JVC AV-27F702/S Schematics
AV-27F702
AV-27F702/s STANDARD CIRCUIT DIAGRAM
q
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 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
(3) Internal resistance of tester : DC 20kØ/V
(4) Oscilloscope sweeping time : H ⇒ 20µS/div
(5) Voltage values : All DC voltage values
: Original setting position when
shipped
:V ⇒ 5mS/div
: Others ⇒ Sweeping time is
specified
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 : 1/10 [W]
Others : As specified
Type
•
No indication : Carbon resistor
OMR : Oxide metal film resistor
MFR : Metal film resistor
MPR : Metal plate resistor
UNFR : Uninflammable 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 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 cir-
•
cuit constants may be subject to change for improvement without any notice.
Jan. 2001 No. 51786
AV-27F702
CONTENTS
SEMICONDUCTOR SHAPES............................................................................................................................ 2-2
BLOCK DIAGRAM ...................................................................................................................................................... 2-3
CIRCUIT DIAGRAMS................................................................................................................................................2-5
MAIN PWB CIRCUIT DIAGRAM
MAIN, FRONT, POWER SW PWB CIRCUIT DIAGRAMS
AV SW PWB CIRCUIT DIAGRAM
CRT SOCKET PWB CIRCUIT DIAGRAM
DAF PWB CIRCUIT DIAGRAM
LF PWB CIRCUIT DIAGRAM
PATTERN DIAGRAMS ........................................................................................................................................... 2-19
MAIN PWB PATTERN.........................................................................................................................
AV SW, CRT SOCKET, DAF, FRONT, POWER SW, LF PWB PATTERN
.................................................................................................................................. 2-5
................................................................................... 2-9
............................................................................................................................. 2-11
.............................................................................................................. 2-13
.................................................................................................................................. 2-15
...................................................................................................................................... 2-17
2-19
..................................................... 2-21
SEMICONDUCTOR SHAPES
TRANSISTOR
E
C
B
ECB
IC
OUT
E
IN
IN E OUT
CHIP IC
N
N
EC
B
(G)(D)(S)
ECB
1N
TOP VIEW
1
ECB
1N
TOP VIEWBOTTOM VIEW FRONT VIEW
CHIP TR
C
B
E
TOP VIEWBOTTOM VIEW FRONT VIEW
1N
N
1
N
2-2 No.51786
N
BLOCK DIAGRAM
AV-27F702/S BLOCK DIAGRAM
AV-27F702 AV-27F702
J601
COMPONENT
VIDEO-IN
AV SW PWB (1/2)
J501
INPUT1
J502
INPUT2
TU001
TUNER
Y
B
P
P
R
S-VIDEO
VIDEO
AUDIO L/MONO
AUDIO R
VIDEO
AUDIO L/MONO
AUDIO R
IF R, G, B
SCL0
SDA0
IC501
SCL0
SDA0
SCL0
SDA0
COM_Y
COM_CB
COM_CR
C
Y
EEPROM
IC101
1 CHIP DECODER
AMP
BUF
SCL0
SDA0
SCL1
IC702
SDA1
IF
SIF
MPX
V. OUT
H. OUT
Y
C
IC701
MICRO
COMPUTER
CF021
4.5MHz
TRAP
CF041
4.5MHz BPF
VTV
SCL0
SDA0
MTS&TONE/VOL
L/R
L/R
IC001
CONTROL
L/R
CRT SOCKET PWB
IC151
SOUND
ENHANCEMENT
AUDIO PROCESSOR
R, G, B
RGB DRIVE
AV SW PWB (2/2)
IC401
AUDIO OUT
L/R
V01
SP
L
SP
R
J503
AUDIO OUT
J401
INPUT3
(FRONT)
VOL+
VOL- CH+ CH- MENU
FRONT PWB
POWER REMOCON
RECEIVER
POWER SW PWB
AUDIO L
AUDIO R
S-VIDEO
VIDEO
AUDIO L/MONO
AUDIO R
ON TIMER
LED
AV SW
C
Y
TV
L/R TV
L/R
VIDEO
C
Y
IC201
3L DIGITAL
COMB FILTER
IC381
AUDIO SW
AC IN
DAF PWB
Y
LPF
C
BPF
IC371
AMP
REG.
POWER SUPPLY
LF PWB
CIRCUIT
IC401
VERT OUT
Q511
H. OUT
T502
FBT
B1
V
H
DY01
DEF YOKE
FOCUS
SCREEN
HV
MAIN PWB
No.51786 No.517862-3 2-4
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM
INPUT2
AV-27F702 AV-27F702
CNMD1
X
(
NOT USED
8.8V
4V
)
4.9V
2.4
2.1V
V
IC101
8.8V
4.5V
47
1.0Vp-p(H
5.1
V
42
)
0.68Vp-p(H
)
10/50
4.9V
2.5V
0.47/50
8.8
V
4V
3.1V
3.3
2.4
3.8
V
V
4V
V
0.6V
1.7V
1.7V
7.3
V
8.8V
4.1V
4.8V
3.7V
3.1V
0V
4.8V
3V
8.8V
4.4
V
2.1V
2.3V
4.6
V
5.7V
3.8
V
1.6V
2.8V
2.1V
1.5V
3.1
V
2.3V
4.8V
2.2V
2.4V
2.3V
2.4V
3.1V
8.8V
2.5V
2.4V
2.5V
0V3V0V
0V 4.8V
2.2V
3.9V
8.9V
2.2V
6.8V
2.2V
1.9V
8.9V
3.1V
2.4V
0V
2.7V
0.6V
0V
0V
3.1V 0V
3.4V
0.9
3.2
3.3V
V
V
38
IC101
)
1.9Vp-p(V
34
IC101
)
4.6Vp-p(H
5.9V
11.8V
4.9V
15.7
V
8.8
V
12.7V
4.9
V
LF PWB
4.7V4.6V
2.4V
2.7V
4.7V
31.6V
0V
1.8V
8.8V
1.1V
8.8
V
9V
8.4
V
MAIN PWB ASS'Y
SAC-1502A-M2
CRT SOCKET
PWB
No.51786 No.51786
2-5 2-6
IC101
14
4.0Vp-p(H
15
)
3.5Vp-p(H
NOTE
:
BW
BUS WIRE (0
:
X NON MOUNT
:
2SC2412K/QR/-X
1
:
2SA1037AK/QR/-X
2
:
MA153A-X
3
:
UDZS9.1B-X
4
:
5
DTC124EKA-X
16
3.5Vp-p(H
)
)
)
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