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4
5
6
7
11
12
13
14
LEDR
LEDT
LIGT
AFON
DUSE
MCON
CSFT
SPON
Outputs RX LED control signal.
Low: Lights ON.
Outputs TX LED control signal.
Low: Lights ON.
Outputs back light LED control signal.
Low: Back light is ON.
Outputs audio control signal.
Low: Outputs audio signals from
speaker.
• Outputs CTCSS/DTCS switching sig-
nal when transmitting.
High: Selected DTCS.
• Outputs Min. VR switching signal
when receiving.
Low: Select Min VR.
NOTE: Audio signals are prior to
transmitting.
Outputs microphone select signal.
High: While the internal microphone
is used.
Outputs shift signal for reference oscil-
lator’s frequency.
Outputs the internal speaker control
signal.
High: The internal speaker is select-
ed.
Pin Port
Description
number name
4-6-3 EXPANDER IC (FRONT UNIT; IC410)
4
5
6
7
11
12
13
14
R5C
T5C
LIGT
AFON
MUT2
MUT1
PMFM
TMUT
Outputs the R5 regulator (Q22) control
signal.
Low: While receiving.
Outputs the T5 regulator (Q21) control
signal.
Low: While transmitting.
Outputs the S5 regulator (Q23–Q25)
control signal.
Low: While the S5 regulator outputs
5 V voltage.
Outputs audio control signal.
Low: Outputs audio signals from
speaker.
Outputs the analog switch (IC13, pins
5, 6) control signal to control the
scrambler unit.
High: While the scrambler function is
ON.
Low: While the microphone mute or
AF mute is ON.
Outputs the analog switch (IC13, pins
12, 13) control signal to control the
scrambler unit.
High: While the scrambler function is
ON.
Low: While the microphone mute or
AF mute is ON.
Outputs the FM/PM modulation
switching signal to the FM/PM switch
(IC11, pin 5).
High: PM is selected.
Outputs the transmitting mute switch
control signal to the mute switch
(D25).
High: While muting.
Pin Port
Description
number name
4-6-5 EXPANDER IC (MAIN UNIT; IC12)
11
14
15
22
23
BAL
T2
T1
LVA
REF
Outputs the modulation balance level
control signal. The signal is applied to
the buffer amplifier (IC16, pin 2).
• Outputs the bandpass filter tuning
signal. The output signal is applied to
the bandpass filters (D9, D10).
• Outputs the TX power control signal.
The output signal is applied to the
APC amplifier (IC2, pin 1).
Outputs the bandpass filter tuning sig-
nal. The output signal is applied to the
bandpass filters (D4, D8).
Outputs the PLL lock voltage control
signal. The output signal is applied to
the buffer amplifier (IC16, pin 5).
Outputs the reference oscillator cor-
recting voltage. The voltage is applied
to the buffer amplifier (IC16, pin 3).
Pin Port
Description
number name
4-6-4 D/A CONVERTER IC (MAIN UNIT; IC6)