Standard Circuit Diagram - JVC AV-27320 Service Manual

AV-27320
AV-27330
AV-27S33
CONTENTS
SEMICONDUCTOR SHAPES
BLOCK DIAGRAM
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM
MAIN & CRT SOCKET PWB CIRCUIT DIAGRAM
PATTERN DIAGRAMS
MAIN & CRT SOCKET PWB PATTERN
CHANNEL CHART
(US)
CHANNEL CHART
(CA)
SEMICONDUCTOR SHAPES
TRANSISTOR
BOTTOM VIEW FRONT VIEW
E
C
B
B C E
E C B
(G)(D)(S)
IC
BOTTOM VIEW FRONT VIEW
OUT
E
IN
1
IN E OUT
CHIP IC
TOP VIEW
N
N
N
1
N
2-2
2-2
2-3
2-7
2-9
2-11
2-13
2-14
TOP VIEW
CHIP TR
C
E C B
E C B B E
TOP VIEW
1 N
1 N
N
1
N
No.51937
AV-27320 ,AV-27330
/S/R

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 : Colour bar signal
(2)Setting positions of
each knob/button and
: Original setting position
variable resistor
when shipped
(3)Internal resistance of tester
:DC 20k /V
(4)Oscilloscope sweeping time
:H 20µS/div
:V 5mS/div
:Others
Sweeping time is
specified
(5)Voltage values :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]
In the PW board :R1209
R209
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value
No unit :[ ]
K :[K ]
M
:[M ]
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]
Others :DC withstand voltage [V]
AC indicated :AC withstand voltage [V]
Electrolytic Capacitors
47/50[Example]:Capacitance value [µF]/withstand voltage[V]
,AV-27S33
/S/R /S/R
Type
No indication :Ceramic 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
:[ µ H]
No unit
Others :As specified
(4)Power Supply
:B1
:9V
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 : ( ) side GND and the
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
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 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.
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.
May 2002 No. 51937
AV-27320
AV-27330
AV-27S33
:B2 (12V)
:5V