Icom IC-M802 Service Manual page 16

3-7-4 OUTPUT EXPANDER IC FOR BANDPASS FIL-
TERS (IC3604)
Pin Port
number name
Outputs 0.5–1.999999 MHz bandpass
4 B0S
filter control signal.
Outputs 2–2.999999 MHz bandpass
5 B1S
filter control signal.
Outputs 3–4.999999 MHz bandpass
6 B2S
filter control singnal.
Outputs 5–6.999999 MHz bandpass
7 B3S
filter control signal.
Outputs 18–23.999999 MHz band-
11 B7S
pass filter control signal.
Outputs 14–17.999999 MHz band-
12 B6S
pass filter control signal.
Outputs 10–13.999999 MHz band-
13 B5S
pass filter control signal.
Outputs 7–9.999999 MHz bandpass
14 B4S
filter control signal.
3-7-5 OUTPUT EXPANDER IC (IC3603)
Pin Port
number name
Outputs NBDP MOD control signal for
4 NMS
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).
Outputs NMEA/RS-232C switching
11 NMRS
singnal.
13 AFMS Outputs AF mute control signal.
Outputs SEND control signal for the
14 CSEN
buffer amplifier (IC1303, pin 6).
3-7-6 OUTPUT EXPANDER IC (IC3605)
Pin Port
number name
Outputs 24–30 MHz bandpass filter
4 B8S
control signal.
Outputs bandpass filter control signal
5 DBP1 for DSC circuit (For 2.1875, 4.2075,
6.3120 MHz).
Outputs bandpass filter control signal
6 DBP2
for the DSC circuit (8.4145 MHz).
Outputs bandpass filter control signal
7 DBP3
for the DSC circuit (12.5770 MHz).
Outputs bandpass filter control signal
14 DBP4
for the DSC circuit (16.8045 MHz).
Description
Description
Description
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3-7-7 D/A CONVERTER IC (IC3606)
Pin Port
number name
Outputs transmit power control signal.
The signal is applied to the ALC ampli-
5 POCV
fier (IC1201, pin 3) and RF amplifier
(Q701).
Outputs the VCA control signal. The
signal is applied to the VCA amplifier
6 AFG
(IC1603, pin 8) and RC-25 controller
via the J2051, pin 5.
Outputs the cooling fan control signal.
11 FANS The signal is applied to the fan con-
troller (PA unit; IC6501, Q6501).
Outputs
switching signal. The signal is applied
13 TRXS
to the switching relay circuit (FILTER
unit; RL7301).
Description
the transmitter/receiver