Standard Circuit Diagram - JVC AV-34LS Service Manual

AV-34LS
AV-34LS
(-AU)
AV-34LH

STANDARD CIRCUIT DIAGRAM

q 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 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 20kØ/V
(4) Oscilloscope sweeping time : H
(5) Voltage values
9
Since 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]
•
: R1209 → R209
In the PW board
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
9
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]
9
Electrolytic Capacitors
47/50[Example] : Capacitance value [µF]/withstand voltage[V]
AV-34LX
AV-34LX
(-A)
AV-3408TEE
symbol and shading are
: Colour bar signal
: Original setting position when
shipped
⇒ 20µS/div
⇒ 5mS/div
: V
: Others ⇒ Sweeping time is
specified.
: All DC voltage values
•
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
9
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) : ( ) 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 cau-
tion is not respected, 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)
side GND or never measure with a measuring apparatus ( oscillo-
scope, 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 with-
out any notice.
AV-34LS AV-34LX
AV-34LH AV-3408TEE
) side GND and the
Aug. 2001 No. 51854