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