Icom IC-756PRO III Service Manual page 19

(4) CTRL-A board; IC11
Pin Port
number name
Outputs a low-pass filter select signal.
L1S High : When 0.03–1.999999 MHz
4
Outputs a low-pass filter select signal.
L2S High : When 2.0–4.999999 MHz band
5
Outputs a low-pass filter select signal.
L3S High : When 5.0–7.999999 MHz band
6
Outputs a low-pass filter select signal.
L4S High : When 8.0–11.999999 MHz
7
Outputs a low-pass filter select signal.
L8S High : When 30.0–60.0 MHz band is
11
Outputs a low-pass filter select signal.
L7S High : When 22.0–29.999999 MHz
12
Outputs a low-pass filter select signal.
L6S High : When 15.0–21.999999 MHz
13
Outputs a low-pass filter select signal.
L5S High : When 12.0–14.999999 MHz
14
(5) RF-B unit; IC401
Pin Port
number name
Outputs a bandpass filter select signal.
4 B0S High : When 0.03–1.599999 MHz is
Outputs a bandpass filter select signal.
5 B1S High : When 1.6–1.999999 MHz is
Outputs a bandpass filter select signal.
6 B2S High : When 2.0–2.999999 MHz is
Outputs a bandpass filter select signal.
7 B3S High : When 3.0–3.999999 MHz is
Outputs a bandpass filter select signal.
11 B6S High : When 8.0–10.999999 MHz is
Outputs a bandpass filter select signal.
12 B5S High : When 7.0–7.299999 MHz is
Outputs a bandpass filter select signal.
High : When 6.0–6.999999 MHz or
13 B5WS
Outputs a bandpass filter select signal.
14 B4S High : When 4.0–5.999999 MHz is
Description
band is selected.
is selected.
is selected.
band is selected.
selected.
band is selected.
band is selected.
band is selected.
Description
selected.
selected.
selected.
selected.
selected.
selected.
7.3–7.999999 MHz band is
selected.
selected.
(6) RF-B unit; IC402
Pin Port
number name
4 B7WS
5 B7S
6 B8WS
7 B8W
12 B10S
13 B10WS
14 B9S
(7) RF-B unit; IC403
Pin Port
number name
4 AT1S
5 AT2S
6 PR1S
7 PR2S
14 RANS
3 - 13
Description
Outputs a bandpass filter select signal.
High : When 11–13.999999 MHz or
14.5–14.999999 MHz band is
selected.
Outputs a bandpass filter select signal.
High : When 14.0–14.499999 MHz is
selected.
Outputs a bandpass filter select signal.
High : When 15.0–20.999999 MHz or
21.5–21.999999 MHz band is
selected.
Outputs a bandpass filter select signal.
High : When 21.0–21.499999 MHz is
selected.
Outputs a bandpass filter select signal.
High : When 50.0–54.0 MHz is select-
ed.
Outputs a bandpass filter select signal.
High : When 30.0–49.999999 MHz or
54.000001 MHz band is select-
ed.
Outputs a bandpass filter select signal.
High : When 22–29.999999 MHz is
selected.
Description
Outputs control signal for the
attenuator circuit (RL102, R102,
R106, R111).
Low : When 6 dB attenuator is ON.
Outputs control signal for the
attenuator circuit (RL103, R112,
R113, R114).
Low : When 12 dB attenuator is ON.
Outputs control signal for the pre-
amplifier (PRE-AMP board; Q4201,
Q4202).
High : When P.AMP 1 is ON.
Outputs control signal for the pre-
amplifier (PRE-AMP board; Q4302).
High : When P.AMP 2 is ON.
Output the RX antenna select
signal.
High : When RX antenna is selected.