PORT
SW 1
SW 2
SW 3
SW 4
SW 5
SW 6
SW 7
SW 8
SW 9
SW 10
Pin 19
Power
Input
Clock
Timer
Timer
Display
EQ Off
Rock
Jazz
Pop
(K1)
Set
Mode
Set
Pin 20
Tuning
Tuning
Band
Auto/
Auto
Manual
EX Bass
–
–
–
(K2)
Up
Down
Mono
Preset
Preset
Pin 21
CD
AMS -
–
–
Disc
Disc 1
Disc 2
Disc 3
Open
–
(K3)
AMS +
Skip
Close
Pin 22
CD
CD Play
FF
–
–
–
–
–
–
–
(K4)
Stop
Pause
RXD-251/301/351/371S/A3
8
CIRCUIT DESCRIPTION
No.
Name
I/O
Description
Active
H
L
90
VDD3
–
Vdd
91
POWER - SW
O
Power SW out
On
Off
92
SYS - MUT
O
System mute out
Off
On
93
TU - MUT
O
Tuner mute out
On
Off
94
MODE - SW - IN
I
No used
95
FUNCTION - TAPE
O
Function tape out
Tape
Others
96
LCD - BACK - LIGHT
O
LCD back light control
On
Off
97
N/C
–
No used
98
EX - BASS
O
EX - bass control
On
Off
99
LATCH
–
No used
100
STB
O
74HC4094 strobe
PIN
NAME
I/O
DESCRIPTION
ACTIVE
4
MUTE
O
CXD2508Q Muting (DAC)
H : ON
L : OFF
5
CONTROL
O
CXA1782BQ, CXD2508Q Vdd control
H : Others
L : CD
6
XRST
O
CXD2508Q XRST
7
T • T +
O
T • T/U • D Motor (+)
11
CONTROL
O
T • T Motor speed Control
12
TRAY -
O
Tray Motor Control (-)
13
TRAY +
O
Tray Motor Control (+)
14
T • T -
O
T • T/U • D Motor (-)
4. All LCD light on mode
• The all LCD light up when the STOP key and TIMER SET key are pressed simultaneously, while the power is ON.
• When the ON/STANDBY key is pressed, the all LCD light on mode is canceled.
2. Key matrix
3. I/O port extension (CD mecha. unit)
IC02 (74HC4094)
