Sony SRF-18 Service Manual ▷ View online
SRF-18
SRF-18
9
9
3-1. PRINTED WIRING BOARD
•
: Uses unleaded solder.
+
+
+
+
+
+
+
+
+
+
+
C251
R131
R151
R401
J201
R434
C433
R435
C455
C435
R431
R432
R432
C431
R455
R456
C451
C453
R451
R452
R452
JC501
R436
C402
R454
R251
D501
R231
C231
R252
R232
C252
R233
C235
C232
R253
C255
C134
C124
C123
C139
R108
C142
R109
JC101
JC102
C120
C126
R107
C106
C108
L103
C103
C102
BPF101
C105
C111
R104
C110
R103
C136
C136
R102
R201
C202
C201
C127
R105
C132
C133
C129
C109
C1
13
IC101
C135
R351
L104
R331
R106
C1
16
C1
17
C1
14
C1
15
C1
12
C204
C237
W501
IC201
C238
C258
C207
C205
R204
S101
R202
R203
C257
R301
R234
R254
R235
R255
R205
C302
C351
R355
C353
R352
R353
R353
R302
R332
R354
R333
C331
R334
C333
R335
TH501
D101
Q431
Q451
Q251
Q231
Q331
Q351
JW1
12
JW202
JW502
JW501
JW101
JW503
L106
L101
JW106
JW108
JW107
L102
C125
C128
C401
JW102
JW103
C104
JW109
JW1
10
JW
111
C209
C203
JW105
JW104
JW303
JW302
JW301
JW201
R101
SL101
C259
C239
C206
L201
JW304
C301
W201
W203
RV201
S501
J401
J301
CT101
CV101
CV101
D102
W101
W202 W204
1-885-271-
12
(12)
MAIN BOARD
A
A/K
K
E
C
B
E
C
B
E
C
B
E
C
B
E
C
B
E
C
B
AM
FM
-1
-1
-2
-2
r
S101
3
2
1
VOL
-1
-1
-4
-2
-3
-1
-2
-4
-3
-2
-4
-3
POWER
AUDIO IN
OFF
RADIO
S501
r
r
1
15
16
30
16
1
8
9
AUDIO IN
AUDIO OUT
TUNING
TP
(VCO)
TP
(GND)
TP
(BATT-)
TP
(BATT+)
TP
TP
(DET)
TP
(FM IN)
FM 2ND
OSC
TUNE
NATURAL
BLK
RED
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION LR6)
2PCS. 3V
ANT1
FM TELESCOPIC
ANTENNA
L105
AM FERRITE-ROD
ANTENNA
BRN
RED
i
(L-ch)
SP1
CABINET (FRONT)
SUB ASSY
(R-ch)
BRN
BLU
ORG
RED
CT101
-2
-4
-1
-3
CV101
-2
-4
-1
-3
A
B
C
D
1
2
3
4
5
6
7
8
9
SRF-18
SRF-18
10
10
3-2. SCHEMATIC DIAGRAM
• See page 8 for IC Block Diagrams.
IC B/D
IC B/D
TOTAL CURRENT
FM VOLUME MIN: 24mA
AM VOLUME MAX: 22mA
FM VOLUME MIN: 18mA
AUDIO IN: 6mA
FM VOLUME MAX: 38mA
VOLUME MIN: 1.1
1.5
2.9
1.5
1.2
0
VOLUME MAX: 0
0
1.5
1.5
2.6
2.7
1.9
2.5
2.7
1.9
2.5
0.9
0
0.6
0.9
0
0.6
0.3
0
0.3
0.3
0
0.3
FM TRACKING
CT101-2, L101
CT101-4, L103
AM FREQUENCY
COVERAGE
FM 2ND
OSC
FM
VCO
CT101-1, L106
FM FREQUENCY
COVERAGE
AM TRACKING
CT101-3, L105
2.9
2.9
2.9
0
2.9
0 (2.9)
2.7
2.7
2.9
0.5 (0)
0.9
0.9
0
0
2.9
0 (2.9)
2.9
2.9
0 (1.4)
0
0.5
0.4
0.6
2.7
2.7 (2.9)
10p
C103
10p
CV101-2
CT101-2
CV101-4
CT101-4
VCC
VCC
C102
2p
C106
1500p
C108
JW106
W101
JW107
JW301
JW304
JW108
100p
C105
4700p
C112
0.01
C136
2.2k
R102
1.5k
R103
1
C109
0.22
C113
3.3k
R104
1
C111
0.22
C110
L-1154HD
D102
1000p
C135
0
JC102
SL001
GND
JW109
BPF101
BPF I
G
O
MC2837
D101
220p
C134
0
JC101
220p
C123
47p
C124
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
FE GND
AM RF IN
ACC AFC
FM 1ST
OSC
TV 1ST
OSC
+VCC
FM IF
GND
AGC
MUTE
DET
OUT
MPX IN
PD1
PD2
ST
IND
FM RF IN
TV RF IN
+VDD FE
FM RF
IMAGE ADJ
OL
AGC
FM 2ND LOCAL
AM OSC
TUN IND
PLL
1
PLL
2
PLL
VCO
VCO CTRL
R CH
L C
H
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
C120
220p
C142
0
R109
330
R108
22p
C139
CT101-1
CV101-1
REG
CEN
HOT
1
MPX
(VCO)
TP
JW105
JW110
C129
1
C133
1
-1
-2
-2
-1
-4
-3
C132
10k
JW104
JW102
JW101
JW202
JW502
JW503
JW103
R106
10
R105
1
C127
6.8
C128
10V
100
C125
1
C126
6.3V
IC101
FM/AM RF AMP,
MIX, VCO, MPX
CXA1129N
IC101
4.7
C104
220
R101
25V
2.2
R107
100
R401
0.015
C114
33k
R131
JW111
JW112
33k
R151
1000p
C115
0.015
C116
1000p
C117
RCH
RCH
GND
GND
GND
GND
HPL
SPL
HPR
SPR
GND
LOUT
ROUT
LCH
RCH
LCH
GND
LCH
220k
R451
220k
R452
220k
R431
220k
R432
100k
R435
DSC500100L
Q431
L_IN
GND
R_IN
AUDIO IN
J401
4700p
C431
4700p
C451
0.01
C402
10
R436
10
R456
2.2k
R434
2.2k
R454
1
C453
1
C433
100k
R455
DSC500100L
Q451
1
C455
1
C435
22
C401
10V
OFF
AUDIO IN
RADIO
1
C251
1
C231
100
R301
JW303
15k
R351
68k
R333
DSC500100L
Q331
LINE AMP
Q331, 351
1
C331
JW302
15k
R331
22
C301
0.01
C302
10V
22
C201
1
C202
47
R231
47k
R252
2.2k
R253
1
C252
1
C255
DSC500100L
Q251
LINE AMP
Q231, 251
47
R251
10V
IC201
POWER AMP
CXA1522N
IC201
1
2
3
4
5
6
7
8
IN 2 L
NC
NC
NF 2
GND
PGND 2
OUT2
RIPPLE
IN 1 R
REG
VOL
NF 1
GND
PGND 1
OUT1
VCC
16
15
14
13
12
11
10
9
22
C203
10V
C204
1
C257
1
TP (BATT–)
GND
TP (BATT+)
0
JC501
TH501
JW501
1N4002-B5
D501
2.2k
R233
1
C232
DSC500100L
Q231
1
C235
1
C258
1
C238
1
C205
2.2k
R204
2.2k
R202
0
R302
0
R335
0
R355
1
C333
1
C353
0
R203
22
C209
1
C237
10V
470
C206
38uH
L201
JW201
4V
220
C259
4V
220
C239
4V
1
AMP VCC
C207
150
R254
0
R255
150
R234
0
R235
(L-ch)
(R-ch)
0
R205
47k
R232
J201
AUDIO OUT
J301
2.2k
R332
2.2k
R352
22
R334
22
R354
68k
R353
DSC500100L
Q351
1
C351
MAIN BOARD
VOL
50k
1
3
2
RV201
W203
SPR
W204
SPRG
W201
SPL
W202
SPLG
SIZE “AA”
DRY BATTERY
(IEC DESIGNATION LR6)
2PCS. 3V
LINE AMP
Q431, 451
FM TELESCOPIC
ANTENNA
ANT1
FERRITE-ROD
ANTENNA
AM
L105
FM
S101
AM
FM
TP
OSC
2ND
TUNE
TUNING
CV101
POWER
S501
13
11
16
A
3
17
10
8
6
I
E
2
9
G
D
5
J
B
C
7
F
1
4
15
14
12
H
CV101-3
CT101-3
100
R201
(FRONT)
CABINET
SP1
SUB ASSY
(GND)
TP
FM 1st OSC
L106
(DET)
TP
(FM_IN)
TP
VCO
L104
FM
L102
OSC
2nd
AM OSC
L103
FM RF
L101
11
SRF-18
SECTION 4
EXPLODED VIEWS
1
3-846-310-21 SPACER
2
4-412-614-01 ADHESIVE
SHEET
A
3
3-252-825-01 SCREW
(1.7)
4
4-294-737-01 HOLDER (HEADPHONE) (for BLACK)
4
4-294-737-11 HOLDER (HEADPHONE) (for WHITE)
4
4-294-737-21 HOLDER (HEADPHONE) (for PINK)
5
4-294-741-01 TERMINAL (+) BATTERY
6
4-294-740-31 PLATE TRANSPARENT (for BLACK)
6
4-294-740-41 PLATE TRANSPARENT (for WHITE)
6
4-294-740-51 PLATE TRANSPARENT (for PINK)
7
4-412-613-01 SPACER
A
8
4-294-733-01 KNOB (POWER) (for BLACK)
8
4-294-733-11 KNOB (POWER) (for WHITE)
8
4-294-733-21 KNOB (POWER) (for PINK)
9
3-252-825-01 SCREW (1.7) (for WHITE, PINK)
9
3-252-825-11 SCREW (1.7) (for BLACK)
10
4-294-732-01 KNOB (BAND) (for BLACK)
10
4-294-732-11 KNOB (BAND) (for WHITE)
10
4-294-732-21 KNOB (BAND) (for PINK)
SP1
X-2584-348-1 CABINET (FRONT) SUB ASSY
(Including SPEAKER (3.6 cm)) (for BLACK)
SP1
X-2584-349-1 CABINET (FRONT) SUB ASSY
(Including SPEAKER (3.6 cm)) (for WHITE)
SP1
X-2584-350-1 CABINET (FRONT) SUB ASSY
(Including SPEAKER (3.6 cm)) (for PINK)
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
Note:
• -XX and -X mean standardized parts, so
• -XX and -X mean standardized parts, so
they may have some difference from the
original one.
original one.
• Items marked “*” are not stocked since
they are seldom required for routine ser-
vice. Some delay should be anticipated
when ordering these items.
vice. Some delay should be anticipated
when ordering these items.
• The mechanical parts with no reference
number in the exploded views are not sup-
plied.
plied.
• Color Indication of Appearance Parts Ex-
ample:
KNOB, BALANCE (WHITE) . . . (RED)
Parts Color Cabinet’s Color
4-1. FRONT CABINET SECTION
chassis section
4
3
2
3
8
1
9
7
rear cabinet section
5
6
not supplied
not supplied
not supplied
not
supplied
supplied
10
SP1
12
SRF-18
4-2. CHASSIS SECTION
51
4-294-739-01 POINTER
52
4-294-730-02 CHASSIS
53
4-294-736-01 GEAR
(MIDWAY)
54
4-294-734-01 KNOB (TUNE) (for BLACK)
54
4-294-734-11 KNOB (TUNE) (for WHITE)
54
4-294-734-21 KNOB (TUNE) (for PINK)
55
3-877-234-01 WASHER
56
2-582-365-01 CUSHION
(BUTTON)
57
A-1861-503-A MAIN BOARD, COMPLETE
58
4-294-731-02 HOLDER
(FERRITE-ROD
ANTENNA)
59
3-318-201-61 SCREW (B) (1.4X6), TAPPING
60
3-252-825-01 SCREW
(1.7)
61
4-294-742-01 TERMINAL (–) BATTERY
62
4-294-738-01 HOLDER (DC) (for BLACK)
62
4-294-738-11 HOLDER (DC) (for WHITE)
62
4-294-738-21 HOLDER (DC) (for PINK)
63
3-254-148-01 SCREW
(M1.7)
64
4-294-735-01 GEAR
(VC)
D102
6-501-544-01 LED L-1154HD (TUNE)
L105
1-460-469-11 BAR ANTENNA COIL (AM)
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
58
60
61
57
63
52
55
56
54
53
62
51
64
60
60
59
MAIN
board
board
D102
L105
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