JVC AV-2537V1/E, AV-25VX71/G, AV-25VX71/S Schematics
SCHEMATIC DIAGRAMS
FLAT COLOUR TELEVISION
AV-25VX71
AV-25VX71
AV-2537V1
CD-ROM No. SML200312
/G
/S
/E
BASIC CHASSIS
CH3
RM-C1302
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.52202
2003/11
AV-25VX71/G, AV-25VX71/S, AV-2537V1/E
STANDARD CIRCUIT DIAGRAM
! !
!
! !
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.
!!
! symbol and shading are
!!
2. SPECIFIED VOLTAGE AND WAVEFORM 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
: Original setting position when
shipped
:V ⇒ 5ms/div
: Others ⇒ Sweeping time is
specified
∗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
•
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
∗Respective 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 : [Ω]
k:[kΩ]
M:[MΩ]
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 : Uninflammable 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]
(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
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 indicated in
the part list.
When ordering parts, please use the numbers that appear in
the Parts List.
(No. 52202) 2-1
CONTENTS
SEMICONDUCTOR SHAPES................................................................................................................................. 2-2
BLOCK DIAGRAM ......................................................................................................................................................... 2-3
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM (1/3) ............................................................................................................................. 2-5
MAIN PWB CIRCUIT DIAGRAM (2/3) ............................................................................................................................. 2-7
MAIN PWB (CRT SOCKET) CIRCUIT DIAGRAM (3/3) ............................................................................................... 2-8
PATTERN DIAGRAMS
MAIN PWB PATTERN ........................................................................................................................................................ 2-9
VOLTAGE CHART ........................................................................................................................................................ 2-11
WAVEFORMS .................................................................................................................................................................. 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. 52202)
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