Sony Walkman D-E777 Service Manual page 10

D-E777/EJ721/EJ725
Pin No. Pin name
41 BATDET
42 XHGOM
43 XLAT
44 XSOE
45 RESERVE
46 XPOWLT
47 XDOUTON
48 XAPC OFF
49 RESERVE
50 to 64 SEG14 to SEG0
65 to 68 COM3 to COM0
69 to 71 V3 to V1
72, 73 C1, C0
74 STOP
75 TEST
76 VOL LT
77 BACKLIGHT
78 RESET
79 XIN
80 XOUT
10
I/O
I Battery detection input.
O Optical pick-up power ON/OFF control signal output terminal.
O Serial data latch pulse signal output to IC601.
O Serial data output enable signal output terminal.
— Not used (OPEN).
O Latch signal output to the power control (IC401).
O Digital out ON/OFF signal output.
O APC mute signal output terminal. "L": mute
— Not used (open).
O Segment drive signal output to the liquid crystal display.
O Common drive signal output to the liquid crystal display.
O Bias signal output to the liquid crystal display driver.
O Capacitor connected terminal for the liquid crystal display driver voltage-up.
O VCD control stop signal output terminal. Not used (Fixed at "L").
I Test terminal for IC (Fixed at "L").
O VCC2 voltage control signal output terminal.
— Not used (open).
System reset signal input from the power control (IC401). "L": reset
I For several hundreds msec. after the power supply rises, "L" is input, then it changes to
"H"
I System clock input terminal.
— Not used (OPEN).
Description
"L": ON