How to unlock the channel on my Icom IC-M73 Transceiver?
- FFrancisco GarciaAug 21, 2025
If you can't change the displayed channel on your Icom Transceiver, the lock function may be activated. Push [H/L•LOCK] for 1 second to cancel the lock function.

How to unlock the channel on my Icom IC-M73 Transceiver?
If you can't change the displayed channel on your Icom Transceiver, the lock function may be activated. Push [H/L•LOCK] for 1 second to cancel the lock function.
Why is there no sound coming from my Icom IC-M73 speaker?
If you're not getting any sound from your Icom Transceiver speaker, there could be several reasons. The squelch level might be set too high; try adjusting it to the threshold point. Also, check the volume level and increase it if it's too low by rotating [VOL]. If the speaker got wet, hold down [F] to drain any water. Finally, ensure the [SP MIC] connector is dry, as water inside can also cause this issue.
Why is the weak signal not recorded by the automatic recording function on my Icom IC-M73?
If the automatic recording function isn't picking up weak signals, the automatic recording threshold level might be set too deep. Try setting it to a shallower level.
Why is my Icom IC-M73 Transceiver not beeping?
If you're not hearing any beeps from your Icom Transceiver, the beep tones may be turned off. You can turn them back on by setting the beep tones to ON (Fix Beep/Preset) in the SET mode.
Why doesn't the scan start on my Icom IC-M73?
If the scan function isn't starting, it's possible that no favorite (TAG) channels are programmed. Set the channels you want to scan as “Favorite (TAG)” channels.
Why can't I transmit or select high power on my Icom IC-M73?
Several factors could be preventing transmission or high power selection. Some channels are designated for low power or receive-only, so try changing channels. The battery might be exhausted, requiring a recharge. An overcharged battery can also cause this issue, so verify the battery voltage. Ensure the output power isn't set to low by pressing [H/L•LOCK] to select high power. Finally, if the transceiver is overheated, turn it off and let it cool down at room temperature.
What to do if my Icom IC-M73 does not turn ON?
If your transceiver isn't turning on, the battery might be depleted. Try recharging the battery pack. Also, check the connection to the battery pack to ensure it's properly connected to the transceiver.
Why is there no sound from my Icom IC-M73 Transceiver speaker?
There could be several reasons for this. The squelch level might be too tight, so try setting the squelch to the threshold point. The volume level could also be too low; rotate the [VOL] control to adjust it. If the speaker has been exposed to water, hold down [F] to drain it. Also, check the [SP MIC] connector for water and dry it if necessary.
How to unlock the channel change on my Icom IC-M73?
If the displayed channel cannot be changed on your Icom Transceiver, the lock function may be activated. Push [H/L•LOCK] for 1 second to cancel the function.
What to do if the displayed channel cannot be changed on Icom Transceiver?
If you cannot change the displayed channel on your Icom Transceiver, the lock function may be activated. To deactivate it, push ;(,s,/#+= for 1 second.
| Purpose | Marine Radio Service |
|---|---|
| Operating frequency | 156.025 - 157.425 MHz |
| Antenna connector type | FA-S64V |
| Number of antenna connectors | 1 |
| Battery type | BP-254N |
| Battery low indication | Yes |
| Product color | Black |
| Waterproof up to | 1 m |
| Operating temperature (T-T) | -20 - 60 °C |
| Number of batteries included | 1 pc(s) |
| Depth | 30 mm |
|---|---|
| Width | 52.5 mm |
| Height | 125 mm |
| Weight | 320 g |
Covers severe risks including death, injury, fire, and explosion hazards.
Provides advice on usage, environment, cleaning, and modifications.
Outlines FCC and IC requirements for safe RF exposure during transmission.
Explains the transceiver's compliance with FCC rules for Class A unintentional radiators.
Step-by-step instructions for making an emergency call using Channel 16.
Locates and names buttons, keys, microphone, and speaker.
Explains functions of remaining buttons and describes SP MIC/Antenna connectors.
Details on channel number readout, battery icon, and primary status indicators.
Explains icons for ATIS, Call Channel, Weather, Power, and Busy status.
How to select operating channels and use the designated call channel.
Guide to choosing appropriate channel groups for different regions.
Steps for sending and receiving signals, including power settings.
Explains normal and priority scan modes for signal detection.
How to mark channels and begin scanning sequences.
Describes how Dualwatch and Tri-watch monitor channels.
Covers hazards like fire, explosion, and chemical exposure.
Important safety rules for the battery charging process.
A table listing issues, possible causes, and solutions.
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