MDX-C7890R - Sony Car Audio Service Manual (repair manual). Page 29

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47

UNIREQ

O

Data request signal output terminal (for SONY bus)    “H”: request on    Not used (open)

48

UNCKI

I

Serial data transfer clock signal input from the master controller (IC700) (for SONY bus)

49

UNISI

I

Serial data input from the SONY bus interface (IC600)

50

UNISO

O

Serial data output to the SONY bus interface (IC600)

51

MD-CKO

O

Serial data transfer clock signal output to the CXD2652AR (IC301) and CXA2523R (IC302)

52

MD-SI

I

Reading serial data signal input from the CXD2652AR (IC301)

53

NCO

O

Not used (open)

54

SENS

I

Internal status (SENSE) input from the CXD2652AR (IC301)

55

CC-XINT

I

Interrupt status input from the CXD2652AR (IC301)

56

LIMIT-IN

I

Detection input from the sled limit-in detect switch (S903)
The optical pick-up is inner position when “L”

57

EJT-KEY

I

Eject request signal input terminal    “L”: eject on    Not used (fixed at “H”)

58

ERROR-PWM

O

PWM error monitor output terminal (C1and ATER is output when test mode)    Not used (open)

59

MD-RST

O

Reset signal output to the CXD2652AR (IC301) and BH6511FS (IC303)    “L”: reset

60

BU-IN

I

Battery detect signal input from the SONY bus interface (IC600) and battery check circuit
“H”: battery on

61

BUS-ON

I

SONY bus on/off control signal input from the master controller (IC700)    “L”: bus on

62

SQSY

I

Subcode Q sync (SCOR) input from the CXD2652AR (IC301)
“L” is input every 13.3 msec    Almost all, “H” is input

63

C-SW

I

Inputs the disc loading start or disc eject completion detect switch (S901) detection signal
“L”: When start or eject completed of the disc loading operation

64

MD-LAT

O

Serial data latch pulse signal output to the CXD2652AR (IC301) and CXA2523R (IC302)

65

MD-ON

O

Power supply on/off control signal output of the MD mechanism deck section main power supply
“H”: power on

66

DEEMP

O

Emphasis on/off control signal output terminal    “H”: emphasis on    Not used

67

A-MUTE

O

Audio muting on/off control signal output terminal    Not used

68

NCO

O

Not used (open)

69

TSTCKO

O

Output of clock signal for the test mode display    Not used (open)

70

TSTSO

O

Output of data for the test mode display    Not used (open)

71

TSTMOD

I

Setting terminal for the test mode    “L”: test mode, “H”: normal mode

72

VCC

—

Power supply terminal (+5V)

73

NC

—

Not used (fixed at “H”)

74 to 77

TOUT0 to TOUT3

O

Output of the 4

×

8 matrix test keys     Not used (open)

78 to 80

TIN0 to TIN2

I/O

Input of the 4

×

8 matrix test keys (“L” is always output, except in test mode)     Not used (open)

*1  Loading motor (M903) control

LOAD (pin 6)

“H”

“L”

“H”

“L”

EJECT (pin 7)

“L”

“H”

“H”

“L”

Terminal

Operation

IN

OUT

BRAKE

STOP