JVC DT-V2000SU Service Manual page 79

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DT-V2000SU
DT-V2000SU,A STANDARD CIRCUIT DIAGRAMS
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NOTE ON USING CIRCUIT DIAGRAMS
1. SAFETY
The components identified by the.1. 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
:Original setting position
when shipped
(3)Internal resistance of tester :DC 20k
Q
N
(4)Oscilloscope sweeping time :H
=> 20µS/div
(5)Voltage values
:V => 5mS/div
:Others => Sweeping time is
specified
:All DC 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]
eln the PW board :R12Q9-.R209
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1 )Resistors
eResistance value
No unit
K
M
:[Q]
:[KQ]
:[MQ]
eRated allowable power
No indication :1/4[W]
Others :As specified
eType
No indication
OMR
MFR
MPR
:Carbon resistor
:Oxide metal film resistor
:Metal film resistor
:Metal plate resistor
UNFR :Uninflammable resistor
FR :Fusible resistor
*Composition resistor 1/2 [W] is specified as 1/2S or Comp.
(2)Capacitors
ecapacitance value
1 or higher :[pF]
less than 1 :[µF]
eWithstand voltage
No indication :DC50[V]
AC indicated
Others
:AC withstand voltage [V]
:DC withstand voltage [V]
*Electrolytic Capacitors
47/50[Example]:Capacitance value [µF]/withstand voltage[V]
eType
No indication
MY
MM
pp
MPP
MF
TF
BP
TAN
(3)Coils
No unit
Others
(4)Power Supply
----
-□-□
: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
:81
:B2(12V)
:9V
DODD
:5V
*Respective voltage values are indicated
(5)Test point
@
I
:Test point
¥
:Only test point display
(6)Connecting method
D
:Connector
Q
:Wrapping or soldering
->-- -}- :Receptacle
(7)Ground symbol
..L
:LIVE side ground
,.I,
: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: (J_) side GND and the
ISOLATED(NEUTRAL) : ( ,J,) 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
circuit constants may be subject to change for improvement
without any notice.
Aug. 1999 No.515198