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Crackling noise on ADCOM gcd 575

psychoanima

New Member
Hello everyone!

I bought this old cd player because I heard great stories about 1541 dac, and this player in general.

Anyhow, playing some discs I noticed some random noises in the music, and they are getting more common from mid to the end of disc. These random noses are really hard to describe since I never heard something like it. I could maybe compare it with vinyl needle cracks, but more thin and short. Sometimes they are appearing once in 10 seconds, very subtle, but sometimes they can attack as a horde of noise lunatics, again depends which disc I am playing.

Now, i thought problem is in laser, so i bought new one, got it replacad, but these crackers are still inside cd player.

I tried turning laser pots on a board (i know, I shouldn't without proper measuring equipment) and i manage to reduce some noise by ear, but still can't remove all of them, so I assume neither focus calibration and other pots are able to remove this annoyance.

Any suggestions, is this beauty dying without cure?
 
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Random noises are probably random bit errors. Getting more common towards the end of the disc points to the laser tracking, rather than errors downstream of the data recovery (e.g. if it was a problem with the digital stream to the DAC, that would be independent of disc position).

What sort of tracking mechanism is it? Linear, or swingarm? If linear, have you cleaned & lubed the rails?
 
It is linear, and yes it's cleaned and lubed.

Additional information, I burn a copy of one audio CD (that was problematic) on empty Verbatim CD, and on that copy I didn't have any noise problem.


One electrician refuses to fix it because he found that someone was doing some sort of tweaking on this player. He couldn't explain what is it and even if it's connected to my problem, he only showed me this picture as his argument to not work on it:
348358225_1481128869368328_5932136649353188659_n.jpg
 
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