Rank: Member
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Joined: 11/21/2008(UTC)
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Location: Norway
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hello folks
sry to post this, but sat down to play -y-day and my dac is dead
If´s been playing for a few weeks since I installed the new L3 and all has been well.
It does not work whether I choose s/pdif or I2S input
S/pdif is via MUX and USB is via EXA devices usb to I2S converter (exa locks and shows input format too)
dac is fed 5.45vdc from Placid
all 3 Tridents deliver 3.3/3.3 and 1.2 vdc respectively
AVCC measures 3.3vdc on both sides
Legato 3 gets 14.45 vdc and pulls correct currents with respective shunt on a Placid per channel only run (unbuffered) balanced
measures approx or close to 0 mvdc between + and - on bal out
(approx 7.8vdc between each phase and gnd on bal out)
any ideas?
and yes...system works with dvd player straight into tvc
best
Leif
Norway
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Rank: Administration
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As always pictures can help. But first off, is you lock LED lighting when a good signal is applied?
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Rank: Member
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Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
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Russ White wrote:As always pictures can help. But first off, is you lock LED lighting when a good signal is applied? YES I´ll check again later when I get back from work happened to me once before the voltage to the dac drifted over 5,5vdc and it muted for some reason will be back in 4,5 -5 hours when I´m home from work best Leif
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Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
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Was thanked: 89 time(s) in 83 post(s)
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Have you checked the output of the Legato directly? Either with a scope or with a small speaker like a headphone (driven from +out to -out). I have a small 16ohm speaker I use from time to time for just a such purpose.
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Rank: Member
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Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
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can I not just measure ac? if signal, it will fluctuate?
If I don´t locate the fault I´ll replace dac board and se if it behaves
best
Leif
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Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
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You can use any method you please. :)
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Rank: Member
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Joined: 11/21/2008(UTC)
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I´ll be back thxs
best
Leif
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Rank: Member
Groups: Member
Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
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hello I´m back
checked all voltages again
readjusted shunt to 56mv on the dual legato psu´s.....still 14.45vdc too
readjusted BII voltage down to 5.4vdc from 5.45
all other voltages on tridents and avcc as before
readjusted the offset on the bal outputs between + and - and they´re stable @ 0.00 !
reconnected to system
and
IT WORKS ??!!
beats me but I don´t care
thxs for excellent support (as usual)
best
Leif
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