JVC AV-27BM3

AV-27BM3
AV-27CM3
AV-27BM3us)/ AV-27CM3.usaca)
STANDARD CIRCUIT DIAGRAM
aNOTE ON USING CIRCUIT DIAGRAMS
1.SAFETY
The components identified by the A\symbol and shading
are critical for safety. For continued satety 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.
{)Input signal :Color bar signal
(2)Setting positions
‘of each knob/button
and variable resistor :Original setting position
when shipped
{3)internai resistance of tester :DC 20kQ/v
(4)Oscilloscope sweeping time cH =20pSidiv
wv =5mS/div
Others => Sweeping time is
specified
(5)Voltage values :All DC voltage values
* Since the voltage values of signal circuil vary to some oxtent
according to adjustments, use them as reference values.
3.INDICATION OF PARTS SYMBOL[EXAMPLE]
‘ein the P.C. board :R1209-R203
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value
No unit {]
K KO)
M [MQ]
Rated allowable power
No indication :1/6[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 12S or Comp.
(2)Capacitors
Capacitance value
tor higher [pF]
less than 1 {uF]
‘Withstand voltage
No indication :DC50[V}
Others :DC withstand voltage[V}
AC indicated :AC withstand voltage[V]
* Electrolytic Capacitors
47/50[Exampie|:Capacitance value{yiF withstand voltage{V]
©Since the circuit
eramic capacitor
MY :Mylar capacitor
MM jotalized mylar capacitor
PP Polypropylene capacitor
MPP :Metalized polypropylene capacitor
MF :Metalized {ilm capacitor
TF :Thin filam capacitor
BP :Bipolar electrolytic capacitor
TAN ‘Tantalum capacitor
(3)Coils
No unit [aH]
Others “As specified
(4)Power Supply
:B1(129.3V)
i . :B2(12V)
eimai. 3V
JAC sv
* Respective voltage values are indicated.
(5)Test Point
: Test point
: Only test point display
(6)Connecting method
Oo : Connector
oO : Board in connector
Oo oO : Wrapping or soldering
> oo
(7)Ground symbol
-L : UVE side ground
wp: NEUTRAL side ground
a: EARTH ground
: Receptacle
5.NOTE FOR REPAIRING SERVICE
This modet’s power circuit is partly difforent in the GND. The
difference of the GND is shown by the LIVE (primary: _L.) side
GND and the NEUTRAL (secondary : --) side GND. Therelore,
care must be taken for the following points.
(1),Do not touch lhe LIVE side GND or the LIVE side GND and
the 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 NEUTRAL
side GND or never measure with a measuring apparatus
(oscilloscope, etc.) the LIVE side GND and NEUTRAL side
GND al the same time. If the above precaution is not
respected, a fuse or any paris will bo broken.
iagram is a standard one, the
circuit and circuit constants may be subject to
change for improvement without any notice.
May. 1992 No.50718