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HI I'm trying to fire up my dac for the first time, everything seems fine, no lock, tried both PC and Squeezebox S/PDIF. jrobson attached the following image(s):  2012-07-06_02-53-34_124.jpg (235kb) downloaded 83 time(s).You cannot view/download attachments. Try to login or register.
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I know the left RCA has a yellow connector. I'm not trying to plug in there, I just used that cable instead of my usual cable to see if that helps... current is good 475 on HD and 250 on BP, the only strange thing I did was to wire a switch in to allow 2vrms/4vrms out on the IVY. Currently set at 2vrms but 4vrms makes no difference. Any idea on where to start? From the S/PDIF converter I get around 2v to the dac D1. Checked and converter is getting 5.19v from dac. Edited by user Friday, July 6, 2012 12:54:40 AM(UTC)
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How are your DIp switches set?
Also until you get a lock don't connect the IVY at all. Remove it for now.
The rule when solving problems is to make them as simple as possible. :)
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Hi
All off.
Ivy off, I've tried DIP 5, then 5 & 6, then 5,6 & 7, then 5, 6, 7 & 8, then all by self, then combinations, nothing.
Also tried auto detect off.
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I think I have a loose toslink connector lying around, can I wire the Toslink on D1 as is to test and see if it's the DAC or the S/PDIF module or do I need to add a small circuit first?
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Unfortunately I can't see any of the wiring detail in you picture. may take multiple pictures, especially focusing on wiring etc.
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Here you go. jrobson attached the following image(s): Wiring.jpg (160kb) downloaded 86 time(s).You cannot view/download attachments. Try to login or register.
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Bump... Any ideas / guide on testing?
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Do you have access to a scope (even a very simple one) to check of an AC signal is coming out of the SPDIF board?
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That one does not quite have the bandwidth. At least 40Mhz would be good.
It also might be good to try another source.
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Thansk, I don't want to spend the kind of money a 40mhz unit costs.
I have two sources, PC and Squeezebox, neither works, there wouldn't be much reason for me to try another source since if that source works I still can't use the DAC if it doesn't work on either PC or Squeezebox.
I get 3.6-3.8V measuring the TTL line at D1 on AC.
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You can't really measure it with a DMM. It's a high speed AC signal.
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Are you certain you have good contact at all of the VRegs? Tridents and AVCC.
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Right, well I was hoping that if I get positive voltage around the correct amount on the TTL input that would mean it's working, I'll try and find someone with a scope, otherwise I have to purchase one second hand, but they are not easy to get. I have an option to try out another consumer-TTL converter from someone close to me developing his own sabre DAC, but that will only be in two weeks.
Everything measures fine, I re soldered the contacts last night just to make sure, I left it on for a while, still no locking.
Besides the TTL signal what else is there to look for?
What are the consequences if there is a TTL signal? Where do we go from there?
Regards,
Jonathan.
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Can you (very carefully) measure the output voltages from each of the Tridents? Try measuring them from the botttom of the DAC board. This will confirm both voltage and, to some degree, connectivity of the pins.
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Measuring from the bottom.
5.22v input, 3.1v out
5.24v input, 3.3v out
5.2v input, 1.18v out
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