Sony ICF-S79W Service Manual ▷ View online
ICF-S79W
ICF-S79W
9
9
R9
C17
C23
C3
R2
C1
R16
R94
R15
C14
C9
C25
C12
C106
R10
C75
C107
C99
BPF1
JC30
C27
C113
C103
C120
C104
R20
C105
C88
C94
C95
C39
R31
C36
C43
C111
C112
R93
R92
R5
R30
R27
R25
R26
R34
R89
C41
R32
C42
C52
C47
C48
C53
C110
C109
C65
C102
C108
JC14
JC3
R91
R47
R48
R90
C92
C44
C96
C116
C118
JC13
C89
C91
C40
JC9
C121
L9
R19
JC29
R1
R34
C32
R36
R44
R43
C79
R66
R41
R38
R39
C55
C117
R67
R24
JC27
R68
R70
R69
R72
R71
R74
R73
R76
R75
R78
R77
R80
R79
R82
R81
R84
R83
C84
C80
C81
C82
R42
R4
C4
C122
C8
R8
C18
C19
R10
C21
R11
C119
C22
R3
C2
R33
R35
C6
C11
D3
D4
BCE
Q5
BCE
Q4
C63
C62
C78
C57
C58
L8
R40
R64
L10
C60
C76
R60
C115
C114
R59
R58
R65
C73
C72
C71
C70
C69
C68
C67
C66
JC11
C101
R29
R45
R46
R28
R57
R56
R54
R52
R53
R51
C100
R55
16
1
9
8
IC1
LCD1
JW6
JW4
ECB
Q15
ECB
Q16
ECB
Q8
ECB
Q7
ECB
Q9
ECB
Q14
ECB
Q2
D13
A
K
D12
A
K
JW2
ECB
Q13
1
18
IC6
1
3
28
29
15
14
42
43
JC10
JC5
JC6
JC7
C86
R48
R50
R87
R85
R86
C87
4
1
3
2
IC5
4
1
3
2
IC4
1
3
2
IC3
JW3
D5
1
14
28
15
IC2
ECB
Q3
RV1
X1
T2
C56
+
C64
+
C50
+
C54
+
C46
+
C45
+
C51
+
C38
+
C98
+
C13
+
CT1
CT2
L4
L3
C33
+
D2
K
A
D11
K
A
D10
K
A
D1
K
A
A
K
A
K
C20
C5
C59
Q11
Q12
IC7
D6
MAIN BOARD
(CONDUCTOR SIDE)
1-718-070-
(13)
13
CF2
CF3
T1
L6
CF1
JW1
L11
L2
L1
L5
L7
A
A
K
TP
(VT)
CT3
A
A
A/K
ANT1
SP1
RED
WHT
TP
(GND)
BAND PASS FILTER
1
5
2B 2E 1E
2C 1B 1C
2B 2E 1E
2C1B 1C
DRY BATTERY
SIZE “C”
(IEC DESIGNATION LR4)
3PC 4.5V
WHT
RED
VOL
LIQUID CRYSTAL DISPLAY
9
1
A
KEY BOARD
1
3
2
AM FERRITE-ROD
ANTENNA
WB/FM
LEADWIRE
ANTENNA
A
B
C
D
E
F
G
H
1
2
3
4
5
6
7
8
(Page 10)
5-3. PRINTED WIRING BOARD - MAIN Board (Conductor Side) -
•
: Uses unleaded solder.
Ref. No. Location
• Semiconductor
Location
D1
B-2
D2
B-2
D3
B-2
D4
A-2
D5
G-2
D6
H-6
D10
B-3
D11
B-3
D12
C-7
D13
C-7
IC1
C-2
IC2
E-7
IC3
C-7
IC4
C-6
IC5
C-6
IC6
B-5
IC7
F-5
Q2
B-7
Q3
G-7
Q4
B-3
Q5
A-3
Q7
E-5
Q8
E-5
Q9
E-5
Q11
C-4
Q12
B-4
Q13
D-7
Q14
C-6
Q15
E-5
Q16
D-5
ICF-S79W
ICF-S79W
10
10
S109
S101
S112
S110
S111
S107
S113
S106
S105
S104
S103
S102
KEY BOARD
1-676-961-
(11)
11
S108
RADIO ON
1
2
3
4
5
OFF
BAND
WEATHER
CLOCK
–
+
SELECT /
RESET TUNING/PRESET TIMER
PRESET
TUNE/TIMER ADJUST
TIME ADJUST
TIMER
SET/ON/OFF
9
1
A
MAIN
BOARD
A
B
C
D
1
2
3
4
5
6
7
5-4. PRINTED WIRING BOARD - KEY Board -
•
: Uses unleaded solder.
(Page 9)
IC2 CXA1019M
FM FE
TUNING METER
AM IF DET AGC
AF POWER AMP
FM IF
FM/AM
IF OUT
FM RF IN
FE GND
NC
AM RF IN
FM RF
FM OSC
REG OUT
AFC
AM OSC
NF
VOL
FM DISCRI
GND
FM/AM BAND
SELECT
FM IF IN
AM IF IN
NC
METER
IF GND
DET
OUT
AFC AGC
AFC AGC
AF IN
RIPPLE FIL
TER
AF OUT
VCC
GND
AM FE
FM
DISCRIMINATOR
14
13
11
9
8
7
2
1
6
5
3
4
15
16
17
18
19
20
21
22
23
24
25
26
27
28
12
10
• Waveforms
– MAIN Board –
– MAIN Board –
IC6 XG (XOUT)
500 mV/DIV, 5
μs/DIV
13.4
μs
1.8 Vp-p
Q11-1 (Base), -2 (Collector)
200 mV/DIV, 100 ns/DIV
320 ns
680 mVp-p
Q11-1 (Collector)
2 V/DIV, 100 ns/DIV
322 ns
5.4 Vp-p
• IC Block Diagrams
– MAIN Board –
– MAIN Board –
IC1 TA2030FN (EL)
MIX OUT
OSC OUT
FM OSC
TV OSC
VCC
FM RF
TV RF
GND
TV IN
TV BY
RF GND
FM BY
FM IN
MODE SW
PW SW
IF OUT
16 15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TV
OSC
BUFFER
MIX
FM RF
AMP
IF
AMP
POWER/MODE
SWITCH
TV RF
AMP
BUFFER
FM
OSC
ICF-S79W
11
• IC Pin Function Description
MAIN BOARD IC6 μPD17072GB-579-1A7-A (SYSTEM CONTROLLER, LCD DRIVER, KEY CONTROL)
MAIN BOARD IC6 μPD17072GB-579-1A7-A (SYSTEM CONTROLLER, LCD DRIVER, KEY CONTROL)
Pin No.
Pin Name
I/O
Description
1
INIT OUT
O
Initialize signal output for the destination select
2
POWER
O
Radio power on/off control signal output terminal “H”: power on
3
MUTE
O
Muting on/off control signal output “L”: muting on
4
AL LEVEL
O
Beep sound level variable output terminal Not used
5
NC
O
Not used
6 to 9
KS0 to KS3
O
Key strobe signal output terminal
10 to 13
KR0 to KR3
I
Key return signal input terminal
14
BAND1
O
Band select signal output terminal “L”: FM, WEATHER bands, “H”: AM band
15
BAND2
O
Band select signal output terminal “L”: FM, AM bands, “H”: WEATHER band
16
V AMP
-
Power supply terminal for buffer amplifi er
17
NC
O
Not used
18
GND
-
Ground terminal
19
EO
O
PLL error signal output terminal
20
VCOL
I
AM input terminal
21
VCOH
I
FM, WEATHER VCO input terminal
22
VREG1
-
Power supply terminal (connected to the coupling capacitor)
23
VDD
-
Power supply terminal (+2.2 V)
24
XOUT
O
System clock output terminal (75 kHz)
25
XIN
I
System clock input terminal (75 kHz)
26
VREG2
-
Power supply terminal (connected to the coupling capacitor)
27
VLCD0
-
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive
voltage
voltage
28
CAP0
-
29
CAP1
-
30
VLCD2
-
31 to 34
COM0 to COM3
O
Common drive signal output to the liquid crystal display
35 to 48
LCD0 to LCD13
O
Segment drive signal output to the liquid crystal display
49
LCD14
O
Segment drive signal output terminal Not used
50
CE
I
Power failure detection signal input terminal Normally: “H”
51
INT
I
Not used
52
BEEP
O
Beep sound drive signal output terminal
53
VDET
I
Power failure detection signal input terminal Normally: “H”
54
PB1
I
Initialize signal input for the destination select Fixed at “L”
55
PB2
I
Initialize signal input for the destination select Fixed at “L”
56
PB3
I
Initialize signal input for the destination select Fixed at “L”
12
ICF-S79W
SECTION 6
EXPLODED VIEW
1
X-2189-597-1 CABINET
(FRONT)
ASSY
2
3-016-880-01 PLATE (BUTTON), SHEET
* 3
3-016-863-01 CHASSIS
4
A-1536-191-A MAIN BOARD, COMPLETE
6
3-016-875-02 SHEET (BATTERY) (A)
7
3-016-869-02 TERMINAL (+), BATTERY
8
3-016-861-01 CABINET
(REAR)
9
3-016-871-01 TERMINAL
(+.
−) (A), BATTERY
10
3-016-872-01 TERMINAL
(+.
−) (B), BATTERY
11
3-016-870-01 TERMINAL (–), BATTERY
13
3-016-876-02 SHEET (BATTERY) (B)
14
3-368-852-01 FOOT
15
3-016-862-01 LID, BATTERY CASE
16
3-016-867-01 SPRING,
SP
17
3-016-873-01 SPRING,
RING
18
3-016-864-01 KNOB
(VOL)
19
3-043-481-01 SHEET (B), INSULATING
20
3-043-482-01 INSULATING SHEET (A)
21
3-043-480-01 SHEET (C), INSULATING
* 22
1-676-961-11 KEY BOARD
ANT1
1-754-372-11 ANTENNA, FM WIRE
(WB/FM LEADWIRE ANTENNA)
SP1
1-504-918-13 SPEAKER (7.7 cm)
LCD1
1-801-854-11 DISPLAY PANEL, LIQUID CRYSTAL
#1
7-685-552-14 SCREW +BTP 3X25 TYPE2 N-S
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.
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)
R
R
Parts of Color Cabinet’s Color
• Accessories are given in the last of the
electrical parts list.
not supplied
ANT1
#1
LCD1
SP1
11
1
2
3
22
4
6
7
8
9
10
13
14
15
16
17
18
not supplied
not supplied
not supplied
not supplied
not supplied
not supplied
not supplied
not
supplied
supplied
19
20
21
not supplied
not supplied
MAIN board
Click on the first or last page to see other ICF-S79W service manuals if exist.