Icom IC-F7000 service manual Output Expander IC for Bandpass FIL- Ters Main Unit IC3604

4-6-4 OUTPUT EXPANDER IC FOR BANDPASS FIL- TERS (MAIN UNIT; IC3604)

Pin	Port	Description
number	name
4	B0S	Outputs 0.5–1.999999 MHz bandpass
		filter control signal.
5	B1S	Outputs 2–2.999999 MHz bandpass
		filter control signal.
6	B2S	Outputs 3–4.999999 MHz bandpass
		filter control singnal.
7	B3S	Outputs 5–6.999999 MHz bandpass
		filter control signal.
11	B7S	Outputs 18–23.999999 MHz band-
		pass filter control signal.
12	B6S	Outputs 14–17.999999 MHz band-
		pass filter control signal.
13	B5S	Outputs 10–13.999999 MHz band-
		pass filter control signal.
14	B4S	Outputs 7–9.999999 MHz bandpass
		filter control signal.

4-6-5 OUTPUT EXPANDER IC (MAIN UNIT; IC3603)

Pin	Port	Description
number	name
4	NMS	Outputs NBDP MOD control signal for
		the gate mod IC (IC2001, pin 10).
5	EMS	Outputs external MOD control signal
		for the gate mode IC (IC2001, pin 11).
		Outputs microphone MOD control sig-
6	MMS	nal for the gate mode IC (IC2001, pin
		9).
11	NMR	Outputs NMEA/RS-232C switching
		signal.
13	AFMS	Outputs AF mute control signal.
14	CSEN	Outputs SEND control signal for the
		buffer amplifier (IC1303, pin 6).

4-6-6 D/A CONVERTER IC (MAIN UNIT; IC3606)

Pin	Port	Description
number	name
		Outputs transmit power control signal.
5	POCV	The signal is applied to the ALC ampli-
		fier (IC1201, pin 3) and RF amplifier
		(Q701).
		Outputs the cooling fan control signal.
11	FANS	The signal is applied to the fan con-
		troller (PA unit; IC6501, Q6501).
		Outputs the transmitter/receiver
13	TRXS	switching signal. The signal is applied
		to the switching relay circuit (PLL unit;
		RL7301).

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