XR-3100R, XR-C33R - Sony Car Audio Service Manual (repair manual). Page 33

33

Pin No.

Pin Name

I/O

Description

75

DAVN

I

Data transmit completed detect signal input from the RDS decoder (IC51)    “H” active

76

KEYACK

I

Input of acknowledge signal for the key entry    Acknowledge signal is input to accept function
and eject keys in the power off status    On at input of “H”

77

BU-IN

I

Battery detect signal input from the SONY bus interface (IC701) and battery detect circuit
“L” is input at low voltage    IC701: Used for the XR-C33R only

78

ILL IN

I

Auto dimmer control illumination line detection signal input terminal
“L” is input at dimmer detection    Fixed at “L” in this set

79

TEL-ATT

I

Telephone muting signal input terminal    At input of “H”, the signal is attenuated by –20 dB
Not used (open)

80

NOSESW

I

Front panel block remove/attach detection signal input terminal
“L”: front panel is attached

81

ACC IN

I

Accessory detect signal input terminal    “L”: accessory on

82 to 85

NCO

O

Not used (open)

86

HSTX

I

Hardware standby input terminal    “L”: hardware standby mode    Reset signal input in this set

87

MD2

I

Setting terminal for the CPU operational mode (fixed at “L” in this set)

88, 89

MD1, MD0

I

Setting terminal for the CPU operational mode (fixed at “H” in this set)

90

RESET

I

System reset signal input from the reset signal generator (IC652) and reset switch (S503)
“L”: reset    “L” is input for several 100 msec after power on, then it changes to “H”

91

VSS

—

Ground terminal

92

X0

I

Main system clock input terminal (3.68 MHz)

93

X1

O

Main system clock output terminal (3.68 MHz)

94

VCC

—

Power supply terminal (+5V)

95 to 99

NCO

O

Not used (open)

100

9K/10K

I

AM frequency step (9 kHz or 10 kHz) selection signal input terminal
“L”: 9 kHz, “H”: 10 kHz    Not used (open)

101

NCO

O

Not used (open)

102

MTLIN

I

Auto metal detection signal input terminal    “L”: auto metal    Fixed at “L” in this set

103

AMSIN

I

Whether a music is present or not from CXA2509AQ (IC301) is detected at auto music sensor
“L”: music is present, “H”: music is not present

104

REEL

I

Rotation detect signal input from supply reel sensor and take-up reel sensor on the deck
mechanism

105

POS0

I

106

POS1

I

107

POS2

I

108

POS3

I

109

LM-EJ

O

Motor drive signal output to the loading/tape operation motor drive (IC361)    “H” active
(For the eject direction and reverse side operation)    *1

110

LM-LOD

O

Motor drive signal output to the loading/tape operation motor drive (IC361)    “H” active
(For the loading direction and forward side operation)    *1

111

CM-ON

O

Capstan/reel motor (M901) drive signal output terminal    “H”: motor on

112

TAPEON

O

Tape system power supply on/off control signal output terminal    “H”: tape on

113

N-ROUT

O

Forward/reverse direction control signal output to the CXA2509AQ (IC301)
“L”: forward direction, “H”: reverse direction

114

AMSON

O

Tape auto music sensor control signal output to the CXA2509AQ (IC301)
“L” is output to lower the gain for audio level at FF/REW mode

115

MTLON

I/O

Tape position (EJECT/FF/REW/
REV/FWD mode) detect input from
the tape operation switch on the deck
mechanism

POS0: “L”: EJECT mode, “H”: others mode
POS1: “L”: FF and FWD mode, “H”: others mode
POS2: “L”: REW mode, “H”: others mode
POS3: “L”: REV and EJECT mode, “H”: others mode

METAL control in/out terminal
At initial mode: auto/manual mode selection input of METAL function (manual at “L” input)
At manual mode: METAL on/off control signal output terminal (METAL on at “H” output)
At auto mode: input at MTLIN (pin <z/x)