Sony DREAM MACHINE ICF-C793, Service Manual

Page: 8 / 35

ICF-C793/C793L
– 9 – – 10 –
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAM
12
9
14 17
10
5 7
FM
FRONT-END
FM
IF AMP
AF
POWER AMP
AM IF AMP,
AGC, DET
AM
FRONT-END
16
19
FM RF
IN FM/AM
FE OUT
CF2
10.7MHz
CF1
450kHz
CF3
10.7MHz
FM
RF
FM
IF IN
2
FM
DISCRIMINATOR
TUNING METER
FM
DISCRI
27
AF
OUT
SP301
(SPEAKER)
AF
IN
23 24
DET
OUT
AM
IF IN
METER
NF VOL
15
1
2
3 4
FM/AM
BAND
SELECT
AM OSC
L5
AM (MW/LW)
OSC
L4
FM OSC
X50
75kHz
L1
AM (MW/LW)
FERRITE-ROD
ANTENNA
ANT1
FM LEAD
ANTENNA
FM OSC
AM RF
IN
L3
FM RF
FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
IC1
FM/AM PLL
IC50
SYSTEM CONTROLLER,
LCD DRIVER, KEY CONTROL
IC100
TC1
D4-1
D1-1
(C793) (C793L)
L1-1
(MW)
L1-2
(LW)
Q1
MW/LW
SWITCH
Q3
MW/LW
SWITCH
B+
B+
Q52
MW/LW
SWITCH
CONTROL
(C793)
(C793L)
(C793L)
TC4
TC3
VR1
VOL
+ +
L4
FM VCO VOLTAGE
D74
A RADIO
D75
B BUZZER
S50
BRIGHTNESS
(LCD BACK LIGHT)
D70 – 73
(LCD BACK LIGHT)
D74 D75
–2
–1
L5
AM (MW) VCO VOLTAGE
TC4
LW VCO
VOLTAGE
L1, TC1
AM TRACKING
L3, TC3
FM TRACKING
T1
AM IF
B.P.F.
BPF1
LOW-PASS FILTER
Q50, 51
LED DRIVE
Q53, 54
MUTING
Q4
• SIGNAL PATH
: FM
: AM (MW/LW)
05
D1-2
D2
D3
AC IN
BACKUP B+
(SYSTEM CONTROLLER IC100 B+)
B+
BZ-CTRL
35
ALM A
6
ALM B
7
BUZZER
36
DATA
DA
PD1
27
5
15
CLK
CK
26
4
CE
CE
34
3
MUTE
PDET
33
28
RESET
18
AM IN
11
FM IN
XOUT
XIN
22 23
X101
4.19MHz
X1 X2
19 20
X100
32.768kHz
XT1 XT2 S0 – S23
12
P0 P1
7 8
D100
D101
VT B+
RECT
D351 – 354
REGULATOR
Q57
T301
POWER
TRANSFORMER
RECT
D355
RESET SIGNAL
GENERATOR
IC101
COM0 – COM3
S101, 201 – 218
(KEY MATRIX)
60 – 37 61 – 64
KS0 – KS4
10 – 13, 8
KR0 – KR3
14 – 17
LIQUID CRYSTAL DISPLAY
LCD100
L1-1, TC1
MW TRACKING
L1-2, TC2
LW TRACKING
TC2
Q5
TONE
CONTROL
SWITCH
D4-2
D1-3
(C793)
(C793L)
(C793L)
(C793L)
(C793L)
D102
D60, 61
HIGH
LOW