JVC AV-21KT1BEF/A /B, AV-21KT1BNF/A /B, AV-21KT1BPF/A /B, AV-21KT1SEF/A /B, AV-21KT1SNF/A /B Schematics

AV-21KT1BEF

/A, /B

, AV-21KT1SEF

/A, /B

AV-21KT1BNF
AV-21KT1BPF

/A, /B

, AV-21KT1SNF

/A, /B

, AV-21KT1SPF

/A, /B

/A, /B

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
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 20k

:H

:V

:Others

:All DC voltage values

/V

20µS/div

5mS/div

Sweeping time is
specified

3.INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

Resistance value

No unit :[

K
M

Type

No indication

OMR

MFR

MPR

UNFR

FR

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

(2)Capacitors

Capacitance value

1 or higher :[pF]

less than 1

]

]

:[K

:[M ]

:Carbon resistor

:Oxide metal film resistor

:Metal film resistor

:Metal plate resistor

:Uninflammable resistor

:Fusible resistor

:[µF]

Withstand voltage

No indication :DC50[V]

Others :DC withstand voltage [V]

AC indicated

Electrolytic Capacitors

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

Type

No indication

MM
PP
MPP
MF
TF
BP

TAN

(3)Coils

No unit

Others

:AC withstand voltage [V]

4.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.

:Ceramic capacitor
:Metalized mylar capacitor

:Polypropylene capacitor
:Metalized polypropylene capacitor

:Metalized film capacitor
:Thin film capacitor

:Bipolar electrolytic capacitor

:Tantalum capacitor

µ

:[

H]

:As specified

No.52134

Oct. 2003 No. 52134

2-1

CONTENTS

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

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

CIRCUIT DIAGRAMS .................................................................................... 2-5

MAIN PWB CIRCUIT DIAGRAM ............................................................................................................... 2-5

FRONT AV PWB CIRCUIT DIAGRAM .................................................................................................... 2-19

HEADPHONE PWB CIRCUIT DIAGRAM ............................................................................................... 2-20

PATTERN DIAGRAMS ................................................................................ 2-21

MAIN PWB PATTERN ............................................................................................................................. 2-21

FRONT AV PWB PATTERN ..................................................................................................................... 2-23

HEADPHONE PWB PATTERN................................................................................................................ 2-24

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM VIEW FRONT VIEW TOP VIEW

CHIP TR

E
C
B

ECB

B

(G)E(S)C(D)

ECB

ECB

C

BE

IC

BOTTOM VIEW FRONT VIEW TOP VIEW

OUT
E

IN

IN OUTE

1 N

1 N

CHIP IC

TOP VIEW

N

N

N

1

N

1

N

1

N

2-2

No.52134

BLOCK DIAGRAM

TU201

PLL/VST TUNER

I2 C

IC700

STEREO SOUND

L

R

L

IC301(STEREO)
IC401(MONO)

AUDIO AMP

R

IC701

HP AMP

SERVICE

CONNECTOR

IC500

EEPROM

(MEMORY)

KEYPAD

IR

SENSOR

IC501

CONTROLLER

+115V B+

QSS

IF

IC403

VIDEO PROCESSOR

VIDEO

SWITCHING

MONO

IC900

RGB AMP

IC600

VER AMP

CRT

VER. DEFL.

AC IN

IC800
SMPS

+12V
+8V

CIRCUITS

Q603

HOR. DEFL.

HOR DRIVE

+5V

SVHS FAV

+5V STBY

SCART1

SCART2

No.52134 No.52134

2-42-3

TR601

FBT

CIRCUIT DIAGRAMS

MAIN PWB CIRCUIT DIAGRAM [1/6]

IC501

µ CONTROLLER

0V 0V 0V 0V

MEMORY

(EEPROM)

4.8V

4.8V 4.7V 4.6V

4.8V

1.6V

4.8V

4.8V

0.7V

0V

1.0V

4.8V

4.7V

4.6V

0.1V

0.1V

0.1V

0.3V

0V

0V

0.6V

0.6V

1.3V

0.4V

4.8V

4.7V

0.5V

1.4V

0V

0V

0V

1.8V

0.5V

4.5V

0V

0.4V

0.4V

0.7V

4.9V

0.1V

IC 501 40

6

2.5V 6.2V 0V 4.7V 0V 4.9V 4.9V 0V 26.9V 0V 0V

IC 501 41

4.5

MAIN PWB (1/6)

(µ CONTROLLER)

VE-20124223
VE-20124225
VE-20121220

(AV-21KT1BEF/A, AV-21KT1SEF/A)
(AV-21KT1BNF/A, AV-21KT1SNF/A)
(AV-21KT1BPF/A, AV-21KT1SPF/A)

4.8V4.8V

4.1V

VE-20133635
VE-20129865
VE-20129808

0.6V

3.6V

4.8V

0.2V

0.2V

0.2V

4.8V

4.8V

4.8V

4.5V

0.8V

1.1V

1.1V

1.3V

0.6V

4.8V

0V

0V

(AV-21KT1BEF/B, AV-21KT1SEF/B)
(AV-21KT1BNF/B, AV-21KT1SNF/B)
(AV-21KT1BPF/B, AV-21KT1SPF/B)

No.52134 No.52134

2-5 2-6

MAIN PWB CIRCUIT DIAGRAM [2/6]

IC403

VIDEO PROCESSOR

MAIN PWB (2/6)

(VIDEO PROCESSOR)

VE-20124223
VE-20124225
VE-20121220

VE-20133635
VE-20129865
VE-20129808

(AV-21KT1BEF/A, AV-21KT1SEF/A)
(AV-21KT1BNF/A, AV-21KT1SNF/A)
(AV-21KT1BPF/A, AV-21KT1SPF/A)

(AV-21KT1BEF/B, AV-21KT1SEF/B)
(AV-21KT1BNF/B, AV-21KT1SNF/B)
(AV-21KT1BPF/B, AV-21KT1SPF/B)

IC401

AUDIO AMP

(STEREO)

IC301

AUDIO AMP

(MONO)

7.2V

7.2V

14.5V

0V

0V

0V

0V

4.92V

4.7V

0V

1.3V

14.6V

7.3V

7.2V

IC 403 30

4

0V

0.6V

0V

4.8V

4.4V
0V

4.9V

0V

0V

IC 403 31

3

IC 403 32

4

IC 403 48

6

2.2V

7.8V

2.9V

2.4V

2.4V

4.3V

0V

0V

1.6V

3.1V

2.2V

2.4V

2.4V

2.6V

1.8V

0V

3.8V

4.9V

3.0V

2.3V

3.8V

3.8V

7.9V

3.6V

0V

3.1V

2.4V

3.1V

1.6V

0V

3.8V

0V

4.9V

4.6V

4.7V

4.0V

0.2V

2.5V

6.0V

5.5V

4.7V

3.1V

0V

4.3V

2.3V

0.1V

4.1V

4.2V

4.2V

5.1V

4.3V

IC 403 47

6

No.52134 No.52134

2-82-7

2.4V

1.6V

2.4V

0V

2.2V

2.3V

2.3V

4.3V