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25

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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 tuner unit (A/D input)

3

NIL

I

Not used

4, 5

KEYIN1,

KEYIN0

I

Key input terminal (A/D input)

6

RCIN0

I

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

7, 8

NIL

I

Not used

9

DSTSEL

I

Destination setting terminal    Fixed at center voltage in this set

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

XOUT

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” in this set)

18

LCDSO

O

Serial data output to the liquid crystal display driver

19

LCDCE

O

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

20

LCDCKO

O

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

21 to 23

NCO

O

Not used

24

SYSRST

O

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

25

BUSON

O

Bus on/off control signal output to the SONY bus interface    “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

NIL

I

Not used

28

BUIN

I

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

29

SIRCS

I

SIRCS remote control signal input from the remote control receiver

30, 31

NIL

I

Not used

32

VDD2

—

Power supply terminal (+5V)

33

RESET

I

System reset signal input from the reset signal generator and reset switch
“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

36

PW_ON

O

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

37

NCO

I

Not used

38

ACCIN

I

Accessory detection signal input    “L”: accessory on

39

NCO

O

Not used

40

TELATT

I

Telephone attenuate signal input terminal   At input of “H”, the signal is attenuated by –20 dB
Not used

41

VPP

I

Not used

42

BUSSO

O

Serial data output to the SONY bus interface

43

BUSSI

I

Serial data input from the SONY bus interface

44

BUSCKO

O

Serial data transfer clock signal output to the SONY bus interface

26

Pin No.

Pin Name

I/O

Description

45

IIC SIO

I/O

Two-way data IIC bus with the tuner unit and electrical volume

46

NCO

O

Not used

47

IIC CKO

O

IIC bus clock signal output to the tuner unit and electrical volume

48

AMPON

O

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

49

AMPATT

O

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

50

ATT

O

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

51

NCO

O

Not used

52

AMSON

O

Tape auto music sensor control signal output to the tape equalizer amplifier
“L”: auto music sensor on

53

F/ROUT

O

Forward/reverse control signal output to the tape equalizer amplifier
“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 tape equalizer amplifier
(METAL on at “H” output)

55

TAPATT

O

Tape muting on/off control signal output to the tape equalizer amplifier    “H”: muting on
Active at ATA, FF/REW mode

56

DOLON

I/O

Dolby control in/out terminal    Not used

57

AMSIN

I

Whether a music is present or not from tape equalizer amplifier 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    “L”: muting on

60 to 64

NCO

O

Not used

65

FLASH W

I

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

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    “L”: shift key on

68 to 73

NCO

O

Not used

74

EEP SIO

I/O

Two-way data bus for tuner EEPROM with the tuner unit

75

EEP CKO

I/O

Two-way bus clock signal for tuner EEPROM with the tuner unit

76

COLSEL

I

Setting terminal for the illumination color
“L”: red    Fixed at “L” in this set

77

SWSHIFT

O

VCO shift control signal output to the tuner unit for SW
“L”: EXCEPT SW, “H”: SW

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
“H”: LED on    “H” is output to turn on the LED when front panel is opened

80, 81

REIN1, REIN0

I

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

82

A/D ON

O

A/D converter power control signal output
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

83

ILLON

O

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

84

REL

I

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

27

Pin No.

Pin Name

I/O

Description

85

POS3

I

86

POS2

I

87

POS0

I

88

POS1

I

89

LMLOD

O

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

90

LMEJ

O

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

91

TAPEON

O

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

92

CMON

O

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

93

NOSESW

I

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

94

NCO

O

Not used

95

DAVSS

—

Ground terminal (for D/A converter)

96 to 99

NCO

O

Not used

100

DAVDD

—

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

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.

• Accessories are given in the last of the elec-

trical 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

X-3381-588-2 PANEL ASSY, SUB

2

1-792-195-11 CABLE, FLEXIBLE FLAT (14CORE)

3

X-3381-381-3 LOCK ASSY

* 4

1-676-603-21 SUB BOARD

5

3-040-990-01 BUTTON (EJECT) (Z)

6

3-935-003-01 SPRING, TORSION

7

3-027-437-12 DOOR, CASSETTE

8

X-3376-699-6 GEAR ASSY

9

3-243-177-01 CUSHION (SUB PANEL)

11

3-376-464-11 SCREW (+PTT 2.6X6), GROUND POINT

* 12

3-046-991-01 SPACER (COVER R)

* 13

3-046-990-01 SPACER (COVER L)

14

3-040-995-21 COVER

15

3-012-859-21 CAP (25), RUBBER

* 16

3-045-878-01 PLATE (TU), GROUND

* 17

3-045-877-02 CUSHION (TU)

18

3-244-934-01 INSULATED PLATE

19

3-040-994-31 CHASSIS

20

1-776-206-21 CORD (WITH CONNECTOR) (POWER)

22

3-042-244-01 SCREW (T)

F781

1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE) (10A/32V)

#1

7-685-793-09 SCREW +PTT 2.6X8 (S)

#2

7-685-791-09 SCREW +PTT 2.6X5 (S)

#3

7-685-792-09 SCREW +PTT 2.6X6 (S)

#4

7-627-553-28 SCREW, PRECISION +P 2X2.5

MG-25F-136

#3

#2

F781

#1

#1

#1

#4

#3

#3

#3

front panel section

main board section