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Old 19th November 2013, 12:18 PM   #19941
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by dwjames View Post
Have you tried swapping the DOS inputs and/or power supplies left to right and seeing if the noise changes channel?
Good idea but not very easy to do..... I am waiting for my scope and than I will be able to search better.
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Old 19th November 2013, 01:05 PM   #19942
marce is offline marce  United Kingdom
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Hope you've kept a wiring diagram
You know its on one channel, which narrow it down...
One thing that is done when these sort of problems appear is joining ground points together with some nice thick wire, start with areas of suspicion and spread out trying different combos, sometimes the noise will go giving you a clue where the problem is (going form area to area bypassing the star ground). On quite a few commercial boards (not just audio) you will often see a nice big empty hole with a decent ground connection, just waiting for some nice hook up wire!
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Old 20th November 2013, 06:04 AM   #19943
RCruz is offline RCruz  Switzerland
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All flying wires carry only AC (to the 10 psu's) and DC for the 12 regs.

All GND from the psu's go back to the star.

That is why I have so much wires.

All wires are disconnectable (gold connectors) and are tagged so I can take it apart.

I am now considering building an external psu with all the TX and rectifying boards.

It will take some time.... will report latter.

Now the output cap bypass I just did restored the marvellous spatiality I am used to in my other builds so at least I am enjoying it now
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Old 20th November 2013, 01:20 PM   #19944
marce is offline marce  United Kingdom
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Bit OT, but at the last clear-out of our attic it looks like my CD63, that I was saving for some future fun (the laser had gone!) has been binned by an over enthusiastic missis.
Good look with the fault finding
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Old 20th November 2013, 10:34 PM   #19945
dwjames is offline dwjames  England
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Aghhhhhh! I broke it!
Well, to be exact, it broke itsself. But at the end of a lovely evening's listening, my player is dead
I've got no display on the front whatsoever and the disc just spins faster and faster until I turn the whole thing off. It spins regardless of whether there's a disc in there or not. I've checked a few voltages and can't see an obvious issue.
Any pointers gratefully received....
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Old 20th November 2013, 11:25 PM   #19946
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I'd start by checking all the voltages you easily can while the player is still together, e.g. regulator in/out, CPU 5v supply, etc.

I also tend to gently press the top of the PCB while it's on to see if it affects the spinning of the disc at all. That's revealed the approximate location of a cracked trace several times.

After that, take the board out and check for continuity. It's been a while since I debugged something like this, but it might be your DAC clock...

Good luck. I'm sure you'll find it.
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Old 20th November 2013, 11:44 PM   #19947
dwjames is offline dwjames  England
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Thanks Ben. Pretty sure I had wildly spinning disc, but with display working when I had clock issues before. I've done a quick search and can see Rcruz had a similar issue where he'd lost power to the ÁCon. I'll give that a check tomorrow.
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Old 21st November 2013, 04:46 AM   #19948
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I encountered once a dead screen and the problem was found due to the defective voltage regulator. Change the voltage regulator and the screen came back normal. Check the voltage output of the regulators as a first step.
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Old 21st November 2013, 08:05 AM   #19949
dwjames is offline dwjames  England
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I've had a very quick check on my way out this morning and I'm getting 4.85v at pin 1 of the ÁCon which seems a little low to me. It's got it's own dedicated 7805 regulator so I can check/replace that easily. I wonder if the ÁCon chip's dead though...
For reference, here's what my player looks like these days
Click the image to open in full size.
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Old 21st November 2013, 06:35 PM   #19950
RCruz is offline RCruz  Switzerland
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Speed spinning might be due to a faulty driver chip... had to replace one once
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