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Digi Trafo 3.0 green LED on but no signal on TOS

Is it obligatory that there is a signal (red light) on TOS like this
http://de.wikipedia.org/wiki/Sony/Philips_Digital_Interface#mediaviewer/File:Toslink2.jpg
when green LED D1 is on at HIFIBerry Digi Trafo 3.0 ?

There are no signals on output neither TOSLINK nor electrical, but LED D1 is on (light).

Config in Volumio 1.41PI shows audio output sndrpihifiberry. Mixer disabled.

This way HIFIBerry DAC R1.4 runs with same installation and same config. Excellent sound!

But as soon as I exchange to HIFIBerry Digi Trafo 3.0 no signals at outputs.

What can I do ?

Rgds
AW

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