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SECTION 4
DIAGRAMS
4-1.
BLOCK DIAGRAM
L3, TC3
FM TRACKING
L3
FM RF
ANT1
D2
TC3
FM/AM IF AMP, DET, AGC, AF AMP
FM LEAD
ANTENNA
9
FM
RF
FM RF
IN
FM
B.P.F.
12
FRONT-END
BPF1
L1
L1, TC1
AM FERRITE-ROD
ANTENNA
AM TRACKING
AM RF
IN
AM
10
FRONT-END
D4-1
TC1
5
L5
AM VCO VOLTAGE
L5
AM OSC
D4-2
LOW-PASS FILTER
Q50, 51
15
1
XOUT
X50
FM/AM PLL
75kHz
IC50
2
XIN
5
6
TIME CODE RECEIVER
IC451
L451
FERRITE-ROD
RF
REC
ANTENNA
7
IN
AGC
RECTIFIER &
DEC
TCO
2
9
DECODER
16
INT
AMPLIFIER
INTEGRATOR
8
13
14
10
11
L451
ANTENNA
X451
77.5kHz
25
S0 – S23
60 – 37
22
23
19
20
X101
X100
4.19MHz
32.768kHz
LIQUID CRYSTAL DISPLAY
05
– 9 –
CF3
10.7MHz
FM/AM FRONT-END,
IC1
2
FM
DISCRI
FM/AM
CF2
FM
DET
FE OUT
10.7MHz
IF IN
FM
OUT
+
FM
+
14
17
IF AMP
DISCRIMINATOR
T1
AM IF
CF1
AM
450kHz
IF IN
AM IF AMP,
16
AGC, DET
FM/AM
TUNING METER
BAND
SELECT
METER
7
15
19
L4
FM VCO VOLTAGE
L4
FM OSC
D3
11
12
8
D74
D75
A RADIO
B BUZZER
5
4
3
(LCD BACK LIGHT)
D74
D75
LED DRIVE
Q53, 54
(LCD BACK LIGHT)
27
26
34
6
7
SYSTEM CONTROLLER,
LCD DRIVER, KEY CONTROL
IC100
COM0 – COM3
KS0 – KS4
KR0 – KR3
61 – 64
10 – 13, 8
14 – 17
1
2 3 4
LCD REFERENCE
VOLTAGE GENERATOR
IC102
LCD100
(SYSTEM CONTROLLER IC100 B+)
S101, 201 – 218
(KEY MATRIX)
• SIGNAL PATH
: FM
: AM
AF
AF
IN
AF
OUT
23
24
27
SP301
POWER AMP
(SPEAKER)
3
4
VR1
VOL
MUTING
Q4
S50
BRIGHTNESS
D60, 61
B+
–2
HIGH
LOW
–1
D102
D70 – 73
35
36
33
18
28
RESET SIGNAL
GENERATOR
IC101
D101
T301
D100
POWER
BACKUP B+
TRANSFORMER
REGULATOR
RECT
B+
Q57
D351 – 354
RECT
VT B+
D355
– 10 –
• Circuit Boards Location
MAIN KEY board
ANTENNA board
ALARM KEY board
AC IN
ICF-C795RC
TRANSFORMER board
MAIN board
– 11 –
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