RME Fireface UCX II 40-Channel USB-B Audio/MIDI Interface - Manual (Page 37)

User's Guide Fireface UCX II © RME
37
18. Hotline
– Troubleshooting
The newest information can always be found on our website
www.rme-audio.com , section FAQ,
latest Additions.
The unit and drivers have been installed correctly, but playback does not work:

Has Fireface been selected as current playback device in the audio application?
The 8 ADAT ch annels don’t seem to work

The optical output ADAT 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 application.

Try different cables (coaxial or optical) to rule out any defects here.
 Check that cables/devices have not been connected in a closed loop. If so, set the system’s
clock mode to ‘Master’.

Check the Settings dialog for displayed Errors.
Possible causes for a Fireface not working

The USB cable is not, or not correctly inserted into the socket
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.