XR-1100 - Sony Car Audio Service Manual (repair manual). Page 25

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Pin No.

Pin Name

I/O

Description

1

XIN

I

System clock input terminal (4.5 MHz)

2

TEST2

I

Connected to ground

3, 4

NC

I

Not used (fixed at “L”)

5

SD

I

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

6

STEREO

I

Stereo detection signal input from the FM/AM tuner unit (TU100) (Commonly used for stereo
display input)  FM stereo detection at input of “L”

7 to 10

NC

O

Not used (open)

11

BEEP

O

Beep sound signal output terminal    “H” active

12

MUTE-REQ

I

Muting request signal input terminal (“H” active)    “L”: accessory on, “H”: accessory off

13

ILL-ON

O

Power on/off control signal output for the liquid crystal display driver (IC900), illumination lamp
and back light lamp    “H”: power on

14

N/R

I

Tape direction switch (S901) input terminal    “L”: reverse side, “H”: forward side

15

TAPE-IN

I

Tape in detection switch (S903) input terminal    “L”: tape in

16

FF-REW

I

17

K1

I

Diode matrix return signal input terminal    Not used (fixed at “L”)

18

K0

I

Diode matrix return signal input from the frequency select switch (S1)
Used for the E and UK models

19

MOTOR

O

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

20

SEEK

O

Seek control signal output to the FM/AM tuner unit (TU100)    “H” active

21

SEEK

O

Seek control signal output terminal    “L” active    Not used (open)

22

LOCAL/DX

O

Local/DX selection signal output to the FM/AM tuner unit (TU100)    “L”: DX, “H”: local

23 to 27

KS0 to KS4

O

Key matrix scan signal output terminal

28

LCD-CLK

O

Serial data transfer clock signal output to the liquid crystal display driver (IC900)

29

LCD-CE

O

Chip enable signal output to the liquid crystal display driver (IC900)    “H” active

30

LCD-DATA

O

Serial data output to the liquid crystal display driver (IC900)    “H” active

31

VDD

—

Power supply terminal (+5V)

32

KIN0

I

33

KIN1

I

Key matrix input terminal

34

KIN2

I

35

BAND-KEY

I

A MEM TUNER switch (S900, 901) input terminal    “L” is input when pressing the switch

36

T2

O

Diode matrix scan signal output to the frequency select switch (S1)
Used for the E and UK models

37

T1

O

38

T0

O

39, 40

NC

O

Not used (open)

41

MUTE

O

Audio muting on/off control signal output terminal    “H”: muting on

42

NC

O

Not used (open)

43

AMP-MUTE

O

Amp muting on/off control signal output terminal to the power amplifier (IC500)
“L”: muting on

44

ANT-REM

O

Control signal output for the external power antenna and external amplifier    “H” active

45 to 48

NC

O

Not used (open)

49

VOL-CE

O

Chip enable signal output to the electrical volume (IC400)    “H” active

50

VOL-DI

O

Serial data output to the electrical volume (IC400)    “H” active

Diode matrix scan signal output terminal    Not used (open)

FF/REW detection switch (S902) input terminal    “L”: FF/REW mode
At this time, the current display such as run display will blinking at every 1Hz.
When the ATA function is ON, entering “L” in the tape mode causes the mode to be changed
over to the radio monitor mode