XR-C7200R - Sony Car Audio Service Manual (repair manual). Page 22

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44

SCK

I

Serial data reading clock signal input from the system controller (IC501) (for SONY bus)

45

SI

I

Serial data input from the SONY bus interface (IC571)

46

SO

O

Serial data output to the SONY bus interface (IC571)

47

VDD

—

Power supply terminal (+5V)

48

AVDD

—

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

49

VREF

I

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

50 to 52

NIL

I

Not used (fixed at “L”)

53

MUTE-SEL

I

Setting terminal for the muting selection (fixed at “L”)

54

DIST-SEL1

I

Destination setting terminal (fixed at “L”)

55

DIST-SEL0

I

Destination setting terminal (fixed at “L”)

56

S-METER (AM)

I

AM signal meter voltage detection input from the FM/AM tuner unit (TU10)

57

S-METER (FM)

I

FM signal meter voltage detection input from the FM/AM tuner unit (TU10)

58 to 60

NIL

I

Not used (fixed at “L”)

61

MODE2

O

Tuner system power supply on/off control signal output to the BA3918 (IC601)    “H”: tuner on

62

NCO

O

Not used (open)

63

RECEIVE

O

Seek control signal output to the FM/AM tuner unit (TU10)

64

BST-ON

O

Bass-boost control signal output to the power amplifier (IC701)    “H”: bass-boost on

65

MODE1

O

FM system power supply on/off control signal output to the BA3918 (IC601)    “H”: FM on

66

TUNER-MUTE

O

FM and AM signal muting on/off control output    “H”: muting on

67

AF-SEEK

O

AF seek control signal output terminal    Not used (pull down)

68

NCO

O

Not used (open)

69

—

I

Not used (fixed at “H”)

70

ST-IN/MONO

I/O

71

SD-IN

I

Station detector detect input from the FM/AM tuner unit (TU10)
Stop level for SEEK, BTM, etc. is determined    SD is present at input of “H”

72

NCO

O

Not used (open)

73

FWD/REV

O

Forward/reverse direction control signal output to the CXA2510AQ (IC210)
“H: reverse direction, “L”: forward direction

74

AMSON

O

Tape auto music sensor control signal output to the CXA2510AQ (IC210)
“L” is output to lower the gain for audio level at FF/REW

75 to 80

NCO

O

Not used (open)

Input of FM stereo detection signal from FM/AM tuner unit (TU10), and output of forced
monaural control signal to FM/AM tuner unit (TU10)  (Commonly used for stereo display input
and forced monaural output)
FM stereo detection at input of “L”, forced monaural at output of “L”

*1  loading/tape operation motor control

                           MODE

 TERMINAL

LMLOD (pin #∞)

“L”

“H”

“L”

“H”

LMEJ (pin #¢)

“L”

“L”

“H”

“H”

STOP

LOADING/

FORWARD

EJECT/

REVERSE

BRAKE