No sound from SPDIF

Hello this is the first time I post on the site. I have a problem with setting the table. I explain I have a Motu 2408 mk3 card and DA7 ramsa 3 TDIF cards. I set the port 3 of the motu SPDIF to send the sound of the Motu Ramsa in (Send / Return) 1/2. I am on Ramsa signal that shows me that the sound is perceived but I have no sound comes out. Does that sound should come out by the Master L / R TDIF or the SPDIF back of the Motu?
I do not know if I explained well but I do not know anything yet about setting the Ramsa.
thank you

i finally found how to resolve this problem. for everybody if your DA7 don't play sound out replace the 3 fuses 6.3A of the PCB.

Thank you for posting this, as I'm a new user running into this issue, I was operating under the most likely premise- user error.