. 51891

BLOCK DIAGRAM

CF601, 602

5.74 MHz

TUNER

Q101

AMP

A2 PWB

SAW FILTER

SF101

SAW FILTER(PAL)

SF102

Q 102

V-IN

S-IN

DETECTOR

FM OUT

IC101

P.IF/S.IF

Q208

BUFFER

V-OUT

VCC

SIF OUT

SIF IN

AV-21D81 AV-20N81

(V)

1110

CF106

6.0 TRAP

T101

(A)

CF604

5.5MHz FILTER

VCO (CW)

AV-21D81 AV-20N81

CF103

4.5MH

CF104, 105

5.5/6.5 TRAP

CF606

6.0MHz FILTER

Q604

SIF AMP

(A)

CF601

4.5 TRAP

Q107

BUFFER

CF608

6.5MHz

FILTER

IC680 AUDIO AMP

1 13

REMOCON RECEVER

ECO SENSOR

KEY

VIDEO-1

V 1

LINE OUT

IC601

A2 DET

IC602

LED

TV IN

R G B

IC702 MEMORY

SCL SDA

IC701

MICRO

COMPUTER

OSD

SCL SDA

IC201 V/C DEF. PROCESSOR

V-OUT

56 1

V-IN

OUT

4 53 141312

ENA,DATA,CLOCK,LOCK

V01

CRT

FRONT IN VIDEO-3

(L/R)

IC601

(L)

SURROUND

(R)

IC202

AUDIO SW

L.IN

R.IN

L.OUT

R.OUT

RF-IN

D901

RECT

(L)

(R)

SCL SDA

T921

TRANSF.

IC602

VOL&TONE

P SW

(V)

Q971

LOW-B SW

IC941

ERROR AMP

(L)

(R)

REG.

H.OUT

Q522

H.OUT

V.OUT

IC421

VERT.OUT

R / G /B

FOCUS

VIDEO

AMP

CRT SOCKET

PWB

SCREEN

FBT

EHV

DY(V)

AC IN

IC921

POWER

REG.

PC921

VOLTAGE

FEEDBACK

MAIN PWB

DY(H)

DEF.YOKE

No.51891

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No.51891

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