Sony ICF-M88B Service Manual ▷ View online
ICF-M88B
9
9
Adjustment Location:
T1
AM IF Adjustment
L1
AM VCO Voltage Adjustment
FM Tracking Adjustment
CT2
L2
L2
AM Tracking Adjustment
CT1
ANT1
ANT1
– MAIN BOARD (Component Side) –
– MAIN BOARD (Conductor Side) –
IC1
TP15
(AF GND)
TP10
(RF GND)
TP13
(FM IN)
TP9
(VT)
TP12
(SP OUT)
TP8
(GND)
IC2
ICF-M88B
10
10
SECTION 6
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.
•
z
: Through hole.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
•
: Carbon pattern.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side) the parts face are indicated.
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 3 V and fed with regulated dc power
supply from battery terminal.
supply from battery terminal.
•
Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM/AM
under no-signal (detuned) conditions.
no mark : FM/AM
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
•
Waveforms are 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 numbers refer to waveforms.
•
Signal path.
F
: FM
f
: AM
6-1. PRINTED WIRING BOARDS – TUNER Section –
:Uses unleaded solder.
R21
R17
C36
R19
C40
C38
R3
C9
R24
JC4
JC9
R5
C12
C28
R11
R20
C44
C45
C2
R2
C3
C6
C14
R13
C4
R7
JC12
JC11
JC10
C35
C8
R25
C11
JC3
C32
C30
C26
R9
R10
R4
C10
C39
C37
C42
C43
R1
C47
C46
L4
D1
IC2
IC1
D2
KA
D3
KA
Q3
BC
E
C16
C20
C23
C24
JC5
R6
R14
C15
C29
C19
C13
R8
R12
JC8
R23
JC6
EC
B
EC
B
Q2
Q1
D4
X1
1
1
3
8
JW1
JW2
JW3
C22
C34
+
+
C31
+
CT1
L1
L1
JW7
JW6
JW4
JW8
CF3
L3
L2
CT2
C27
BPF1
+
T1
CF1
CF2
C21
C17
+
+
+
C18
C25
+
RV1
MAIN BOARD
(11)
11
1-862-330-
TP8
(GND)
TP12
(SP OUT)
TP9
(VT)
TP15
(AF GND)
TP13
(FM IN)
TP10 (RF GND)
1
1
10
20
11
2
K
A
A
SP1
GRAY
RED
RED
NATURAL
BLK
ANT1
AM FERRITE-ROD
ANTENNA
1
14
1
15
28
3
5
4
1
3
5
4
VOL
A
A
K
KEY BOARD
A
RED
GRY
RED
BLK
GRY
RED
BLK
GRY
RED
GRAY
GRAY
RED
L301
R302
S301
DX/LOCAL BOARD
(11)
11
1-862-331-
ANT2
FM LEAD-WIRE
ANTENNA
FM SENS
LOCAL DX
A
B
C
D
E
1
2
3
4
5
6
•
Semiconductor
Location
Location
Ref. No. Location
D1
D-5
D2
C-4
D3
D-4
D4
C-1
IC1
C-3
IC2
C-5
Q1
C-2
Q2
B-2
Q3
D-4
(Page 12)
ICF-M88B
11
11
6-2. SCHEMATIC DIAGRAM – TUNER Section –
•
See page 14 for Waveform.
•
See page 14 for IC Block Diagrams.
R302
C2
R1
D1
R2
C3
C4
C6
C14
C8
C9
D2
L3
R4
C10
C11
C12
D3
R5
R3
R24
R25
C27
C32
C28
C26
C30
R11
C31
CF3
R10
R9
CF1
CF2
C15
C16
C17
C18
C19
C20
C29
R23
D4
C
1
3
R6
R14
C21
C24
C25
C22
C23
Q3
R13
R12
R8
C34
C37
C36
C39
X1
R17
R21
R20
C42
C43
C
4
4
R19
R7
C45
C46
C47
C38
C35
C40
SP1
TP12
TP15
TP8
ANT2
S301
TP13
TP10
CT1
ANT1
L1
CT2
JC4
L2
JC3
JC9
TP9
RV1
IC2
J
C
10
J
C
11
J
C
12
JC5
JC6
Q1
Q2
T1
JC8
IC1
BPF1
4.7
L301
0.1
µH
0.01
10k
SVC347
1M
220p
220p
10p
3p
1000p
1000p
HVU202A
22k
7p
1000p
1000p
HVU202A
100k
100k
100k
100k
10
6.3V
0.022
3p
0.01
1
47
2.2
35V
35V
470
2.2k
0.01
1
4.7
16V
16V
10
6.3V
0.01
0.22
0.01
4.7k
DAN202UT
47
0
0p
10k
10k
10
6.3V
1
1000
6.3V
6.3V
470
4V
1
2SA1576
10k
4.7k
2.2k
L4
47
µH
470
4V
22p
0.01
22p
75KHz
10k
100k
2.2k
0.1
0.22
2
20
0
p
4.7k
2.2k
1
100p
0.01
100p
4700p
100p
(SP OUT)
(AF GND)
(GND)
(FM IN)
(RF GND)
0
0
0
(VT)
50k
LC72122V
0
0
0
0
0
2SC4081
DTC114TUA
0
CXA1019M
CE
DATA
CLK
DOUT
MUTE
BEEP
VDD
GND
MIX
OUT
F.E
GND
FM
ANT
NC
AM
ANT
FM
RF
REG
FM
OSC
AFC
AM
OSC
VOL
NF
DISCRI
GND
GND
OUT
+B
FILTER
IN
OUT
AGC
AGC
GND
METER
NC
IFIN
IFIN
SELECT
BAND
AM
FM
IF
AFC(W) AFC(J)
DET
AF
RIPPLE
AF
X
X
VSSA
A
A
PD
VSSD
VDD
FM
AM
IN
IN
IN
OUT
IN
OUT
CE
DI
CL
DO
BAND
BO2
BO3
IO1
IO2
IN
IF
ANTENNA
LEAD-WIRE
FM
LOCAL
DX
FM SENS
1
3
2
AM
FERRITE-ROD
ANTENNA
AM
OSC
FM
RF
MUTING
VOL
FM/AM PLL
TONE CONTROL
SWITCH
FM/AM BAND
SELECT SWITCH
AM IFT
FM/AM FRONT-END,
FM/AM IF AMP,DET,
AGC,AF AMP
(Page 13)
ICF-M88B
12
12
6-3. PRINTED WIRING BOARD – PANEL/POWER SUPPLY Section –
: Uses unleaded solder.
C119
S101
S102
T101
+
S107
S104
S105
S108
S109
1
BLK
GRY
RED
RED
GRY
BLK
RED
GRY
BLK
RED
GRY
RED
GRY
8
LCD101
LIQUID CRYSTAL DISPLAY
KEY BOARD
(COMPONENT SIDE)
1-862-332-
R104
R110
R126
C118
(LCD BACK LIGHT)
R109
R129
Q103
BC
E
R189
R146
R190
R103
R102
C107
R101
C105
JC102
R108
R105
C108
C122
C104
R144
R145
C102
C128
R138
L101
R128
C136
C142
C141
C140
C126
C146
C135
R179
C138
C124
C125
R139
C139
R143
R140
R178
C133
R106
R112
R107
R116
R115
R114
C112
R117
R123
C103
C101
R134
R133
R135
R136
R141
C121
C143
C131
C129
C130
R118
R119
R120
R121
R122
C116
C115
C114
C111
R124
C154
R187
R127
C152
R188
IC102
IC104
D101
D109
K
A
KA
D102
KA
IC103
IC101
C157
R184
C156
C149
R182
C155
C158
R183
R180
R111
C117
C109
R185
R186
R181
L104
Q106
Q107
B C E
E
C
B
E C B
Q104
E C B
Q105
IC105
D103
A
K
D104
AK
Q101
Q102
B C E
BC
E
KEY BOARD
(CONDUCTOR SIDE)
(11)
11
1-862-332-
X102
X101
D106
D105
+
C127
C151
+
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
2PCS. 3V
SENSOR
UNIT
MAIN
BOARD
A
1
15
16
30
RADIO POWER
RESET
LIGHT
ENTER/SELECT
TUNE MODE
BAND/SET
(11)
11
+
–
S103
MODE/FREEZE
S106
1
2
4
3
TP115
(KS1)
TP117
(KR3)
TP116
(KS0)
1
20
60
41
21
40
80
61
1
4
8
5
1
2
4
3
1
2
4
3
(LCD BACK LIGHT)
A
B
C
D
E
F
G
H
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
(Page 10)
•
Semiconductor
Location
Location
Ref. No. Location
D101
B-14
D102
D-14
D103
B-10
D104
C-10
D105
B-15
D106
B-10
D109
B-14
IC101
C-12
IC102
C-14
IC103
D-14
IC104
D-14
IC105
C-11
Q101
C-9
Q102
C-9
Q103
B-15
Q104
B-12
Q105
B-12
Q106
A-13
Q107
A-13
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