STR-MD777 - Sony Audio Service Manual (repair manual). Page 7

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Pin No.

Pin Name

I/O

Function

1 to 6

NC

O

Not used (open)

7

STANBY LED

O

LED drive signal output of the power on/standby indicator (D602)
“L”: power on, “H”: standby

8

TIMER LED

O

LED drive signal output of the TIMER indicator (D601)    “L”: LED on

9

VDD

—

Power supply terminal (+5V)

10

SPEC1

I

Initial setting input terminal    Fixed at “L” in this set

11

SPEC2

I

Initial setting input terminal    Fixed at “H” in this set

12

SPEC3

I

Initial setting input terminal    Fixed at “L” in this set

13

SPEC4

I

Initial setting input terminal    Fixed at “H” in this set

14

EWS OUT

O

Standby ok signal output to the EWS circuit    Not used (open)

15

EWS-IN

I

Monitor signal input from the EWS circuit    Not used (fixed at “H”)

16

EWS-STNBY

I

Standby display control signal input from the EWS circuit    Not used (fixed at “H”)

17

EWS-WARNING

I

Warning display control signal input from the EWS circuit    Not used (fixed at “H”)

18

EWS-TEST

I

Test display control signal input from the EWS circuit    Not used (fixed at “H”)

19

IF-NG

O

Not used (open)

20

AM-MONO

O

Not used (open)

21

NC

O

Not used (open)

22

TEST

I

Test input terminal (fixed at “L”)

23

ENC-VOLA

I

Jog dial pulse input from the rotary encoder (S616  Master Volume) (A phase input)

24

ENC-VOLB

I

Jog dial pulse input from the rotary encoder (S616  Master Volume) (B phase input)

25

ENC-JOG1A

(TUNER)

I

Jog dial pulse input from the rotary encoder (S615  TUNING – 

C c +)

(A phase input)

26

ENC-JOG1B

(TUNER)

I

Jog dial pulse input from the rotary encoder (S615  TUNING – 

C c +)

(B phase input)

27

ENC-JOG2A

(EDIT)

I

Jog dial pulse input from the rotary encoder (S639  SELECTOR – 

C c +)

(A phase input)

28

ENC-JOG2B

(EDIT)

I

Jog dial pulse input from the rotary encoder (S639  SELECTOR – 

C c +)

(B phase input)

29

ST-MUTE

O

Muting control signal output to the FM/AM tuner unit    “L”: muting on

30

STEREO

I

Stereo detection signal input from the FM/AM tuner unit    “L”: stereo

31

TUNED

I

Tuned display detection signal input from the FM/AM tuner unit    “L”: tuned

32

ST-CE

O

PLL chip enable signal output to the FM/AM tuner unit

33

ST-DOUT

O

PLL serial data output to the FM/AM tuner unit

34

ST-DIN

I

PLL serial data input from the FM/AM tuner unit

35

ST-CLK

O

PLL serial data transfer clock signal output to the FM/AM tuner unit

36

NC

O

Not used (open)

37

VDD

—

Power supply terminal (+5V)

38

X2

O

Main system clock output terminal (12.5 MHz)

39

X1

I

Main system clock input terminal (12.5 MHz)

40

VSS

—

Ground terminal

41

XT2

O

Sub system clock output terminal (32.768 kHz)

42

XT1

I

Sub system clock input terminal (32.768 kHz)

43

RESET

I

System reset signal input terminal (Power down detect signal used as a reset signal)
 “L”: reset or power down
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

44

RDS-CLK

I

Not used (fixed at “L”)

45

RDS-DATA

I

Not used (fixed at “L”)