JVC AV-21D41/BK, AV-21D71/VT Schematics

SCHEMATIC DIAGRAMS

COLOUR TELEVISION

AV-21D41 AV-21D71

AV-21D41/BK AV-21D71/VT

CD-ROM No.SML200112

BASIC CHASSIS

CONTENTS

NOTE ON USING CIRCUIT DIAGRAMS SEMICONDUCTOR SHAPES BLOCK DIAGRAM CIRCUIT DIAGRAMS PATTERN DIAGRAMS

2-1 2-2 2-3 2-5 2-13

No.51925

Nov. 2001

AV-21D41

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 follo win g c onditions.

(1)Input signal : Colour bar signal

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

(3)Internal resistance of test er

: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 th e vo l tage val ue s of si gn a l cir cui t va ry to some ex ten t 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 DIAG RAM

(1)Resistors

Resistance value No unit :[

]

:[K

]

Rated allowable power No indicatio n :1/ 16 [W] Others :As specified

Type No indicatio n

:Carbon resistor

OMR

:Oxide metal film resistor

MFR

:Metal film resistor

MPR

:Metal plate resistor

UNFR

:Uninflammable resistor

:Fusible resistor

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

(2)Capacitors

: Original setting position when shipped

5.N OT E FOR RE PAIRIN G 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 no t 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 circ uit con stant s may be subj ect to chan ge f or i mprovem ent without any not ic e.

NOTE Due improvement in performance, some part numbers show in the circuit diagram may not agree wi th those i ndicated in the part list. When ordering parts, pl ease use t he numbers t hat appear in the Parts List.

Type

:M eta lized mylar cap ac i tor

:Polypropylene capacitor

MPP

:Metalized polypropylene capacitor

:Metalized f ilm capacitor

:Thin film capacitor

:Bipolar electrolytic capacitor

TAN

:Tantalum capacitor

(3)Coils

No unit

Others

:As specified

(4)Power Supply

:B1

:9V

:5V

Respective voltage values are indicated

(5)Test point

:T est point

: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 value

1 or higher :[pF]

less than 1

:[µF] Withstand voltage No indication :DC 50[V]

Others :DC withstand voltage [V] AC indicated

:AC withstand voltage [V]

Electrolytic Capacitors

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

No indication

:Ceramic capacitor

:B2 (12V)

AV-21D71

CONTENTS

AV-21D41 AV-21D71

SEMICONDUCTOR SHAPES

BLOCK DIA GRAM CIRCUIT DIAGRAMS

MAIN PWB CI RCUIT DIAGRA M

P ATTERN DIAGRAMS

MAIN PWB & CRT SOCKET PATTERN

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM VIE W

E C

ECB

BCE

(G)(D)(S)

B O TT OM VI EW F R O NT VIEW TO P VI EW

CHIP IC

2-2

OUT E IN

IN OUTE

FRONT VI EW

1 N

TO P VI EW

ECB

No.51925

TO P VI EW

CHIP TR

ECB

1 N

2-2 2-3

2-5

2-13

Nov. 2001 No. 51925

BLOCK DIAGRAM

Q102

IF AMP

SF101

VIDEO

AUDIO

IC701

MICRO COMPUTER

IC201

1 CHIP DECODER

RGB

10.11.12

MAIN PWB

IC702

MEMORY

IC651

AUDIO AMP

AUDIO

OSD RGB

SF102

SCL/SDA

IC421

VERT.OUT

Q522

H.OUT

DY(V)

DY(H)

DEF.YOKE

H.OUT V .OUT

H.OUT

V .OUT

SCL SDA

POWER SW

OUT

AC IN

Q103

HEAD

PHONE

CF901

30.31.32

SAW

EXT

RGB

TU001

TUNER

T921

TRANSF.

IC921

POWER

REG.

PC921

VOLTAGE

FEEDBACK

IC941

ERROR

AMP

IC971

5/9V REG.

REG.

D901

RECT

R / G /B

V01

CRT

CRT SOCKET

PWB

RGB DRV

ECO

REMOCON

KEY

IND.

VIDEO

AUDIO

T522

HVT

FOCUS

SCREEN

EHV

18.19

3.58/ OTH

37.38

6.7.8

VIDEO

OUT

AUDIO

OUT

SCL SDA

OUT

VIDEO

AUDIO

REAR

FRONT

AV-21D41 AV-21D71

No.51925

2-3 2-4

No.51925

+ 6 hidden pages