Audio Alchemy DDE v.3.0


I need help.
I own a Audio Alchemy DTI v.2.0 and a DDE v.3.0.

My problem is that the DDE won't get the status 'lock' if I feed my digital signal through the DTI which connected to the DDE although I still get analog output signal.
BUT if I feed the digital signal directly through the DDE (bypass the DTI), I get the 'lock' status o.k.
What wrong with my DDE? How to fix it?
Thank you.
phairoj2bc1
Good point Carlton I forgot that.
Would the original poster come back and indicate how he got on.
Thank you guys.
Having read all the suggestions you guys contributed I think my DTI is RIP. The system has been working well for years and just recently the the LED is not lit. If I connect the digital output from the transporter directly to the DDE, everything is OK. It works for both optical connection and coax connection.
Is there a chance to get my DTI fixed?