No sound from both sides of the earphones

both_sides_sound_none

Check the state of the earphones.
Remove the earphones from the charging case and check the status of the indicators.

The earphones are properly connected to the device.
Check the app settings and volume.

Apps and Volume Control on the Connected Device

  1. Open an app and play

    2. app_01
    app_02

  2. Adjust the volume

    3. volume_smp_1

Select the state after checking

Thank you for using Troubleshooting Guide.

Initializing the earphones and re-establishing the connection may help to solve the problem.

Follow the steps below to check whether there is any abnormality with the sound output.

Initializing

First of all, go to the Bluetooth settings of the device to be connected and delete the information of this unit that is registered on it.

Charge the charging case beforehand.

Follow the steps below to initialize the settings of both L and R earphones.

  1. Remove the L earphone from the charging case

    2. Initializing_1_A4T

    Make sure that the Bluetooth device is not connected (the indicator flashes twice every 5 seconds, or flashes quickly repeatedly).

  2. Tap the touch sensor area 3 times (for the third time, keep touching until the indicator lights up)

    3. Release your finger after the indicator lights up.

    Initializing_L_A4T_New + Initializing_L_A4T_New

    Touch sensor area

    Release your finger after the indicator lights up.

    Touch and hold

    The indicator lights up for 5 seconds.

  3. Tap the touch sensor area twice while the indicator is lighting up

    4. The indicator will flash and then go out, and the power will be turned off.

    If you do not tap the touch sensor twice while the indicator is lit, start again from step 2.

  4. Insert the L earphone into the charging case

    5. Initializing_2_A4T

  5. Remove the R earphone from the charging case

    6. Initializing_3_A4T

    Make sure that the Bluetooth device is not connected (the indicator flashes twice every 5 seconds, or flashes quickly repeatedly).

  6. Tap the touch sensor area 3 times (for the third time, keep touching until the indicator lights up)

    7. Release your finger after the indicator lights up.

    Initializing_R_A4T_New + Initializing_R_A4T_New

    Touch sensor area

    Release your finger after the indicator lights up.

    Touch and hold

    The indicator lights up for 5 seconds.

  7. Tap the touch sensor area twice while the indicator is lighting up

    8. The indicator will flash and then go out, and the power will be turned off.

    If you do not tap the touch sensor twice while the indicator is lit, start again from step 2.

  8. Insert the R earphone into the charging case

    9. Initializing_4_A4T

  9. Remove the earphones from the charging case and place them so that the L and R earphones are placed next to each other

    10. connecting_LR_1_A4T

    The L and R indicators light up and the power turns on.

    After a short while, the L indicator starts to flash quickly and repeatedly. The R indicator flashes twice every 5 seconds repeatedly.

    connecting_LR_2_A4T

Connecting to a Device

    Turn on the BLUETOOTH connection setting of the device and select “JVC HA-A4T”
    connecting_smp_1
    connecting_smp_2
    connecting_smp_3 + Device List JVC Nav

    JVC HA-A4T

    blue_flash_A4T

    The earphones are connected to the device if the indicators on both sides of the earphones are flashing every 5 seconds.

Apps and Volume Control on the Connected Device

  1. Open an app and play

    2. app_01
    app_02

  2. Adjust the volume

    3. volume_smp_1

Select the state after checking

Thank you for using Troubleshooting Guide.

There seems to be a problem with the product.
If you require more assistance, please contact your local JVC customer support.

The power is off if there is no light on the earphone.

Check whether the power of the earphones can be turned on.

Turn on the power of the earphones

Touch and hold the touch sensor of the earphone that is not lighted up for about 3 seconds.
PLAY_button_L_A4T + SPNV_Button L_A4T

Touch sensor area

The L side of the earphone is used in the illustration above.

The power of the earphones is on if the L and R indicators are flashing (regardless of how the light flashes).

Select the state after checking

Return to the top of the page and re-select the pattern in which the indicators are flashing.

The charging case and earphones have run out of power.

Charge the earphones followed by reconnecting to check whether sound can be heard properly.

Charge the charging case and earphones

  1. Open the charging case

    2. Case_open_A4T

  2. Insert the earphones into the charging case

    3. charging_1_A4T
    charging_2_A4T

    After the earphones are inserted into the charging case, the power of the earphones will automatically turn off.

  3. Charge the charging case and earphones

    4. charging_2_No-PC_charge_A4T + Charge_2_A4T

    5V TYPE

    Indicator

    The indicator on the charging case starts flashing, indicating that charging has started.

    During charging of the charging case, the indicator on the case will continue to flash. When charging is complete, the indicator lights up.

    The indicators on the earphones light up while charging the earphones. When charging is complete, the indicators go out.

    When charging the earphones or charging case that have not been used for a long period of time, it might take some time for the indicators to light up. Wait for the indicators to light up.

    Click here if the indicators do not light up or start flashing ＞＞

Connecting to a Device

  1. Remove both earphones at the same time

    2. Be careful not to touch the touch sensor area when taking them out.

    Case_button_LR_A4T + SPNV_Case_button_A4T

    Touch sensor area

    The indicators on both sides of the earphones start flashing and the power turns on.

    Wait for a short while. When the R indicator starts to flash twice every 5 seconds and the L indicator starts to flash quickly, the earphones are ready for device pairing.

    After taking out the earphones, move the L and R earphones close to the device to pair with.

  2. Turn on the BLUETOOTH connection setting of the device and select “JVC HA-A4T”

    3. connecting_smp_1
    connecting_smp_2
    connecting_smp_3 + Device List JVC Nav

    JVC HA-A4T

    blue_flash_A4T

    The earphones are connected to the device if the indicators on both sides of the earphones are flashing every 5 seconds.

Apps and Volume Control on the Connected Device

  1. Open an app and play

    2. app_01
    app_02

  2. Adjust the volume

    3. volume_smp_1

Select the state after checking

Thank you for using Troubleshooting Guide.

If there is no sound although the indicators are flashing, return to the top of the page and re-select the pattern in which the indicators are flashing.

The earphones may not have been properly charged.
Please check the following.

Unable to charge ＞＞

Select the pattern in which the L earphone is flashing.

The L earphone is connected to the device but a connection error has occurred on the R earphone.

Power off and on the earphones again and check whether there is any abnormality with the sound output.

Powering off and on again (when charging case is available)

  1. Insert the earphones into the charging case

    2. charging_1_A4T

    The earphones power off and charging starts.

    The indicators on the earphones light up when charging starts, and the indicator on the charging case lights up and flashes.

    When charging the earphones or charging case that have not been used for a long period of time, it might take some time for the indicators to light up. Wait for the indicators to light up.

    Click here if the indicators do not light up or start flashing ＞＞

  2. After the indicators on the earphones and charging case are lit, remove both sides of the earphones at the same time

    3. SPNV_connecting_A4T

    The indicators on both sides of the earphones start flashing and the power turns on.

    After taking out the earphones, move the L and R earphones close to the device to pair with.

    If the R earphone is not flashing once every 5 seconds, go to the section on “Sound cannot be heard” at the bottom of the page.

Powering off and on again (when charging case is not available)

  1. Touch and hold the touch sensor of the earphone that is flashing for about 3 seconds to turn off the power

    2. The indicator light goes out.

    The power has already been turned off if the light is off before touching the touch sensor. Go to step “2” in this case.

    PLAY_button_LR_A4T + SPNV_Button LR_A4T

    Touch sensor area

  2. Touch and hold the touch sensor on both earphones for about 3 seconds to turn on the power

    3. When turning on the power, move the L and R earphones close to the device to pair with.

    PLAY_button_LR_A4T + SPNV_Button LR_A4T

    Touch sensor area

    After the power is turned on, the indicators on both sides of the earphones start flashing.

    After the power is turned on, move the L and R earphones close to the device to pair with.

    If the R earphone is not flashing once every 5 seconds, go to the section on “Sound cannot be heard” at the bottom of the page.

When power of the earphones is turned on again, connection will be established automatically with a device that was previously paired.
If connection cannot be established, please try the following.

Connecting to a Device

    Turn on the BLUETOOTH connection setting of the device and select “JVC HA-A4T”
    connecting_smp_1
    connecting_smp_2
    connecting_smp_3 + Device List JVC Nav

    JVC HA-A4T

    blue_flash_A4T

    The earphones are connected to the device if the indicators on both sides of the earphones are flashing every 5 seconds.

Apps and Volume Control on the Connected Device

  1. Open an app and play

    2. app_01
    app_02

  2. Adjust the volume

    3. volume_smp_1

Select the state after checking

Thank you for using Troubleshooting Guide.

Initializing the earphones and re-establishing the connection may help to solve the problem.

Follow the steps below to check whether there is any abnormality with the sound output.

Initializing

First of all, go to the Bluetooth settings of the device to be connected and delete the information of this unit that is registered on it.

Charge the charging case beforehand.

Follow the steps below to initialize the settings of both L and R earphones.

  1. Remove the L earphone from the charging case

    2. Initializing_1_A4T

    Make sure that the Bluetooth device is not connected (the indicator flashes twice every 5 seconds, or flashes quickly repeatedly).

  2. Tap the touch sensor area 3 times (for the third time, keep touching until the indicator lights up)

    3. Release your finger after the indicator lights up.

    Initializing_L_A4T_New + Initializing_L_A4T_New

    Touch sensor area

    Release your finger after the indicator lights up.

    Touch and hold

    The indicator lights up for 5 seconds.

  3. Tap the touch sensor area twice while the indicator is lighting up

    4. The indicator will flash and then go out, and the power will be turned off.

    If you do not tap the touch sensor twice while the indicator is lit, start again from step 2.

  4. Insert the L earphone into the charging case

    5. Initializing_2_A4T

  5. Remove the R earphone from the charging case

    6. Initializing_3_A4T

    Make sure that the Bluetooth device is not connected (the indicator flashes twice every 5 seconds, or flashes quickly repeatedly).

  6. Tap the touch sensor area 3 times (for the third time, keep touching until the indicator lights up)

    7. Release your finger after the indicator lights up.

    Initializing_R_A4T_New + Initializing_R_A4T_New

    Touch sensor area

    Release your finger after the indicator lights up.

    Touch and hold

    The indicator lights up for 5 seconds.

  7. Tap the touch sensor area twice while the indicator is lighting up

    8. The indicator will flash and then go out, and the power will be turned off.

    If you do not tap the touch sensor twice while the indicator is lit, start again from step 2.

  8. Insert the R earphone into the charging case

    9. Initializing_4_A4T

  9. Remove the earphones from the charging case and place them so that the L and R earphones are placed next to each other

    10. connecting_LR_1_A4T

    The L and R indicators light up and the power turns on.

    After a short while, the L indicator starts to flash quickly and repeatedly. The R indicator flashes twice every 5 seconds repeatedly.

    connecting_LR_2_A4T

Connecting to a Device

    Turn on the BLUETOOTH connection setting of the device and select “JVC HA-A4T”
    connecting_smp_1
    connecting_smp_2
    connecting_smp_3 + Device List JVC Nav

    JVC HA-A4T

    blue_flash_A4T

    The earphones are connected to the device if the indicators on both sides of the earphones are flashing every 5 seconds.

Apps and Volume Control on the Connected Device

  1. Open an app and play

    2. app_01
    app_02

  2. Adjust the volume

    3. volume_smp_1

Select the state after checking

Thank you for using Troubleshooting Guide.

There seems to be a problem with the product.
If you require more assistance, please contact your local JVC customer support.

An error has occurred in the connection between the L earphone and the device.

Connect it to the device and check whether there is any abnormality with the sound output.

Connecting to a Device

    Turn on the BLUETOOTH connection setting of the device and select “JVC HA-A4T”
    connecting_smp_1
    connecting_smp_2
    connecting_smp_3 + Device List JVC Nav

    JVC HA-A4T

    blue_flash_A4T

    The earphones are connected to the device when the indicator on both earphones are flashing every 5 seconds.

    If the R earphone is not flashing once every 5 seconds, go to the section on “Sound cannot be heard” at the bottom of the page.

Apps and Volume Control on the Connected Device

  1. Open an app and play

    2. app_01
    app_02

  2. Adjust the volume

    3. volume_smp_1

Select the state after checking

Thank you for using Troubleshooting Guide.

Initializing the earphones and re-establishing the connection may help to solve the problem.

Follow the steps below to check whether there is any abnormality with the sound output.

Initializing

First of all, go to the Bluetooth settings of the device to be connected and delete the information of this unit that is registered on it.

Charge the charging case beforehand.

Follow the steps below to initialize the settings of both L and R earphones.

  1. Remove the L earphone from the charging case

    2. Initializing_1_A4T

    Make sure that the Bluetooth device is not connected (the indicator flashes twice every 5 seconds, or flashes quickly repeatedly).

  2. Tap the touch sensor area 3 times (for the third time, keep touching until the indicator lights up)

    3. Release your finger after the indicator lights up.

    Initializing_L_A4T_New + Initializing_L_A4T_New

    Touch sensor area

    Release your finger after the indicator lights up.

    Touch and hold

    The indicator lights up for 5 seconds.

  3. Tap the touch sensor area twice while the indicator is lighting up

    4. The indicator will flash and then go out, and the power will be turned off.

    If you do not tap the touch sensor twice while the indicator is lit, start again from step 2.

  4. Insert the L earphone into the charging case

    5. Initializing_2_A4T

  5. Remove the R earphone from the charging case

    6. Initializing_3_A4T

    Make sure that the Bluetooth device is not connected (the indicator flashes twice every 5 seconds, or flashes quickly repeatedly).

  6. Tap the touch sensor area 3 times (for the third time, keep touching until the indicator lights up)

    7. Release your finger after the indicator lights up.

    Initializing_R_A4T_New + Initializing_R_A4T_New

    Touch sensor area

    Release your finger after the indicator lights up.

    Touch and hold

    The indicator lights up for 5 seconds.

  7. Tap the touch sensor area twice while the indicator is lighting up

    8. The indicator will flash and then go out, and the power will be turned off.

    If you do not tap the touch sensor twice while the indicator is lit, start again from step 2.

  8. Insert the R earphone into the charging case

    9. Initializing_4_A4T

  9. Remove the earphones from the charging case and place them so that the L and R earphones are placed next to each other

    10. connecting_LR_1_A4T

    The L and R indicators light up and the power turns on.

    After a short while, the L indicator starts to flash quickly and repeatedly. The R indicator flashes twice every 5 seconds repeatedly.

    connecting_LR_2_A4T

Connecting to a Device

    Turn on the BLUETOOTH connection setting of the device and select “JVC HA-A4T”
    connecting_smp_1
    connecting_smp_2
    connecting_smp_3 + Device List JVC Nav

    JVC HA-A4T

    blue_flash_A4T

    The earphones are connected to the device if the indicators on both sides of the earphones are flashing every 5 seconds.

Apps and Volume Control on the Connected Device

  1. Open an app and play

    2. app_01
    app_02

  2. Adjust the volume

    3. volume_smp_1

Select the state after checking

Thank you for using Troubleshooting Guide.

There seems to be a problem with the product.
If you require more assistance, please contact your local JVC customer support.

The settings for the L earphone have been initialized.

Follow the steps below to check whether there is any abnormality with the sound output.

Initializing

First of all, go to the Bluetooth settings of the device to be connected and delete the information of this unit that is registered on it.

Charge the charging case beforehand.

Follow the steps below to initialize the settings of both L and R earphones.

  1. Remove the L earphone from the charging case

    2. Initializing_1_A4T

    Make sure that the Bluetooth device is not connected (the indicator flashes twice every 5 seconds, or flashes quickly repeatedly).

  2. Tap the touch sensor area 3 times (for the third time, keep touching until the indicator lights up)

    3. Release your finger after the indicator lights up.

    Initializing_L_A4T_New + Initializing_L_A4T_New

    Touch sensor area

    Release your finger after the indicator lights up.

    Touch and hold

    The indicator lights up for 5 seconds.

  3. Tap the touch sensor area twice while the indicator is lighting up

    4. The indicator will flash and then go out, and the power will be turned off.

    If you do not tap the touch sensor twice while the indicator is lit, start again from step 2.

  4. Insert the L earphone into the charging case

    5. Initializing_2_A4T

  5. Remove the R earphone from the charging case

    6. Initializing_3_A4T

    Make sure that the Bluetooth device is not connected (the indicator flashes twice every 5 seconds, or flashes quickly repeatedly).

  6. Tap the touch sensor area 3 times (for the third time, keep touching until the indicator lights up)

    7. Release your finger after the indicator lights up.

    Initializing_R_A4T_New + Initializing_R_A4T_New

    Touch sensor area

    Release your finger after the indicator lights up.

    Touch and hold

    The indicator lights up for 5 seconds.

  7. Tap the touch sensor area twice while the indicator is lighting up

    8. The indicator will flash and then go out, and the power will be turned off.

    If you do not tap the touch sensor twice while the indicator is lit, start again from step 2.

  8. Insert the R earphone into the charging case

    9. Initializing_4_A4T

  9. Remove the earphones from the charging case and place them so that the L and R earphones are placed next to each other

    10. connecting_LR_1_A4T

    The L and R indicators light up and the power turns on.

    After a short while, the L indicator starts to flash quickly and repeatedly. The R indicator flashes twice every 5 seconds repeatedly.

    connecting_LR_2_A4T

Connecting to a Device

    Turn on the BLUETOOTH connection setting of the device and select “JVC HA-A4T”
    connecting_smp_1
    connecting_smp_2
    connecting_smp_3 + Device List JVC Nav

    JVC HA-A4T

    blue_flash_A4T

    The earphones are connected to the device if the indicators on both sides of the earphones are flashing every 5 seconds.

Apps and Volume Control on the Connected Device

  1. Open an app and play

    2. app_01
    app_02

  2. Adjust the volume

    3. volume_smp_1

Select the state after checking

Thank you for using Troubleshooting Guide.

There seems to be a problem with the product.
If you require more assistance, please contact your local JVC customer support.

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