Universal Audio Apollo x16 Heritage Edition Rackmount 18x20 Thunder3 Audio Interface with Real-Time UAD Processing - Manual (Page 32)

Troubleshooting 32 Apollo x16 Hardware Manual
Troubleshooting
If Apollo x16 isn’t behaving as expected, here are some common troubleshooting items
to confirm. If you are still experiencing issues after performing these checks, contact
Technical Support .
SYMPTOM ITEMS TO CHECK
Unit won’t power on • Confirm power supply connections at power supply input and back of unit
• Confirm Power switch is not in “OFF” position
• Confirm AC power is available at wall socket by plugging in a different device
No monitor output • Confirm connections, power, and volume of monitoring system
• Confirm monitor knob is turned up
• Confirm monitor outputs are not muted (press monitor knob)
• Confirm monitor LEDs are active (check signal flows)
Monitor output level range is
too loud or too quiet • Monitor output reference levels can be switched between +4 dBu and -10 dBV in
the Hardware panel within the Console Settings window
Input levels are too high or
too low • Input reference levels can be switched between +4 dBu and -10 dBV in the input
channel strips within the Console application
Can’t fine tune input signal
levels • Signal levels for all inputs, including digital inputs, are adjusted at the device
connected to those inputs
Output levels are too high or
too low • Output reference levels for adjacent pairs can be switched between +4 dBu and
-10 dBV in the Hardware panel within the Console Settings window
Audio glitches and/or dropouts
during playback • Increase audio I/O buffer size setting in DAW
• Confirm clocking setups (check cable connections and confirm all device clocks
are synchronized to one master clock device)
Undesirable echo/phasing • Confirm input monitoring is not enabled in both Console and DAW
HOST indicator is unlit or red • Confirm Thunderbolt connections
• Confirm UAD Powered Plug-Ins software is installed
• Power Apollo off then power on Apollo, and restart computer
• Reinstall Apollo x16 software
• Try a different Thunderbolt cable
Faint static and/or white noise
is heard when nothing is
plugged in • Mute unused inputs
• Some UAD plug-ins model the noise characteristics of the original equipment;
defeat the noise model in the UAD plug-in interface, or mute the channel
containing the plug-in to temporarily mute the noise
Various LEDs inside the unit
are blinking • This is normal operational behavior that can be safely ignored
Apollo x16 is behaving
unexpectedly • As a last resort, perform a hardware reset on the unit by following these steps:
1. Power off Apollo x16
2. Press and hold the METER and MONITOR controls
3. Power on Apollo x16 while continuing to hold both controls
4. After all front panel LEDs flash rapidly (after several seconds), release the
controls.