Sony ICF-M88B Service Manual ▷ View online
ICF-M88B
13
13
R106
IC105
IC104
IC103
R187
R188
R189
R102
R103
R124
D105
D106
R129
R127
C154
R190
D109
C152
D102
R101
R105
R108
R117
C111
C112
R107
R112
C108
C122
R115
R114
R116
R118
R119
R120
R121
R122
C114
C115
C116
C128
C104
X102
R138
C103
C101
D101
R128
R140
R143
R178
R179
C133
C135
Q104
R134
C121
R139
C129
C131
C130
X101
C136
C138
C139
R141
C146
R133
R135
R136
C124
C125
C126
R180
R181
R182
R183
R184
R185
R186
R126
C151
D103
R104
C109
Q101
Q102
D104
R109
C117
R110
R111
C118
C119
Q107
R146
C140
C141
C142
C143
C155
C158
C156
C157
R123
Q106
LCD101
IC101
Q103
C105
JC102
IC102
C127
C102
TP117
Q105
S105
S104
S101
S102
S109
S108
S107
R145
C107
T101
R144
C149
S103
S106
TP116
TP115
10k
S-80817CNNB
S-80819CNNB
S-80821CNNB
1k
1k
1k
470k
470k
100k
SLI-343OUT
SLI-343OUT
100
100
0.1
10k
RB520
0.01
1SS355
2.2M
1M
1M
1k
0.01
0.1
1k
1k
100p
0.01
470k
10k
10k
1k
1k
1k
1k
1k
100p
100p
4700p
22p
22p
32.768KHz
220k
1
1
L101
22
µH
L104
100
µH
RB521S
1M
10k
10k
100k
100k
0.01
0.01
2SA1576
1M
1
1M
10p
10p
22p
4.19MHz
22p
22p
9p
10k
0.01
2.2k
2.2k
2.2k
470p
470p
470p
2.2k
2.2k
2.2k
2.2k
2.2k
2.2k
2.2k
220
2.2
35V
35V
1SS355
1k
10p
2SC4081
2SC4081
UDZSTE-1713B
100k
0.1
100k
47k
1
10
6.3V
2SB970
470k
1
1
1
1
1000p
1000p
1000p
1000p
1k
DTC144TUA
-8BT
µPD789488GC-A35
2SA1576
0.1
0
BR24L01F-WE2
0.047F
5.5V
6p
(KR3)
2SA1576
100k
0.01
1k
100p
(KS0)
(KS1)
COM0
COM1
COM2
COM3
C
O
M
0
CO
M
1
C
O
M
2
C
OM
3
S
0
S
1
S
2
S
3
S
4
S
5
S
6
S
7
S
8
S
9
S
1
0
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
LIQUID CRYSTAL DISPLAY
G
N
D
G
N
D
G
N
D
G
N
D
IN
O
U
T
IN
O
U
T
V
C
C
W
P
C
L
K
D
A
T
A
A
0
A
1
A
2
G
N
D
P65
P64
P63
P62
P61
P60
AVSS
VDET2
VDET1
BEEP
PS
MOUNT
MUTE
P24
P10
CE/PLL
CLK/PLL
DATA/PLL
CLK/EEPRON
DATA/EEPROM
P
0
7
P
O
W
E
R
L
E
D
K
R
3
K
R
2
K
R
1
K
R
0
P
0
0
IC
0
X
T
1
X
T
2
V
D
D
V
S
S
X
1
X
2
R
E
S
E
T
S
H
IF
T
K
S
2
K
S
1
K
S
0
P
6
6
V
E
R
S
IO
N
A
V
D
D
P
8
7
P
8
6
S
2
5
S
2
4
S
2
3
S
2
2
S
2
1
S
2
0
S
1
9
S
1
8
S
1
7
S
1
6
S
1
5
S
1
4
S
1
3
S
1
2
S
1
1
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
COM3
COM2
COM1
COM0
VLC0
VLC1
VLC2
CAPL
CAPH
G
N
D
G
N
D
IN
O
U
T
CE
DATA
CLK
DOUT
MUTE
BEEP
VDD
GND
SYSTEM CONTROLLER
SENSOR
UNIT
(LCD BACK LIGHT)
D105,106
VOLTAGE DETECT
VOLTAGE DETECT
EEPROM
SHIFT
CLOCK
SHIFT
CLOCK
+
-
RESET
TUNE MODE
ENTER/SELECT
MODE/FREEZE
LIGHT
BAND/SET
RADIO POWER
DRY BATTERY
SIZE"AA"
(IEC DESIGNATION R6)
DC/DC
CONVERTER
DC/DC
CONVERTER
Q101,102
Q106,107
POWER ON/OFF
CONTROL SWITCH
LED DRIVE
2PCS. 3V
RESET SIGNAL
GENERATOR
• TOTAL CURRENT
FM: 18mA
AM: 11mA
(NO-SIGNAL CONDITION)
AM: 11mA
(NO-SIGNAL CONDITION)
6-4. SCHEMATIC DIAGRAM – PANEL/POWER SUPPLY Section –
•
See page 14 for Waveforms.
•
See page 15 for IC Pin Function Description.
(Page 11)
ICF-M88B
14
14
263 ns
1.2 Vp-p
263 ns
1.9 Vp-p
239 ns
2.2 Vp-p
30.5
µ
s
2.5 Vp-p
•
Waveforms
– MAIN Board –
13.3
µ
s
1.1 Vp-p
1 V/DIV, 10
µ
s/DIV
1 V/DIV, 100 ns/DIV
1 V/DIV, 100 ns/DIV
500 mV/DIV, 100 ns/DIV
– KEY Board –
500 mV/DIV, 5
µ
s/DIV
IC101
ua
(XT2)
qs
IC101
ug
(X2)
qd
Q101 (Collector)
qf
Q101 (Base),
Q102 (Collector)
Q102 (Collector)
qa
IC2
w;
(X OUT)
1
•
IC Block Diagrams
– MAIN Board –
IC1
CXA1019M-T6
IC2
LC72122V-TLM-E
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 FILTER
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
11
10
9
8
7
6
5
4
3
2
1
12
13
14
15
19
20
UNLOCK
DETECTOR
POWER ON
RESET
UNIVERSAL
COUNTER
CCB
I/F
CE
DI
CL
DO
XOUT
AOUT
XIN
AIN
PD
VSS
VDD
FMIN
AMIN
B01
B02
B03
I01
I02
IFIN
PHASE
DETECTOR
CHARGE
PUMP
REFERENCE
DIVIDER
SWALLOW
COUNTER
1/16,1/17
4BITS
12BITS
PROGRAMMABLE
DIVIDER
DATA SHIFT REGISTER
LATCH
1/2
16
17
18 VSSA
15
ICF-M88B
•
IC Pin Function Description
KEY BOARD IC101
µ
PD789488GC-A35-8BT (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1, 2
CAPH, CAPL
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
3 to 5
VLC2 to VLC0
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
6 to 9
COM0 to COM3
O
Common drive signal output to the liquid crystal display
10 to 35
S0 to S25
O
Segment drive signal output to the liquid crystal display
36, 37
P86, P87
O
Not used
38
AVDD
—
Power supply terminal (+2.41V) (for A/D converter)
39
VERSION
I
Setting terminal for the destination Fixed at “H” in this set
40 to 46
P66 to P60
I
Not used
47
AVSS
—
Ground terminal (for A/D converter)
48
VDET2
I
Voltage detection signal input terminal “L”: 2.1V or less
49
VDET1
I
Voltage detection signal input terminal “L”: 1.9V or less
50
BEEP
O
Beep sound output to the FM/AM front-end
51
PS
I
Pulse signal input terminal for 1 rotation time measurement
52
MOUNT
I
Mount state detection signal input terminal “L”: mount connected, “H”: no connected
53
MUTE
O
Radio output muting on/off control signal output terminal “L”: muting on
54
P24
O
Not used
55
DATA/EEPROM
I/O
Two-way data bus with the EEPROM
56
CLK/EEPROM
O
Serial clock signal output to the EEPROM
57
DATA/PLL
O
Serial data output to the FM/AM PLL
58
CLK/PLL
O
Serial clock signal output to the FM/AM PLL
59
CE/PLL
O
Chip enable signal output to the FM/AM PLL
60, 61
P10, P07
O
Not used
62
POWER
O
Radio power on/off control signal output terminal “H”: power on
63
LED
O
LED drive signal output of the liquid crystal display back light “L”: LED on
64
KR3
I
Key return signal input terminal Not used
65 to 67
KR2 to KR0
I
Key return signal input terminal
68
P00
O
Not used
69
IC0
—
Connected to the ground
70
XT1
I
Sub system clock input terminal (32.768 kHz)
71
XT2
O
Sub system clock output terminal (32.768 kHz)
72
VDD
—
Power supply terminal (+2.4V)
73
VSS
—
Ground terminal
74
X1
I
Main system clock input terminal (4.19 MHz)
75
X2
O
Main system clock output terminal (4.19 MHz)
76
RESET
I
System reset signal input from the reset signal generator “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
77
SHIFT
O
Shift clock on/off control signal output terminal “L”: shift clock on
78 to 80
KS2 to KS0
O
Key source signal output terminal
16
ICF-M88B
SECTION 7
EXPLODED VIEWS
7-1.
CABINET (UPPER) SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
A-4578-032-A BUTTON ASSY
2
1-786-739-11 SWITCH, RUBBER KEY
3
A-4578-030-A CABINET (UPPER) ASSY
4
3-254-083-01 SCREW
5
2-059-726-01 + TAPPING SCREW P1.7X10
SP1
1-825-832-11 SPEAKER (5.0cm)
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference
number in the exploded views are not supplied.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color
Cabinet's Color
1
2
3
4
5
5
not supplied
cabinet (lower) section
chassis section
SP1
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