Kai, please don't apologise. No duty for a fast reaction, it's our hobby.
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Your result points more to a broken PCM1804. It's the highest probability. But to exclude something more you may test this:
- Check voltage at IC403 pin 2 and pin 14 to GND. Both should show around 1.6V (pulses with 3.3V high and 50% duty cycle.) But take care not to connect these pins to others. You may destroy IC204. And it's hard to have access to IC403. If you don't want to check these voltages, no problem. If the TX is working there is a high probability the two signals are ok.
- Check voltages at IC405 and IC406 pins 1, 2, 3, 5, 6 and 7 to GND. For all you should see something around 2.5V.
If you don't want to replace the PCM1804 by yourselves you may contact Jeff Moore (please check th forum for his name).
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I wish you success. 73 Ludwig
