Threshold DAC2 Schematic

[DWilson001]

Hi,

I was wondering is anyone has the schematic to the DAC2? I have one that is not coming out of "Hard Mute". It seems that all of the custom components are working properly because if I float pin 17 of the HDCD (PDM-100) and gently ground it (4.7k ohm) it passes the digital streams to the DAC's and I can faintly hear the stereo output bleeding thru the analog mute/relay. I'm using the toslink input, but have not confirmed any other input. The input switching and power supplies also seems ok. I have no other indicators other than the power LED.

There is a PAL 16V8 chip that is the source of controlling the [inactive] mode LED's and analog mute circuits. Of coures, without validating the inputs are correct, I can only suspect either a logic issue with it or other source input circuitry holding the whole thing in hard mute. I have located a post of the AES-21 that has a PDF attachment, which has most of the DAC2 circuitry on it except for the multiple input circuits. But it doesn't encompassing the PAL part. I would even try programming another 16V8 if anyone has the source file(s), but my assumption is that it's secured.

Any help out there or suggestions are welcome!

Thanks
Don