XR-1300R, XR-C2300R - Sony Car Audio Service Manual (repair manual). Page 25

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Pin No.

Pin Name

I/O

Description

1

SEEKOUT

O

Seek control signal output to the FM/AM tuner unit (TU100)
AM mode: Used for IF count output/SD output request/AGC cut at SEEK or BTM
FM mode: Used for SD speed up at SEEK, BTM, or AF
“L” is output at tuner off

2

AFSEEK

O

PLL low-pass filter time constant selection signal output at AF SEEK
“H” is output when AF SEEK    Not used (open)

3

NC

O

Not used (open)

4

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

5

TUMUTE

O

Muting on/off control signal output of the FM and AM tuner signal    “H”: muting on

6

FM-ON

O

FM system power supply on/off control signal output terminal
“L”: AM power on, “H”: FM power on

7

TU-ON

O

Tuner system power supply on/off control signal output terminal    “H”: tuner power on

8

VCC

—

Power supply terminal (+5V)

9

NC

O

Not used (open)

10

BUSON

O

Bus on/off control signal output to the SONY bus interface (IC800)    “L”: bus on
Used for the XR-C2300R only

11

SYSRST

O

Reset signal output to the SONY bus interface (IC800)    “L”: reset
Used for the XR-C2300R only

12

NOSESW

I

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

13

LCDSO

O

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

14

LCD CKO

O

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

15

BEEP

O

Beep sound drive signal output terminal

16

SD-IN

I

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

17

UNISI

I

Serial data input from the SONY bus interface (IC800)    Used for the XR-C2300R only

18

UNISO

O

Serial data output to the SONY bus interface (IC800)    Used for the XR-C2300R only

19

UNICKO

O

Serial data transfer clock signal output to the SONY bus interface (IC800)
Used for the XR-C2300R only

20

VOL-CE

O

Chip enable signal output to the electrical volume (IC400)

21

VOL-SO

O

Serial data output to the electrical volume (IC400)

22

VOL-CKO

O

Serial data transfer clock signal output to the electrical volume (IC400)

23, 24

NC

O

Not used (open)

25

PLLSI

I

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

26

PLLSO

O

PLL serial data output to the FM/AM PLL (IC130)

27

PLLCKO

O

PLL serial data transfer clock signal output to the FM/AM PLL (IC130)

28

PLLCE

O

PLL chip enable signal output to the FM/AM PLL (IC130)    “H” active

29

ILL-ON

O

Power on/off control signal output of the illumination LED and liquid crystal display driver
(IC900)    “H”: power on

30, 31

NC

O

Not used (open)

32

NOISE-ON

O

Discharge control signal output for the noise detection circuit    “H”: discharge

33

VSS

—

Ground terminal

34

C

—

Connected to coupling capacitor for the power supply

35

AD-ON

O

A/D converter power control signal output terminal
When the KEYACK (pin uh) that controls reference voltage power for key A/D conversion input
is active, “L” is output from this terminal to enable the input