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25

Pin No.

Pin Name

I/O

Description

38

DVCC

—

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

39

DVSS

—

Ground terminal (for D/A converter)

40, 41

NCO

O

Not used (open)

42

AVCC

—

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

43

AVRH

I

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

44

AVRL

I

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

45

AVSS

—

Ground terminal (for A/D converter)

46

KEYIN0

I

Key input terminal (A/D input) (LSW901 to LSW903, S901, LSW905, LSW906)
OFF, SOURCE, MODE  o, SEEK/AMS . m –  > M +, SOUND, SHIFT keys
input

47

KEYIN1

I

Key input terminal (A/D input) (LSW921 to LSW923, LSW925 to LSW933)
Z, PRESET DISC –/+, AF/TA, PTY, DSPL, 6, 5, 4 

t, 3 PLAY MODE, 2 SET UP, 1 T

keys input

48

RC-IN0

I

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

49

DSTSEL

I

Destination setting terminal    Fixed at “L” in this set

50

NOISE DET

I

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

51

D-BASS

I

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

52

MTP

I

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

53

VSM

I

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

54

VCC

—

Power supply terminal (+5V)

55

RAMBU

I

Internal RAM reset detection signal input terminal
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset    Fixed at “H” in this set

56

POWSEL

I

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

57

NCO

O

Not used (open)

58

TESTIN

I

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

59

DOOR-IND

O

LED drive signal output of the door indicator    “H”: LED on
“H” is output to turn on LED when front panel is opened    Not used (open)

60

EVOL MUTE

O

Muting control signal output to the electrical volume (IC401)
Volume minimum: “

∞

” output (“H” active)

61

COLR SW

I

Setting terminal for the illumination color
“L”: 2 colors, “H”: 1 color (fixed at “H” in this set)

62

COLR SEL

I

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

63

VSS

—

Ground terminal

64

NCO

O

Not used (open)

65

MUTE

O

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

66, 67

NCO

O

Not used (open)

68

AMP MUTE

O

Muting on/off control signal output to the power amplifier (IC611)    “L”: muting on

69

FLASH-W

I

Internal flash memory data write mode detection signal input terminal    “L”: data write mode
Not used (fixed at “H” in this set)

70

I2C SIO

I/O

Two-way data bus with the RDS decoder (IC51) and electrical volume (IC401)

71

I2C CKO

O

Bus clock signal output to the RDS decoder (IC51) and electrical volume (IC401)

72

RC-IN1

I

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

73

X1A

O

Sub system clock output terminal (32.768 kHz)

74

X0A

I

Sub system clock input terminal (32.768 kHz)

75

DAVN

I

Data transmit completed detect signal input from the RDS decoder (IC51)    “H” active

76

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”

26

Pin No.

Pin Name

I/O

Description

77

BU-IN

I

Battery detect signal input from the SONY bus interface (IC701) and battery detect circuit
“L” is input at low voltage

78

ILL IN

I

Auto dimmer control illumination line detection signal input terminal
“L” is input at dimmer detection    Fixed at “L” in this set

79

TEL-ATT

I

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

80

NOSESW

I

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

81

ACC IN

I

Accessory detect signal input terminal    “L”: accessory on

82 to 85

NCO

O

Not used (open)

86

HSTX

I

Hardware standby input terminal    “L”: hardware standby mode    Reset signal input in this set

87

MD2

I

Setting terminal for the CPU operational mode (fixed at “L” in this set)

88

MD1

I

Setting terminal for the CPU operational mode (fixed at “H” in this set)

89

MD0

I

Setting terminal for the CPU operational mode (fixed at “H” in this set)

90

RESET

I

System reset signal input from the reset signal generator (IC652) and reset switch (S503)
“L”: reset    “L” is input for several 100 msec after power on, then it changes to “H”

91

VSS

—

Ground terminal

92

X0

I

Main system clock input terminal (3.68 MHz)

93

X1

O

Main system clock output terminal (3.68 MHz)

94

VCC

—

Power supply terminal (+5V)

95 to 99

NCO

O

Not used (open)

100

9K/10K

I

AM frequency step (9 kHz or 10 kHz) selection signal input terminal
“L”: 9 kHz, “H”: 10 kHz    Not used (open)

101

NCO

O

Not used (open)

102

MTLIN

I

Auto metal detection signal input terminal    “L”: auto metal    Fixed at “L” in this set

103

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

104

REEL

I

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

105

POS0

I

106

POS1

I

107

POS2

I

108

POS3

I

109

LM-EJ

O

Motor drive signal output to the loading/tape operation motor drive (IC361)    “H” active
(For the eject direction and reverse side operation)    *1

110

LM-LOD

O

Motor drive signal output to the loading/tape operation motor drive (IC361)    “H” active
(For the loading direction and forward side operation)    *1

111

CM-ON

O

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

112

TAPEON

O

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

113

N-ROUT

O

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

114

AMSON

O

Tape auto music sensor control signal output to the CXA2509AQ (IC301)
“L” is output to lower the gain for audio level at FF/REW mode

115

MTLON

I/O

116

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 terminal (dolby on at “H” output)
Not used this function (fixed at “H”)

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

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

METAL control in/out terminal
At initial mode: auto/manual mode selection input of METAL function (manual at “L” input)
At manual mode: METAL on/off control signal output terminal (METAL on at “H” output)
At auto mode: input at MTLIN (pin <z/x)

27

Pin No.

Pin Name

I/O

Description

117

TAPE MUTE

O

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

118

AMP ON

O

Standby on/off control signal output to the power amplifier (IC611)
“L”: standby mode, “H”: amp on

119

VSS

—

Ground terminal

120

POWON

O

Main system power supply on/off control signal output to the BA3918 (IC671)    “H”: power on

*1  Loading/tape operation motor control

STOP

LOADING/

FORWARD

EJECT/

REVERSE

BRAKE

LM-LOD (pin <zz/ )

“L”

“H”

“L”

“H”

LM-EJ (pin <z/. )

“L”

“L”

“H”

“H”

Mode

Terminal

28

• Items marked “*” are not stocked since they

are seldom required for routine service. Some
delay should be anticipated when ordering
these items.

• The mechanical parts with no reference num-

ber in the exploded views are not supplied.

• Hardware (# mark) list and accessories and

packing materials are given in the last of the
electrical parts list.

NOTE:

• -XX and -X mean standardized parts, so they

may have some difference from the original
one.

• Color Indication of Appearance Parts

Example:
KNOB, BALANCE (WHITE) . . . (RED)

↑

↑

Parts Color Cabinet's Color

Ref. No.

Part No.

Description

Remark

Ref. No.

Part No.

Description

Remark

1

3-030-828-01 PANEL, SUB

2

X-3367-636-1 LOCK ASSY

3

3-027-437-41 DOOR, CASSETTE

4

3-935-003-01 SPRING, TORSION

* 5

A-3326-129-A MAIN BOARD, COMPLETE

* 6

3-031-828-01 BRACKET (REG. IC)

* 7

3-019-147-01 BRACKET (IC) (M)

* 8

3-031-050-02 HEAT SINK

9

3-915-923-01 SCREW, GROUND POINT

* 10

X-3373-269-1 COVER ASSY (ISO)

11

3-012-859-01 CAP (25), RUBBER

12

3-937-650-01 PLATE (C), GROUND

13

3-935-014-01 CUSHION (U)

* 14

3-009-306-01 SHEET, INSULATING

* 15

3-009-813-43 CHASSIS

16

3-042-244-11 SCREW (T)

F801

1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE) (10A)

TU1

1-693-440-23 TUNER UNIT (FM/AM TUNER UNIT)

#2

#2

#2

#2

F801

#2

#3

#4

MG-25G-136

Front panel section

#2

not supplied

TU1