Diagrams; Block Diagram; Ic Pin Function Description - Sony ICF-C793 Service Manual

SECTION 5

DIAGRAMS

5-1.

BLOCK DIAGRAM

L3, TC3
FM TRACKING
L3
FM RF
D2 TC3
ANT1
FM LEAD
ANTENNA
9
FM RF
IN
B.P.F. FM
12
BPF1 FRONT-END
(C793L)
L1 (C793)
AM (MW/LW)
L1, TC1 L1-1, TC1
FERRITE-ROD
AM TRACKING MW TRACKING
ANTENNA
AM RF
IN AM
10
L1-1 FRONT-END
(MW)
(C793)
D4-1
TC1
D1-1
(C793L)
Q1
5
L1-2 MW/LW
(LW) SWITCH L5
AM (MW) VCO VOLTAGE
D1-2
L5
AM (MW/LW)
TC2
OSC
L1-2, TC2
LW TRACKING
TC4
(C793L)
TC4
LW VCO
VOLTAGE
Q3
MW/LW
SWITCH
(C793L)
LOW-PASS FILTER
Q50, 51
15
1 XOUT
X50
FM/AM PLL
75kHz
IC50
2 XIN
5 4 3
27 26 34
S0 – S23
22 23 19 20 60 – 37
X100
X101
4.19MHz 32.768kHz
LIQUID CRYSTAL DISPLAY
LCD100
05
– 9 –
CF3
10.7MHz
FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
IC1
2
FM FM
RF DISCRI
FM/AM CF2 FM
FE OUT 10.7MHz IF IN
+ FM 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
(C793)
D4-2
D3
D1-3
(C793L)
(C793L)
D74 D75 S50
A RADIO B BUZZER BRIGHTNESS
Q52
(LCD BACK LIGHT)
MW/LW
D60, 61
SWITCH
CONTROL
11 12 8 7
D74 D75
B+
LED DRIVE
Q53, 54
D70 – 73
(LCD BACK LIGHT)
6 7
SYSTEM CONTROLLER,
LCD DRIVER, KEY CONTROL
IC100
COM0 – COM3 KS0 – KS4 KR0 – KR3
61 – 64 1 2 3 4 10 – 13, 8 14 – 17
(SUFFIX–12)
LCD REFERENCE
VOLTAGE GENERATOR
IC102
(SUFFIX–11)
S101, 201 – 218
(KEY MATRIX)
• SIGNAL PATH
: FM
: AM (MW/LW)
DET AF AF
OUT IN OUT
+ AF
23 24 27
SP301
POWER AMP
(SPEAKER)
(C793L)
Q5
TONE
CONTROL
SWITCH
3 4
VR1
VOL
MUTING
Q4
B+
–2
HIGH
LOW
–1
D102
35 36 33
18 28
RESET SIGNAL
GENERATOR
IC101 D101
T301
D100
POWER
BACKUP B+
TRANSFORMER
(SYSTEM CONTROLLER IC100 B+)
REGULATOR RECT
B+
Q57 D351 – 354
RECT
VT B+
D355
– 10 –
5-2.

IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC100 µPD753106GC-053-AB8 (SYSTEM CONTROLLER, LCD DRIVER, KEY CONTROL)
Pin No. Pin Name I/O
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
5 NC O Not used (open)
LED drive signal output of the LCD back light LED (D74)
6 ALM A O
"H" output at alarm A setting (LED on)
LED drive signal output of the LCD back light LED (D75)
7 ALM B O
"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)
System reset signal input from the reset signal generator (IC101) "L": reset
18 RESET I
"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
PI0 (pin @ª)
"H" "H"
PI1 (pin #º) "H" "L"
PI2 (pin #¡)
"H" "H"
AC IN
ICF-C793/C793L
Description
ICF-C793L
French UK
"H" "H" "L"
"H" "L" "H"
"L" "L" "H"
– 11 –