– 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)