Squealing CD player?

[amacks]

any ideas on what might make the transport of a Sony CDP-C215 cd player squeal when trying to spin-up the CD to read the lead-in? It just started recently and now cannot play CDs at all. The noise sounds like a beld slipping, but I think that the motor is directly coupled to the spindle...
Aaron

[Netlist]

Aaron
It's hard to tell from here what the error might be but one of the most common problems with that player is the flex cable. Sony part nr.: 153589211
The squealing could be a faulty adjusted disk table as well.

/Hugo

[amacks]

It's definately a mechaincal sound, makes it without an amp and louder with the cover off. What would I look for if the table was off allignment?
Aaron

[amacks]

So I did some testing, would the machine being not level cause such a sound? It was about 1cm down on the right side(looking at the face)?
Aaron

[amacks]

With the machine perfectly level, the problem is still there. It sounds like perhaps the motor that drives the laser head is slipping?
Aaron

[Netlist]

Aaron
Like I said it's hard to tell from here.
I have the impression that your skills are not high enough to tackle this problem. No offence whatsoever of course. I could be wrong.
Did you open the player? When looking at the transport you should be able to see what happens and with some experience you would probably recognize the sound it makes and where it comes from.
I would suggest taking it to a service man and let him have a look at it.
A misaligned disk platter happens now and then, but not that often. On top of the spindle motor, that is the motor that makes your disk spin and usually is underneath the disk, there is a platter that holds the disk. When closing the tray, another platter comes on top of the disk, clamping the disk between the two platters. When the clamping force is gone for different reasons, the motor tries to spin the disk but the disk just slips between the platters. That could be the squealing you hear.

http://www.playvectrex.com/projex/ed...tor_n_disk.jpg

/Hugo

[amacks]

From looking at the transport, when it loads a CD, it seems that the spinning motor is fine, it spins-up and keeps the correct speed. From the information given by the display, which is variable, it seems that the motor that drives the laser is not always moving that properly. Sometimes it plays fine for a while and then looses the ability to progress across the disc, sometimes it can't even read the TOC.
I'm a watchmaker by partial trade, so if it is a mechanical problem, I'm pretty confident that I can do it...if it was an electrical problem more complex than soldering an obviously broken connection, I'd not bother to try myself

[johnnyx]

It could be a broken tooth on the rack that the sled motor uses to scan the laser across the disc. I've had this, and didn't bother to try to fix it. It was on a portable, and must have been knocked or abused in some way. They are so cheap now. Yours may be worth fixing though. You'd probably need a new laser assembly; they don't sell the gear parts seperately. They usually have two toothed sections, with a spring to keep them tight, which eliminates backlash.

Good luck

[Magura]

A simple way to check if its the disc that slips would be to GENTLY place a finger on the disc, does that change the sound of the squeal?

Magura

[Netlist]

Originally posted by amacks
Sometimes it plays fine for a while and then looses the ability to progress across the disc, sometimes it can't even read the TOC.
I'm a watchmaker by partial trade

This certainly indicates that a broken (don't try to find where it's broken) flex cable could be the culprit.
That is the cable connecting the laser unit with the board.
How funny, years ago I was a watchmaker too, my father was and when he died I played around with his tools for many more years. I quit and started repairing electronics...

/Hugo