Page 1
SCHEMATIC DIAGRAMS
COLOUR TELEVISION
AV-20N8(VT)
AV-20N8
AV-20N8
++−
−
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
No. 56031 2-1
No. 56031
Jul. 2000
Page 2
AV-20N8
2-2 No. 56031
Page 3
STANDARD CIRCUIT DIAGRAM
AV-20N8
■ 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 V ALUES
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. 56031 2-3
Page 4
AV-20N8
CONTENTS
SEMICONDUCTOR SHAPES ........................................................... 2-4
BLOCK DIAGRAM ............................................................................ 2-5
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM............................................................................................... 2-7
CRT SOCKET PWB CIRCUIT DIAGRAM .............................................................................. 2-13
PATTERN DIAGRAMS
MAIN PWB PATTERN............................................................................................................. 2-15
CRT SOCKET PWB PATTERN............................................................................................... 2-17
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. 56031
1
N
Page 5
BLOCK DIAGRAM
AV-20N8 AV-20N8
REAR IN
VIDEO
AUDIO
REAR OUT
VIDEO
AUDIO
MAIN PWB
L
R
L
R
TUNER
IF IF
Q101
AMP
Q102
SW
3.58/OTH
12V
IC703
5V REG & RESET
IC702
MEMORY
ENABLE, DATA, CLOCK, LOCK
RF IN
12
RF IN
5
L IN
10
R IN
7
SAW FILTER
SF101
SAW FILTER (PAL)
SF102
TV. M
RESET
SCL
SDA
IC202
AUDIO SW
LOUT
ROUT
4
V-1N
5
V-1N
7
S-1N
IC101
PIF/SIF
DETECTOR
FM OUT
10 11
13
30
IC701
MICRO
COMPUTER
VIDEO OUT
VIDEO IN
1
19
11
8
F901
18
V-OUT
16
VCO
15
VCO
13
SIF OUT
SIF IN
IC601
SURROUND
LIN
LOUT
RIN
ROUT
D901
RECT
OSD
SCL,SDA
3
5
CF106
6.0 TRAP
T101
VCO
(CW)
CF604
5.5MHz FILTER
VOL & TONE
11
LIN
6
SCL
SDA
RIN
T921
SW
TRANSF.
IC921
POWER
REG
IC602
LOUT
ROUT
Q971
LOW-B SW
ERROR AMP
PC921
VOLT AGE
FEEDBACK
CF103
4.5MHz
CF104, 105
5.5/6.5 TRAP
CF608
6.5MHz FILTER
Q604
SIF AMP
47
TV IN
V-OUT V-1N
56
1 4 53 14 13 12
17
16
IC941
CF601
4.5TRAP
Q103
BUFFER
Q107
BUFFER
IC201
V/C DEF.
PROCESSOR
H.
OUTV.OUT
IC971
12V REG.
IC972
9V REG.
IC973
5V REG.
TV. V
RGB
12V
9V
5V
H.OUT
Q522
H.OUT
TP-91(B1)
V.OUT
4
H.OUT
LIN
1
13
RIN
VIDEO IN
AUDIO IN
VERT.OUT
T522
HVT
(FBT)
IC651
AUDIO AMP
IC421
V.OUT
2
ANODE
FOCUS
SCREEN
LOUT
ROUT
6
8
ECO
SENSOR
REMOCON
RECEIVER
KEY
LED
POWER SW
B
G
Q351~Q353
R
R.G.B. OUT
CRT SOCKET
PWB
V. DY
H. DY
SP02
L
SP01
R
FRONT IN
VIDEO
L
AUDIO
R
AC IN
V01
CRT
No. 56031 No. 560312-62-5
Page 6
AV-20N8 AV-20N8
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM (1/3)
SCL-1285A-CK (AV-20N8-VT)
No. 56031 2-7 No. 560312-8
Page 7
MAIN PWB CIRCUIT DIAGRAM (2/3)
SCL-1285A-CK (AV-20N8-VT)
CRT SOCKET PWB
CRT SOCKET PWB
AV-20N8 AV-20N8
No. 56031 No. 560312-62-5
2-102-9
Page 8
MAIN PWB CIRCUIT DIAGRAM (3/3)
AV-20N8 AV-20N8
SCL-1285A-CK (AV-20N8-VT)
No. 56031 2-7 No. 560312-8
2-122-11
AV20N8-VT
Page 9
CRT SOCKET PWB CIRCUIT DIAGRAM
MAIN PWB
AV-20N8 AV-20N8
A48JLL91X01
SCL-3012A-CK (AV-20N8-VT)
No. 56031 No. 560312-62-5
2-142-13
Page 10
AV-20N8 AV-20N8
PATTERN DIAGRAMS
MAIN PWB PATTERN
TP-E
( )
TP-91
(B1)
( )
FRONT
No. 56031 2-7 No. 560312-8
2-162-15
Page 11
CRT SOCKET PWB PATTERN
AV-20N8
TOP
( )
No. 56031 2-17
Page 12
AV-21FT
VICTOR COMPANY OF JAPAN, LIMITED
TELEVISION RECEIVER DIVISION 1106 Heta, Iwai-city, Ibaraki-prefecture, 306-0698, Japan
No. 560312-18
Printed in Japan
CTH 0007
CRT
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