Not working digital out board in a TEAC VRDS-9 player: any experience of this?

Hello,
the board is not working. It receives power and digital signal, but nothing comes out of either output - the coaxial and the optical.
Does anyone have any experience of a similar issue so that I can try to pinpoint where the problem is? I am not sufficiently equipped technically to check the whole board myself, so waiting for some help from a technician I am asking here.
Thanks
H
 

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How do you know the board is receiving a Digital Signal?

It will go almost certainly to Pin 1 of the 74HCU04 and whose 6 internal 'devices' will probably be parallelled to be able to drive the OutPut Transformer.
If you're sure the board has a Digital I/P but nothing coming out of the O/P Sockets, my guess would be the 74HCU04