Block Diagram - Sony ICF-C793 Service Manual

4-1.

BLOCK DIAGRAM

L3, TC3
FM TRACKING
L3
FM RF
D2
ANT1
FM LEAD
ANTENNA
B.P.F.
BPF1
(C793) (C793L)
L1
AM (MW/LW)
L1, TC1 L1-1, TC1
FERRITE-ROD
AM TRACKING MW TRACKING
ANTENNA
L1-1
(MW)
(C793)
D4-1
TC1
D1-1
(C793L)
Q1
L1-2 MW/LW
(LW) SWITCH
D1-2
AM (MW/LW)
TC2
L1-2, TC2
LW TRACKING
(C793L)
(C793L)
LOW-PASS FILTER
Q50, 51
15
1 XOUT
X50
75kHz
XIN
2
22 23 19
X100
X101
4.19MHz 32.768kHz
05
SECTION 4
DIAGRAMS
TC3
9
FM
RF
FM RF FM/AM
10.7MHz
IN FE OUT
FM
+
12 14
FRONT-END
T1
AM IF
AM RF
IN AM
10
FRONT-END 450kHz
5 7
L5 L4
AM (MW) VCO VOLTAGE FM VCO VOLTAGE
L5
L4
FM OSC
OSC
(C793)
TC4
TC4
D4-2
LW VCO
D3
VOLTAGE
D1-3
Q3 (C793L)
MW/LW
SWITCH
(C793L)
11 12 8 7
FM/AM PLL
IC50
5 4 3
27 26 34
S0 – S23 COM0 – COM3 KS0 – KS4
60 – 37 61 – 64 10 – 13, 8
20
LIQUID CRYSTAL DISPLAY
LCD100
S101, 201 – 218
(KEY MATRIX)
– 9 –
FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
IC1
CF2 FM DET
IF IN OUT
FM
+
17 23
IF AMP
(C793L)
CF3
FM
10.7MHz
DISCRI
FM
2
DISCRIMINATOR
CF1
AM
IF IN
AM IF AMP,
16
AGC, DET
FM/AM TUNING METER
BAND
SELECT METER
15 19
D74 D75 S50
A RADIO BRIGHTNESS
B BUZZER
Q52
(LCD BACK LIGHT)
MW/LW
D60, 61
SWITCH
CONTROL
–2
D74 D75
B+
LED DRIVE
–1
Q53, 54
D70 – 73
(LCD BACK LIGHT)
6 7
SYSTEM CONTROLLER,
LCD DRIVER, KEY CONTROL
IC100
KR0 – KR3
14 – 17
18
RESET SIGNAL
GENERATOR
IC101
D101
D100
BACKUP B+
(SYSTEM CONTROLLER IC100 B+)
B+
VT B+
• SIGNAL PATH
: FM
: AM (MW/LW)
AF AF
IN OUT
AF
24 27
SP301
POWER AMP
(SPEAKER)
Q5
TONE
CONTROL
SWITCH
3 4
VR1
VOL
MUTING
Q4
B+
HIGH
LOW
D102
35 36 33
28
T301
POWER
TRANSFORMER
REGULATOR RECT
Q57 D351 – 354
AC IN
RECT
D355
– 10 –
ICF-C793/C793L