Read Sony ICF-S79W Service Manual online
ICF-S79W
11
• IC Pin Function Description
MAIN BOARD IC6 μPD17072GB-579-1A7-A (SYSTEM CONTROLLER, LCD DRIVER, KEY CONTROL)
MAIN BOARD IC6 μPD17072GB-579-1A7-A (SYSTEM CONTROLLER, LCD DRIVER, KEY CONTROL)
Pin No.
Pin Name
I/O
Description
1
INIT OUT
O
Initialize signal output for the destination select
2
POWER
O
Radio power on/off control signal output terminal “H”: power on
3
MUTE
O
Muting on/off control signal output “L”: muting on
4
AL LEVEL
O
Beep sound level variable output terminal Not used
5
NC
O
Not used
6 to 9
KS0 to KS3
O
Key strobe signal output terminal
10 to 13
KR0 to KR3
I
Key return signal input terminal
14
BAND1
O
Band select signal output terminal “L”: FM, WEATHER bands, “H”: AM band
15
BAND2
O
Band select signal output terminal “L”: FM, AM bands, “H”: WEATHER band
16
V AMP
-
Power supply terminal for buffer amplifi er
17
NC
O
Not used
18
GND
-
Ground terminal
19
EO
O
PLL error signal output terminal
20
VCOL
I
AM input terminal
21
VCOH
I
FM, WEATHER VCO input terminal
22
VREG1
-
Power supply terminal (connected to the coupling capacitor)
23
VDD
-
Power supply terminal (+2.2 V)
24
XOUT
O
System clock output terminal (75 kHz)
25
XIN
I
System clock input terminal (75 kHz)
26
VREG2
-
Power supply terminal (connected to the coupling capacitor)
27
VLCD0
-
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive
voltage
voltage
28
CAP0
-
29
CAP1
-
30
VLCD2
-
31 to 34
COM0 to COM3
O
Common drive signal output to the liquid crystal display
35 to 48
LCD0 to LCD13
O
Segment drive signal output to the liquid crystal display
49
LCD14
O
Segment drive signal output terminal Not used
50
CE
I
Power failure detection signal input terminal Normally: “H”
51
INT
I
Not used
52
BEEP
O
Beep sound drive signal output terminal
53
VDET
I
Power failure detection signal input terminal Normally: “H”
54
PB1
I
Initialize signal input for the destination select Fixed at “L”
55
PB2
I
Initialize signal input for the destination select Fixed at “L”
56
PB3
I
Initialize signal input for the destination select Fixed at “L”
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