ICF-C793/C793L
– 9 –
– 10 –
– 11 –
SECTION 5
DIAGRAMS
5-1. 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
1
BIAS
2
VLC0
3
VLC1
4
VLC2
XT2
S0 – S23
12
P0
P1
78
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
LCD REFERENCE
VOLTAGE GENERATOR
IC102
L1-1, TC1
MW TRACKING
L1-2, TC2
LW TRACKING
TC2
Q5
TONE
CONTROL
SWITCH
D4-2
D1-3
(C793)
(C793L)
(C793L)
(C793L)
(SUFFIX–12)
(SUFFIX–11)
(C793L)
D102
D60, 61
HIGH
LOW
5-2. IC PIN FUNCTION DESCRIPTION
• MAIN BOARD IC100 µPD753106GC-053-AB8 (SYSTEM CONTROLLER, LCD DRIVER, KEY CONTROL)
Pin No. Pin Name I/O Description
1 BIAS O
Liquid crystal display drive bias control output terminal
2 to 4 VLC0 to VLC2 —
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
5NCO
Not used (open)
6 ALM A O
LED drive signal output of the LCD back light LED (D74)
“H” output at alarm A setting (LED on)
7 ALM B O
LED drive signal output of the LCD back light LED (D75)
“H” output at alarm B setting (LED on)
8 KS4 O
Key scan signal output of the key matrix (S101, S201 to S218)
9 VSS —
Ground terminal
10 to 13 KS0 to KS3 O
Key scan signal output of the key matrix (S101, S201 to S218)
14 to 17 KR0 to KR3 I
Key return signal input of the key matrix (S101, S201 to S218)
18 RESET I
System reset signal input from the reset signal generator (IC101) “L”: reset
“L” is input for several 100 msec after power on, then it changes to “H”
19 XT1 I
Sub system clock input terminal (32.768 kHz)
20 XT2 O
Sub system clock output terminal (32.768 kHz)
21 IC —
Connected to power supply (+3.8V)
22 X1 I
Main system clock input terminal (4.19 MHz)
23 X2 O
Main system clock output terminal (4.19 MHz)
24 VDD —
Power supply terminal (+3.8V)
25 NC I
Not used (open)
26 CLK O
PLL serial data transfer clock signal output to the FM/AM PLL (IC50)
27 DATA O
PLL serial data output to the FM/AM PLL (IC50)
28 PDET I
Power failure detection input terminal “L”: power failure
29 to 31 PI0 to PI2 I
Destination setting terminal *1
32 TEST I
Test mode input terminal “L”: test mode Not used (open)
33 MUTE O
Muting on/off control signal output terminal “L”: muting on
34 CE O
PLL serial chip enable signal output to the FM/AM PLL (IC50)
35 BZ-CTRL O
Buzzer control signal output terminal “H” output at alarm B active
36 BUZZER O
Beep sound (2 kHz) drive signal output to the CXA1019M (IC1)
37 to 60 S23 to S0 O
Segment drive signal output to the liquid crystal display (LCD100)
61 to 64 COM0 to COM3 O
Common drive signal output to the liquid crystal display (LCD100)
*1
ICF-C793
US, Canadian AEP, Singapore Australian French UK
PI0 (pin @ª)
“H” “H” “H” “H” “L”
PI1 (pin #º)
“H” “L” “H” “L” “H”
PI2 (pin #¡)
“H” “H” “L” “L” “H”
ICF-C793L
To Next Page
Loading...
