JVC RM-C1305-1H Service Manual page 82

AV-21V311
/B
STANDARD CIRCUIT DIAGRAM
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
(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-21V511
/B
: Colour bar signal
: Original setting position when
shipped
⇒ 20µs/div
⇒ 5ms/div
: V
: Others ⇒ Sweeping time is
specified
: All DC voltage values
, AV-21V531
/B
•
Type
No indication
MY
MM
PP
MPP
MF
TF
BP
TAN
(3) Coils
No unit
Others
(4) Power Supply
∗
Respective voltage values are indicated
(5) Test point
(6) Connecting method
(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
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) D o n o t s h o r t b e t w e e n t h e L I V E s i d e G N D a n d
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.
: Ceramic capacitor
: Mylar capacitor
: Metalized mylar capacitor
: Polypropylene capacitor
: Metalized polypropylene capacitor
: Metalized film capacitor
: Thin film capacitor
: Bipolar electrolytic capacitor
: Tantalum capacitor
: [µH]
: As specified
: B1
: B2(12V)
: 9V
: 5V
: Test point
: Only test point display
: Connector
: Wrapping or soldering
: Receptacle
) side GND and the
) side GND. Therefore, care must be taken
(No. 52176) 2-1