JVC AV-20N3, AV-20N3/D, AV-20NMG3, AV-20NMG3/-A, AV-20NMG3B Schematics
SCHEMATIC DIAGRAMS
COLOUR TELEVISION
BASIC CHASSIS
AV-20N3
AV-20NMG3
AV-20NMG3B
AV-20N3 / AV-20N3/D
AV-20NMG3 / AV-20NMG3B
/ AV-20NMG3
CD-ROM No.SML200207
/-A
CG
[RM-C364GY]
[RM-C364]
CONTENTS
NOTE ON USING CIRCUIT DIAGRAMS
SEMICONDUCTOR SHAPES
BLOCK DIAGRAM
CIRCUIT DIAGRAMS
PATTERN DIAGRAMS
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
2-1
2-2
2-3
2-5
2-9
No.52025
Jun. 2002
AV-20N3
STANDARD CIRCUIT DIAGRAM
AV-20N3, AV-20N3/D,
AV-20NMG3, AV-20NMG3B, AV-20NMG3/-A
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 cond itions.
(1)Input signal : Colour bar signal
(2)Setting positions of
each knob/button and
variable resistor
(3)Internal resistance of tester
:DC 20k
/V
(4)Oscilloscope sweeping time
:H
20µS/div
:V
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.IND ICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value
No unit :[
]
K
:[K
]
M
Rated allowable power
No indication :1/ 16 [W]
Others :As specified
Type
No indica tion
:Carbon resistor
OMR
:Oxide metal film resistor
MFR
:Metal film resistor
MPR
:Metal plate resistor
UNFR
:Uninflammable resi stor
FR
:Fusible resistor
C omposition resistor 1/2 [W] is specified as 1/2 S or Comp.
(2)Capacitors
: Original setting position
when shipped
5.NOTE FOR REPAIRING SERV ICE
This mod el's power cir cuit is pa rtly diffe rent 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 f use or any parts will be broken.
Since the circuit diagram is a standard one, the ci rcuit 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 i ndicated in
the part list.
When ordering parts, plea se use the numbers t hat appear
in the Parts List.
Type
MM
:M etal ized mylar capa c i tor
PP
:Polypropylene capacitor
MPP
:Metalized polypropylene capacitor
MF
:Metaliz ed film capac itor
TF
:Thin film capacitor
BP
:Bipolar electrolytic capaci tor
TAN
:Tant alum capa citor
(3)Coils
No unit
:[
µ
H]
Others
:As specified
(4)Power Supply
:B1
:9V
:5V
Respective voltage values are indicated
(5)Test point
:T est po int
: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 :DC50[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-20NMG3
AV-20NMG3B
AV-20N3
AV-20NMG3
AV-20NMG3B
2-12
No.52025
VP0206
DP8080
Jun. 2002 No. 52025
AV-20N3
B
G1
RK
H
1
4
E
U
MARK
C
GK
G1
HE
H
BK
G2 GK
RK
HE
BK
G1
G2
E1
SCREEN
Q351
Q352
Q353
R364
R369
R360
R361
R362
C357
L351
L354
R3
55
R356
R359
R366
C354
TP-E
R351
Y303
W611
SK351
Y304
R346
W338
R349
TP-47B
D352
D351
D356
UL MARK
5
1
MARK
T
C
B
C
B
E
/2!
E
CKF1674-BH1-1
W337
R363
R365
C352
C351
52
L3
L353
K351
W336
353
R
R354
R357
R358
R367
R368
C355
C356
R352
R345
R347
R348
W576
D353
D354
D355
TP-47G/R
TP-47R/G
AV-20NMG3
AV-20NMG3B
CONTENTS
AV-20N3
A V-20NMG3
AV-20NMG3B
CRT SOCKET PWB PATTERN
SEMICONDUCTOR SHAPES
BLOCK DIA GRAM
CIRCUIT DIAGRAMS
MAI N PWB CIRCUI T DIAGRAM
P ATTERN DIAGRAMS
MAIN PW B PATTERN
CRT SOCKET PWB PATTERN
SEMICONDUCTOR SHAPES
TRANSISTOR
BOTTOM VIEW
E
C
B
ECB
BCE
(G)(D)(S )
FRONT VIEW
ECB
ECB
2-2
2-3
2-5
TOP
2-9
2-11
TO P VI EW
CHIP TR
C
BE
IN OUTE
1 N
TO P VI EW
1
N
1 N
1
N
IC
N
N
OUT
E
IN
N
1
N
B O TT OM VI EW F R O NT V IEW TO P VI EW
CHIP IC
2-2 2-11
No.52025No.52025
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