DPA, DPA-Q, and DPA-Qn Amplifier Troubleshooting

Every DPA, DPA-Q, and DPA-Qn series amplifier can automatically detect and report problems in its environment. The reports appear as messages on the amplifier's front panel display and also in the amplifier's Status component in the Q-SYS design. Use the steps in this topic to troubleshoot error messages on DPA, DPA-Q, and DPA-Qn series amplifiers.

Note: Amplifier error messages do not necessarily mean the amp has a defect requiring service or replacement. Most messages alert you to issues that can be easily remedied.

1. Determine whether the message indicates an external issue, such as low AC mains voltage

In general, external problems do not require servicing or replacing the amplifier. Internal problems may require service or replacement if they do not respond to preliminary checks like rebooting, resetting, or upgrading firmware.

For example, if the amplifier indicates a problem with low AC mains voltage – a typical external problem – the first step is to measure the actual AC mains voltage to make sure it is 120V or 230V (100V in Japan). Alternatively, you can test the amp with another power source that you know is good. If the measured voltage is outside the correct range (typically ±5% of the 120V, 230V, or 100V spec), consult with a qualified electrician to correct the problem.

Note: It is extremely unlikely for an amplifier to report low AC voltage when the AC mains voltage is good. This would indicate a fault in the amplifier that requires service or replacement.

2. View the amplifier log

Use the Peripheral Manager > Utilities page to download the amplifier log. The log will indicate exactly what the problem is and can also streamline the RMA process if one is needed. Download the log as soon as possible after the problem occurs, which avoids the risk of the log being overwritten by new entries after a few hours. Note that the log is retained when rebooting or powering off the amplifier.

Because the DPA-Q and DPA-Qn amps are only for Q-SYS for Cinema installations, they are accessible via the network. You can use this network access to check, troubleshoot, and verify the amplifier's condition.

1. Upgrade or downgrade the amplifier firmware

This is a useful step to check for software corruption that can cause error messages.

  1. In Q-SYS Designer Software, save a copy of the current Q-SYS design as a backup.
  2. Temporarily downgrade the Core and amplifier firmware by one version or upgrade to the most recent version. To do this, use a simple design that contains only the amplifier.
  3. See if the problem remains. If so, proceed to the next step.

2. Reset the amplifier

CAUTION: This action factory resets the amplifier and erases all logs. Do this only as a final troubleshooting step.

  1. Locate the pinhole reset button on the front panel under the Gain knob.
  2. Using a straightened paperclip, press and hold the reset button until the amp starts to reboot.
  3. Wait for the amp to finish rebooting, and then see if the error message clears.

Refer to the following QSC Self Help Portal article for information regarding the proper power-on and power-off sequence of Q-SYS devices, including amplifiers: