Page 1
STANDARD CIRCUIT DIAGRAM
AV-21AT
■ 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 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 : 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. 56013 2-3
Page 2
AV-21AT
CONTENTS
SEMICONDUCTOR SHAPES ........................................................... 2-4
BLOCK DIAGRAM ............................................................................ 2-5
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM (Including CRT SOCKET PWB) ......................................... 2-7
PATTERN DIAGRAMS
MAIN PWB PATTERN ............................................................................................................. 2-11
CRT SOCKET PWB PATTERN............................................................................................... 2-13
SEMICONDUCTOR SHAPES
TRANSISTOR
BOTTOM VIEW
IC
BOTTOM VIEW
CHIP IC
E
C
B
OUT
E
IN
N
N
FRONT VIEW
E
CB
IN E OUT
B
(G)C(D)E(S)
1N
TOP VIEW
1
E
CB
E
CB
1N
TOP VIEW
CHIP TR
C
BE
TOP VIEWFRONT VIEW
1N
N
1
N
2-4 No. 56013
N
Page 3
BLOCK DIAGRAM
MAIN PWB
AV-21AT AV-21AT
SP01
REAR
VIDEO
IN
AUDIO
IC703
5V REG/RESET
IC702
MEMORY
TU001
TUNER
SCL
SDA
IF
34
RST
IC701
MICRO COMPUTER
2,3
SCL
SDA
2537,38
3.58/
OTH
Q102
IF AMP
OSD
RGB
Q103
SW
SCL/SDA
30,31,32
SF102
SF122
6,7,8
21 18,19
SAWQSS IN
EXT
RGB
VIDEO
VIDEO
IN
OUT
24 36 29
IC301
1 CHIP DECODER
AUDIO
IN
H.OUT V.OUT
42 46
AUDIO AMP
IN
3
30
AUDIO OUT
RGB
IC651
10,11,12
OUT
9
SP01
HEADPHONE
ECO
VIDEO
FRONT IN
REMOCON
AUDIO
KEY
IND.
CRT SOCKET PWB
(WITHIN MAIN PWB)
R/G/B
Q351-Q353
RGB OUT
V01
CRT
OUT
VIDEO
AUDIO
AC IN
POWER SW
F901
D901
RECT
IC921
POWER
REG.
PC921
VOLTAGE
FEEDBACK
T921
SW
TRANSF.
5/9V REG.
IC941
ERROR
AMP
IC971
5V
9V
H.OUT
H.OUT
TP-B1
V.OUT
Q522
IC421
52
V.OUT
FOCUS
T522
HVT
SCREEN
EHV
DY(V)
DY(H)
DEF. Y OKE
No. 56013 No. 560132-62-5
Page 4
AV-21AT AV-21AT
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM (1/2)
No. 56013 2-7 No. 560132-8
SCG-1247A-H2 (AV-21AT)
Page 5
MAIN PWB CIRCUIT DIAGRAM (2/2)
AV-21AT AV-21AT
CRT SOCKET
(WITHIN MAIN PWB)
No. 56013 No. 560132-62-5
SCG-1247A-H2 (AV-21AT)
2-102-9
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