MDX-C8970R - Sony Car Audio Service Manual (repair manual). Page 61

61

Pin No.

Pin Name

I/O

Description

107

AD-ON

O

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

108

NCO

O

Not used (open)

109

NOSE-SW

I

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

110

CSV REQ

I

Serial data transfer request input from the CSV (IC801)

111

CSV CE

O

Chip enable signal output to the CSV (IC801)   “H”: active

112

CSV RST

O

Reset signal output to the CSV (IC801) and flash memory (IC805)   “L”: reset

113

NCO

O

Not used (open)

114

FM-ON

O

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

115

DOOR-SW

I

Front panel open/close detection signal input    “L” is input when the front panel is closed

116

NS-MASK

O

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

117

SEEK

O

Seek control signal output to the FM/AM tuner unit (TU101)
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

118

AF MUTE

O

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

119

VSS

—

Ground terminal

120

SSTOP

I

IF counter request signal input from the FM/AM PLL (IC151)