XR-C2200, XR-C2300X - Sony Car Audio Service Manual (repair manual). Page 21

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Pin No.

Pin Name

I/O

Description

1

VREF–

I

Reference voltage (0V) input terminal (for A/D converter)

2

—

I

Not used (fixed at “L”)

3

KEY-IN1

I

Key input terminal (A/D input) S909 to S920
(SHUF 2, REP 1, ENTER, MODE, DSPL, SEEK/AMS + > M, PRST/DISC –, SOURCE,
DISC/PRST +, SEEK/AMS – . m, SOUND, MENU keys input)

4

KEY-IN0

I

Key input terminal (A/D input) S901 to S906 (OFF, 3, 4, 5, 6, D-BASS keys input)

5, 6

—

I

Not used (fixed at “L”)

7

VSM

I

FM and AM signal meter voltage detection signal input from the FM/AM tuner unit (TU100)
(A/D input)

8, 9

—

I

Not used (fixed at “L”)

10

VREF+

I

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

11

VDD

—

Power supply terminal (+5V)

12

OSC2

O

Main system clock output terminal (18.432 MHz)

13

OSC1

I

Main system clock input terminal (18.432 MHz)

14

VSS

—

Ground terminal

15

XI

I

Sub system clock input terminal (32.768 kHz)

16

XO

O

Sub system clock output terminal (32.768 kHz)

17

MMOD

I

Not used (fixed at “L”)

18

TAPE-ON

O

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

19

FF REW. IN

I

FF/REW detection signal input terminal    “L”: FF/REW mode

20

TAPE IN

I

Tape in detection signal input terminal    “L”: tape in

21

UNI-SO

O

Serial data output to the SONY bus interface (IC800)

22

UNI-SI

I

Serial data input from the SONY bus interface (IC800)

23

UNI-CKO

O

Serial data transfer clock signal output to the SONY bus interface (IC800)

24

N/R

I

Tape detection signal input terminal    “L”: reverse side, “H”: forward side

25

ST-IND

I/O

FM stereo broadcasting detection signal input from the FM/AM tuner unit (TU100), or forced
monaural control signal output to the FM/AM tuner unit (TU100)
“L” is input in the FM stereo mode, or “L” is output in the forced monaural mode

26

KEY-ACK

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”

27

NOSE-SW

I

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

28

BU-IN

I

Battery detection signal input from the SONY bus interface (IC800) and battery detect circuit
“L” is input at low voltage

29

—

I

Not used (fixed at “L”)

30

TEL-MUTE

I

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

31

TEST-IN

I

Setting terminal for the test mode    “L”: test mode, Normally: fixed at “H”

32

RAM-BU

I

Internal RAM reset detection signal input from the XC61BN3312MR (IC3)
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 50 msec after reset

33

RESET

I

System reset signal input from the reset signal generator (IC2) and reset switch (S2)
“L”: reset    “L” is input for several 100 msec after power on, then it changes to “H”

34

SD

I

Station detector detection signal input from the FM/AM tuner unit (TU100)
Stop level for SEEK, BTM, etc. is determined    SD is present at input of “H”

35

BEEP

O

Beep sound drive signal output to the power amplifier (IC500)
Used for the XR-C2300X only

36

PLL-SI

I

PLL serial data input from the FM/AM PLL (IC130)