Diagrams; Block Diagram - Sony ICF-M770L Service Manual

ICF-M770L/M770S/M770SL
SECTION 5

DIAGRAMS

5-1.

BLOCK DIAGRAM

ANT1
FM/SW
ANTENNA
B.P.F.
BPF1
M770S/
SW
M770SL
SWITCH
Q1
L3
SW
Q2
RF
SW
SWITCH
CT1, L3
LW TRACKING
VCC B+
(M770L)
L5-1
MW
FERRITE-ROD
ANTENNA
Q6
REG MW/LW
CT1
+1.2V SWITCH
L5-2
LW
FERRITE-ROD
ANTENNA
REG D2-1
+1.2V
CT2
L5
M770S/ MW/LW
M770SL FERRITE-ROD
ANTENNA
REG
+1.2V
SW BAND
(M770L) (M770L)
SELECT SWITCH
CT1, L5-1 CT2, L5-2 Q3
MW TRACKING LW TRACKING
M770S/
M770SL
(M770S) (M770SL)
CT2, L5 CT2, L5
MW TRACKING LW TRACKING
FM/(SW/MW/LW) BAND
SELECT SWITCH VCC B+
Q5
M770S/
M770SL
3 4
LCD0 – LCD12 COM0 – COM3
35 – 47
25 24 31 – 34
X101
75kHz
LIQUID CRYSTAL DISPLAY
LCD101
CT4, L12, 13
FM TRACKING
L12, 13
FM RF
CT4
D6
10
FM
RF
FM FM/AM
RF IN IF OUT
FM
+
13 15
FRONT-END
AM
RF IN
AM
11
FRONT-END
6 8
D1-1 (M770L)
L8
SW/MW
OSC
M770S/
M770SL
CT3
D1-2 FM VCO
CT3
LW VT
BUFFER
VOLTAGE
Q8
SW
MW/LW SWITCH
SWITCH Q4
Q4
(M770L) M770S/
M770SL
(M770L)
MW/LW
SWITCH
Q7
L10
MW/LW
OSC
M770S/
D2-2
M770SL
FM VCO
LOW-PASS FILTER
BUFFER
Q104, 110
Q105
19 20 21
SYSTEM CONTROLLER,
LIQUID CRYSTAL DISPLAY DRIVER,
KEY CONTROL
IC104
KS0 – KS4 KR0 – KR3
1, 6 – 9 10 – 13
KEY MATRIX
S101 – 119
FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
IC1
CF2 CF3
FM
10.7MHz 10.7MHz
IF IN
FM
18
IF AMP
CF4
FM
10.7MHz
DISCRI
FM
3
DISCRIMINATOR
T1
AM IFT
CF1 AM
450kHz IF IN
AM IF AMP,
17
AGC, DET
T1
AM IF
FM/AM
TUNING METER
BAND
SELECT METER
16 20
L14
FM VT VOLTAGE
FM/(SW/MW/LW) BAND
L14
SELECT SWITCH
FM OSC
Q10
(M770L) (M770S/M770SL)
D7
L8 L8
MW VT SW VT
VOLTAGE VOLTAGE
D9
FM/(SW/MW/LW) BAND
SELECT SWITCH
Q108
14
(M770S) (M770SL)
L10 L10
MW VT LW VT
VOLTAGE VOLTAGE
AC DET
56
VDET1
CEDET
VDET2
17 16
LED DRIVE
S120
+3V B+ Q107
HOLD
OFF
HOLD
POWER
D104, 105
(LCD BACK LIGHT)
8 8
DET AF
OUT
IN
+ AF
24 25
POWER AMP
RV2
TONE
Q11, 12
TONE
CONTROL
SWITCH
9 4 5
REG +1.2V
MUTING
SWITCH
BEEP 52
2
MUTE
AC DETECT AC DETECT
15
Q103 Q201
BATTERY
50 VOLTAGE DETECT
IC102
51
BATTERY
VOLTAGE DETECT
53
IC103
B+ SWITCH
VCC B+
Q101
+3V B+
LOW-PASS
DC/DC
B+ SWITCH
FILTER
CONVERTER
Q109
CIRCUIT Q106, 111, T101
D102
B+
POWER ON/OFF
5 CONTROL SWITCH
Q102
• SIGNAL PATH
: FM
: MW/LW
AF
OUT
28 J201
v
SP1
RV1
VOL
Q9
T202
POWER
TRANSFORMER
J301
RECT
D205, 206 AC IN -
D201
D202 – 204
DRY BATTERY
+3V
SIZE "D"
REGULATOR
(IEC DESIGNATION R20)
IC101
4PCS. 6V