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I did not know there was a lock led on the bIII ???
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Ok, so I soldered a led on the lock and I am getting no lock on the input.
here's what's going on:
I have a dual mono config driven by ian's reclcocker. This works as my i2s input. I checked using another dac and it is fine so we can say that the i2s source is ok.
everything was working just fine until a couple of days ago, as I was listenning to music, it just stopped suddenly for no apparent reason. I checked dc Voltage on the legato and that seems to be working fine since I can tweak it with the trimmers.
So the problem seems to be on the BIII boards. I tried with a spdif directly on the BIII with no lock either. I replaced the atmel chip with the other chip I had with no result although I think that that chip never worked. I can undo the dual mono to configure in stereo and troubleshoot one board at a time but I haven't done that yet.
I need support from TP to try to get this up and running again.
thanks.
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If it was working and now it is not then something has to have changed.
It could be several things.
- Wiring has become loose?
- Critical component failure? (PS etc)
- Critical inputs have become damaged?
Carefully check all wiring.
Next thing to do is measure the output of AVCC and all Tridents.
If all of that is OK then it is possible something has become damaged by ESD or some other external influence.
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Thanks for feedback Russ.
I assure you that I have not changed anything on my setup lately. I regularly try new things and my next mod would have been a synch clock but I did not get to that yet because it requires de-soldering the clocks. As I said, the music just stopped completely.
I've checked everything and still get the same no lock issue. I changed inputs from I2s to spdif with the same problem. So I am guessing that something was damaged by ESD or other. Question is: How do I identify what was damaged? Is it possible that the ESS chip was damaged ? I cannot confirm at this point if both channels are damaged. Is it possible the atmel chip is damaged?
I will have to resort back to testing in stereo each channel to identify root cause but if both boards are out, the atmel chip may be blown. (I see that there is a new chip available which I may order).
I will verify all wiring this weekend.
from your experience, what can cause no lock issues?
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The Atmel chip is probably not the issue. You can run the DACs without it, though they will not be configured properly. I have never seen a uC "blow" on a Buffalo.
You are having this problem on two (mono) DACs at the same time? That would indicate the problem is likely not the DACs, but I suppose it's possible.
Is the Automute LED on on the DACs?
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Brain brings up very good points.
It is worth checking each DAC separately. You can even run them with no firmware for testing.
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thanks guys. I'll go back to stereo and test separately. I've also never seen a blown atmel chip but I also never heard of a dac system just stopping suddenly. I was thinking more in terms of an esd'd atmel resulting perhaps in setting the dac in an obscure state. yes, both dacs are affected. Don't know if automute is on but I will solder the leds on both dacs. I was suspecting the legato at first but the lock light is not on so that would indicate something wrong on the dac boards. It is strange that both dacs are affected but that leans me to think it's a controller problem (one controller for both dacs in dual mono). Nonetheless, I'll verify the connections again, check voltages on regs and hope the dac chips are not fried. Edited by user Friday, April 12, 2013 6:51:56 PM(UTC)
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Hi again.
so I soldered 4 leds on the 2 boards. I kept the dual mono config.
here's what I get:
so now I'm just testing the channel with the atmel chip.
The a-mute light stays on. and the lock light stays off. If I remove the atmel chip, lock light goes on.
does this mean the atmel chip for som reason is damaged? I tried with both chips I had with same results.
please advise.
thanks.
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more testing this morning.
here's the problem.
there is no lock when the atmel chip is in place. I remove the chip, I get a lock on both channels but there is high distortion. I hear the music but the distortion is very present on both channels.. So I'm figuring that the atmel chip was damaged so I need to order the update from you. AT least, I'm hoping that the atmel chip is the root cause of the issue and the dacs will still be functional when I replace the atmel.
note: the boards are still configured in dual mono.
What would you suggest that I do next?
regards.
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Pictures of how you have the dip switches configured would help.
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well, I got the lock with the atmel chip attached to the main board (I guess I ordered the update chips for no reason now). second board empty. I simply reconnected everything as it was before it stopped working.
I still get very loud distortion on top of the music.
dip settings on board with atmel as follows:
sw1: bit 1 to 8: 1110 1110
sw2: bit 1 to 8: 1110 0010
i2c connected between 2 boards.
still hoping to salvage the dac chips.
Is it possible the legato is damaged?
what can I check next?
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I got the new atmels so Here's what I did:
I reverted to single stereo boards and tested individually. That checked OK with the new chips.
So I went on and reconfigured for dual mon and works perfectly now except for the same noise problem as originally posted. I haven't gotten around to try what was mentionned here.
Si now, I'm back up and running. thanks for support.
regards.
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