MB400 Troubleshooting Guide – Midland

Why can’t I hear or transmit on my MB400?

Here are some quick troubleshooting steps:

🔧 Can’t Hear:

Check volume level
Ensure you're on the same channel and privacy code as your team
Antenna is properly attached

🔧 Can’t Transmit:

Check if the battery is fully charged
Confirm you're within range
Make sure PTT (push-to-talk) button is functioning
Verify that your radio isn’t locked or muted

How do I reset the MB400?

The MB400 doesn’t have a factory reset button, but you can restore default settings through the programming software.
Download it here:

MB400 Programming Software (ZIP)

Follow the programming instructions to revert to factory channel settings.

The charger is not functioning.

1. Make sure the contacts are clean and there are no obstructions between the battery contacts and the charge base contacts.

2. Make sure the charger is plugged in and has power to the AC outlet.

I don't see my frequency listed in the channel bank.

Do you have a FCC licensed frequency outside of the Business and Industrial Pool? If so, send an email to support@midlandusa.com with your programming information, and we can send you back a data file to program your radio with.

My MB400 does not work with my other radios.

1. If the other radio is not a UHF business band radio, they will not be compatible.

2. If it is another UHF business radio, the MB400 will need to be programmed to work with your existing radios. If you know the frequency and codes your radios are programmed to, you can do this yourself with a programming cable and by using Midland's downloadable programming software. If you do not know the frequency and code of your existing radios, please send an email to support@midlandusa.com for assistance.

The programming data will not transfer to the radio from the computer. I keep getting an error code when I click "start".

1. Make sure the programming cable is correctly installed between the radio and computer. Unplug and re-install the cable, or replace it if necessary.

2. Make sure the radio has a charged battery and is turned on. (Do not program a radio while in the charger!)

3. Check your COM port. It should be using COM3, but your computer may be set up differently and you may need to try a different COM port.

4. Install a USB to Serial Port conversion driver. The programming cable includes this driver and should automatically install on your computer the first time you use it. You can install a standard driver, if necessary, here.

The programming software will not install or run on my computer.

1. Make sure your computer meets the minimum requirements.

2. The programming software will not work on an Apple (Mac) computer. You will need to us a Windows PC.

3. Uninstall and re-install the program.

4. Check with your IT administrator.

I am not sure what to use for a certain setting.

When in doubt, use the default value.