First, thank you glt, Russ, alazira and Brian for the help and suggestions. This is an excellent DAC, and without it I miss the attack and liveliness in music.
The DAC has worked flawlessly since build until this incident. When I moved in September,the DAC became prone to ground bounce at this location, but not at previous location. This while troublesome, did not affect the operation.
Placed X cap across AC inputs, but did not change.
Digital and low level sources are fed from a filtered AC supply.
Normally digital sources are powered on at all times.
Only on this one occasion returned home to find no signal from DAC.
To answer the questions:
Voltages:
Placid 1 feeds MUX = 5.5v
Placid 2 Feeds Buffalo II + 5.5v
Placid BP to Legato = - 14.5 , +14.6
Current measured at Placid BP .056, .058
AVCC voltages ok.
When initially powered on, both lock and mute light illuminated.
2 sources are in use:
First is a Squeezebox, the second is a CD player. Both work properly through SPDIF into an older DAC, so they are not suspect.
On Buffalo II selecting either output with MUX, the lock and mute lights remain illuminated.
Bypassing MUX directly into SPDIF on Buffalo II does not have any effect.
Also disconnecting and reconnecting SPDIF, does not change MUTE/ LOCK light.
DAC remains silent through all above changes.
DAC was prone to ground bounce at this location, but not at previous location. Placed X cap across AC inputs, but did not change.
Unsure if that would cause any damage.
Thank you.
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