MDX-C8970R - Sony Car Audio Service Manual (repair manual). Page 59

59

Pin No.

Pin Name

I/O

Description

32

NARROW

O

33

VSS

—

Ground terminal

34

C

—

Connected to coupling capacitor for the power supply

35

RAMBU

I

Internal RAM reset detection signal input terminal
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset    Not used (open)

36

MUTE

O

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

37

AUDIO SEL0

O

Analog signal source selection output to the CXD2727Q (IC300)

38

DVCC

—

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

39

DVSS

—

Ground terminal (for D/A converter)

40

AUDIO SEL1

O

Analog signal source selection output to the CXD2727Q (IC300)

41

LCDANG

O

View field angle control signal is output when front panel is fully opened
“H”: front panel is fully opened

42

AVCC

—

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

43

AVRH

I

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

44

AVRL

I

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

45

AVSS

—

Ground terminal (for A/D converter)

46

VSM

(S-METER)

I

FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU101)
(A/D input)

47

KEY-IN0

I

Key input terminal (A/D input) (LSW900, S900, LSW901 to LSW904, LSW906)
OFF, SEEK/AMS 

+ ) +  = 0 – , SOURCE, SHIFT, MODE, SOUND, DSPL keys 

input

48

KEY-IN1

I

Key input terminal (A/D input) (LSW902, LSW905, LSW907 to LSW918)
6, LIST, PTY, AF/TA, TIR, 10 to 3 keys input

49

RC-IN0

I

Rotary remote commander key input terminal (A/D input)

50

DSTSEL0

I

Destination setting terminal (fixed at “L”)

51

DSTSEL1

I

Destination setting terminal (fixed at “H”)

52

QUALITY

I

Noise level detection signal input at SEEK mode

53

MTP

I

Multi-path detection signal input from the RDS decoder (IC901)

54

VCC

—

Power supply terminal (+5V)

55

VOL LOAD

O

Serial data latch pulse output to the electrical volume (IC602, IC632)

56

VOL DATA L

O

Setting data output (L-ch) to the electrical volume (IC602)

57

VOL DATA R

O

Setting data output (R-ch) to the electrical volume (IC632)

58

VOL CLK

O

Serial clock signal output to the electrical volume (IC602, IC632)

59

DSP XLAT

O

Serial data latch pulse signal output to the CXD2727Q (IC300)

60

RC-IN1

I

Rotary remote commander shift key input terminal    “L”: shift

61

ACC IN

I

Accessory detect signal input terminal    “L”: accessory on

62

POW-ON

O

Main system power supply on/off control signal output    “H”: power on

63

VSS

—

Ground terminal

64

BOOT

O

Serial data output to the liquid crystal display drive controller (IC701)
“L” is output when writing change

65

PWM IN

I

Power supply control signal input from the power control (IC871)

66

NCO

O

Not used (open)

67

RDS-DAVN

I

Data transmit completed detect signal input from the RDS decoder (IC901)   “H”: active

68

CD/MD

I

Setting for the internal mechanism CD or MD
“L”: CD, “H”: MD (fixed at “H” in this set)

IF band select signal output to the FM/AM tuner unit (TU101)    “H”: narrow mode
In receiving FM signals, interference noise from adjacent stations is removed by narrowing the 
IF band automatically in the tuner unit so as to raise the selectivity