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