Read Sony XR-1900 Service Manual online
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Pin No.
Pin Name
I/O
Function
53
LCD-CLK
O
Serial data transfer clock signal output to the liquid crystal display driver (IC900)
54
LCD-CE
O
Chip enable signal output to the liquid crystal display driver (IC900) “H” active
55
LCD-DATA
O
Serial data output to the liquid crystal display driver (IC900) “H” active
56
AM-ON
O
AM system power supply on/off control signal output terminal “H”: AM on
57
MONO
O
Not used (open)
58 to 60
—
O
Not used (open)
61
FM-ON
O
FM system power supply on/off control signal output terminal “H”: FM on
62
TUNER-ON
O
Tuner system power supply on/off control signal output terminal “H”: tuner on
Not used (open)
Not used (open)
63
MW/LW
O
MW/LW selection signal output terminal “L”: MW, “H”: LW Not used (open)
64, 65
—
O
Not used (open)
66
NC
I
Not used (fixed at “L”)
67
CE
I
Accessory switch on/off detection signal input terminal
“H”: accessory on, “L”: accessory off (hold mode)
“H”: accessory on, “L”: accessory off (hold mode)
68
RESET
I
System reset signal input terminal “L”: reset
69
KEY-IN
I
Key matrix return signal input terminal (A/D input)
70
IFIN
I
FM and AM intermediate frequency detection signal input from the FM/AM tuner unit (TU100)
71
NC
I
Not used (fixed at “L”)
72
BU-CHECK
I
Battery detect signal input terminal
73
VDD
—
Power supply terminal (+5V)
74
FMIN
I
FM local oscillator input from the FM/AM tuner unit (TU100)
75
AMIN
I
AM local oscillator input from the FM/AM tuner unit (TU100)
76
VSS
—
Ground terminal
77
EO
O
Main charge-pump control signal output terminal
78
—
O
Not used (open)
79
TEST1
I
Connected to ground
80
XOUT
O
System clock output terminal (4.5 MHz)
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