"Meat Plow" wrote in message
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On Wed, 09 Mar 2011 01:36:57 +0000, Arfa Daily wrote:

"Meat Plow" wrote in message
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On Tue, 08 Mar 2011 10:36:44 -0800, GARY wrote:

No error-code.

After the 3 discs are cycled over the lens, the display says "No
Disc".

You've got problems in the logic portion. If it were a laser problem
the disc would rotate and the sled would slide the laser block in and
out looking for a disc ID.

Often not the case, Meat. Many players will not start to spin the disc
up or move the laser down its slides, unless focus lock is obtained, The
movement of about an inch is often an attempt to move the disc to a
different spot to retry the initial focusing operation, in case the
original spot on the disc was dirty or damaged. This small movement of
the disc may be carried out just the once, or several times before it
gives up and declares there to be no disc ...

Just as a matter of interest, why has the OP started a new thread,
instead of continuing with his original, also called "Compact disc
doesn't spin" started two days ago ?

Arfa

I must be thinking of a DVD. Looking at this portable player with a
window to see the disk as soon as the lid is closed the disc rotates
and then the sled moves in and out. Been too long since I've worked on a
CD player to remember if they do the same I guess.



No, no. You're quite right. Some players do just go ahead and spin the disc
up regardless, but by far the most common scheme is to first home the laser,
which is usually just a little shuffle if it's already home, then to obtain
focus, and when that is achieved, spin up the disc and get the tracking
servo locked before finally starting to read data to extract the timing for
the spindle servo. Once all of that is acomplished, the TOC is read in.

Arfa