I am using a DMHD-1000 and want to interface an optical digital audio connection to reduce line noise and alternator whine. I have seen this hack applied to a home HD Radio. I have an XMPCR Toslink module and am trying to connect it to my HD Radio. I have searched all but 2 chips on this product and cannot find the final D/A converter circuit and none of the Test Points are labeled well. It is hard to trace back from the analog output as the main board is 4-layer - It does have a 30-pin breakout like the XMPCR and XMDIRECT main board interfaces, but the actual signals are unknown to me. I tried the dealer site but do not have an account number to access their repository. I also tried complex to simple search strings in Google and on Mp3 Car with no relevant results. Does anyone have access to Directed's service manual repository so I can get pin outs and schematics for the DMHD-1000 HD Radio or does anyone know how to get the pinout information for this radio?
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HD Radio Optical Digital Output Hack