JVC AV-20420/SA, AV-20421/SA Schematics
AV-20420
AV-20421
AV-20420
AV-20421
AV-20420
/SA
, AV-20421
/SA
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 manufac tures recommended parts.
2.SPECIFIED VOLTAGE AND WAVEFORM VALUES
The voltage and waveform values have been measured under the
following condit ions.
(1)Input signal : Colour bar signal
(2)Setting positions of
each knob/button and
variable resistor
(3)Internal resistance of tester
(4)Oscil loscope sweeping time
(5)Volt age values
Since the v oltage values of si gnal 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.INDICATION OF PARTS SYMBOL [EXAMPLE]
In the PW board
:R1209
R209
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value
No unit :[
K
M
Rated allowa ble power
No indication :1/ 16 [W]
Others :As specified
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 tha n 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]
]
:[k
]
:[M ]
:Carbon resistor
:Oxide metal film resistor
:Metal film resistor
:Metal plate resistor
:Uninflammable resistor
:Fusible resistor
:[µF]
:AC withstand voltage [V]
Type
No indication
MM
PP
MPP
MF
TF
BP
TAN
(3) Coils
No unit
Others
(4)Power Supply
Respective voltage values are in dicated
(5) Tes t poi nt
:T est point
(6)Connecting method
(7)Ground symbol
:LIVE side ground
:ISOLA TED(NEUTRAL) side gr ound
:EARTH ground
:DIGITAL ground
5.NOTE FOR REPAIRING SERVICE
This mode l's p ower circu it is p artly diff erent 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 point s.
(1)Do not touch the LIVE side GND or the LIVE side GN D an d 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
circ ui t constant s may be subject to c hange for impro vem ent
without any notice.
NOTE
Due improvement in performance, some part numbers show
in the circuit diagram may not agree with those i ndicate d in
the part list.
When ordering parts, please use the numbers that appear
in th e Parts List .
No.52111
:Ceramic capacitor
:M eta lized my lar capa ci to r
:Polypropylen e capacitor
:Metalized polypropylene capacitor
:Metalized film ca pacitor
:Thin film capacitor
:Bipolar electrolytic capacitor
:Tantalum capacitor
µ
:[
H]
:As specified
:B1
:9V
:Only test point displ ay
:Connector
:Receptacle
:Wrapping or soldering
:B2 (12V)
:5V
CONTENTS
SEMICONDUCTOR SHAPES ......................................................................2-2
BLOCK DIAGRAM........................................................................................2-3
CIRCUIT DIAGRAMS....................................................................................2-5
MAIN PWB CIRCUIT DIAGRAM ................................................................................................................ 2-5
PATTERN DIAGRAMS .................................................................................2-9
MAIN PWB P ATTERN ................................................................................................................................ 2-9
CHANNEL CHART (US)..............................................................................2- 11
CHANNEL CHART (CA)............................................................................. 2-12
SEMICONDUCTOR SHAPES
TRANSISTOR
BOTTOM VIE W
E
C
B
ECB
BCE
(G)(D)(S)
FRONT VI EW
ECB
ECB
IC
BOTTO M V IEW FRONT VI EW TOP V IEW
OUT
E
IN
IN OUTE
1 N
1 N
CHIP IC
TOP VIEW
N
N
2-22-1
N
1
N
No.52111
1
N
TOP VIEW
CHIP TR
1
C
BE
N
BLOCK DIAGRAM
AV-20420
AV-20421
A V-20420
A V-20421
AUDIO
VARI.OUT
IC602
AUDIO AMP
RL
L
1 13 6
L
R
SP
OUTIN
R
8
L
R
32
SDA
34
SCL
YS B G R
39 40 41 42
KEY
MICRO COMPUTER
& CLOSE CAPTION DECODER
LED
IC701
17
REMOCON
RECEIVER
IC702
MEMORY
R / G / B
RGB
OUT
CRT SOCKET
V01
CRT
PWB
MPX
79
IC651
MTS&TONE CONTROL
VARI.OUT IN
RL RL
2625 3938
Q161
BUFFER
41
CF161
4.5 FILTER
Q361
BUFFER
SIF
54
52 47
45
C
VC
C
Y
41
TV.V DET
Q271
BUFFER
Q201
Q202
BUFFER
VIDEO
43
Y
IC201
1CHIP DECODER
39
BGR
Q131
BUFFER
CF131
4.5 TRAP
Q132
BUFFER
2221201987
37
TV.V
VD
32
HD
Q521
H.DRIVE
IC421
V.OUT
Q522
H.OUT
24
V
H
DEF YOKE
T522
FBT
HB
HEATER
X-RAY
HV
FOCUS
SCREEN
INPUT
VIDEO
AUDIO
Q101
IF
L
R
TUNER
IF AMP
SF101
F901
RY901
D911
RECT
F902
IC921
POWER
REGULATOR
B1
MAIN PWB
No.52111 No.52111
2-3 2-4
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