Sony CDX-424RF - Compact Disc Changer System, Service Manual

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7-8. IC PIN FUNCTION DESCRIPTION
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MAIN BOARD IC302 CXP84124-080Q (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 CXA1992BR (IC11) and CXD2530Q (IC101) “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 adjustment (fixed at “L” in this set)
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 to 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)
50 SO O Serial data output to the SONY bus interface (IC204)
51 SQCLK O Subcode Q data reading clock signal output to the CXD2530Q (IC101)
52 SUBQ I Subcode Q data input from the CXD2530Q (IC101)
53 — O Not used (open)
54 — I Not used (fixed at “H”)
55 MGLK I
Magazine eject operation completion detect switch (SW301) input terminal
“L”: eject completed