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AV-25PX
CONTENTS
SEMICONDUCTOR SHAPES
BLOCK DIAGRAM
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM
POWER & DEF PWB CIRCUIT DIAGRAM
CRT SOCKET PWB CIRCUIT DIAGRAM
FRONT CONTROL PWB CIRCUIT DIAGRAM
AV SEL. PWB CIRCUIT DIAGRAM
PATTERN DIAGRAMS
MAIN PWB PATTERN
[SJK-1006A-H2]
POWER & DEF PWB PATTERN
[SJK-2004A-H2]
CRT SOCKET PWB PATTERN
[SJK-3002A-H2]
FRONT CONTROL PWB PATTERN
[SJK-8003A-H2]
[SJK0S006A-H2]
AV SEL. PWB PATTERN
SEMICONDUCTOR SHAPES
TRANSISTOR
BOTTOM VIEW
FRONT VIEW
-
+
*
* + -
- + *
/ , 5
IC
BOTTOM VIEW
FRONT VIEW
OUT
E
IN
IN
E
OUT
CHIP IC
TOP VIEW
N
N
N
1
N
2-2
2-2
2-3
2-5
2-9
2-11
2-13
2-15
2-17
2-19
2-21
2-23
2-25
TOP VIEW
CHIP TR
C
- + *
- + *
B
TOP VIEW
1
N
1
N
1
N
1
N
No.51752
AV-25PX STANDARD CIRCUIT DIAGRAM
n 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
each knob/button and
variable resistor
(3)Internal resistance of tester
(4)Oscilloscope sweeping time
(5)Voltage values
– S ince 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
œ
4.INDICATIONS ON THE CIRCUIT DIAGRAM
E
(1)Resistors
œResistance value
No unit
K
M
œRated allowable power
No indication
Others
œType
No indication
OMR
MFR
MPR
UNFR
FR
*Composition resistor 1/2 [W] is specified as 1/2S or Comp.
(2)Capacitors
œCapacitance value
1 or higher
less than 1
œWithstand voltage
No indication
AC indicated
Others
*Electrolytic Capacitors
47/50[Example]:Capacitance value [µF]/withstand voltage[V]
œType
No indication
MY
MM
PP
MPP
MF
TF
BP
TAN
: Colour bar signal
(3)Coils
No unit
positions
of
Others
(4)Power Supply
:Original setting position
when shipped
:DC 20k¶/V
:H
Ë 20µS/div
:V
Ë 5mS/div
*Respective voltage values are indicated
:Others Ë Sweeping time is
(5)Test point
specified
:All DC voltage values
(6)Connecting method
:R1209¨R209
(7)Ground symbol
:[¶]
:[K¶]
:[M¶]
:1/10[W]
:As specified
5.NOTE FOR REPAIRING SERVICE
This model’s power circuit is partly different in the GND. The
:Carbon resistor
difference of the GND is shown by the LIVE : () side GND and the
:Oxide metal film resistor
ISOLATED(NEUTRAL) : () side GND. Therefore, care must be
:Metal film resistor
taken for the following points.
:Metal plate resistor
(1)Do not touch the LIVE side GND or the LIVE side GND and the
:Uninflammable resistor
ISOLATED(NEUTRAL) side GND simultaneously. If the above
:Fusible resistor
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
:[pF]
ISOLATED(NEUTRAL) side GND or never measure with a
:[µF]
measuring apparatus ( oscilloscope, etc.) the LIVE side GND and
ISOLATED(NEUTRAL) side GND at the same time. If the above
:DC50[V]
precaution is not respected , a fuse or any parts will be broken.
:AC withstand voltage [V]
:DC withstand voltage [V]
ž Since the circuit diagram is a standard one, the circuit and
circuit constants may be subject to change for improvement
without any notice.
AV-25PX
: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
:12V
:9V
:5V
:Test point
:Only test point display
:Connector
:Wrapping or soldering
:Receptacle
:LIVE side ground
:ISOLATED(NEUTRAL) side ground
:EARTH ground
:DIGITAL ground
not
short
between
the
LIVE
side
GND
and
Aug. 2000 No.51752
Jun. 1998
1
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