MDX-C7890R - Sony Car Audio Service Manual (repair manual). Page 32

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92

X0

I

Main system clock input terminal (3.68 MHz)

93

X1

O

Main system clock output terminal (3.68 MHz)

94

VCC

—

Power supply terminal (+5V)

95

PW SEL

I

Power select switch (S700) input terminal    “L”: on (operation mode), “H”: off (halt mode)

96

POL MONO

I

Polar monaural detection signal input terminal    Not used (open)

97 to 99

NC

O

Not used (open)

100

BAND

(9K-10K)

I

Frequency select input terminal    Not used (fixed at “H”)

101

NC

O

Not used (open)

102

RAMBU

I

103

NC

O

Not used (open)

104

LCD CE

O

Chip enable output to the liquid crystal display driver (IC801)

105

FLASH W

I

Fixed at “H” in this set

106

REIN0

I

Rotary encoder (EN801) input for volume/bass/treble/balance/fader control

107

REIN1

I

Rotary encoder (EN801) input for volume/bass/treble/balance/fader control

108

LAMP ON

(ILL ON)

O

109

PW ON

O

Main system power supply on/off control signal output to the BA3918 (IC800)    “H”: power on

110

FM ON

O

FM system power supply on/off control signal output to the BA3918 (IC800)    “H”: FM on

111

TUN ON

O

Tuner system power supply on/off control signal output to the BA3918 (IC800)    “H”: tuner on

112 to 118

NC

O

Not used (open)

119

VSS

—

Ground terminal

120

NC

O

Not used (open)

Internal RAM reset detection signal input from the RN5VD23AA (IC802)
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset

Power supply on/off control signal output terminal at the illumination and liquid crystal display
driver (IC801)    “H”: power on
At power select switch (S700) on mode: “H” output at the accessory on
At power select switch (S700) off mode: “H” output at the power on