Read Sony ICF-S79 / ICF-S79L / ICF-S79V Service Manual online
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Pin No.
Pin Name
I/O
Function
1
INIT OUT
O
Initialize signal output for the destination select
2
POWER
O
Radio power on/off control signal output “H”: power on
3
MUTE
O
Mute on/off control signal output “L”: mute on
4
AL LEVEL
O
Beep sound level variable output terminal Not used (open)
5
NC
O
Not used (open)
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 *1
15
BAND2
O
Band select signal output terminal *1
Used for ICF-S79L/S79V only (ICF-S79: not used (open))
Used for ICF-S79L/S79V only (ICF-S79: not used (open))
16
V AMP
—
Power supply terminal for buffer amplifier
17
NC
O
Not used (open)
18
GND
—
Ground terminal
19
EO
O
PLL error signal output terminal
20
VCOL
I
AM (MW) or LW VCO input terminal
21
VCOH
I
FM, TV or 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
—
28
CAP0
—
29
CAP1
—
30
VLCD2
—
31 to 34
COM0 to COM3
O
Common drive signal output to the liquid crystal display (LCD1)
35 to 48
LCD0 to LCD13
O
Segment drive signal output to the liquid crystal display (LCD1)
49
LCD14
O
Segment drive signal output terminal Not used (open)
50
CE
I
Power failure detection signal input from the IC5 Normally: “H”
51
INT
I
Not used (fixed at “L”)
52
BEEP
O
Beep sound drive signal output terminal
53
VDET
I
Power failure detection signal input from the IC4 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
ICF-S79/S79L: initialize mode at “H”, ICF-S79V: fixed at “L”
ICF-S79/S79L: initialize mode at “H”, ICF-S79V: fixed at “L”
56
PB3
I
Initialize signal input for the destination select
ICF-S79L: initialize mode at “H”, ICF-S79/S79V: fixed at “L”
ICF-S79L: initialize mode at “H”, ICF-S79/S79V: fixed at “L”
MAIN BOARD IC6
µ
PD17071GB-517-1A7
(SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY CONTROLLER, KEY CONTROL)
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive
voltage
voltage
*1 Band select signal
FM (TV L)
TV H/
WEATHER
AM (MW)
LW
BAND1 (pin !¢)
“L”
“L”
“H”
“H”
BAND2 (pin !∞)
“L”
“H”
“L”
“H”
4-4.
IC PIN FUNCTION DESCRIPTION
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