RME Fireface UCX II 40-Channel USB-B Audio/MIDI Interface - Manual (Page 28)

28 User's Guide Fireface UCX II © RME
12. Hotline
– Troubleshooting
The newest information can always be found on our website
www.rme-audio.com , section FAQ,
Latest Additions.
The 8 ADAT channels don’t show up at the optical output

The optical output has been switched to ‘SPDIF’. The ADAT playback devices are still usable
by routing and mixing them in TotalMix to other outputs.
Playback works, but record doesn’t

Check that there is a valid signal at the input. If so, the current sample frequency is displayed
in the Settings dialog.

Check whether the Fireface UCX II has been selected as recording device in the audio appli-
cation.
 Check whether the sample frequency set in the audio application (‘Recording properties’ or
similar) matches the input signal.

Check that cables/devices have not been connected in a closed loop. If so, set the sys tem’s
clock mode to Master.
Crackle during record or playback
 Increase the number and size of buffers in the ‘Settings’ dialog or in the application.

Try different cables (coaxial or optical) to rule out any defects here.

Check that cables/devices have not been connected in a closed loo p. If so, set the system’s
clock mode to ‘Master’.

Check the Settings dialog for displayed Errors.
Driver installation and Settings dialog/TotalMix work, but a playback or record is not possible

While recognition and control of the device are low bandwidth applications, playback/record
needs the full transmission performance. Therefore, defective USB cables with limited
transmission bandwidth can cause such an error scheme.