JVC AV-21L31ME, AV-25L31ME Diagram
AV-21L31/ME
AV-21L31
AV-25L31
AV-25L31/ME
q
NOTE ON USING CIRCUIT DIAGRAMS
STANDARD CIRCUIT DIAGRAM
1. SAFETY
The components identified by the symbol and shading are
critical for safety. For continued safety replace safety critical
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 : Color bar signal
(2)
Setting positions of each knob/button and variable resistor
: Original setting position when
shipped
(3) Internal resistance of tester : DC 20kØ/V
(4) Oscilloscope sweeping time : H ⇒ 20µS/div
:V ⇒ 5mS/div
: Others ⇒ Sweeping time is
specified.
(5) Voltage values : All DC voltage values
9Since the voltage values of signal circuit vary to some extent ac-
cording to adjustments, use them as reference values.
3. INDICATION OF PARTS SYMBOL [EXAMPLE]
• In the PW board : R1209
→
R209
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
: B2(12V)
:9V
:5V
9Respective voltage values are indicated
(5) Test point
: Test point
: Only test point display
4. INDICATIONS ON THE CIRCUIT DIAGRAM
(1) Resistors
Resistance value
•
No unit : [Ø]
k:[kØ]
M:[MØ]
Rated allowable power
•
No indication : 1/16 [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
9Composition 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]
9 Electrolytic Capacitors
47/50[Example] : Capacitance value [µF]/withstand voltage[V]
(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 ISOLATED(NEUTRAL)
side GND or never measure the LIVE side GND and
ISOLATED(NEUTRAL) side GND at the same time with a measuring apparatus ( oscilloscope, etc.). 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 cir-
•
cuit constants may be subject to change for improvement without any notice.
Mar. 2002 No. 51908
AV-21L31
AV-25L31
CONTENTS
SEMICONDUCTOR SHAPES ................................................................................................................................. 2-2
BLOCK DIAGRAM.......................................................................................................................................................... 2-3
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM (1/3) ............................................................................................................................. 2-5
MAIN PWB CIRCUIT DIAGRAMS (2/3, 3/3) ................................................................................................................... 2-7
PATTERN DIAGRAMS
MAIN PWB PATTERN......................................................................................................................................................... 2-9
MAIN PWB (CRT SOCKET) PATTERN ......................................................................................................................... 2-11
CHANNEL CHART ....................................................................................................................................................... 2-12
SEMICONDUCTOR SHAPES
TRANSISTOR
TOP VIEWBOTTOM VIEW FRONT VIEW
CHIP TR
E
C
B
ECB
EC
B
(G)(D)(S)
ECB
ECB
C
B
E
IC
CHIP IC
TOP VIEWBOTTOM VIEW FRONT VIEW
OUT
E
IN
IN E OUT
N
N
N
1
N
1N
TOP VIEW
1
N
1N
1N
2-2 No.51908
BLOCK DIAGRAM
AV-21L31 AV-21L31
AV-25L31 AV-25L31
J801
VIDEO-1
INPUT
J802,J803
COMPONENT
(VIDEO-2)
INPUT
J804
OUTPUT
J771-J773
FRONT IN
(VIDEO-3)
TU001
TUNER
VIDEO
AUDIO L/MONO
AUDIO R
V/Y
B
C
C
R
AUDIO L/MONO
AUDIO R
VIDEO OUT
AUDIO L
AUDIO R
VIDEO
AUDIO L/MONO
AUDIO R
SCL
SDA
IF
43
44
42
19
MAIN PWB
28
SF101
FILTER
SF102
FILTER
29,30
SCL
SDA
7
V1-V
8
V1-L
10
V1-R
3
V2-Y
1
Y2-V
2
V2-L
4
V2-R
37
Vout2
36
Lout2
35
Rout2
V3-V
V3-L
V3-R
Yin1
Cout1
Yout1
IC801
VIDEO SW
MTV-V
MTV-R
MTV-L
Rout1
Vout1
Lout1
25
27
C
C
13
15
14
26
24
23
Q111 Q109
BUF
IC702
EEPROM
B
R
5,6
CF106
29
23
24
2,3
62,63
43
42
47
48
46
TRAP
SIF IN1
SIF IN2
IF IN1
IF IN2
IC701
V/C DEF.
PROCESSOR
SCL,SDA
SCL1
SDA1
CIN
CVBS/YIN
Y
U
V
7
ROUT
GOUT
BOUT
QSS OUT
VDRB(-)
VDRA(+)
HOUT
IF VOUT
10, 54
BUF
51
52
53
35
21,22
33
38
R
G
B
SCL
BUF
Q150
SDA
2
IC601
MULTI SOUND
PROCESSOR
40 41
26,27
30,31
L, R
L_VOL, R_VOL
IC665
FILTER
5
2
IC650
AUDIO AMP
7
12
MAIN (CRT SOCKET)
IC351
VIDEO AMP
J770
HEADPHONE
JACK
SP
SP
R
V01
L
AC IN
VOL+
VOL- CH+ CH- MENU
REMOCON
RECEIVER
S901
POWER SW
POWER
LED
F901
No.51908 2-3 2-4 No.51908
KEY_IN
REMOTE, LED
D901
RECT
IC901
POWER
REG
T901
SW
TRANSF.
PC901
VOLTAGE
FEEDBACK
IC951
ERROR
AMP
IC972
3.3V REG
IC974
REG
L951
IC401
VERT OUT
Q522
H. OUT
3.3V_STB
5V
8V
9V
32V
B1
T551
FBT
FOCUS1
SCREEN
EHV
V
DY01
DEF YOKE
H
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