ART Pro Audio TubeOpto 8 - Eight Ch. Mic Preamp with ADAT - Manual (Page 12)

Troubleshooting
Here is a list of things to check first:
1) Check the power switch. It should be lit red (when the switch is depressed of course). If not lit red, check
the power connections and fuse on the rear panel.
2) Check the Sample Rate lights. There should always be at least one lit. On power up, they first ALL light
then light one at a time from 44K to Wordclock and finally settle to the current sample rate. If the unit does
not go through this sequence in the first 5 seconds of power up, there is a problem with the digital section.
3) If you are getting distorted audio, check to make sure that there are NO red LEDs lit on each channel’s
meter. (The clip indicators work even if the output controls are set to minimum). Reduce the Input Gain
control first to eliminate clipping.
4) If the yellow LED is flashing under any sample rate settings, the D/A outputs are muted.
5) If ADAT sync is selected, the A/D and D/A are muted if the yellow LED is flashing. Apply valid ADAT data
to the ADAT Input to correct this.
6) If the Wordclock LED is flashing, the unit cannot sync to the wordclock signal applied to the unit. Check
the connection and termination to the Wordclock jacks on the rear of the unit. Make sure that the incoming
sample rate is between 40KHz and 52KHz. Use an Internal sample rate (44.1KHz or 48KHz) or sync to
ADAT if Wordclock is not available.
7) When using the Tubeopto 8™ as a Preamp-to-ADAT only, if the red Wordclock LED is on solid or either of
the green (44.1KHz or 48KHz) LED’s are on then the Preamp, A/D, and ADAT Output sections will be
functioning normally. In this case if the yellow ADAT LED is flashing it just means that you are not using
the ADAT Input section.
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