Sony MDX-C8970, Руководство по обслуживанию

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57
Pin No. Pin Name I/O Description
74 X0A I
Sub system clock input terminal (32.768 kHz)
75 NCO O
Not used (open)
76 KEYACK
I
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function
and eject keys in the power off status On at input of “H”
77 BU-IN
I
Battery detect signal input from the SONY bus interface (IC271) and battery detect circuit
“L” is input at low voltage
78 SP LATCH
O
Serial data latch pulse output for spectrum analyzer section to the liquid display drive controller
(IC701)
79 DSP REDY
I
Transfer enable signal output from the liquid crystal display drive controller (IC701)
“L”: transfer prohibition, “H”: transfer permission
80 TEST
I Setting terminal for the test mode “L”: test mode, Normally: fixed at “H”
81 EMPH
O Emphasis control signal output to the MD mechanism controller (IC501)
82 WAKE UP
O DC/DC converter power supply on/off control signal output terminal Not used (open)
83
TEL-MUTE I Telephone muting signal input terminal At input of “L”, the signal is attenuated by –20 dB
84
TU-ON O Tuner system power supply on/off control signal output “H”: tuner power on
85 ILL IN
I
Auto dimmer control illumination line detection signal input terminal
“L” is input at dimmer detection
86 HSTX I
Hardware standby input terminal “L”: hardware standby mode Reset signal input in this set
87 MD2 I
Setting terminal for the CPU operational mode (fixed at “L” in this set)
88 MD0 I
Setting terminal for the CPU operational mode (fixed at “H” in this set)
89 MD1 I
Setting terminal for the CPU operational mode (fixed at “H” in this set)
90 RESET I
System reset signal input from the reset signal generator (IC506) and reset switch (S703)
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
91 VSS —
Ground terminal
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 DOOR-IND
O
LED drive signal output of the illumination LED (LED706) “H”: LED on
“H” is output to turn on LED when front panel is opened
96 DSP ON
O Power supply on/off control signal output for the CXD2727Q (IC300) “H”: DSP on
97 NCO O
Not used (open)
98 AMP STBY O
Standby on/off control signal output to the power amplifier (IC481)
“L”: standby mode, “H”: amp on
99 to 106 NCO O
Not used (open)
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 NCO O Not used (open)