Icom IC-7800, Service Manual Addendum

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3-7-9 RELAY CONTROLLER (BPF UNIT; IC102)
6 HF50A
Outputs the RX-A circuit bandpass fil-
ter group select signal.
Low : While receiving on 30–60 MHz.
7 AT12A
Outputs the RX-A circuit 12 dB atten-
uator control signal.
High : The 12 dB attenuator is ON.
8 AT6A
Outputs the RX-A circuit 6 dB attenu-
ator control signal.
High : The 6 dB attenuator is ON.
9 AT3A
Outputs the RX-A circuit 3 dB attenu-
ator control signal.
High : The 3 dB attenuator is ON.
11 DWSPA
Outputs the RX-A circuit split function
control signal.
Low : The split function is ON.
12 RMUTA
Outputs the RX-A circuit mute control
signal.
Low : While the RX-A circuit is muting.
13 TRVS
Outputs the transverter’s receiver cir-
cuit control signal.
High : The transverter is ON.
14 RSELA
Outputs receive antenna ([ANT 4])
select signal.
Low : [ANT 4] is selected.
16 VPR2A
Outputs the RX-A circuit 50 MHz pre-
amplifier 2 control signal.
Low : The pre-amplifier 2 is ON.
17 VDWA
Outputs the RX-A circuit 50 MHz cor-
rection amplifier control signal.
Low : The pre-amplifier 2 is ON
(Receive 50 MHz band).
Pin Port
Description
number name
3-7-10 RELAY CONTROLLER (BPF UNIT; IC401)
6 B0B
Outputs the RX-B circuit bandpass fil-
ter (0.03–1.6 MHz) select signal.
7 B1B
Outputs the RX-B circuit bandpass fil-
ter (1.6–2 MHz) select signal.
8 B2B
Outputs the RX-B circuit bandpass fil-
ter (2–3 MHz) select signal.
9 B3B
Outputs the RX-B circuit bandpass fil-
ter (3–4 MHz) select signal.
10 B4B
Outputs the RX-B circuit bandpass fil-
ter (4–6 MHz) select signal.
11 B5B
Outputs the RX-B circuit bandpass fil-
ter (6–8 MHz) select signal.
12 B6B
Outputs the RX-B circuit bandpass fil-
ter (8–11 MHz) select signal.
13 B7B
Outputs the RX-B circuit bandpass fil-
ter (11–15 MHz) select signal.
14 B8B
Outputs the RX-B circuit bandpass fil-
ter (15–22 MHz) select signal.
15 B9B
Outputs the RX-B circuit bandpass fil-
ter (22–30 MHz) select signal.
16 B10B
Outputs the RX-B circuit bandpass fil-
ter (50–54 MHz) select signal.
Outputs the RX-B circuit bandpass fil-
17 B10WB ter (30–50 MHz and 54–60 MHz)
select signal.
Pin Port
Description
number name