yaesu ft-991a problems

Yaesu FT-991A Problems and Possible Fixes

The Yaesu FT-991A is a highly popular all-mode transceiver among ham radio enthusiasts. Known for its versatile performance and robust features, it covers HF, VHF, and UHF bands, making it a favorite for both seasoned operators and newcomers. However, like any sophisticated piece of equipment, the FT-991A is not without its challenges. Users sometimes encounter issues that can hinder their experience and affect the radio’s performance.

In this blog post, we will explore some of the common problems that users face with the Yaesu FT-991A and provide practical solutions to fix these issues. Whether you’re dealing with audio distortion, loss of transmit power, display issues, GPS failures, overheating, or firmware update problems, we’ve got you covered.

Here are the main problems we will discuss:

  • Audio Distortion
  • Loss of Transmit Power
  • Display Issues
  • GPS and Position Reporting Failures
  • Overheating
  • Firmware Update Issues

Let’s dive into each problem and discover how to troubleshoot and resolve them effectively.

Audio Distortion


Audio distortion can significantly impair communication by making transmitted and received audio unclear or unpleasant. This problem can be frustrating during important contacts and is often reported by FT-991A users.

Possible Causes

  • Incorrect Audio Settings: Misconfigured audio settings in the transceiver can lead to distortion.
  • Faulty Microphone: A defective or incompatible microphone can cause audio issues.
  • External Interference: Electrical interference from nearby devices can distort the audio signal.


  1. Adjusting Audio Settings:
    • Navigate to the audio settings menu on the FT-991A.
    • Ensure that the mic gain and compression levels are set correctly. Avoid setting them too high, as this can cause distortion.
    • Experiment with different settings to find the optimal configuration for your setup.
  2. Testing with a Different Microphone:
    • Try using another compatible microphone to see if the issue persists.
    • If the audio improves, the original microphone may be faulty and need replacement.
  3. Checking for Interference:
    • Identify and eliminate sources of electrical interference near your radio setup.
    • Use ferrite beads on cables to reduce potential interference.

Read More: Icom 730 Review: Unbiased Analysis and Performance Report.

Loss of Transmit Power


Loss of transmit power results in weak signals that may not reach distant stations effectively. This issue is critical as it affects the overall performance of the transceiver in communication.

Possible Causes

  • Power Settings Issues: Incorrect power output settings can lead to reduced transmit power.
  • Antenna Problems: Faulty or improperly connected antennas can cause power loss.
  • Internal Component Failure: Malfunctions within the radio’s internal components may also lead to this issue.


  1. Ensuring Correct Power Settings:
    • Check the power output settings in the menu and ensure they are set to the desired level.
    • Avoid running the transceiver at maximum power for prolonged periods, as this can cause overheating and damage.
  2. Inspecting the Antenna and Coaxial Cable:
    • Verify that the antenna is correctly connected and in good condition.
    • Use an SWR meter to check for high standing wave ratios, which indicate antenna or cable issues.
  3. Professional Repair for Internal Issues:
    • If the problem persists after checking settings and the antenna, seek professional repair services to diagnose and fix internal component failures.

Read More: Icom 7300 Review Qst: Unveiling the Power

Display Issues


Display issues, such as a blank screen or flickering, can hinder the operation of the FT-991A, making it difficult to use the radio’s features effectively.

Possible Causes

  • Loose Internal Connections: Internal connections may become loose, affecting the display.
  • Firmware Issues: Outdated or corrupted firmware can cause display problems.
  • Backlight Failure: The backlight may fail, leading to a dim or unreadable screen.


  1. Checking and Securing Internal Connections:
    • Carefully open the radio (if you’re comfortable doing so) and check for any loose connections.
    • Secure any loose connectors to ensure a stable display.
  2. Updating Firmware:
    • Visit Yaesu’s official website to download the latest firmware version for the FT-991A.
    • Follow the instructions carefully to update the firmware and resolve any related issues.
  3. Replacing the Backlight:
    • If the backlight is faulty, it may need replacement. This task may require professional help to avoid further damage.

Read More: Icom 737 Review: The Ultimate Guide.

GPS and Position Reporting Failures


Issues with the built-in GPS and position reporting features can prevent the FT-991A from accurately reporting its location, which is crucial for certain modes of operation.

Possible Causes

  • GPS Settings Misconfiguration: Incorrect settings can prevent proper GPS function.
  • Poor Satellite Reception: Inadequate reception of GPS signals can cause failures.
  • Firmware Bugs: Bugs in the firmware may affect GPS functionality.


  1. Correcting GPS Settings:
    • Ensure that the GPS settings in the menu are correctly configured.
    • Refer to the user manual for detailed instructions on setting up GPS.
  2. Improving Satellite Reception:
    • Relocate the radio to an area with a clearer view of the sky to enhance GPS signal reception.
    • Avoid placing the radio near obstructions that can block satellite signals.
  3. Updating Firmware:
    • Update the firmware to the latest version to fix any bugs related to GPS and position reporting.

Read More: Icom 756 Pro 2 Review: The Ultimate Guide for Radio Enthusiasts!



Overheating can degrade the performance and shorten the lifespan of the FT-991A. It’s important to address overheating issues to maintain optimal operation.

Possible Causes

  • Poor Ventilation: Inadequate airflow around the radio can cause it to overheat.
  • Prolonged High-Power Operation: Continuous operation at high power levels can generate excessive heat.
  • Dust Accumulation: Dust inside the radio can block vents and cause overheating.


  1. Ensuring Adequate Ventilation:
    • Place the radio in a well-ventilated area.
    • Ensure that the vents are not obstructed and that there is enough space around the radio for airflow.
  2. Limiting High-Power Transmissions:
    • Avoid using the radio at maximum power for extended periods.
    • Take breaks during long transmission sessions to allow the radio to cool down.
  3. Regular Cleaning:
    • Periodically clean the radio to remove dust and debris.
    • Use compressed air to blow out dust from vents and internal components.

Read More: Icom 7600 Review: The Ultimate Guide to Amateur Radio Excellence

Firmware Update Issues


Firmware updates are essential for maintaining the functionality and improving the features of the FT-991A. However, issues during the update process can render the radio unusable.

Possible Causes

  • Incorrect Update Procedure: Not following the correct steps can cause update failures.
  • Compatibility Issues: Using the wrong firmware version can lead to problems.
  • Interrupted Update Process: Interruptions during the update can corrupt the firmware.


  1. Following the Correct Update Procedure:
    • Carefully read and follow the updated instructions provided by Yaesu.
    • Ensure that all steps are completed as outlined in the instructions.
  2. Ensuring Firmware Compatibility:
    • Verify that you have downloaded the correct firmware version for the FT-991A.
    • Check the version number and compatibility information before proceeding with the update.
  3. Avoiding Interruptions:
    • Ensure a stable power supply during the update process.
    • Avoid using the radio or connecting/disconnecting cables during the update.

Read More: Icom 7610 Reviews : Unbiased and In-Depth.


In this post, we’ve covered common problems with the Yaesu FT-991A and provided practical solutions to address them. By following these troubleshooting steps, you can resolve issues related to audio distortion, loss of transmit power, display problems, GPS failures, overheating, and firmware updates. Remember, if you’re unsure or uncomfortable with any of these procedures, seek professional assistance to avoid damaging your equipment.

Feel free to share your experiences and any additional tips in the comments below. Happy operating!

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