Troubleshooting - Universal Audio Apollo x8p Hardware Manual

Troubleshooting

If Apollo x8p isn't behaving as expected, here are some common troubleshooting items to
confirm. If you are still experiencing issues after performing these checks, contact
Support.
SYMPTOM
Unit won't power on
No monitor output
Can't hear preamp channels
Can't hear mic or line input(s)
Can't hear Hi-Z input(s)
Can't hear mic input(s)
Preamp controls have no effect
on channel
Can only adjust preamp input
channels
Audio glitches and/or dropouts
during playback
Undesirable echo/phasing
HOST indicator is unlit or red
Static and/or white noise is heard
when nothing is plugged in
Various LEDs inside the unit are
blinking
Apollo X is behaving
unexpectedly
Apollo x8p Hardware Manual
• Confirm power supply connections at power supply input and back of unit
• Confirm Power switch is in UP position
• Confirm AC power is available at wall socket by plugging in a different device
• Confirm connections, power, and volume of monitoring system
• Confirm monitor knob is turned up
• Confirm monitor outputs are not muted (push monitor knob)
• Confirm monitor LEDs are active (check signal flows)
• Confirm preamp gain is turned up for the channel(s)
• Confirm MUTE is not engaged in Console input channel strip
• Confirm mic/line switch setting is correct for the channel
• Confirm nothing is plugged into the channel's Hi-Z input
• Confirm MUTE is not engaged in Console input channel strip
• Confirm volume on connected device is turned up
• Confirm Hi-Z input cable is 1/4" TS only (not TRS)
• Confirm MUTE is not engaged in Console input channel strip
• Confirm +48V phantom power is enabled (if required by microphone)
• Confirm desired channel is selected for control (push PREAMP knob to select)
• Preamp controls are not available for non-preamp channels
• Signal levels for all non-preamp inputs, including digital inputs, are adjusted at the
device connected to those inputs
• Increase audio buffer size setting
• Confirm clocking setups; check cable connections and confirm all device clocks are
synchronized to one master clock device
• Confirm only one input monitoring system is enabled (Console or DAW – not both)
• Confirm Thunderbolt 3 connections
• Confirm Apollo X software is installed
• Power Apollo X off then on, and restart computer
• Reinstall Apollo X software
• Try a different Thunderbolt 3 cable
• Mute or lower preamp gain to minimum on all unused preamp channels (mic preamps
can emit noise even when nothing is plugged in)
• Some UAD plug-ins model the noise characteristics of the original equipment. Defeat
the noise model in the UAD plug-in GUI, or mute the channel containing the plug-in to
temporarily mute the noise
• This is normal operational behavior that can be safely ignored
• As a last resort, perform a hardware reset on the unit by following these steps:
1. Power off Apollo X
2. Press and hold the PREAMP, LOW CUT, and POLARITY controls
3. Power on Apollo X while continuing to hold all three controls
4. After all front panel LEDs flash rapidly (after several seconds), release the controls
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ITEMS TO CHECK
Technical
Troubleshooting