Read Sony ICF-C900HS Service Manual online
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MAIN BOARD IC2 LC587206A-1L77 (SYSTEM CONTROLLER, KEY CONTROL, LCD DRIVER)
Pin No.
Pin Name
I/O
Function
1
RES
I
Reset signal input terminal
2
INT
I
Initialize input terminal
3
SO1
I
RANDOM switch (SW2) input terminal “L”: off, “H”: on
4
SO2
I
Not used (fixed at “L”)
5
SO3
I
ALARM dial input terminal
6
SO4
I
ALARM dial input terminal
7
P1
I
8
P2
I
PROGRAM LIGHT CONTROL dial input terminal
9
P3
I
10
P4
I
Not used (fixed at “L”)
11
XTOUT
O
Sub system clock (for slow mode) output terminal (32.768 kHz)
12
XTIN
I
Sub system clock (for slow mode) input terminal (32.768 kHz)
13
VDD2
—
Power supply terminal for the liquid crystal display drive
14
VDD1
—
Power supply terminal for the liquid crystal display drive
15
VSS
—
Ground terminal
16
VDD
—
Power supply terminal (+4V)
17
CFIN
I
Main system clock (for fast mode) input terminal (2 MHz)
18
CFOUT
O
Main system clock (for fast mode) output terminal (2 MHz)
19
S1
I
Not used (fixed at “L”)
20
S2
I
Not used (fixed at “L”)
21
S3
I
AC detection signal input terminal
22
S4
I
Not used (fixed at “L”)
23
K1
I
24
K2
I
25
K3
I
26
K4
I
27
M1
I
28
M2
I
29
M3
I
30
M4
I
31
POWER
O
Tuner system power supply on/off control signal output “H”: tuner on
32
MUTE
O
Muting on/off control signal output “L”: muting on
33
DATA
O
Carrier signal output for the light control module
34
ALM
O
Alarm pulse signal output to the CXA1019S (IC1)
35
TST
I
Test terminal (connected to ground)
36
KS1
O
37
KS2
O
Key send signal output to the key matrix
38
KS3
O
39
SEG4
O
40
SEG5
O
41
SEG6
O
42
SEG7
O
Segment drive signal output terminal Not used (pull down)
43
SEG8
O
44
SEG9
O
45
SEG10
O
46
SEG11
O
Alarm drive control signal output terminal
47
SEG12
O
Segment drive signal output terminal Not used (pull down)
Key return signal input from the key matrix
ID code dial input terminal
4-4.
IC PIN FUNCTION DESCRIPTION
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