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• IC901 LC72358N-9B50 (SYSTEM CONTROL) (MAIN BOARD)
Pin No.
Pin Name
1
XIN
2
TEST2
3
CD DATA IN
4
NC
5
NC
6
E-VOL DO
7
LCD DI
8
LCD DO
9
LCD CLO
10
LCD CE
11
SQ OUT
12
COIN
13
CQCK
14
SD/ST
15
LOC/DX
16
IF REQ
17
NC
18
TU ON
19
NC
20
E-VOL CE
21
ACC CONT
22, 23
KS4, KS3
24 – 26
KS2 – KS0
27, 28
K3, K2
29
K1
30
K0
31
VDD
32
E-VOL CLO
33
LM SW
34
NC
35
FEM+ LM+
36
FEM– LM–
37
RW
38
LP UP
39
CD ON
40
A-MUTE
41
POWER CONT
42
ST-BY MUTE
43
POWER MUTE
44
BEEP
45
DFP IN
46
DRF
47
WRQ
48
RWC
49
CD RES
50
OPEN
51
SW2
52
SW1
53
R-ENCOD2
54
R-ENCOD1
I/O
I
System clock oscillator input (4.5 MHz)
—
Not used. (Open)
—
Not used. (Open)
—
Not used. (Open)
—
Not used.
O
Date output for volume level control
I
LCD driver date signal input
O
LCD driver date signal output
O
LCD driver clock signal output
O
LCD driver CE signal output
I
Sub-code Q input terminal
O
Command output terminal for DSP
Transfer-out clock for command output or output terminal for sub-code transfer
O
clock from SQ OUT
Stereo signal input when receiving "H"=MONO, "L"=ST FM reception.
I
Channel detection signal input when FM/AM seeking "H"=detect channel.
O
LOC/DX switching output when in the radio seek mode "H"=LOC, "L"=DX.
O
IF count signal request output
—
FM/AM power switch output "H"=AM, "L"=FM Not used. (Open)
O
Radio power switch output "H"=Radio mode Not used. (Open)
—
Not used. (Open)
O
CE output for volume level control
—
Not used. (Open)
O
Initial setting diode matrix output Not used. (Open)
O
Initial setting diode matrix output
I
Initial setting diode matrix input
I
Initial setting diode matrix input CD test mode, pulled down when not used.
I
Initial setting diode matrix input
—
Power supply pin
O
Clock output for volume level control
O
Loading or SLED GAIN switch output
—
Not used. (Open)
O
Sled motor control terminal
O
Sled motor control terminal
O
RW disc control output Normal set to "H".
O
RW disc control output Normal set to "L".
O
CD power switch output
O
Audio mute signal output
O
Power control signal output
O
ST-BY mute signal output
O
Power mute signal output
O
BEEP output (3 kHz, 50 ms)
I
Front panel detection signal input
I
"Detect RF" RF level detection input Pulled up when not used.
I
Sub-code Q output standby input terminal
O
Read/write control output terminal
O
DSP reset output terminal
—
Not used. (Open)
I
12 cm disc detection/12 cm disc ejection and detection
I
Leading motor start detection
I
Rotary encoder input 2
I
Rotary encoder input 1
CDC-X237/X437
Pin Description
15
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