Sony ICF-C492 Service Manual ▷ View online
ICF-C492
9
9
ICF-C492
SECTION 5
DIAGRAMS
•
Note for Printed Wiring Boards and Schematic Diagrams
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
• W
: indicates side identified with part number.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
Note on Schematic Diagram:
•
All capacitors are in
µ
F unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
•
All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
• C
: panel designation.
• A
: B+ Line.
• H
: adjustment for repair.
•
Power voltage is dc 9 V and fed with regulated dc power
supply from battery terminal or AC input.
supply from battery terminal or AC input.
•
Voltages and waveform are dc with respect to ground un-
der no-signal (detuned) conditions.
no mark : clock
(
der no-signal (detuned) conditions.
no mark : clock
(
) : FM
[
] : AM
〈〈
〉〉
: DC 9V input (AC off)
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
•
Waveform is taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
Voltage variations may be noted due to normal produc-
tion tolerances.
•
Circled number refer to waveform.
•
Signal path.
F
: FM
f
: AM
•
Abbreviation
KR
KR
: Korean model
SP
: Singapore model
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
line with mark 0 are critical for safety.
Replace only with part number specified.
•
Waveform
– MAIN Board –
1
IC101
qh
(CR OSC)
(DC 9V input (AC off))
2 V/DIV, 200
µ
s/DIV
420
µ
s
3.5 Vp-p
Ver. 1.2
ICF-C492
10
10
ICF-C492
•
Semiconductor
Location
Location
Ref. No. Location
D1
F-9
D2
F-9
D101
D-7
D105
C-1
D106
D-3
D107
D-3
D109
C-5
D302
F-6
D303
F-6
D305
E-8
IC1
E-11
IC101
C-8
Q1
C-13
Q2
F-8
Q101
D-6
Q102
D-6
Q103
E-8
Q106
C-2
Q301
E-9
5-1. PRINTED WIRING BOARD – MAIN Board –
: Uses unleaded solder.
+
FAST
–
ALARM TIME/CLOCK SET
JC302
R129
C119
C118
C107
C117
C106
R115
R120
R136
R101
C116
R104
C114
R128
C110
R111
R157
R14
R113
R301
R127
R306
R307
C108
C303
C304
R118
C105
R114
C104
R112
C145
C103
C123
C24
C20
C19
C14
C16
C115
C4
C8
C31
C3
C12
C1
C6
C7
R7
R8
R4
R9
R116
R15
R5
R6
R13
R12
R3
C11
C29
C32
C25
R10
R117
R119
R121
R123
R126
JC102
JC101
JC2
JC103
E C B
Q101
Q102
B C E
JC108
C112
JC105
R109
C113
R130
R106
R107
R135
Q106
B C E
E C B
Q103
E C B
Q301
Q1
B C E
MAIN BOARD
1-865-186-
(11)
11
1
18
S105
JC1
SNOOZE
S109
–
S103
S104
RV2
D106
D109
D107
JW112
JW124
JW102
JW117
JW106
JW115
JW107
JW100
JW111
(KR)
JW101
JW110
JW113
S102
BLIGHTNESS
C27
C302
JW109
JW119
JW105
JW123
JW2
JW1
JW3
JW108
JW114
D105
JW118
D101
D303
D302
D305
D2
D1
1
4
C21
C17
C18
C22
C111
C26
C13
IC101
L102
L101
R304
R305
PS301
IC1
1
15
30
16
CN302
1
2
8
9
CN102
CF2
CF1
CF3
CN2
L4
AM OSC
L3
FM OSC
L2
FM RF
Q2
T1
AM IF
C301
RV1
1
28
14
15
+
(SP)
+
+
+
+
+
+
+
+
W1
FM LEAD
ANTENNA
+
–2
–1
HOLD T RADIO T BUZZER T CLOCK
D100
LED DISPLAY UNIT
CN107
(SHIELD PLATE)
FM
r
AM
1
2
FAST
–
A
B
C
D
E
F
G
H
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
C
POWER
BOARD
B
BUZZER
BOARD
4
1
A
KEY
BOARD
TP (FM ANT)
BLK
RED
NATURAL
L1
AM FERRITE-ROD ANTENNA
CV1
TUNE
S1
BAND
VOL
CT1-1
CV1-1
CT1-4
CV1-4
CT1-3
CV1-3
CT1-2
CV1-2
SP1
–
+
1
2
TIME SET
Ver. 1.2
ICF-C492
11
11
ICF-C492
5-2. PRINTED WIRING BOARDS – KEY/BUZZER/POWER Boards –
: Uses unleaded solder.
A
MAIN BOARD
CN102
–1
–2
OFF t RADIO t BUZZER t RADIO + BUZZER
SLEEP
KEY BOARD
1-865-187-
(11)
11
R143
R131
R108
R132
R139
R124
R125
R122
C124
R150
1
9
D108
D104
D103
D102
S106
RADIO OFF
ALARM RESET
S107
RADIO ON
S108
S101
(ALARM MODE)
POWER BOARD
1-865-188-
(11)
11
TML301
TML302
C
MAIN BOARD
CN302
1
4
T301
POWER TRANSFORMER
P301
(AC IN)
BUZZER BOARD
1-865-189-
(11)
11
ALARM VOL
B
MAIN BOARD
1
4
S1
HIGH t LOW
DRY BATTERY
SIZE “6F22”
(IEC DESIGNATION 6F22)
1PC. 9V
RED
BLK
A
B
C
D
E
F
G
1
2
3
4
5
6
7
8
ICF-C492
12
12
ICF-C492
5-3. SCHEMATIC DIAGRAM
The components identified by mark
0
or dotted
line with mark
0
are critical for safety.
Replace only with part number specified.
C113
JC105
D106
C112
JW124
R135
R130
R307
R306
C303
C304
D302
D303
R304
R305
C301
PS301
Q103
C115
R113
R301
C27
R14
D305
JW123
JW2
CN2
C26
C22
C32
C25
C24
C21
C17
C18
CF2
CF1
JW1
C16
R12
C31
C12
JC2
C1
D2
D1
C29
R9
R10
R8
C14
C13
R7
R6
C3
CT1-1
CV1-1
C4
CT1-2
CV1-2
CT1-3
CV1-3
C7
C6
L4
CT1-4
CV1-4
C8
C11
R15
R5
JC1
JW3
D109
JW102
JW115
JW105
C116
R101
JW117
R104
C114
R136
R111
R106
R107
R109
R118
JW108
JW114
JW109
JW110
C104
C111
C103
C123
C145
R112
JC102
R114
R115
C105
C106
C117
C107
C118 C119
JW111
JW101
C110
R128
C108
JW106
JW107
JC103
R120
JC108
S105
S104
S103
R126
JW118
R121
R123
R117
R119
R116
R129
JW112
JW113
T301
S111
SP1
C124
R122
R139
R150
R125
D104
D108
R131
R132
D102
D103
R108
R143
IC1
CF3
D105
R127
D107
JC302
JW100
R157
R124
T1
R4
L2
L3
R3
L1
W1
TML301
TML302
TP
L101
L102
CN107
IC101
CN102
Q1
C19
Q301
Q102
D101
Q101
Q106
S109
CN302
JW119
Q2
C302
R13
C15
JC101
C20
S101(2/2)
S101(1/2)
RV2
P301
RV1
S1
S107
S106
S108
0.01
0
1SS119
0.01
4.7k
2.2k
0
0
0.01
0.01
1SS133
1N4002B
220
1/2W
220
1/2W
470
25V
25V
2SC4154TP-1EF
0.01
47k
100k
220
10V
10V
1k
1SS133
2P
100
10V
10V
470
10V
10V
1
1
1
22
25V
4.7
50V
50V
10
50V
0.01
2.2k
0.01
0.01
0
100p
1SS133
1SS133
100p
4.7k
22k
47
1000p
10
50V
0
1k
2p
22p
22p
5p
4p
0.01
22k
10k
0
1SS133
0.1
10k
47k
1
10k
10k
47k
2.2k
22k
1k
0.01
100
16V
16V
1000p
2200p
1M
220k
0
47k
100k
0.1
0.01
100p
1000p 0.01
0.01
0.1
1k
0.01
0
1k
0
47k
100k
100k
100k
47k
47k
100
0.01
47k
100
10k
10k
1SS133
1SS133
100
100
1SS133
1SS133
470
470
CXA1019S
MTZJ-13B
1M
1SS119
0
0
10k
4.7k
4.7k
18P
LM8562
9P
2SA1602TP-1EF
0.022
2SA1602TP
-1EF
RT1N241M-TP-1
1SS133
2SC4154TP-1EF
2SA1602TP
-1EF
4P
KTC3203Y-AT
1000
10V
470
1
50V
0
0.1
100k
50k
POWER
TRANSFORMER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
D100
GND
GND
FM
NF
VOL
AM
AFC
FM
REG
FM
AM
NC
FM
FE
FM/AM
DISCRI
OSC
OSC
OUT
RF
RF
IN
IN
GND
IF/OUT
GND
GND
OUT
VCC
FILTER
IN
OUT
AGC
AGC
GND
METER
NC
IN
IN
SELECT
AF
RIPPLE
AF
DET
AFC
AFC
IF
IF
FM
IF
AM
BAND
FM/AM
VDD
DIMMER
SELECT
INPUT
INPUT
INPUT
SET
OUTPUT
OUTPUT
OUTPUT
DOWN
OSC
RT-TIME
MODE
50/60MHz
ON/OFF
TIME
SELECT
ALM-1
ALM-2
ALM
RADIO
SPEED
POWER
CR
HR AG&DE
HR B
C&HR E
HR B&G
HR C&D
HR A&F
A&F
B&G
10'S HR
10'S MIN
10'S MIN
C&D
10'S MIN
10'S MIN
E&MIN E
MIN B&G
MIN C&D
MIN A&F
COL OUT
SLP/SNZ
PM10'S
AM10'S
(SP)
(KR)
AM IF
IN
RF
AM OSC
FM
OSC
FM
RF
AM
FERRITE-ROD
ANTENNA
ANTENNA
FM LEAD
LED DISPLAY UNIT
(FM ANT)
MODE CONTROL,
LED DRIVER
VDD
1
9
FM/AM FRONT END,
FM/AM IF AMP,
DET,AGC,AF AMP
MUTING
VOL
TUNE
CV1
BAND
FM
AM
1
4
1
4
HIGH
LOW
ALARM VOL
DRY BATTERY
SIZE"6F22"
(IEC DESIGNATION 6F22)
1PC. 9V
POWER BACK UP
FOR CLOCK
AC IN
DETECT
DETECT
DC IN
RIPPLE FILTER
BUZZER ON SWITCH
(TIMER)
DIMMER
BRIGHTNESS
FAST
-
FAST
+
+
TIME SET
1
18
S102
ALARM TIME/CLOCK SET
CLOCK
BUZZER
RADIO
HOLD
-2
-1
(ALARM MODE)
RADIO+BUZZER BUZZER RADIO OFF
(ALARM MODE)
SLEEP
RADIO ON
RADIO OFF
ALARM RESET
4
1
SNOOZE
(AC IN)
RADIO ON SWITCH
•
See page 9 for Waveform.
•
See page 13 for IC Block Diagrams.
Ver. 1.2
Click on the first or last page to see other ICF-C492 service manuals if exist.