Recorders and Players
Recorder Player Problems? Ask a Technician for Answers ASAP
Hi. The pro CD is indeed a better test for this but as long as it is not scratched too much.
First, does the sound come from the device itself or is in the sound of the headphone?
After checking in the service manual, i don't seem to see anything obvious that could cause this. It is obviously a defect in a component as it affected two device in a row. Without having the device on my test bench it is hard to see what can be bad. I still link you the service manual, it may be usefull in dissasembly if needed for the following. http://archivos.diagramas.mx/audio/D-SJ301 sm.pdf
The Sony site mention of the problem but does not give much info:
That said it give me a hint that it might be related to the the laser pickup trying to adjust (preventively to not have a sound buffer under-run). I don't see well how the spindle grabbing of the CD is from the diagram but often if one become dirty it become so asymetrically so the CD is no longer perfectly parallel to the spindle. Cleaning it with pure alchohol may help. Giving a clean of alchohol on the laser lens may also help (being a portable device it get in contact with lot more contaminent than a living room CD player).
Let me know if this clear the problem or reduce the occurence, if not we may look into other things.
It would sadly be cost prohibitive to send it to me but you may have a Sony authorized repairman in your area. As for if i repair that kind of thing, yes but i don't have any notes on that particular model. We se very few of those, they are rare as MP3 player where getting lot more versatile and cost competitive.
I never said it could be the CD. More the way the CD hold in the player. The way you used it should not matter much. The way the motor is always in the same manner, only the seeking head move. That particular model have an advanced anti shock system that buffer the sound in memory (almost like an mp3 player storing the music temporarly in RAM). The motors really seem to work, fine, the problem look to be related to having to much error in copying to that RAM so eventually it can't fill it up as fast as it play it to the headphone. That is why i suspect the lens or the spindle. It could also be the slider bars (those are two metalic bar that allow the laser head to go inward and outward of the CD. Those can become gummy and slow down the filling of the memory buffer (you can clean those the same way). Usually when someting work but work bad, it is fixable.