Question for Oppo 105 owners...digital out to an external DAC ?

Hello all,

I wish to try a Cambridge Dac I've had on hand for a few years to see how it compares with the built-in Sabre dac in the Oppo.

So I am looking essentially at trying the Oppo 105 as a pure transport only, without interference from the sabre dac.

Looking at the back panel and manual doesn't help much.

Thanks if you can help!