Icom IC-756PROII Service Manual page 19

(4) CTRL board; IC11
Pin Port
number name
Outputs a low-pass filter select signal.
4 L1S High: When
Outputs a low-pass filter select signal.
L2S High: When 2.0–5.999999 MHz band
5
Outputs a low-pass filter select signal.
6 L3S High: When 6.0–7.999999 MHz band
Outputs a low-pass filter select signal.
7 L4S High: When
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.
12 L7S High: When 22.0–29.999999 MHz
Outputs a low-pass filter select signal.
13 L6S High: When 15.0–21.999999 MHz
Outputs a low-pass filter select signal.
L5S High: When 12.0–14.999999 MHz
14
(5) RF-A unit; IC901
Pin Port
number name
Outputs a bandpass filter select signal.
4 B0S High: When
Outputs a bandpass filter select signal.
5 B1S High: When 1.6–1.999999 MHz band
Outputs a bandpass filter select signal.
6 B2S High: When 2.0–2.999999 MHz band
Outputs a bandpass filter select signal.
7 B3S High: When 3.0–3.999999 MHz band
Outputs a bandpass filter select signal.
B6S High: When
11
Outputs a bandpass filter select signal.
12 B5S High: When 7.0–7.299999 MHz band
Outputs a bandpass filter select signal.
13 B5WS High : When 6.0–6.999999 MHz or 7.3–
Outputs a bandpass filter select signal.
B4S High: When 4.0–5.999999 MHz band
14
Description
0.03–1.999999
band is selected.
is selected.
is selected.
8.0–11.999999
band is selected.
selected.
band is selected.
band is selected.
band is selected.
Description
0.03–1.599999
band is selected.
is selected.
is selected.
is selected.
8.0–10.999999
band is selected.
is selected.
7.999999 MHz band is selected.
is selected.
(6) RF-A unit; IC902
Pin Port
number name
MHz
4 B7WS
5 B7S
6 B8WS
MHz
B8W
7
12 B10S
13 B10WS
14 B9S
(7) RF-A unit; IC905
Pin Port
number name
MHz 4 AT1S
5 AT2S
6 PR1S
7 PR2S
RANS
14
MHz
3 - 13
Description
Outputs a low-pass filter select signal.
High: When 11–13.999999 MHz or
14.5–14.999999 MHz band is
selected.
Outputs a low-pass filter select signal.
High: When 14.0–14.499999 MHz
band is selected.
Outputs a low-pass filter select signal.
High: When 15.0–20.999999 MHz or
21.5–21.999999 MHz band is
selected.
Outputs a low-pass filter select signal.
High: When 21.0–21.499999 MHz
band is selected.
Outputs a low-pass filter select signal.
High: When 50.0–54.0 MHz band is
selected.
Outputs a low-pass filter select signal.
High: When 30.0–49.999999 MHz or
54.000001–60.0 MHz band is
selected.
Outputs a low-pass filter select signal.
High: When 22.0–29.999999 MHz
band is selected.
Description
Outputs control signal for the attenua-
tor circuit (RL121, R121, R122).
Low : When 6 dB attenuator is ON
Outputs control signal for the attenua-
tor circuit (RL122, R123, R124).
Low : When 12 dB attenuator is ON
Outputs control signal for the pre-
amplifier 1 circuit (Q441, Q442).
High: When P.AMP 1 is selected.
Outputs control signal for the pre-
amplifier 2 circuit (IC451).
High: When P.AMP 2 is selected.
Outputs the RX antenna select signal.
Low : When [RX ANT] is selected.