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– 103 –
Pin No.
Pin Name
I/O
Function
34
SPEANA-1
I
Spectrum analyzer drive signal input from the spectrum analyzer band-pass filter (IC603)
(for low frequency)
35
SPEANA-2
I
Spectrum analyzer drive signal input from the spectrum analyzer band-pass filter (IC603)
(for low and middle frequency)
36
SPEANA-3
I
Spectrum analyzer drive signal input from the spectrum analyzer band-pass filter (IC603)
(for middle and high frequency)
37
SPEANA-4
I
Spectrum analyzer drive signal input from the spectrum analyzer band-pass filter (IC603)
(for high frequency)
38
VASS
—
Ground terminal (for A/D conversion)
39
VAREF
I
Reference voltage (+5V) input terminal (for A/D conversion)
40
VDD
—
Power supply terminal (+5V)
41 to 53
GR1 to GR13
O
Grid drive signal output to the fluorescent indicator tube (ND601)
54 to 69
SEG1 to SEG16
O
Segment drive signal output to the fluorescent indicator tube (ND601)
70 to 72
SEG19 to SEG17
O
Segment drive signal output to the fluorescent indicator tube (ND601)
73 to 77
SEG24 to SEG20
O
Segment drive signal output to the fluorescent indicator tube (ND601)
78
VKK
—
Power supply terminal (–35V) (for fluorescent indicator tube drive)
79
LED1
O
LED drive signal output terminal (
r
REC,
P
PAUSE)
80
LED2
O
LED drive signal output terminal (PBC, PBC OFF)