Sony SRF-M80 Service Manual ▷ View online
SRF-M80
8
8
BASS
BOOST
CONTROL
POWER
AMP
DET
BASS BOOST AMP
IC2
SYSTEM CONTROLLER
IC101
2
1
13
14
S1
FM SENS
B.P.F.
BPF1
LIQUID CRYSTAL DISPLAY
LCD101
VOLTAGE
DETECT
IC102
B+ SWITCH
Q6
DC/DC
CONVERTER
Q104, T101
POWER
AMP
MUTE
CONTROL
RIPPLE FILTER
Q5
KEY MATRIX
S101 – 115
KS0 – KS3
KR0 – KR3
X101
75kHz
SYSTEM CONTROLLER (IC101) B+
FM/AM RF AMP (IC1),
HEADPHONE AMP (IC3) B+
BASS BOOST AMP (IC2) B+
PLL LOW-PASS FILTER CIRCUIT B+
D102
–1
–2
IN2
IN1
HEADPHONE AMP
IC3
2
4
IN1
IN2
OUT2
OUT1
9
7
OUT1
OUT2
LP
GAIN
POWER
XOUT
XIN
CE
BA
TT LOW
DET
IN
MUTE SW
VCOL
VCOH
BAND1
24
HOLD
51
25
1
50
VOLTAGE
DETECT
IC103
53
6
12
10
MUTE
5
M/BASS
4
BEEP
52
16
21
AMP
15
20
EO
19
DX
LOCAL
RV3
VOL
J1
(HEADPHONE)
i
+
DRY BATTERY
SIZE “AAA”
(IEC DESIGNATION R03)
2PCS. 3V
10 – 13
6 – 9
COM0 – COM3
31 – 34
SEG0 – SEG14
35 – 49
25
22
16
18
17
FM
RF AMP
FM
LPF
MPX
DECODER
FM
OSC
AM/FM: 1/2
FMIN
MPXI
ARFI
150kHz
DETO
45kHz
FMRO
AMLO
FTLO
29
IFCT
12
BAND
1
VCO
FM/AM RF AMP,
MIX, OSC, DET, MPX
IC1
AM
OSC
FM
LMT
FM
DET
AGC
AMP
AM
BPF
19
REGV
FMBF
AM
RF AMP
26
+
+
35
LOUT
3
ROUT
4
36
PSN
REGULATOR
VCO
RV2
FM STEREO
RV1
AM IF
L3
CT1, L1
L3
FM RF
AM TRACKING
L1
AM
FERRITE-ROD
ANTENNA
L2
AM OSC
L5
FM OSC
CT1
D3
D2
(1/2)
D2 (2/2)
D5
AM VCO
VOLTAGE
FM TRACKING
BASS BOOST
SWITCH
Q4
LOW-PASS
FILTER
Q101
FM VCO
AMP
Q103
B+
FM VCO
BUFFER
BUFFER
Q1, 102
S117
HOLD
ON
OFF
: FM
: AM
• SIGNAL PATH
SECTION 4
DIAGRAMS
4-1.
BLOCK DIAGRAM
SRF-M80
9
9
4-2.
NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAMS
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 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.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
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.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
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.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
• Waveforms
1
IC101
wf
(XOUT)
2
Q104 Base-1, Collector-2
1.5 Vp-p
13.3
µ
s
340 mVp-p
252 ns
3
Q104 Collector-1
2.9 Vp-p
252 ns
4-3.
IC PIN FUNCTION DESCRIPTION
•
KEY BOARD IC101
µ
PD17073GB-556-1A7 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
POWER
O
Power on/off control signal output for the radio system power supply “H”: power on
2, 3
NC
O
Not used
4
M/BASS
O
MEGA BASS on/off control signal output “H”: MEGA BASS on
5
MUTE
O
Muting on/off control signal output to the headphone amplifier “L”: muting on
6 to 9
KS0 to KS3
O
Key scan signal output for the key matrix
10 to 13
KR0 to KR3
I
Key return signal input for the key matrix
14
NC
O
Not used
15
AMP
O
FM VCO amplifier power on/off control signal output terminal “L”: FM VCO amplifier on
16
BAND
O
FM/AM band selection signal output terminal “L”: AM, “H”: FM
17
NC
O
Not used
18
GND
—
Ground terminal
19
EO
O
PLL error signal output terminal
20
VCOL
I
AM VCO input terminal
21
VCOH
I
FM VCO input terminal
22
VREG0
—
Power supply terminal (connected to the coupling capacitor)
23
VDD
—
Power supply terminal (+3V)
24
XOUT
O
System clock output terminal (75 kHz)
25
XIN
I
System clock input terminal (75 kHz)
26
VREG1
—
Power supply terminal (connected to the coupling capacitor)
27
VLCD0
—
28
CAP0
—
29
CAPS1
—
30
VLCD1
—
31 to 34
COM0 to COM3
O
Common drive signal output to the liquid crystal display
35 to 49
LCD0 to LCD14
O
Segment drive signal output to the liquid crystal display
50
CE
I
Power failure detection signal input from the voltage detect Normally: “H”
51
HOLD
I
Key input terminal
52
BEEP
O
Beep sound drive signal output terminal
53
BATT LOW
I
Battery voltage detection signal input from the voltage detect Normally: “H”
54
NC
O
Not used
55, 56
PB1, PB2
I
Initialize signal input for the destination select
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
SRF-M80
10
10
MAIN BOARD
(COMPONENT SIDE)
(11)
11
1-683-951-
BLK
RED
NATURAL
L1
AM
FERRITE-ROD
ANTENNA
C25
R17
C27
R18
C23
C21
C22
C26
R19
C31
C30
C32
R20
C33
R39
Q5
BC
E
EC
B
Q1
Q6
R26
C42
C64
R14
R10
C18
C9
C66
R2
D3
K
A
R7
C12
R13
A
K
D5
C10
R11
C16
C17
L5
C19
C20
R43
R42
R27
R15
R28
R29
R37
R41
R40
C47
C45
L7
L6
L8
C56
C57
R36
C48
R32
R30
C50
R33
R34
C54
C55
C1
C40
R4
R1
R21
R22
C37
C36
R23
R24
C38
C65
C2
C39
R25
C61
EC
B
Q4
R3
R5
C4
C60
C5
C3
A
K
A
D2
C68
IC2
IC3
IC1
R35
1
12
C28
+
C24
+
C29
+
C34
+
BPF1
+
C8
RV1
RV2
L3
FM RF
L2
AM OSC
CT1
+
C41
+
C51
+
C52
+
C53
+
C58
+
C46
+
C49
+
C15
+
C44
J1
MAIN BOARD
(CONDUCTOR SIDE)
(11)
11
1-683-951-
S1
DX t LOCAL
FM SENS
A
KEY BOARD
DRY BATTERY
SIXE “AAA”
(ICE DESIGNATION RO3)
2PCS. 3V
-1
-2
i
VOL
RV3
1
5
10
6
9
8
16
1
TP
(AM GND)
TP
(FM ST)
TP
(VT)
TP
(FM GND)
TP
(FM IN)
3
1
21
20
11
10
1
40
31
30
2E
2B
1C
2B
1C
2C
1B
1E
1B
1E
TP
(B+)
A
B
C
D
E
1
2
3
4
5
6
7
8
9
R38
4-4.
PRINTED WIRING BOARD – MAIN Board –
• Semiconductor
Location
Ref. No.
Location
D2
E-8
D3
D-8
D5
D-8
IC1
C-8
IC2
D-7
IC3
B-6
Q1
C-7
Q4
E-7
Q5
D-6
Q6
B-7
(Page 11)
SRF-M80
11
11
C
A
B
C
D
E
F
1
2
3
4
5
6
7
8
9
4-5.
PRINTED WIRING BOARD – KEY Board –
• Semiconductor
Location
Ref. No.
Location
D101
D-4
D102
E-6
D103
E-6
D104
D-4
D105
D-6
IC101
D-7
IC102
D-2
IC103
D-3
Q101
D-4
Q102
D-3
Q103
C-3
Q104
E-6
(Page 10)
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