Guys I picked up this dac at a very tasty price with the intention of swapping out my arcam DAC. It powers up fine, but with optical in does not lock onto a signal. If I put the Arcam back in the sound is fine, put the 202 back in and nothing, just a green power light. The DAC came with a coaxial lead, this is not an option for me but indicates it was used with that and not the optical, is there a dip switch I have to change or whatever, just want to check all the bases before this thing goes back to the shop. (Which would be a real shame)