Sony CDX-505RF/EXCD-3RF Service Manual page 20

4-5. IC PIN FUNCTION DESCRIPTION
MAIN BOARD IC302 CXP84124-066Q (SYSTEM CONTROLLER)
Pin No. Pin Name I/O
1 LIM.SW I
2 BUSON I
3 EJECT I
4 LOAD 1 I
5 LOAD 2 I
6 A.MUTE O
7 EMPH O
8 CH.R O
9 CH.F O
10 — —
11 ELV.R O
12 ELV.ON O
13 CD RST O
14 CD ON O
15 GBON —
16 EEON —
17-23 — —
24 TEST1 I
25-29 — —
30 RESET I
31 EXTAL I
32 XTAL O
33 VSS —
34 TX —
35 TEX I
36 AVSS —
37 AVREF I
38 ATRIBT I
39 MCK I
40 EHS I
41 HTMP —
42 — —
43 MODE1 O
44 MODE2 O
45 MODE3 O
46, 47 — —
48 SCK O
49 SI I
50 SO O
SECTION 6
DIAGRAMS
Input of limit switch
Input of Bus on control signal from SONY bus interface (IC204)
Input of EJECT key (SW303)
Input of LOAD OUT switch
Input of LOAD IN switch
Output of audio output mute on/off control signal
Output of emphasis mode for disc playing
Output of control signal to
the chucking motor drive (IC52)
Not used
Output of control signal to elevator motor drive (IC301)
Output of mechanical deck power supply control signal
Servo system resetting
Output of servo power supply control signal
Not used
Not used
Not used
Automatic adjustment selection "L": Automatic adjustment "H": Manual adjustment (Solder across
the BP302 terminal)
Not used
Input of system reset signal
Input of system clock (8 MHz)
Output of system clock (8 MHz)
Ground pin
Not used
Connected to ground
Ground pin of A/D converter
Input of A/D converter reference voltage
Selection of custom file, D-BASS, etc.
Input of signal for fine adjustment of elevator position
Input of elevator position (RV302)
Not used
Not used
Output of D-BASS control signal Not used
Output of D-BASS control signal Not used
Output of D-BASS control signal Not used
Not used
Output of serial clock signal from SONY bus interface (IC204)
Input of serial data signal from SONY bus interface (IC204)
Output of serial data signal to SONY bus interface (IC204)
– 33 –
Function
"H": Eject on
"H": Mute on
"L": on
FWD REV
CH.R L H
CH.F H L
"H": on
"H": on
"L": Reset
"H": Bus on
Forward : Load chucking
Brake
Reverse : Save
H
H