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25

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Pin No.

Pin Name

I/O

Description

1

VREF –

—

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

2

VSM

I

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

3 to 6

NC

—

Not used

7

NOISE-DET

I

Not used

8

MPTH

I

Not used

9

NC

—

Not used

10

VREF +

—

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

11

VDD

—

Power supply terminal (+5V)

12

OSC2

O

Main system clock output terminal (18.432 MHz)

13

OSC1

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

XO

O

Sub system clock output terminal (32.768 kHz)

17

GND (MMOD)

—

Setting terminal for the single chip mode     “L”: single chip

18

LCD-SO (TX)

O

LCD serial data output to the liquid crystal display driver

19

LCD-SI (RX)

I

LCD serial data input from the liquid crystal display driver

20

LCD-CKO

O

LCD serial transfer clock signal output to the liquid crystal display driver

21

TU-SDA

O

Serial data output to the tuner unit

22

TU-SI

I

Serial data input from the tuner unit

23

TU-SCL

O

Serial data transfer clock signal output to the tuner unit

24

LCD-RES

O

LCD reset signal output to the liquid crystal display driver    “L”: reset

25

LCD-CE

O

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

26

KEYACK

I

Key acknowledge signal detect input from the liquid crystal display driver

27

DAVN-RDS

I

Not used

28

B/U-IN

I

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

29

NC

—

Not used

30

RAM BU

I

Internal RAM reset detection signal input
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset     “L”: RAM reset

31

TEST-IN

I

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

32

NCI

I

Not used

33

RESET

I

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

34

TU-ENABLE

O

Chip enable signal output to the tuner unit    “H” active

35

BEEP

O

Beep sound drive signal output to the power amplifier

36

POWER-ON

O

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

37

ILL-IN

I

Not used

38

ACC-IN

I

Accessory detection signal input    “L”: accessory on

39

NC

—

Not used

40

TEL-MUTE

I

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

41

NCI

I

Not used

42

UNI-SO

O

Serial data output to the SONY bus interface

43

UNI-SI

I

Serial data input from the SONY bus interface

44

UNI-CKO

O

Serial data transfer clock signal output to the SONY bus interface

26

Pin No.

Pin Name

I/O

Description

45

SDA

I/O

Not used

46

NC

—

Not used

47

SCL

O

Not used

48

VOL-SO

O

Serial data output to the electrical volume

49

VOL-CE

O

Chip enable signal output to the electrical volume    “H” active

50

VOL-CKO

O

Serial data transfer clock signal output to the electrical volume

51

AMP-ON

O

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

52

AMP-MUTE

O

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

53

MUTE

O

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

54

TU-MUTE

O

Not used

55

PORT2 (ST)

I

FM stereo broadcasting detection signal input from the tuner unit
“H”: stereo display lighting

56

NC

—

Not used

57

LO/DX

O

Local/DX control signal output to the tuner unit    “L”: DX, “H”: local

58

TU-ON

O

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

59

FM-ON

O

FM system power supply on/off control signal output terminal
“L”: AM power on, “H”: FM power on    Not used

60

AM-ON

O

AM system power supply on/off control signal output terminal
“L”: FM power on, “H”: AM power on    Not used

61 to 68

NC

—

Not used

69

NOISE-ON

O

Not used

70 to 82

NC

—

Not used

83

ILL-COLOR

I

Illumination color selection signal input    “L”: amber illumination    “H”: green illumination    
(fixed at “H” in this set)

84

DEST-SEL0

I

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

85

DEST-SEL1

I

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

86

DEST-SEL2

I

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

87, 88

NC

—

Not used

89

NOSE-SW

I

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

90

FLASH-W

I

Internal flash memory data write mode detection signal input
“L”: data write mode    Normally: fixed at “H”

91

NC

—

Not used

92

ILL-ON

O

Power on/off control signal output of the illumination LED and LCD back light
“H”: power on

93

BUS-ON

O

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

94

SYS-RST

O

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

95

DAVSS

—

Ground terminal (for D/A converter)

96

TAPE-ON

O

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

97

N/R

I

Tape direction switch input terminal    “L”: reverse direction, “H”: forward direction

98

FF/REW

I

FF/REW detection switch input terminal    “L”: FF/REW mode

99

TAPE-IN

I

Tape in detection switch input terminal    “L”: tape in

100

DAVDD

—

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

27

• 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

3-224-905-01 PANEL, SUB

2

X-3370-437-3 LOCK ASSY

3

3-041-581-11 DOOR, CASSETTE

4

3-044-125-01 SPRING, TORSION

5

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

6

1-776-207-31 CORD (WITH CONNECTOR) (POWER)

* 7

X-3378-167-1 COVER ASSY, TOP

8

A-3340-273-A MAIN BOARD, COMPLETE

* 9

3-224-921-01 HEAT SINK

* 10

3-041-578-01 BRACKET (IC)

11

3-937-650-01 PLATE (C), GROUND

* 12

3-046-339-01 CUSHION (U)

13

3-232-738-01 INSULATED PLATE

* 14

3-047-715-01 CHASSIS

15

3-041-599-11 COLLAR

16

3-042-244-01 SCREW (T)

F901

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

TU100

1-693-524-12 TUNER UNIT (FAE370-A02)

#2

7-685-792-09 SCREW +PTT 2.6X6 (S)

#3

7-685-794-09 SCREW +PTT 2.6X10 (S)

28

Ref. No.

Part No.

Description

Remark

Ref. No.

Part No.

Description

Remark

51

3-224-928-01 BUTTON (4-6) (4. 5. 6. BTM. DSPL)

52

3-224-912-01 BUTTON (1-3) (ATT. SENS. 1. 2. 3)

53

3-224-913-01 BUTTON (RELEASE)

54

3-220-522-01 SPRING (RELEASE)

55

3-224-911-51 PANEL, FRONT

56

3-224-930-01 BUTTON (+/-)

57

3-224-908-01 BUTTON (SRC. MODE. SEL)

58

3-224-917-21 BUTTON (EJECT) (Z)

59

3-029-327-01 SPRING (EJECT)

60

3-224-916-21 BUTTON (REW) (m)

61

3-375-372-01 SPRING (F/R)

62

3-224-915-21 BUTTON (FF) (M)

63

3-224-907-01 BUTTON (D-BASS) (MBP. D. OFF)

64

3-224-929-01 BUTTON (SEEK)

(+ > M SEEK AMS m . -)

* 65

3-224-927-01 PLATE (LCD), GROUND

66

1-694-696-31 CONDUCTIVE BOARD, CONNECTION

* 67

3-224-926-01 ILLUMINATOR

68

3-236-778-01 PLATE, LIGHT GUIDE

69

1-786-305-11 SWITCH, SHEET

70

3-224-904-01 PANEL, FRONT BACK

* 71

3-224-924-01 HOLDER (LCD)

* 72

A-3315-776-A PANEL ASSY, FRONT

73

X-3378-490-2 CASE (PANEL) ASSY (for FRONT PANEL)

LCD900 1-804-512-11 DISPLAY PANEL, LIQUID CRYSTAL
#4

7-685-106-19 SCREW +P 2X10 TYPE2 NON-SLIT