Troubleshooting - Universal Audio apollo Hardware Manual

Troubleshooting

The table below lists some common operational issues and steps you can take to help resolve the situation. If
you need further help, contact Technical Support.
SYMPTOM
Unit won't power on
No monitor output
Can't hear channels 1 – 4 • Confirm preamp gain is turned up for the channel(s)
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 input
channels 1 – 4
Audio glitches and/or
dropouts during playback
Undesirable echo/phasing • Confirm input monitoring is not enabled in both Console and DAW
UAD Link LED is red
Static and/or white noise
is heard when nothing is
plugged in
Various LEDs inside the
unit are blinking
Apollo is behaving
unexpectedly
Apollo FireWire Hardware Manual
• 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
• 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 mic/line switch setting is correct for the channel
• Confirm nothing is plugged into the channel's Hi-Z input
• Confirm volume on connected device is turned up
• Confirm Hi-Z input cable is 1/4" TS only (not TRS)
• Confirm +48V phantom power is on (if required by microphone)
• Confirm desired channel is selected for control (push PREAMP knob to select)
• Preamp controls are available for channels 1 – 4 only
• Signal levels for all other inputs, including digital inputs, are adjusted at the device
connected to those inputs
• 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)
• Confirm connection to host computer
• Confirm Apollo software is installed
• Power Apollo off then on and restart computer
• Reinstall Apollo software
• Try a different FireWire 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 (for the
control numbers below, refer to the front panel diagram on page 10):
1. Power off Apollo
2. Press and hold the PREAMP (#2), LOW CUT (#5), and POLARITY (#8) controls
3. Power on Apollo while continuing to hold all three controls
4. After all front panel LEDs flash rapidly (after several seconds), release the controls
ITEMS TO CHECK
31 Troubleshooting