I would really like to restore the output to my preamp but am fully aware from reading some of the Cyrus related threads here that this is unlikely to be a DIY success. Not least because there are no circuit diagrams available even for experienced audio electronics engineers to access.
So my key question is whether there might be a straightforward diy check that could result in a safe diy repair?
The issue with my unit is that it powers up fine and does not go into error mode ie orange power light or shut down. The unit has never blown a fuse and I can't think of any time it has been subject to a mains surge.
The headphone part works without issue, full volume control and sounds really good. There is though no output from the pre-out into my Smartpower amp. I have tried both pre-out 1 and pre-out 2. Input is fine across CD, Aux etc and all provide undistorted sound to the headphone ouput.
I opened the unit and found that the two large blue 4700 uf 40v caps (c319 and c317) were showing 3500 uf so replaced. Also noticed that one of the 100 uf 50v caps was bulging so replaced both with Nichicon Muse equivalent. This is as shown on the attached pics.
I have closely inspected the traces under the board using a magnifier and can see nothing that looks broken.
Those who are familiar with Cyrus will know that this is not a supported unit and even when it was there was a whopping £300 plus postage charge which is far more than it is worth.
I am really reluctant to bin this but before reaching that conclusion thought I should run this past the highly knowledgeable members on this forum. If you are able to help that would be welcomed and might result in one less bit of landfill.
Initial internal photos attached for reference.
So my key question is whether there might be a straightforward diy check that could result in a safe diy repair?
The issue with my unit is that it powers up fine and does not go into error mode ie orange power light or shut down. The unit has never blown a fuse and I can't think of any time it has been subject to a mains surge.
The headphone part works without issue, full volume control and sounds really good. There is though no output from the pre-out into my Smartpower amp. I have tried both pre-out 1 and pre-out 2. Input is fine across CD, Aux etc and all provide undistorted sound to the headphone ouput.
I opened the unit and found that the two large blue 4700 uf 40v caps (c319 and c317) were showing 3500 uf so replaced. Also noticed that one of the 100 uf 50v caps was bulging so replaced both with Nichicon Muse equivalent. This is as shown on the attached pics.
I have closely inspected the traces under the board using a magnifier and can see nothing that looks broken.
Those who are familiar with Cyrus will know that this is not a supported unit and even when it was there was a whopping £300 plus postage charge which is far more than it is worth.
I am really reluctant to bin this but before reaching that conclusion thought I should run this past the highly knowledgeable members on this forum. If you are able to help that would be welcomed and might result in one less bit of landfill.
Initial internal photos attached for reference.
Attachments
If all repair attempts fail, you can use headphone output as pre out, just make cable adapter.
It could be simple relay.
It could be simple relay.
Thanks for the really practical suggestion, I had considered as a possibility but have this lingering curiosity about whether there might just be something obvious and repairable on the board.
Adason might not be far away from the truth . I have Cyrus equipment and all of it like your preamp has an input for an outboard power supply . On switch on the system looks for this first and if not there the logic goes into standard operation . Any chance you can borrow a power supply and plug it in to see if it makes any difference ? Mine is the PSX-R power supply but I think they have the same input socket as I can use mine on the CD player /DAC etc .
Thanks for that. I have one on my main set-up and will give that a try tomorrow and let you know the outcome.