Panasonic RF-B20L - Schematic Diagram; Antennas; Main Circuit Section

ai 740) RF-B20L
SCHEMATIC DIAGRAM
MAIN CIRCUIT SECTION
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Q2 Q3 ICI Qs Q10, 1,12 Q22 Q24
(2SKI60K) (2SKI60K) (RVITA7358P) (2scioo9F4) (2sB709s) (28B709s) (2sB709sS) ais Ql4 Q15,16
MW
RF
LW
RF
AF
AMP,
FM
OSC,MIX
FM
IF
SWITCHING
POWER
FM/AM
SWITCHING
(2SA812M5S)
(2SC1623L5A])
(2SCI623L5A)
SWITCHING CF2 DC AMP AF AMP DRIVER
TELESCOPIC
ANTENNA
ic2
(AN7236S)
FM/AM IF AMP, DET,
AF AMP, AM OSC
QI7
(2sc2001K2)
POWER AMP
C45 M0033
ais
(2Sa952K2)
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(4 FM SWITCHING
C70 63V410
Qs
(2sc2295B)
SWI~6 Ist OSC
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& D4~7
(LN247RPLF)
BAND IND
z
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¥
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ca
C27 C1P
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MN4043BS
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1C3,5,6
SWITCHING
©
SWI~6
RFAMP
SWIx6
Ist
MIX
SWI-6
BUFFER
0
Rm
2
Tg
20
Ga
¥
is
QO029
(MN4043BS)
(MN4072BS)
= = OB) (LN2SRPLF) $8 $4 $5 $4 MW/LW/SW/FM MW/LW/SW/FM
. TUNING IND TM MW LW SW SWITCHING SWITCHING
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Cif BATTERY 45V LED CIRCUIT SECTION
(UM- 3x3)
Notes:
7.
S7:
Hold
Switch
in
“OFF”
position.
(1...OFF,
3...ON)
eDescribed
in
schematic
diagram
are
two
types
of
numbers;
the
supply
1. $1-1,$1-2: SW1~6 Band switch in ‘““SW1” position. 8. S8: Power OFF switch. parts number and production parts number for transistors and diodes. One
(1...SW6,
2...SW5,
3...SW4,
5...SW3,6...SW2,
9.
VR1:
Tone
control
VR.
type
number
is
used
for
supply
parts
number
and
production
parts
number
7...SW1) 10. VR2: Volume control VR. which they are identical.
2.
S2-1~S2-4:
DX-Local
Sensitivity
Switch
in
“Local”
position.
|
11.
The
mark
(¥)
shows
test
point
e.g.
=test
point
1.
eg.
Q1
(1...Local, 3...DX) 12. DC voltage measurement are taken with electronics voltmeter from 2SC2412NRTB, LNSTB< Production parts number
3.
S3:
FM
Band
switch
in
‘‘OFF”
position.
negative
terminal
of
battery.
[2SC2412]
<———_—_
Supply
parts
number
4. S4: MW Band switch in ‘“‘OFF” position. < >...FM position, ( )... MW position eThe supply parts number is described alone in the replacement parts list.
5.
S5:
LW
Band
switch
in
“OFF”
position.
((
))...
LW
position,
<<
>>...SW
position
6.
S6:
SW
Band
switch
in
‘‘OFF”
position.
No
mark...FM/MW/LW/SW
position
aajem
+B
Voltage
Line
m=
Radio
(FM)
Signal
Line
13. Battery current: Nosignal ................c0ccceeeeeeeeees 35 mA wily LW Signal Line MW Signal Line
Maximum output ..............0..0e eee 139 mA a0c> SW1~6 Signal Line ===> ist OSC Signal Line
==
—1i10-