JVC AV-21F9(NS) Schematics

SCHEMATIC DIAGRAMS

COLOUR TELEVISION

AV-21F9(NS)

AV-21F9

AV-21F9

++−

−

COPYRIGHT  2000 VICTOR COMPANY OF JAPAN, LTD.

No. 56037 2-1

No. 56037
Aug. 2000

AV-21F9

2-2 No. 56037

STANDARD CIRCUIT DIAGRAM

AV-21F9

■ NOTE ON USING CIRCUIT DIAGRAMS

1. SAFETY

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

2. SPECIFIED VOL T AGE AND W AVEFORM 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

* 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

4. INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

● Resistance value
No unit : [Ω]
K: [KΩ]
M : [MΩ]

● Rated allowable power
No indication : 1/4 [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

* 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]

!!

! symbol and shading are

!!

: Original setting position when
shipped

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

specified.

● 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
: 12V
: 9V
: 5V

* Respective voltage values are indicated.

(5)Test point

: Test 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

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 ISOLA TED (NEU-

TRAL) 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
circuit constants may be subject to change for improvement
without any notice.

No. 56037 2-3

AV-21F9

CONTENTS

SEMICONDUCTOR SHAPES ........................................................... 2-4

BLOCK DIAGRAM ............................................................................ 2-5

CIRCUIT DIAGRAMS

MAIN PWB CIRCUIT DIAGRAM............................................................................................... 2-7

AV SW PWB CIRCUIT DIAGRAM ............................................................................................ 2-9

IF PWB CIRCUIT DIAGRAM................................................................................................... 2-11

CRT SOCKET PWB CIRCUIT DIAGRAM .............................................................................. 2-13

FRONT CONTROL PWB CIRCUIT DIAGRAM....................................................................... 2-15

PATTERN DIAGRAMS

FRONT CONTROL PWB PATTERN ....................................................................................... 2-16

MAIN PWB PATTERN ............................................................................................................. 2-17

AV SW PWB PATTERN........................................................................................................... 2-19

IF PWB PATTERN ................................................................................................................... 2-20

CRT SOCKET PWB PATTERN............................................................................................... 2-21

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM VIEW

E
C
B

IC

BOTTOM VIEW

OUT
E
IN

CHIP IC

E

CB

IN E OUT

B

(G)C(D)E(S)

FRONT VIEW

1N

TOP VIEW

TOP VIEW

CHIP TR

C

E

CB

E

CB

1N

BE

TOP VIEWFRONT VIEW

1N

N

N

N

1

N

2-4 No. 56037

1

N

BLOCK DIAGRAM

AV-21F9 AV-21F9

IN

S/VIDEO-1

IN

VIDEO-2

S1

V1

L1

R1

V2

L2

R2

43

YC

Q101

IF AMP

TU001

IF PWB

IF

SF101

IC101
PIF/SIF/DET .

4

V.IN

5

V.IN

Q151

BUFFER

V.OUT

SIF

OUT

18

13

Q104

BUFFER

Q109

BUFFER

IC702
MEMORY

CF103

4.5

TRAP

CF106

6.0

TRAP

IC701
MICRO COMPUTER

Q103

BUFFER

CF104 5.5
CF105 6.5

TRAP

Q107

BUFFER

OSD

TV.V

IC201

V/C DEF.

PROCESSOR

MAIN PWB

42

C
Y

45

RGB

12 13 14

IC681 AUDIO AMP

L

R

113

L

R

6

8

D901

CONTROL
PWB

ECO SENSOR

KEY

IND.

POWER

FRONT

HEAD-

PHONE

FRONT

IN

VIDEO-3

V

L

R

SP01

L

SP02

R

AC IN

V

1

L

2

IC604

ALC

SF101

SF102

3

8

R

4

7

8

10

Y

C

9

11

13

TV.L

TV.R

TV.V

C.OUT

Y.OUT

L.OUT

R.OUT

48
46

47

45

43

39

38

SIF

Q101

SIF AMP

(L)

(R)

1

10

5

IC101
P.IF / S.IF

6

SELECTOR

1

19

IC601

SURROUND

Q105-Q107

17

3 (L) 11

5 (R) 6

AMP

58

IC602

VOL & TONE

SIF

60

MULTI SOUND

PROCESSOR

17 (L)

16 (R)

14

40

16

V.OUT

IC301

COMB FILTER Y/C SW

Q302

BUFFER

IC501

LR

34 33

TO REG.

B1

L

R

T921

R / G /B

RGB OUT

Q351
Q352
Q353

V01

CRT

CRT SOCKET

PWB

LINE
OUT

V

L

R

29

28

26

C.IN

IC401
VIDEO SW

Y.IN

35
37

10 11 125 7 8

AV SW PWB

NTSC COMB
FILTER

3 5

C.OUT

Y.OUT

V.IN

2

DL301

No. 56037 No. 560372-62-5