Hi Martin

Unusual after recapping the servo board.

maybe the issue is to search somewhere else.

Have you tried some other CD´s?

Did you touch any trimmers on the servo board?

Did you measure the laser current as in the service manual discribed?

Kind regards

Christian

Thanks for your reply!

My guess is that this is not laser related at all. It tracks records just fine. I can search and skip tracks and it sounds fine at first. It sounds almost as if I had a radio with no channel tuned in and slowly mixing it in with the CD sound to the point where it takes over completely over the course of 30 seconds or so. And increasingly, the CD sound becomes distorted as well.

Can it still be a laser related thing you think?

No components have been touched except the replaced capacitors.

I have not measured anything related to the CD player.

Maybe something on the decoder PCB?

When the static noise has started, I can also hear a quiet "pop" when changing tracks and when pressing Stop, I can hear that the part of the noise is fluctuating at the same speed as the CD is rotating, if you know what I mean. It changes depending on which track I play/how quick the motor operates.

Can this be of any help indicating what part of the decoder board might be the problem?

It takes a few minutes before the noise starts, so I guess it is related to the temperature of the components somehow. The ICs are quite hot to touch. I can only barely keep the upper side of my finger on them. Is that normal?

I have inspected the board for solder cracks or cold solder joints and only found one that was only slightly suspicious. I reflowed it just to be certain.

Wires from CD to decoder board?

Hi Martin

If it' s possible for you please try to measure the laser current regarding to the service manual.

If it's out of specs ( 50mV) try to adjust with the related trimmer, but very carefully because the adjustment is very sensitive.

Kind regards

Christian

I wouldn't adjust anything. It seems to track fine. I don't think it's a laser-related problem.
Check for cracked solder joints (depending on drive version) at the voltage regulators on the decoder board and
at the large filter capacitors in the power supply - and also the relay in the power supply and (again depending on version) at the small relay board
in front of the decoder board.

Martin  

Thanks for your replies,

@Orava - I will check the wires. But since it always sounds good when I start to listen and also if I take a minute break after hearing the static, it sounds fine again for a while I am not sure if it could be a cable problem?

@Dillen - I don't see anything suspicous on the voltage regulators but I can certainly reflow them just to be sure! I will inspect the relays as well, though they are working well it seems.

Also, are any of the large filter capacitors in the power supply used only for this board (since I notice no problems on any other source)? Or can it be that this board draws more current than the others (which the warm ICs would suggest) and therefore puts a larger strain on the capacitors and traces in the power supply chain?

Thanks @TheTinman, I will try to find some spray and do some testing!

It was unfortunately not enough to use a heatsink, so I am now looking for a working TDA1541A chip to replace mine with.

If anyone have one for sale, please let me know! 🙂