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