D/A Convertor Ic; I/O Expander Ic - Icom IC-V8000 Service Manual

4-5-2 D/A CONVERTOR IC (MAIN UNIT: IC5)
Pin Port
number name
Outputs transmit devetion control sig-
2 MOD
nal.
3 SQLATT Outputs attenuator control signal.
• Outputs tunable bandpass filter con-
trol signal while receiving.
10 T1
• Outputs TX power control signal
while transmitting.
Output tunable bandpass filter control
11, 23 T2, T3
signals.
14 SQLIN Outputs squelch control signal.
Outputs DTCS's gradient control sig-
15 DTC
nal.
Outputs reference frequency control
22 FC
signal to X1.
4-5-3 I/O EXPANDER IC (MAIN UNIT: IC2)
Pin Port
number name
Outputs cooling fan control signal.
The fan speed is depended as shown
below.
4 FANC1
7 FANC
Fan speed
12 FANC2
Middle
Low
Outputs AF mute circuit control signal.
6 AFMUTE
High : While AF mute is ON.
Outputs TX and RX VCO's regulator
control signals.
11 SHIFT
High : While receiving.
Low : While transmitting.
Outputs R5 regulator control signal.
13 RXC
Low : While receiving.
Outputs TX power control signal.
14 TXC
High : While transmitting.
Description
Description
FANC FANC1 FANC2
Hi H H
H L
H H
H
H
L
4 - 5