Schematic Diagram - Sony ICF-C218 Service Manual

ICF-C218
Ver. 1.1

4-2. SCHEMATIC DIAGRAM

• See page 11 for IC Block Diagrams.
MAIN BOARD
CV1-1-CV1-4
TUNING
L1, CT1-1 CT1-2
AM FM
TRACKING TRACKING
IC1
W104
FM WIRE FM/AM FRONT END,
SP, TH, AUS
ANTENNA IF DET, POWER AMP
TP1
RF IN
TP2
RF GND
R1 R2
15 14 13
2.2k
470
C34
JC
JC3
16 17 18
TP9
BAND
C1
0.01
B
T1 T1
AM IFT
AM IF
10.7MHz
S1
BAND
CF1
455kHz
FM
AM
TP12
C307
100p
CH C&SA, MX
W103
SP1
8Ω
L201
T301
W102
22
AC IN
L301
(PATTERN)
POWER TRANS
L302
(PATTERN)
ICF-C218
• See page 11 for Waveforms.
L3, CT1-3 L4, CT1-4
FM AM
FREQUENCY FREQUENCY
COVERAGE COVERAGE
L4
AM OSC
TP3 REG
Q1
2SA1235TP-1EF
1.3
RV1 MUTE
50k
0.7
VOLUME
1.2
C25
0.1
F
IC B/D
R7
R243
47
C10
TP4
15k
0.01
B
C19
1
F
12 11 10 9 8 7 6 5 4 3 2 1
IC1 CXA1019S
19 20 21 22 23 24 25 26 27 28 29 30
C15
0.1
F C29 C22
1 1
TP8
F F
TP7
DET
DCC
CF2
C13 C17 C20 C24
C9 C11
0.022 47 1 1000
4.7 10
B 10V
50V 50V 10V F
TP10
GND
JW6
C14
220
TP11
10V
SP
C303
1000
10V
L202 22
TP301
JW303
TP302
12.1
C301
Q302
0.01
R302
2SC4154-TP-1EF
B
4.7k
+5V REG
D301
C306
1SS133T-77
47
35V
C308 D303
C302
0.01 MTZJ-T-77-5.6B
0.01 D302
B
JW301 JW302 B IN4002-B5
LED101
LED DISPLAY
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TP101
W105
COM1
TP102
COM0
R10
47k
28 SEG10
S4
29 VSSLED
ALARM MODE
1.3
30 SEG11
OFF RADIO BUZZER
1.1
31 SEG12
1.1
32 SEG13
0.7
33 SEG14
0.8
34 SEG15
0.3
35 SEG16/17
1.0
36 SEG18/19
R239
220k
R204
330k
R240
47k
R205
220k
R202
15k
R201 15k
C201
0.22
F JW207
TP225
Note:
• All capacitors are in µF unless otherwise noted. (p: pF) 50V or
4.8
less are not indicated except for electrolytics and tantalums.
• All resistors are in Ω and
1 / W or less unless otherwise specified.
4
C305
• f : internal component.
5.5
100
• C : panel designation.
10V
C304
220
10V
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
• H : adjustment for repair.
• Voltages are dc with respect to ground under no-signal condi-
tions.
no mark : FM
( ) : AM
10 10
C210 C209
C212
0.01 0.01
27 26 25 24 23 22 21 20 19
0.01
B B
B
SEG0 18
POWER 17
JW202
IC101
0.5
BATT_AD 16
C203
3.0 TP232
LCD DRIVE, INPUT_A 15 22p
4.8 CH
R214
DIGITAL ALARM VDD 14
0
2.3
CLOCK
XT2 13
C204
1.5
XT1 12 22p
TP231 CH
IC101
VSS 11
LC872B06A
BATT_CHK 10
C202
1
F
C205 C208
1 2 3 4 5 6 7 8 9
0.01 0.01
TP233
B B
0.5 RES
R244
TP227
10k
INP-A
JC202
R216
6.8k
R217
R227 R226 R228
10k
1.5k 15k 1.5k
R212 R211 R213 R218
47k 470k 47k 10k
TP104 TP105
SCK SIN
INP2 INP1 R219
22k
R220
R208
*1 R208
33k
*1
S11
220k C&SA, MX, AUS
ALARM TIME SET +
330k SP, TH R241
*2
R209
S12
*2 R241
470k D204 R221
ALARM TIME SET -
0 C&SA, MX, AUS
RB521S-30-TE61 68k
100k SP, TH
R242
0
D205
TP224
RB520S-30-TE61
BATT
TP103
GND
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production toler-
ances.
• Signal path.
F : FM
f : AM
• Abbreviation
SP : Singapore model
TH : Thai model
AUS : Australian model
MX : mexican model
C&SA : Central & South American model
S6
RADIO ON R222
6.8k
S7
SET +
S14
DST
S8
SET -
S9
CLOCK
S10 S15
R223
RADIO OFF
SLEEP
10k
R224
10k
S16
SNOOZE
JW211 JW210
LITHIUM BATTERY
CR2032
1PC .3V
(POWER BACK UP FOR CLOCK)