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– 31 –

1

IC21 

1

 (XT OUT)

2

IC501 

!∞

 (XT IN)

3

IC501 

!£

 (OSC IN)

0.2 Vp-p

97.6 ns

1.7 Vp-p

30.5 

µ

s

1.3 Vp-p

54.2 ns

2.7 Vp-p

27 

µ

s

1

IC901 

^º

 OSC

– 32 –

•

Pin No.

Pin Name

I/O

Description

1

AVREF–

I

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

2

VSM

I

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

3

KEYIN1

I

Key input terminal (A/D input)
(LSW921 to LSW923, LSW925, LSW926, LSW928 to LSW933)
6, PRESET DISC –/+, DSPL, LIST, 6, 5 ENTER, 4 n, 3 PLAY MODE, 2 SET UP, 1 N
keys input

4

KEYIN0

I

Key input terminal (A/D input) (LSW901 to LSW903, S901, LSW905, LSW906)
OFF, SOURCE, MODE  

*, SEEK/AMS = 0 –  + ) +, SOUND, SHIFT keys

input

5

D-BASS IN

I

D-BASS switch (S981) input terminal (A/D input)

6

DSTSEL

I

Destination setting terminal (fixed at “L” in this set)

7

FUNC-SEL

I

Setting terminal for the function select (fixed at “L” in this set)

8

NCO

O

Not used (open)

9

RC-IN0

I

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

10

AVREF+

I

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

11

VDD

—

Power supply terminal (+5V)

12

OSC OUT

O

Main system clock output terminal (18.432 MHz)

13

OSC IN

I

Main system clock input terminal (18.432 MHz)

14

GND

—

Ground terminal

15

XT IN

I

Sub system clock input terminal (32.768 kHz)

16

XT OUT

O

Sub system clock output terminal (32.768 kHz)

17

GND

—

Ground terminal

18

RC-IN1

I

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

19

SYSRST

O

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

20

BUS-ON

O

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

21

UNISO

O

Serial data output to the SONY bus interface (IC581)

22

UNISI

I

Serial data input from the SONY bus interface (IC581)

23

UNICKO

O

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

24

UNICKI

I

Serial data reading clock signal input for the SONY bus interface

25

NCO

O

Not used (open)

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

NOSESW

I

Front panel block remove/attach detection signal input terminal
“L”: front panel is attached

28

BU-IN

I

Battery detect signal input from the SONY bus interface (IC581) and battery detect circuit
“L” is input at low voltage

29

SIRCS

I

Sircs remote control signal input from the remote control receiver (IC951)

30

TEL-ATT

I

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

31

TEST-IN

I

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

32

RAMBU

I

Internal RAM reset detection signal input from the XC61BN3312MR (IC552)
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset

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

VOL-MUT

O

Muting control signal output to the electrical volume (IC331)
Volume minimum: “

∞

” output (“H” active)

35

BEEP

O

Beep sound drive signal output terminal

– 33 –

Pin No.

Pin Name

I/O

Description

36

AMP-MUT

O

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

37

AMP ON

O

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

38

PLL-CKO

O

PLL serial data transfer clock signal output to the FM/AM PLL (IC21)

39

PLL-CE

O

PLL chip enable signal output to the FM/AM PLL (IC21)    “H” active

40

PLL-SO

O

PLL serial data output to the FM/AM PLL (IC21)

41

PLL-SI

I

PLL serial data input from the FM/AM PLL (IC21)

42

LCD-SO

O

Serial data output to the liquid crystal display driver (IC901)

43

LCD-CE

O

Chip enable signal output to the liquid crystal display driver (IC901)    “H” active

44

LCD-CKO

O

Serial data transfer clock signal output to the liquid crystal display driver (IC901)

45

VOL-SIO

I/O

Two-way data bus with the electrical volume (IC331)

46

NCO

O

Not used (open)

47

VOL-CKO

O

Bus clock signal output to the electrical volume (IC331)

48

ACC-IN

I

Accessory detect signal input terminal    “L”: accessory on

49

MUT

O

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

50

NCO

O

Not used (open)

51

AMSON

O

Tape auto music sensor control signal output to the CXA2510AQ (IC301)
“L” is output to lower the gain for audio level at FF/REW mode

52

N/R-OUT

O

Forward/reverse direction control signal output to the CXA2510AQ (IC301)
“L”: forward direction, “H”: reverse direction

53

MTLON

I/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 CXA2510AQ (IC301)
(METAL on at “H” output)

54

TAPE-MUT

O

Tape muting on/off control signal output to the CXA2510AQ (IC301)    “H”: muting on
Active at ATA, FF/REW mode

55

DOLON

I/O

Dolby control in/out terminal
At initial mode: valid/invalid selection input of dolby function (valid at “L” input)
At normal mode: dolby on/off control signal output to the CXA2510AQ (IC301)
(dolby on at “H” output)

56

AMSIN

I

Whether a music is present or not from CXA2510AQ (IC301) is detected at auto music sensor
“L”: music is present, “H”: music is not present

57 to 75

NCO

O

Not used (open)

76

ST-MONO

I/O

FM stereo broadcasting detection signal input from the FM/AM tuner unit (TU1), or forced
monaural control signal output to the FM/AM tuner unit (TU1)
“L” is input in the FM stereo mode, or “L” is output in the forced monaural mode

77

SD-IN

I

Station detector detect input from the FM/AM tuner unit (TU1)
Stop level for SEEK, BTM, etc. is determined    SD is present at input of “H”

78

RE-IN0

I

79

RE-IN1

I

80

AD-ON

O

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

81

POWSEL

I

Power select switch (S501) input terminal    “L”: off (halt mode), “H”: on (operation mode)

82

ILL-ON

O

83

REEL

I

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

Power on/off control signal output of the illumination LED and liquid crystal display driver
(IC901)    “H”: power on    Depends on initial setting of power select switch (S501)
Power select switch (S501) on: “H” output at the accessory on
Power select switch (S501) off: “H” output at the power on

Dial pulse input of the rotary encoder (RE900)
 (for VOLUME/BASS/TREBLE/BALANCE/FADER control)

– 34 –

Pin No.

Pin Name

I/O

Description

84

POS3

I

85

POS2

I

86

POS0

I

87

POS1

I

88

LM-LOD

O

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

89

LM-EJ

O

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

90

TAPEON

O

Tape system power supply on/off control signal output terminal    “H”: tape on

91

CM-ON

O

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

92

POWON

O

Main system power supply on/off control signal output to the BA3918 (IC611)    “H”: power on

93

FM-ON

O

FM system power supply on/off control signal output to the BA3918 (IC611)
“L”: AM power on, “H”: FM power on

94

TU-ON

O

Tuner system power supply on/off control signal output to the BA3918 (IC611)
“H”: tuner power on

95 to 100

NCO

O

Not used (open)

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”: FF and FWD mode, “H”: others mode

*1  Loading/tape operation motor control

STOP

LOADING/

FORWARD

EJECT/

REVERSE

BRAKE

LM-LOD (pin *•)

“L”

“H”

“L”

“H”

LM-EJ (pin *ª)

“L”

“L”

“H”

“H”

Mode

Terminal