Apollo 8 Hardware Manual Troubleshooting 41
Troubleshooting
If Apollo 8 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 (push monitor knob)
• Confirm monitor LEDs are active (check signal flows)
Can’t hear channels 1 – 4 • Confirm preamp gain is turned up for the channel(s)
Can't hear mic or line
input(s)
• Confirm mic/line switch setting is correct for the channel
• Confirm nothing is plugged into the channel’s Hi-Z input
Can't hear Hi-Z input(s) • Confirm volume on connected device is turned up
• Confirm Hi-Z input cable is 1/4” TS only (not TRS)
Can’t hear mic input(s) • Confirm +48V phantom power is enabled (if required by microphone)
Preamp controls have no
effect on channel
• Confirm desired channel is selected for control (push PREAMP knob to select)
• Preamp controls are available for channels 1 – 4 only
Can only adjust input
channels 1 – 4
• Signal levels for all other inputs, including digital inputs, are adjusted at the device
connected to those inputs
Audio glitches and/or
dropouts during playback
• Increase audio buffer size setting
• 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 Apollo software is installed
• Power Apollo off then on, and restart computer
• Reinstall Apollo software
• Try a Thunderbolt cable
Static and/or white noise
is heard when nothing is
plugged in
• 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
Various LEDs inside the unit
are blinking
• This is normal operational behavior that can be safely ignored
Apollo 8 is behaving
unexpectedly
• As a last resort, perform a hardware reset on the unit by following these steps:
1. Power off Apollo
2. Press and hold the PREAMP, LOW CUT, and POLARITY controls
3. Power on Apollo 8 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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