JVC AV-20FA44/SA, AV-N21A44/SA Schematics
AV-20FA44/SA, AV-N21A44/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 ciritical
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
: Othters
: 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
Type
No indication
MM
PP
MPP
MF
TF
BP
TAN
(3)Coils
No unit
Others
(4)Power Supply
Respective voltage values are indicated
(5)Test point
: Test point
(6)Connecting method
: Ceramic capacitor
: Metalized mylar capacitor
: Polypropylene capacitor
: Metalized polypropylene capacitor
: Metalized film capacitor
: Thin film capacitor
: Bipolar electrolytic capacitor
: Tantalum capacitor
: [µH]
: As specified
: B1
: 9V
: Only test point display
: Connector
: Receptacle
: Wrapping or soldering
: B2 (12V
: 5V
)
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value
No unit :[
K
M
Rated allowable 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 than 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]
(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 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.
)
No.52166
2-1
CONTENTS
SEMICONDUCTOR SHAPES ......................................................................2-2
BLOCK DIAGRAM........................................................................................2-3
CIRCUIT DIAGRAMS....................................................................................2-5
MAIN PWB CIRCUIT DIAGRAM ................................................................................................................ 2-5
CRT SOCKET PWB CIRCUIT DIAGRAM................................................................................................... 2-9
PATTERN DIAGRAMS ...............................................................................2-11
MAIN PWB PATTERN...............................................................................................................................2-11
CRT SOCKET PWB P ATTERN................................................................................................................. 2-13
CHANNEL CHART(US).............................................................................. 2-15
CHANNEL CHART(CA).............................................................................. 2-16
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.52166
BLOCK DIAGRAM
AUDIO
OUT
Y/C
INPUT 1
VIDEO
AUDIO
COMPONENT
VIDEO
INPUT 2
AUDIO
VIDEO
INPUT 3
AUDIO
L
R
V1
L1
R1
Y
Pb
Pr
L2
R2
V3
L3
R3
Y1/C1
TU001
TUNER
Y/Pb/Pr
IF
IC101
IF
AMP
LIMIT
AMP
IF & DET
FM
DET
VIDEO
DET
AF
AMP
EQ
AMP
VTV
IC651
STEREO
MPX
AUDIO L/R OUT
DEMODULAT
MATRIX
AUDIO L/R
L3/R3
MTS DECODE & AUDIO CONTROL
SURROUND
TONE/VOL
CONTROL
L/R
IC641
A.H.S
L/R
IC601
BBE
L/R
IC602
AUDIO OUT
L/R
L
R
SPEAKER
SPEAKER
HEADPHONE
L
R
MAIN PWB
Y
Y
KEY
IC251
Y/C SEP
Y
C
CHROMA
DEMOD
CPU
C
Y
PROCESS
IC201
OSD
GENERAT.
MICRO COMPUTER
/CLOSED CAPTION DECODER
/VIDEO.SYNC.DEF. PROCESS
RGB
CHROMA
CONTROL
/ MATRIX
SYNC
SEP.
PROCESS
V.
OSC.
H.
OSC.
H
R/G/B
V
Q301
Q321
RGB OUT
CRT SOCKET
PWB
(Within MAIN PWB)
CRT
V1
V3
Y/C
Y1/C1
L1/R1
L2/R2
IC851
V
Y/C
AUDIO L/R
AV SW
Pb/Pr
AC IN
RM SW
T921
D901
SW.
TRANSF.
IC901
POWER REG.
No.52166 No.521662-42-3
IC702
MEMORY
B1
Q501
H.DRIVE
IC421
VERT OUT
Q521
H.OUT
T521
HVT
(V)
(H)
DEF. YOKE
(ITC)
FOCUS
SCREEN
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