Mini CD-Pro2 Transport Kit - Page 4

I'm interested in progress updates and any pics - good luck!

Any luck resolving your problem? I am having exact same one. I did not ry to replace the CD-Pro, but I did check the SPDIF output (both of CD-Pro and of the Mini CD-Pro) with a scope, and it does look like a normal SPDIF signal. However, my DAC does not recognize it 
 

Quote:

Originally Posted by schubert 

HELLLLP!!  Anyone who has successfully (or unsuccessfully) built one of these Mini CD-Pro units - I'm having trouble.  I got it put together, but all I get is buzzing, crackling and distant sound.  Other digital sources play through the board with no problem.  I get no sound when I take the S/PDIF output directly from the Philips unit to the DAC.  Replacing the Philips unit made no difference (note:  CD-Pro2 supplier ENCO Systems - http://www.enco-group.com/ - is GREAT with customer service)

 

Hifidiy is trying to help but they seem kind of baffled too.  Anyone out there have any ideas? 

No luck yet.  The boards are in China for the second time, and each time they tell me that they are fine.  So now they are on their way to Lei Song in California, and he's sending me a set of his boards.  I'll try his boards in my case, and he'll try my boards in his case, and we'll go from there.

Have you tried sending a S/PDIF signal from another unit through your board to your DAC?  When I did that the signal was fine.  The signal directly from the Philips CD-Pro unit was taken by my DAC as well - it's only when the two are used together that the problem arises.  My power board gives the wrong voltages at the terminals marked "9 G 5" - I get more like 11.5, 0 12V.  I think this makes the opamp on the display board shut down, which in turn affects the signal put out by the CD-Pro.  Hifidiy tells me they get the correct voltages here, so I don't know what's going on, for my voltages are correct everywhere else.

Please post if you get it figured out.

Any luck yet?

I got a reply from Hifidiy.net: "Please replace the 100kohm resistor that is close to the 74VHC74 by a 15kohm and then check". The only 100k resistor that may be relevant is the one providing feedback to the invertor in 74HC04 which acts as an amplifier, bringing the EBU/SPDIF voltage to the CMOS logic level. I will check that over the weekend.

Alternatively, I am thinking of connecting the EBU connector of the CD-Pro (which is already isolated by a transformer on CD-Pro's board) directly to the RCA connector in the back of the transport. Optical and balanced outputs would not work, but I can live with that.

I hate to resurrect this thread yet again, but my mini-CD pro transport has died and I need help!  It was working fine for a few months,and one day it just stopped recognizing discs - any CD I put in results in a "No Disc" message.  I'm not sure what to check other than the voltages on the power board, and they're OK when the CD-Pro module and display board are disconnected, but several go way out of whack when the CD-Pro and display board are connected.  These are the voltages supplied by HiFiDiy.net:

This is what I get:

None of the voltages change significantly when a disc is loaded.  The voltages at the bottom left are supposed to be 9V & 5V, according to the silkscreen on the board.  When a disc is inserted it turns part way around twice and stops.

HiFiDIY has been no help, and communication with them is difficult at best.  Their last message suggested the problem may be in the Philips transport unit, but I sincerely doubt that since they're built like tanks and I've had no end of problems with the hifidiy boards.  Does anyone out there know enough about these units to tell me what to check?  I have access to an oscilloscope, but I haven't used it because I don't know what to look for.  Thanks!