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AV-27GFH
CONTENTS
¡ ¡ ¡ ¡ SEMICONDUCTOR SHAPES
2-2
¡ ¡ ¡ ¡ BLOCK DIAGRAM
2-3
¡CIRCUIT DIAGRAMS
MAIN PWB & FRONT CONTROL PWB CIRCUIT DIAGRAM
MAIN PWB & CRT SOCKET PWB CIRCUIT DIAGRAM
AV SELECTOR PWB & FRONT AV IN PWB CIRCUIT DIAGRAM
¡PATTERN DIAGRAMS
MAIN PWB PATTERN
[ SGF-1020A-M2 ]
AV SELECTOR PWB PATTERN
[ SGF-8008A-M2 ]
CRT SOCKET PWB PATTERN
[ SGF-3001A-M2 ]
FRONT CONTROL PWB PATTERN [ SGF-4001A-M2 ]
FRONT AV IN PWB PATTERN
[ SGF-8304A-M2 ]
SEMICONDUCTOR SHAPES
TRANSISTOR
BOTTOM VIEW
FRONT VIEW
-
+
*
* + -
- + *
/ , 5
IC
BOTTOM VIEW
FRONT VIEW
OUT
E
IN
IN
E
OUT
CHIP IC
N
N
N
1
N
2-2
2-11
2-13
2-15
2-16
2-16
TOP VIEW
CHIP TR
C
- + *
- + *
B
TOP VIEW
1
1
N
1
N
TOP VIEW
1
N
No.51806
AV-27GFH
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
2-5
components only with manufactures recommended parts.
2-7
2.SPECIFIED VOLTAGE AND WAVEFORM VALUES
2-9
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
(1)Resistors
E
œResistance value
No unit
K
M
N
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
Others
AC indicated
*Electrolytic Capacitors
47/50[Example]:Capacitance value [µF]/withstand voltage[V]
STANDARD CIRCUIT DIAGRAM
/z
œType
No indication
MY
MM
PP
MPP
MF
TF
BP
TAN
: Color bar signal
(3)Coils
No unit
positions
of
Others
(4)Power Supply
:Original setting position
when shipped
:DC 20k¶/V
:H
Ë 20µS/div
*Respective voltage values are indicated
:V
Ë 5mS/div
(5)Test point
:Others Ë Sweeping time is
specified
(6)Connecting method
:All DC voltage values
(7)Ground symbol
:R1209¨R209
5.NOTE FOR REPAIRING SERVICE
:[¶]
This model’s power circuit is partly different in the GND. The
:[K¶]
difference of the GND is shown by the LIVE : () side GND and the
:[M¶]
ISOLATED(NEUTRAL) : () side GND. Therefore, care must be
taken for the following points.
:1/10 [W]
(1)Do not touch the LIVE side GND or the LIVE side GND and the
:As specified
ISOLATED(NEUTRAL) side GND simultaneously. If the above
caution is not respected, an electric shock may be caused.
:Carbon resistor
Therefore, make sure that the power cord is surely removed from
:Oxide metal film resistor
the receptacle when, for example, the chassis is pulled out.
:Metal film resistor
(2)Do
:Metal plate resistor
ISOLATED(NEUTRAL) side GND or never measure with a
:Uninflammable resistor
measuring apparatus ( oscilloscope, etc.) the LIVE side GND and
:Fusible resistor
ISOLATED(NEUTRAL) side GND at the same time. If the above
precaution is not respected , a fuse or any parts will be broken.
ž Since the circuit diagram is a standard one, the circuit and
:[pF]
circuit constants may be subject to change for improvement
:[µF]
without any notice.
ž NOTE
:DC50[V]
Due improvement in performance, some part numbers show
:DC withstand voltage [V]
in the circuit diagram may not agree with those indicated in
:AC withstand voltage [V]
the part list.
When ordering parts, please use the numbers that appear in
the Parts List.
No.51806
AV-27GFH
: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
:LIVE side ground
:ISOLATED(NEUTRAL) side ground
:EARTH ground
:DIGITAL ground
not
short
between
the
LIVE
side
GND
and
Jun. 2001 No.51806
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