Icom IC-7800 Service Manual page 27

The transcever
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Pin
Port
number
name
Input port for the driving current
119
FANI
detect signal at the cooling fan.
Input port for the external keypad on
120
EPAD
the rear panel.
Input port for the data signal from the
121
DX1A
DSP IC on the DSP-A board.
Input port for the data signal from the
122
DX1B
DSP IC on the DSP-B board.
Input port for the data signal from the
123
DX1T
DSP IC on the DSP-TX board.
Input port for the data signal from the
124
DX1S
DSP IC on the SCOPE unit.
Input port for the internal antenna
127
IKEY
tuner KEY signal.
128
SKYS
Input port for the straight key.
Outputs CW/RTTY keying signal to
135
DSKY
the DSP IC.
Outputs power control signal to the
linear circuit.
137
PWRS
High: The linear circuit is ON.
Outputs clock signal to the D/A
138
METCK
converter (IC603) for the external
meter.
Outputs clock signal to the D/A
140
METLR
converter (IC603) for the external
meter.
Outputs data signal to the D/A
142
METDT
converter (IC603) for the external
meter.
Description
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