– 34 –
7-8.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC302 CXP84124-078Q (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Function
1
LIM.SW
I
Sled limit in detect switch (SW1) input terminal
“L”: When the optical pick-up is inner position
2
BUSON
I
Bus on/off control signal input from the SONY bus interface (IC204) “H”: bus on
3
EJECT
I
Eject switch (SW303) input terminal “H” active
4
LOAD1
I
Save end detect switch (SW12) input terminal
“L”: When completion of the disc chucking operation
5
LOAD2
I
Chucking end detect switch (SW11) input terminal
“L”: When completion of the disc chucking operation
6
A.MUTE
O
Audio line muting on/off control signal output terminal “H”: muting on
7
EMPH
O
Emphasis mode output to the D/A converter (IC401) “L”: emphasis on
8
CH.R
O
Motor drive signal (save direction) output to the chucking motor drive (IC52)
“H” active *1
9
CH.F
O
Motor drive signal (load chucking direction) output to the chucking motor drive (IC52)
“H” active *1
10
—
O
Not used (open)
11
ELV.R
O
Motor drive signal (elevator down direction) output to the elevator motor drive (IC301)
“L” active *2
12
ELV.ON
O
Mechanism deck section power supply on/off control signal output “H”: power on
13
CD RST
O
System reset signal output to the CXA1992AR (IC11), CXD2530Q (IC101) and SM5852FS
(IC102) “L”: reset
14
CDON
O
D/A converter and servo section power supply on/off control signal output “H”: power on
15 to 23
—
O
Not used (open)
24
AUTO ON/OFF
I
Setting terminal for the automatic adjustment “L”: automatic adjustment, “H”: manual
adjustement (solder across the BP302 terminal) Normally: fixed at “L”
25 to 29
—
O
Not used (open)
30
RESET
I
System reset signal input from the reset signal generator (IC202) and SONY bus interface
(IC204) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
31
EXTAL
I
Main system clock input terminal (8 MHz)
32
XTAL
O
Main system clock output terminal (8 MHz)
33
VSS
—
Ground terminal
34
TX
O
Sub system clock output terminal Not used (open)
35
TEX
I
Sub system clock input terminal Not used (fixed at “L”)
36
AVSS
—
Ground terminal (for A/D converter)
37
AVREF
I
Reference voltage (+5V) input terminal (for A/D converter)
38
ATRIBT
I
Selection input of the custom file, D-BASS, etc.
39
MCK
I
Input of signal for the fine adjustment (linear position sensor adjustment; RV301) of elevator
position (A/D input)
40
EHS
I
Elevator height position detect input from the RV302 (elevator height sensor) (A/D input)
41
H.TEMP
I
High temperature sensor input terminal Not used (open)
42
—
O
Not used (open)
43
MODE1
O
D-BASS control signal output to the SM5852FS (IC102)
44
MODE2
O
D-BASS control signal output to the SM5852FS (IC102)
45
MODE3
O
D-BASS control signal output Not used (open)
46, 47
—
O
Not used (open)
48
SCK
I
Serial data transfer clock signal input from the SONY bus interface (IC204)
49
SI
I
Serial data input from the SONY bus interface (IC204)
