Sony MDX-M690, Service Manual

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MDX-M690
Pin No. Pin Name I/O Description
69 LCDINH O
Blank indicate control signal output to the liquid crystal display driver (IC1, 60, 61)
“L”: no display
70 LCDCE1
O Chip enable signal output to the liquid crystal display driver (IC61) “H”: active
71 LCDCE2
O Chip enable signal output to the liquid crystal display driver (IC1) “H”: active
72 to 78 NCO
O Not used (open)
79 FL_W O
Flash memory data write control signal output terminal “H”: active
80 FWE (L) I
Flash memory data write enable signal input terminal
81 SYSRES I
System reset signal input from the reset signal generator (IC502)
“L” is input for several 100 msec after power on, then it changes to “H”
82 NMI (H)
I Non maskable interrupt input terminal fixed at “H”
83 STBY (H)
I Hard ware standby input terminal fixed at “H”
84 VCC —
Power supply terminal (+5V)
85 XTAL
O System clock output terminal (18.432 MHz)
86 EXTAL
I System clock input terminal (18.432 MHz)
87 VSS —
Ground terminal
88 NCO
O Not used (open)
89 VCC —
Power supply terminal (+5V)
90 to 96 NCO
O Not used (open)
97 UNI-SO O
Serial data output to the SONY bus interface (IC601)
98 UNI-SI I
Serial data input from the SONY bus interface (IC601)
99, 100 VSS —
Ground terminal
101 UNI-SCK I/O
Serial clock signal input /output with the MD mechanism controller (IC501) and system
controller (IC501) or serial clock signal output to the SONY bus interface (IC601)
102 NCO
O Not used (open)
103 AVCC —
Power supply terminal (+5V) (for A/D converter)
104 VREF I
Reference voltage (+5V) input terminal (for A/D converter)
105 to 111
NIL
I
Not used (fixed at “L”)
112 SA-IN
I Spectrum analyzer display serial data input from the TDA7406T (IC305)
113 AVSS —
Ground terminal (for A/D converter)
114 VSS —
Ground terminal
115 to 122 NCO
O Not used (open)
123 MD0 (H) I
Setting terminal for the CPU operational mode (fixed at “H” in this set)
124 MD1 (H) I
Setting terminal for the CPU operational mode (fixed at “H” in this set)
125 MD2 (H) I
Setting terminal for the CPU operational mode (fixed at “H” in this set)
126 to 128 NCO
O Not used (open)