Standard Circuit Diagram - JVC AV-29WX14/G Service Manual

AV-29WX14
/G

STANDARD CIRCUIT DIAGRAM

NOTE ON USING CIRCUIT DIAGRAMS
1. SAFETY
The components identified by the
are critical for safety. For continued safety replace safety
c r i t i c a l c o m p o n e n t s o n l y w i t h t h e m a n u f a c t u r e r ' s
recommended parts.
2. SPECIFIED VOLTAGE AND WAVEFORM VALUES
The voltage and waveform values have been measured under the
following conditions.
(1) Input signal
(2) Setting positions of each knob/button and
variable resistor
(3) Internal resistance of tester : DC 20kΩ/V
(4) Oscilloscope sweeping time : H
(5) 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]
•
: R1209 → R209
In the PW board
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]
, AV-29WX14
symbol and shading
: Colour bar signal
: Original setting position when
shipped
⇒ 20µs/div
⇒ 5ms/div
: V
: Others ⇒ S w e e p i n g t i m e i s
specified
: All DC voltage values
, AV-29WX14
/S
•
Type
No indication : Ceramic capacitor
MY : Mylar capacitor
MM : Metalized mylar capacitor
P P : 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)
: 3.3V
: 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 : (
ISOLATED(NEUTRAL) : (
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 cau-
tion is not observed, an electric shock may be caused. Therefore,
make sure that the power cord is surely removed from the recepta-
cle when, for example, the chassis is pulled out.
(2) Do not short between the LIVE side GND and ISOLATED(NEUTRAL)
s i d e G N D o r n e v e r m e a s u r e t h e L I V E s i d e G N D a n d
ISOLATED(NEUTRAL) side GND at the same time with a measuring
apparatus ( oscilloscope, etc.). If the above precaution is not
observed, 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
♦
As a result of later perfermance improvement some part
numbers shown 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.
, AV-2954W
/L
) side GND and the
) side GND. Therefore, care must be taken
(No. YA104) 2-1
/E