DHC-MD777, HMC-MD777 - Sony Audio Service Manual (repair manual). Page 84

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Pin No.

Pin Name

I/O

Function

33

BUSD0

O

CD digital signal selection control signal output terminal

34

BUSD1

O

Not used (open)

35

BUSD2

O

Not used (open)

36

I2CHELP

(BUSD3)

O

Busy signal output for the I2C bus    “L” active

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    Not used (open)

42

XT1

I

Sub system clock input terminal    Not used (fixed at “L”)

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

I2CHELP

(BUSCLK)

I

Busy signal input for the I2C bus    “L” active

45

BUSBSY

O

Busy signal output when bus data in/out operation    Not used (open)

46

SCOR

I

Subcode sync (S0+S1) detection signal input from the CXD2587Q (IC101) on the CD block

47

DQSY

I

Data read enable signal input terminal    Not used (open)

48

AC CUT

I

Power down detection input terminal    “L”: power down

49

JOG0

I

Jog dial pulse input from the rotary encoder (S681 

≠ C c ±) (A phase input)

50

JOG1

I

Jog dial pulse input from the rotary encoder (S681 

≠ C c ±) (B phase input)

51

AVDD

—

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

52

AVREF0

I

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

53

KEY0

I

Key input terminal (A/D input)
S604, S613, S661 to S665 (REPEAT, CLEAR, CD 1/2/3/4/5) keys input

54

KEY1

I

Key input terminal (A/D input)
S611, S612, S671 to S676 (MENU/NO, ENTER/YES, 

§ CD 1/2/3/4/5, DISC SKIP) keys input

55

KEY2

I

Key input terminal (A/D input)    S602, S603, S606 to S610, S636 (1/ALL, PLAY MODE, 

fl, 

π, 0, ), NAME EDIT, DISPLAY) keys input

56

SELECT0

I

Setting terminal for the Japanese letter input functions
“L”: input possible (fixed at “H” in this set)

57

SELECT1

I

Setting terminal for the separate/complete type setting of CD section and others section 
(amplifier, tuner, etc.)    “L”: separate type, “H”: complete type (fixed at “L” in this set)

58

SELECT2

I

GFS NG when search mode (A/D input)

59

DISC SENS

I

Detection input from the disc in detect sensor (D704 and Q703) on the CD mechanism block
“H”: disc detected

60

CNT SW

I

Detection input from the count detect switch (S706) on the CD mechanism block
“L”: when elevator up/down each sub tray stock position

61

AVSS

—

Ground terminal (for A/D converter analog system)

62

MECHA JIG

I

Test input terminal (fixed at “L”)

63

CHECK

O

Not used (open)

64

AVREF1

I

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

65

SRDT

I

Serial data input terminal    Not used (open)

66

OPEN

O

Not used (open)

67

SCLK

O

Serial data transfer clock signal output terminal    Not used (open)

68

SUBQ

I

Subcode Q data input from the CXD2587Q (IC101) on the CD block

69

OPEN

O

Not used (open)

70

SQCLK

O

Subcode Q data reading clock signal output to the CXD2587Q (IC101) on the CD block