Read Sony CDX-505RF / EXCD-3RF Service Manual online
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1
LIM.SW
I
Input of limit switch
2
BUSON
I
Input of Bus on control signal from SONY bus interface (IC204)
“H”: Bus on
3
EJECT
I
Input of EJECT key (SW303)
“H”: Eject on
4
LOAD 1
I
Input of LOAD OUT switch
5
LOAD 2
I
Input of LOAD IN switch
6
A.MUTE
O
Output of audio output mute on/off control signal
“H”: Mute on
7
EMPH
O
Output of emphasis mode for disc playing
“L”: on
8
CH.R
O
Output of control signal to
9
CH.F
O
the chucking motor drive (IC52)
10
—
—
Not used
11
ELV.R
O
Output of control signal to elevator motor drive (IC301)
12
ELV.ON
O
Output of mechanical deck power supply control signal
“H”: on
13
CD RST
O
Servo system resetting
14
CD ON
O
Output of servo power supply control signal
“H”: on
15
GBON
—
Not used
16
EEON
—
Not used
17-23
—
—
Not used
24
TEST1
I
Automatic adjustment selection
“L”: Automatic adjustment
“H”: Manual adjustment (Solder across
the BP302 terminal)
25-29
—
—
Not used
30
RESET
I
Input of system reset signal
“L”: Reset
31
EXTAL
I
Input of system clock (8 MHz)
32
XTAL
O
Output of system clock (8 MHz)
33
VSS
—
Ground pin
34
TX
—
Not used
35
TEX
I
Connected to ground
36
AVSS
—
Ground pin of A/D converter
37
AVREF
I
Input of A/D converter reference voltage
38
ATRIBT
I
Selection of custom file, D-BASS, etc.
39
MCK
I
Input of signal for fine adjustment of elevator position
40
EHS
I
Input of elevator position (RV302)
41
HTMP
—
Not used
42
—
—
Not used
43
MODE1
O
Output of D-BASS control signal
Not used
44
MODE2
O
Output of D-BASS control signal
Not used
45
MODE3
O
Output of D-BASS control signal
Not used
46, 47
—
—
Not used
48
SCK
O
Output of serial clock signal from SONY bus interface (IC204)
49
SI
I
Input of serial data signal from SONY bus interface (IC204)
50
SO
O
Output of serial data signal to SONY bus interface (IC204)
4-5.
IC PIN FUNCTION DESCRIPTION
MAIN BOARD IC302
CXP84124-066Q (SYSTEM CONTROLLER)
SECTION 6
DIAGRAMS
Pin No.
Pin Name
I/O
Function
FWD
REV
Brake
CH.R
L
H
H
CH.F
H
L
H
Forward : Load chucking
Reverse : Save
Reverse : Save
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