7-8. IC PIN FUNCTION DESCRIPTION
? MAIN BOARD IC302 CXP84124-078Q (SYSTEM CONTROLLER)
Pin No.Pin NameI/OFunction
Sled limit in detect switch (SW1) input terminal
1LIM.SWI
OL�: When the optical pick-up is inner position
2BUSONIBus on/off control signal input from the SONY bus interface (IC204) OH�: bus on
3EJECTIEject switch (SW303) input terminal OH� active
Save end detect switch (SW12) input terminal
4LOAD1I
OL�: When completion of the disc chucking operation
Chucking end detect switch (SW11) input terminal
5LOAD2I
OL�: When completion of the disc chucking operation
6A.MUTEOAudio line muting on/off control signal output terminal OH�: muting on
7EMPHOEmphasis mode output to the D/A converter (IC401) OL�: emphasis on
Motor drive signal (save direction) output to the chucking motor drive (IC52)
8CH.RO
OH� active *1
Motor drive signal (load chucking direction) output to the chucking motor drive (IC52)
9CH.FO
OH� active *1
10NONot used (open)
Motor drive signal (elevator down direction) output to the elevator motor drive (IC301)
11ELV.RO
OL� active *2
12ELV.ONOMechanism deck section power supply on/off control signal output OH�: power on
System reset signal output to the CXA1992AR (IC11), CXD2530Q (IC101) and SM5852FS
13CD RSTO
(IC102) OL�: reset
14CDONOD/A converter and servo section power supply on/off control signal output OH�: power on
15 to 23NONot used (open)
Setting terminal for the automatic adjustment OL�: automatic adjustment, OH�: manual
24AUTO ON/OFFI
adjustement (solder across the BP302 terminal) Normally: fixed at OL�
25 to 29NONot used (open)
System reset signal input from the reset signal generator (IC202) and SONY bus interface
30RESETI(IC204) OL�: reset
For several hundreds msec. after the power supply rises, OL� is input, then it changes to OH�
31EXTALIMain system clock input terminal (8 MHz)
32XTALOMain system clock output terminal (8 MHz)
33VSSNGround terminal
34TXOSub system clock output terminal Not used (open)
35TEXISub system clock input terminal Not used (fixed at OL�)
36AVSSNGround terminal (for A/D converter)
37AVREFIReference voltage (+5V) input terminal (for A/D converter)
38ATRIBTISelection input of the custom file, D-BASS, etc.
Input of signal for the fine adjustment (linear position sensor adjustment; RV301) of elevator
39MCKI
position (A/D input)
40EHSIElevator height position detect input from the RV302 (elevator height sensor) (A/D input)
41H.TEMPIHigh temperature sensor input terminal Not used (open)
42NONot used (open)
43MODE1OD-BASS control signal output to the SM5852FS (IC102)
44MODE2OD-BASS control signal output to the SM5852FS (IC102)
45MODE3OD-BASS control signal output Not used (open)
46, 47NONot used (open)
48SCKISerial data transfer clock signal input from the SONY bus interface (IC204)
49SIISerial data input from the SONY bus interface (IC204)
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ACEC
