Schematic Diagram - Sony SRF-18 Service Manual

SRF-18
3-2.

SCHEMATIC DIAGRAM

• See page 8 for IC Block Diagrams.
1 2 3
MAIN BOARD
A
VCC
C103 C102 L101 C106
10p 10p FM RF 2p
B
CT101-2, L101 CT101-4, L103
FM TRACKING AM FREQUENCY
COVERAGE
ANT1
FM TELESCOPIC
C135
ANTENNA
1000p
JW109
C
TP
BPF101
(FM_IN)
W101 JW106 SL001
BPF
O I
G
GND
JC102
0
D
IC B/D
IC101
FM/AM RF AMP,
MIX, VCO, MPX
IC101
CXA1129N
E
L105
AM
FERRITE-ROD
ANTENNA
HOT
CT101-3, L105
CEN
AM TRACKING
F
REG
R108 C139
330 22p
CT101-1
CV101
TUNING
G
D101
JC101
MC2837
0
C134
220p
H
R451
220k
I
R_IN
R452
220k
R431
220k
L_IN
J401
R432
AUDIO IN
220k
J
C431 C451
4700p 4700p
GND
SRF-18
4 5 6 7
VCC
JW107
L103
JW108
AM OSC
R102
L102
C105 C112
FM 2.2k L104
100p C136 VCO 4700p
2nd
0.01
OSC
FM
R103
FM 2ND VCO
C108
1.5k
OSC D102
1500p
L-1154HD
TUNE
TP
FM C109 C113
2ND 1 0.22
C110
OSC
0.22
R104
C111
R101
3.3k
1
220
C104
4.7 TP
(VCO)
25V
C114 C115
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
0.015 1000p
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
C120
C142
1
220p
C128 C129 C133
S101
6.8 1 1
JW105
10V
R109 FM
0
TP
MPX
(DET)
AM
C124 C132
47p 1
R106
R105
-1 -2
10k
C123 JW104
10
220p
C127
1
CV101-1
L106
FM 1st OSC
CT101-1, L106
FM FREQUENCY C126 C125
1 100
COVERAGE
6.3V TP
(GND)
R434 R454
2.2k 2.2k
C455
1
R455
0.3
C453
100k
1
0.3
Q451
DSC500100L C435
0
1
R435
C433 0.3
100k
1
0.3 Q431, 451
LINE AMP
Q431
DSC500100L
0
R436 R456 C402
10 10 0.01
8 9 10 11
R301
100
JW301
R351
15k
JW303
C331
R331
15k
JW302
C301 C302
22 0.01
10V
RCH
LCH
C116 C117
0.015 1000p JW110 JW111
R131 R151
33k 33k
C201
JW112
22
JW102 10V
JW103
C251
1
RCH
R232
C231
47k
LCH 1
S501
POWER
R107
2.2
RADIO
GND
AUDIO IN
OFF
R201
100
JW101 -1 -2
JW202
R401
100
-3 -4
JW502
JW503
C401
22
10V
10 10
12 13 14
R332 R352
2.2k 2.2k
C353
R355
1
0
R353
0.9
C351
68k
1
0.6
Q351
DSC500100L C333
R335
0
1
0
R333 0.9
68k
1
0.6
Q331, 351
LINE AMP
Q331
DSC500100L
0
R334 R354
22 22
R302
0
JW304
R202
2.2k
R203
0
C205
C203
1
22 C204 C257
10V 1 1
C258
1
RCH
C202 R231 R251
1 47 47
R252
2.7
47k
2.5
16 15 14 13 12 11 10 9
Q251 C255
1
DSC500100L
1.9
Q231, 251
LINE AMP
R253 C252
2.2k 1
1 2 3 4 5 6 7 8
IC B/D
IC201
2.7
POWER AMP
2.5
IC201
CXA1522N C238
Q231 C235 1
1
DSC500100L LCH
1.9
C237 C209
1 22
R233 C232 10V
2.2k 1
GND GND
C206
470
4V
JW201
L201
38uH
TH501
JW501
D501
1N4002-B5
15 16 17
ROUT
J301
LOUT
AUDIO OUT
GND
1 RV201
2 50k
VOL
3
R204
2.2k
C259
220
4V
SPR
SPR W203
(R-ch)
SPRG W204
C207
1
SP1
R254 R255
CABINET
150 0 HPR
(FRONT)
SUB ASSY
AMP VCC
SPL
SPL W201
(L-ch)
SPLG W202
C239
220
R234 R235
4V
HPL
150 0
J201
R205
GND GND
0
TOTAL CURRENT
FM VOLUME MAX: 38mA
FM VOLUME MIN: 24mA
AM VOLUME MAX: 22mA
FM VOLUME MIN: 18mA
TP (BATT+) AUDIO IN: 6mA
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION LR6)
2PCS. 3V
TP (BATT–)
JC501
0
GND