Re: S/P-DIF Interface (internally) on CD players?

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Could you elaborate on what you did for your players? re: "add a couple of bypass caps and a couple of

jumpers in the appropriate places".

The wiring diagrams I've seen show a direct connection from the SPDIF to the Sharp/Toshiba optical

plugs. No caps, etc. Any downside in doing it this way?
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There were jumper wires which were missing on the PCB to get the SPDIF signal and power traces all the way to the transmitter pads. Sony PCBs have lots of jumper wires because they are single sided for low cost. Some of the jumpers were actually supposed to be inductors - to further decouple the supply noise from the transmitter.

The capacitors are merely to reduce high frequency fluctuations on the power supplies due to the switching of the SPDIF transmitter LED. They're not absolutely necessary, but the PCB had spaces for them, so I put them in. i have the factory service manuals from Sony, and I basically followed the schematic for the CX255. The bypass caps must have a tangible benefit to either the optical signal quality or the noise injected back into other parts of the player, or Sony would not have added them. In a low cost item like this, I don't think the put in any more parts than they have to.