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22

Pin No.

Pin Name

I/O

Description

38

ACC IN

I

Accessory detection signal input    “L”: accessory on

39

TESTIN

I

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

40

TELATT

I

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

41

UNICLI

I

Serial data transfer clock signal input from the SONY bus interface (IC581)

42

UNISO

O

Serial data output to the SONY bus interface (IC581)

43

UNISI

I

Serial data input from the SONY bus interface (IC581)

44

UNICKO

O

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

45

I2C SIO

I/O

Two-way data bus with the electrical volume (IC331) and FM/MW/SW tuner unit (TU1)

46

VOLATT

O

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

47

I2C CKO

O

Clock signal output to the electrical volume (IC331) and FM/MW/SW tuner unit (TU1)

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

TU ATT

O

Muting on/off control signal output of the FM and AM tuner signal    “H”: muting on
Not used (open)

52

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

53

NROUT

O

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

54

MTLON

I/O

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 es)

55

TAPATT

O

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

56

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”)

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

4VPREOUT model setting terminal    “L”: 4VPREOUT model    Fixed at “H” in this set

59 to 73

—

O

Not used (open)

74

E2P SIO

I/O

Two-way data bus with the FM/MW/SW tuner unit (TU1)

75

E2P CKO

O

Clock signal output to the FM/MW/SW tuner unit (TU1)

76

—

O

Not used (open)

77

SWSHIFT

O

AM filter control signal output to the FM/MW/SW tuner unit (TU1)    “L”: SW mode

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 tape window and Z indicator (LED801, LSW801)
“H”: LED on    “H” is output to turn on LED when front panel is opened

80

REIN1

I

81

REIN0

I

82

AD 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
(IC901)    “H”: power on

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

23

Pin No.

Pin Name

I/O

Description

84

REL

I

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

85

POS3

I

86

POS2

I

87

POS0

I

88

POS1

I

89

LMLOD

O

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

90

LMEJ

O

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

91

TAPON

O

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

92

CMON

O

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

93, 94

—

O

Not used (open)

95

DAVSS

—

Ground terminal (for D/A converter)    Not used (open)

96

NS MASK

O

Discharge control signal output terminal    “H”: discharge    Not used (open)

97 to 99

—

O

Not used (open)

100

DAVDD

—

Power supply terminal (+5V) (for D/A converter)    Not used (open)

Tape position (EJECT/FF/REW/
REV/FWD mode) detection signal
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

*1  Loading/tape operation motor control

STOP

LOADING/

FORWARD

EJECT/

REVERSE

BRAKE

LMLOD (pin il)

“L”

“H”

“L”

“H”

LMEJ (pin o;)

“L”

“L”

“H”

“H”

Mode

Terminal

24

• 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

A-3326-181-A MAIN BOARD, COMPLETE

* 2

3-040-994-01 CHASSIS

* 3

3-045-878-01 PLATE (TU), GROUND

4

X-3377-621-1 LOCK ASSY

5

3-040-990-01 BUTTON (EJECT) (Z)

* 6

1-676-603-11 SUB BOARD

7

3-027-437-11 DOOR, CASSETTE

8

3-935-003-01 SPRING, TORSION

* 9

3-045-877-01 CUSHION (TU)

10

X-3376-699-1 GEAR ASSY

11

3-030-909-01 DAMPER, OIL

12

3-713-786-51 SCREW +P 2X3

* 13

3-045-828-01 INSULATED PLATE

* 14

3-040-996-11 HEAT SINK (2P)

15

3-012-859-01 CAP (25), RUBBER

16

3-915-923-01 SCREW, GROUND POINT

17

1-777-184-11 CORD (WITH CONNECTOR) (POWER)

* 18

3-046-991-01 SPACER (COVER R)

* 19

3-046-990-01 SPACER (COVER L)

* 20

3-040-995-01 COVER

* 21

3-040-998-01 BLACKET (IC)

* 22

3-041-262-01 HEAT SINK (REG/XR)

23

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

24

X-3378-397-1 PANEL ASSY, SUB

25

3-224-530-01 SHEET (L)

26

3-224-529-01 SHEET (R)

27

3-224-528-01 CUSHION

F781

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

TU1

A-3220-812-A FM/MW/SW TUNER UNIT (TUX-020)

F781

TU1

#1

#3

#3

#3

#2

#3

#3

#3

#4

#9

#5

#1

#2

#2

#2

#10

#2

Front panel section

not supplied

MG-25F-136

25

Ref. No.

Part No.

Description

Remark

Ref. No.

Part No.

Description

Remark

51

3-040-980-01 BUTTON (SOURCE)

52

3-040-981-11 KNOB (VOL)

53

3-041-005-11 BUTTON (D) (D-BASS)

54

3-221-784-01 BUTTON (OPEN)

55

3-037-267-01 SPRING (OPEN)

56

3-040-987-01 BUTTON (OFF)

57

3-040-988-01 BUTTON (1-6) (1. 2. 3. 4. 5. 6)

58

3-040-985-01 BUTTON (DIR/ENTER) (MODE o. ENTER)

59

3-040-986-01 BUTTON (MENU/SOUND)

* 60

3-040-997-01 PLATE (LCD), GROUND

* 61

3-041-371-11 SHEET (REFLECTOR)

* 62

3-040-993-01 PLATE (LCD), LIGHT GUIDE

63

1-694-660-11 CONDUCTIVE BOARD, CONNECTION

* 64

3-040-992-01 HOLDER (LCD)

65

X-3378-398-1 PANEL ASSY, FRONT BACK

66

3-045-596-01 CUSHION (OFF)

67

X-3378-581-1 PANEL SUB ASSY

LCD901 1-803-907-11 DISPLAY PANEL, LIQUID CRYSTAL

#6

LCD901

#6

not supplied
(KEY board)