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25

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

26

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

*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

27

•

Pin No.

Pin Name

I/O

Description

1

VDD

—

Power supply terminal (+5V)

2

VSS

—

Ground terminal

3

XIN

I

System clock input terminal (4 MHz)

4

XOUT

O

System clock output terminal (4 MHz)

5

CNVSS

—

Ground terminal

6

RESET

I

Reset signal input trminal    “L”: reset

7, 8

F0, F1

—

Not used

9

SIRCS IN

I

SIRCS signal input from the remote control receiver (IC902)

10

G1/INT

—

Not used

11, 12

G2, G3

—

Not used (open)

13 to 16

S3 to S0

—

Not used (fixed at “L”)

17

SIRCS OUT

O

SIRCS signal output to the system controller (IC501)

18 to 20

D2/C, D1, D0

—

Not used (fixed at “L”)

28

MG-25G-136

#3

F781

#1

#1

#1

#1

#9

#5

#1

TU1

#4

#3

#2

#3

#2

#3

Front panel assy

not
supplied

A

A

• 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

X-3378-397-7 PANEL ASSY, SUB

* 2

1-676-603-21 SUB BOARD

3

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

4

X-3377-621-5 LOCK ASSY

5

3-040-990-01 BUTTON (EJECT) (Z)

6

3-935-003-01 SPRING, TORSION

7

3-027-437-12 DOOR, CASSETTE

8

X-3376-699-4 GEAR ASSY

9

3-713-786-51 SCREW +P 2X3

10

3-030-909-03 DAMPER, OIL

* 11

3-040-994-03 CHASSIS

* 12

3-040-995-03 COVER

13

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

14

1-782-381-11 CORD (WITH CONNECTOR) (ISO P&S)

(POWER) (Polish, Czech, Turkish, Slovak,

Hungarian, Russian, Israeli, Ukrainian,

Slovenian, Croatian, and Romanian)

15

1-777-989-41 CORD (WITH CONNECTOR) (AMP REM/ATT)

16

3-012-859-21 CAP (25), RUBBER

* 17

3-045-878-01 PLATE (TU), GROUND

* 18

3-045-877-02 CUSHION (TU)

19

A-3340-041-A MAIN BOARD, COMPLETE

* 20

3-040-998-01 BRACKET (IC)

* 21

3-041-262-01 HEAT SINK (REG/XR)

* 22

3-041-014-11 HEAT SINK (ISO2P)

* 23

3-046-990-01 SPACER (COVER L)

* 24

3-046-991-01 SPACER (COVER R)

* 25

3-045-828-01 INSULATED PLATE

F781

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

TU1

A-3220-812-A FM/AM TUNER UNIT (TUX-020//Q2)