Pin
No.
Mark
I/O
Division
Function
23
CHK
MODE
I
Not used (Connected to power supply
through registor)
24
CLK
CNT
O
Clock control signal output terminal (Not
used, open)
25
CLK
SPD
O
Communication clock velocity select
input terminal
26
CS
O
Communication request receiving signal
terminal to FL drive/ system control IC
27
REQ
I
Communication request signal terminal
to FL drive/ system control IC
28
DTI
I
Data input terminal from FL drive/
system control IC
29
DTO
O
Data output terminal to FL drive/ system
control IC
30
NC
—
Not used, open
31
CLK
O
Clock terminal to FL drive/ system
control IC
32
DISPLE
D
O
LED drive signal output terminal
33
CLOSE
O
Loading
motor
"CLOSE"
command
signal output terminal
34
OPEN
O
Loading motor "OPEN" command signal
output terminal
35
CLOSE
SW
I
Disc tray "CLOSE" det. switch signal
input terminal
36
OPEN
SW
I
Disc tray "OPEN" det. switch signal
input terminal
37
REST
SW
I
Rest position det. signal input terminal
38
STAT
I
Status signal terminal
39
V
DD
I
Power supply terminal
40
CDUNIT
I
Connected to power supply through
registor
41
MODEL
I
42
NC
—
Not used, open
43
NC
—
44
KEY0
I
Key switch 0 det. input terminal
45
KEY1
I
Key switch 1 det. input terminal
46
KEY2
I
Key switch 2 det. input terminal
47
SPEED
O
PLL filter of CD unit select output
terminal
48
STR0
O
Key switch 0 det.output terminal
29
SL-
SL-
SL-
SL-HD50
HD50
HD50
HD505
5
5
5
