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25

26

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Pin No.

Pin Name

I/O

Description

1

VREF–

I

Reference voltage (0V) input terminal (for A/D converter)

2

VSM

I

FM and AM signal meter voltage detection signal input from the FM/AM tuner unit (TU1)
(A/D input)

3

NIL

I

Not used (fixed at “L”)

4

KEYIN1

I

Key input terminal (A/D input) LSW902, LSW905 to LSW911, S902 to S905
(MENU, SOUND, ENTER, S SCROLL, PTY D DISPLAY, LIST, AF, TA, > M SEEK+,
. m SEEK–, DISC/PRESET+, DISC/PRESET– keys input)

5

KEYIN0

I

Key input terminal (A/D input) LSW901, LSW903, LSW904, LSW914 to LSW919, S906, S907 
(OFF, SOURCE, MODE o, SHUF 6, 5, 4, 3 REP, 2, 1 keys input)

6

RCIN0

I

Rotary remote commander key input terminal (A/D input)

7

QUALITY

I

Noise level detection signal input at SEEK mode (A/D input)

8

MPTH

I

Multi-path detection signal input from the RDS decoder (IC51) (A/D input)

9

DSTSEL

I

Destination setting terminal    
“L”: XR-CA600X, center voltage: XR-CA600, “H”: XR-CA600V

10

VREF+

I

Reference voltage (+5V) input terminal (for A/D converter)

11

VDD

—

Power supply terminal (+5V)

12

OSCOUT

O

Main system clock output terminal (18.432 MHz)

13

OSCIN

I

Main system clock input terminal (18.432 MHz)

14

VSS

—

Ground terminal

15

XI

I

Sub system clock input terminal (32.768 kHz)

16

XO

O

Sub system clock output terminal (32.768 kHz)

17

MMOD

I

Selection signal of memory mode input terminal    “L”: single chip mode (fixed at “L”)

18

LCDSO

O

Serial data output to the liquid crystal display driver (IC900)

19

LCDCE

O

Chip enable signal output to the liquid crystal display driver (IC900)    “H” active

20

LCDCKO

O

Serial data transfer clock signal output to the liquid crystal display driver (IC900)

21

NCO

O

Not used (open)

22

SIRCS_RESET

O

SIRCS reset signal output terminal    Not used (open)

23

LCUBE_SEL

I

Destination setting terminal    “H”: L-cube model    Fixed at “L” in this set

24

SYSRST

O

Reset signal output to the SONY bus interface (IC581)    “L”: reset

25

BUSON

O

Bus on/off control signal output to the SONY bus interface (IC581)    “L”: bus on

26

KEYACK

I

Input of acknowledge signal for the key entry    Acknowledge signal is input to accept function 
and eject keys in the power off status    On at input of “H”

27

DAVN

I

Synchronized detection signal of RDS data block input from the RDS decoder (IC51)
“H” active

28

BUIN

I

Battery detection signal input from the SONY bus interface (IC581)  
“L” is input at low voltage

29

SIRCS

I

SIRCS remote control signal input from the remote control receiver (IC971)

30, 31

NIL

I

Not used (fixed at “L”)

32

NIH

I

Not used (fixed at “H”)

33

RESET

I

System reset signal input from the reset signal generator (IC551) and reset switch (S551)
“L”: reset    “L” is input for several 100 msec after power on, then it changes to “H”

34

TUNON

O

Tuner system power supply on/off control signal output    “H”: tuner power on

35

BEEP

O

Beep sound drive signal output to the power amplifier (IC751)

36

PW_ON

O

Main system power supply on/off control signal output    “H”: power on

37

NCO

I

Not used (open)

38

ACCIN

I

Accessory detection signal input    “L”: accessory on

39

NCO

O

Not used (open)

27

Pin No.

Pin Name

I/O

Description

40

TELATT

I

Telephone attenuate signal input    At input of “H”, the signal is attenuated by –20 dB

41

NIH

I

Not used (fixed at “H”)

42

BUSSO

O

Serial data output to the SONY bus interface (IC581)

43

BUSSI

I

Serial data input from the SONY bus interface (IC581)

44

BUSCKO

O

Serial data transfer clock signal output to the SONY bus interface (IC581)

45

IIC SIO

I/O

Two-way data IIC bus with the FM/AM tuner unit (TU1), RDS decoder (IC51) and electrical 
volume (IC331) 

46

NCO

O

Not used (open)

47

IIC CKO

O

IIC bus clock signal output to the FM/AM tuner unit (TU1), RDS decoder (IC51) and electrical 
volume (IC331) 

48

AMPON

O

Standby on/off control signal output to the power amplifier (IC751)
“L”: standby mode, “H”: amplifier on

49

AMPATT

O

Muting on/off control signal output to the power amplifier (IC751)    “L”: muting on

50

ATT

O

Audio line muting on/off control signal output    “H”: muting on

51

NCO

O

Not used (open)

52

AMSON

O

Tape auto music sensor control signal output to the CXA2509AQ (IC301)
“L”: auto music sensor on

53

F/ROUT

O

Forward/reverse control signal output to the CXA2509AQ (IC301)
“L”: reverse direction, “H”: forward direction

54

MTLON

O

METAL control in/out terminal
At initial mode: valid/invalid selection input of METAL function (valid at “L” input)
At normal mode: METAL on/off control signal output to the CXA2509AQ (IC301) 
(METAL on at “H” output)

55

TAPATT

O

Tape muting on/off control signal output to the CXA2509AQ (IC301)    “H”: muting on
Active at ATA, FF/REW mode

56

NCO

I/O

Dolby control in/out terminal    Not used (pull down)

57

AMSIN

I

Whether a music is present or not from CXA2509AQ (IC301) is detected at auto music sensor
“L”: music is present, “H”: music is not present

58

4VPRE

I

4V PREOUT setting terminal    “L”: 4V PREOUT on    Fixed at “H” in this set

59

VOLATT

O

Pre amplifier muting on/off control signal output to the electrical volume (IC331)
“L”: muting on

60 to 64

NCO

O

Not used (open)

65

FL_W

I

Internal flash memory data write mode detection signal input terminal    “L”: data write mode
Not used (open)

66

TESTIN

I

Setting terminal for the test mode    “L”: test mode, normally fixed at “H”

67

RCIN1

I

Rotary remote commander shift key input terminal    “L”: shift key on

68 to 73

NCO

O

Not used (open)

74

EEP SIO

I/O

Two-way data bus for tuner EEPROM with the FM/AM tuner unit (TU1)

75

EEP CKO

I/O

Two-way bus clock signal for tuner EEPROM with the FM/AM tuner unit (TU1)

76

COLSEL

I

Setting terminal for the illumination color
“L”: amber, “H”: green    Fixed at “L” in this set

77

NCO

O

Not used (open)

78

DOORSW

I

Front panel open/close detection signal input    “L” is input when the front panel is closed

79

DOORIND

O

LED drive signal output of the MD disc slot illumination and Z indicator (LED810, LSW810)
“H”: LED on    “H” is output to turn on the LED when front panel is opened

80, 81

RE IN1, RE IN0

I

Dial pulse input of the rotary encoder (RE901) (for VOLUME control)

82

AD ON

O

A/D converter power control signal output terminal
When the KEYACK (pin wh) that controls reference voltage power for key A/D conversion input 
is active, “L” is output from this terminal to enable the input

28

*1  Loading motor control

STOP

LOADING/

FORWARD

EJECT/

REVERSE

BRAKE

LMLOD (pin il )

“L”

“H”

“L”

“H”

LMEJ (pin o; )

“L”

“L”

“H”

“H”

Terminal

Mode

Pin No.

Pin Name

I/O

Description

83

ILLON

O

Power on/off control signal output of the illumination LED and liquid crystal display driver 
(IC900)    “H”: power on

84

REL

I

Rotation detection signal input from supply reel sensor and take-up reel sensor on the mechanism 
deck

85

POS3

I

86

POS2

I

87

POS0

I

88

POS1

I

89

LMLOD

O

Motor drive signal output to the loading motor drive (IC351)    “H” active
(For the loading direction and forward side operation)    *1

90

LMEJ

O

Motor drive signal output to the loading motor drive (IC351)    “H” active
(For the eject direction and reverse side operation)    *1

91

TAPEON

O

Power on/off control signal output of the loading motor drive (IC351) and capstan/reel motor 
(M901)    “H”: motor on

92

CMON

O

Capstan/reel motor (M901) drive signal output terminal    “H”: motor on

93

NOSESW

I

Front panel block remove/attach detection signal input from the nose detection switch (S552)
“L”: front panel is attached, “H”: front panel is removed

94

NS_MASK

O

Discharge control signal output for the noise detection circuit   “H”: discharge

95

DAVSS

—

Ground terminal (for D/A converter)

96 to 99

NCO

O

Not used (open)

100

DAVCC

—

Power supply terminal (+5V) (for D/A converter)

Tape position (EJECT/FF/REW/REV/
FWD mode) detect input from the tape 
operation switch on the deck mechanism

POS3: “L”: REV and EJECT mode, “H”: others mode
POS2: “L”: REW mode, “H”: others mode
POS0: “L”: EJECT mode, “H”: others mode
POS1: “L”: PLAY and FF in FWD mode, and REW 

in REV mode, “H”: others mode