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– 46 –

•

Pin No.

Pin Name

I/O

Function

1, 2

NC

O

Not used (open)

3

NC

I

Not used (fixed at “L”)

4

REQ

O

Request signal output to the system controller (IC201)    “L” active

5

CCLK

I

Serial data transfer clock signal input from the system controller (IC201)

6

CSI

I

Serial data input from the system controller (IC201)

7

CSO

O

Serial data output to the system controller (IC201)

8

SCLK

O

Clock signal output for subcode data reading to the CXD2530Q (IC101)

9

SSI

I

Subcode data input from the CXD2530Q (IC101)

10

NC

O

Not used (open)

11 to 18

ADD0 to ADD7

O

Address signal output to the S-RAM (IC502)

19

NC

I

Not used (fixed at “L”)

20 to 27

DATA0 to DATA7

I/O

Two-way data bus with the S-RAM (IC502)

28

RST

I

System reset signal input from the system controller (IC201), SONY bus interface (IC302) and 
reset signal generator (IC304)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

29

EXTAL

I

System clock input terminal (10 MHz)

30

XTAL

O

System clock output terminal (10 MHz)

31

VSS

—

Ground terminal

32 to 55

NC

O

Not used (open)

56

BUSY

O

Busy signal output to the system controller (IC201)    “L”: busy status

57 to 61

NC

O

Not used (open)

62

CE

O

Chip enable signal output to the S-RAM (IC502)    “L” active

63

WE

O

Data write enable signal output to the S-RAM (IC502)    “L” active

64 to 69

ADD8 to ADD13

O

Address signal output to the S-RAM (IC502)

70

VDD

—

Power supply terminal (+5V)

71

NC

O

Not used (open)

72

NC

I

Not used (fixed at “L”)

73

NC

I

Not used (fixed at “H”)

74

ADD14

O

Address signal output to the S-RAM (IC502)

75

NC

O

Not used (open)

76

SCOR

I

Subcode sync (S0+S1) detection signal input from the CXD2530Q (IC101)

77

WFCK

I

Write frame clock (7.35 kHz) signal input from the CXD2530Q (IC101)

78

BUCK

I

Backup power supply detection signal input terminal (used also to reset standby)

79, 80

NC

I

Not used (fixed at “L”)

– 47 –

The components identified by
mark 

! or dotted line with mark

! are critical for safety.

Replace only with part number
specified.

• 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

3-010-104-01 DAMPER (250)

* 2

3-010-097-01 COVER (LOWER T)

3

1-664-628-11 JACK FLEXIBLE BOARD

* 4

1-673-252-11 JACK BOARD

5

X-3376-772-1 DOOR (616T) ASSY

6

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

7

3-022-002-52 PANEL (T), FRONT

8

3-012-388-01 SCREW (M2X3)

9

3-022-006-01 ESCUTCHEON (T)

10

3-022-007-01 BUTTON (EJT) (

6)

* 11

3-022-012-01 HEAT SINK (T)

12

3-010-103-01 SPRING (FL), TENSION

13

3-010-101-01 LEVER (FLT)

* 14

3-010-096-01 COVER (UPPER T)

* 15

A-3317-431-A MAIN BOARD, COMPLETE

* 16

3-032-997-01 HOLDER (TR4)

17

3-935-636-11 SCREW (FP)

18

X-3375-357-1 ARM (FLT) ASSY

* 19

3-013-658-01 SHEET (FJT), PROTECTION

20

X-3375-360-1 ARM (FRT) ASSY

* 21

3-024-065-01 CUSHION (EJECT)

22

3-024-067-01 CUSHION (T), BATTERY

23

3-028-802-01 SPACER (MOUNT 30)

Q307

8-729-019-00 TRANSISTOR   2SD2394-G

Q309

8-729-019-00 TRANSISTOR   2SD2394-G

#2

#2

#2

#3

#2

#2

#1

not supplied

main flexible board

MG-250C-137

Q307

Q309

– 48 –

Ref. No.

Part No.

Description

Remark

Ref. No.

Part No.

Description

Remark

51

X-3375-497-1 CHASSIS (U) SUB ASSY

52

3-024-161-01 SPRING (SUT)

#3

#3

#3

53

4-965-759-01 WASHER, POLYETHYLENE

54

3-011-997-01 SPRING (STOPPER. LOWER)

– 49 –

Ref. No.

Part No.

Description

Remark

Ref. No.

Part No.

Description

Remark

101

3-024-170-01 SPRING (SB), TENSION

* 102

3-024-172-01 BRACKET (EVM)

103

X-3375-498-4 CHASSIS (D) SUB ASSY

M104

A-3301-123-A ELJ MOTOR ASSY (ELEVATOR)

M104

#12