Read Sony SRF-M80 Service Manual 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
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