[net.audio] CD Mistracking on damaged discs

labelle@hplabsc.UUCP (WB6YZZ La Belle) (02/14/85)

        Has anyone had mis-tracking problems with their cd player?

 If so, what were the surrounding details? On my player, a TEAC PD-11,
 I've come across two discs which mistracked. The first had a 64th inch
 deep 32nd inch wide "gouge" which spiralled into the last "cut" on the
 disc. The player hangs up in the "groove" much like a record. The second
 disc could best be described as having a frosted splotch about 1/8 inch
 diameter. When mistracking first occurs, it plays each track two or three
 times before going on; finally hanging up indefinitely.

  An early SONY unit got hung up earlier from smaller scratches on said
 second disc, but a later SONY model performed as the TEAC on the same disc.
 A MAGNAVOX apparently played right through the same blemish! Early theory
 is that the "faster" the servo-mechanism, the more likely the unit will
 mistrack. The MAGNAVOX was very slow in aligning to a given track.
 
  Anyone else had any similar experiences, and or solutions? Polishing out
 the defects has not been tried yet, nor has anyone attempted to slow down
 the response time of the faster players.

                    GEORGE

stumpf@homxa.UUCP (P.STUMPF) (02/15/85)

I've had the frosted splotch one one disk, and a second disk that
wouldn't load at all.
A friend had a splotch on a disk.
Both disks mistracked by locking into a repeat mode, and even
backing up in time when advanced past the spot.
These three problems were all on London disks.
We returned the disks, rather than try to polish/correct the
problem.
-- 
Pete Stumpf ..!ihnp4!homxa!stumpf
US MAIL  AT&T-Labs Room WB 1L-331/Crawford Corners Road/Holmdel,NJ 07733
Phone 201-870-7368

ben@moncol.UUCP (Bennett Broder) (02/15/85)

Yes, I have one disc that gives my CD player problems.  It is a
recording of the Thompson Twins, 'Into the Gap'.  At a point about
3 minutes into the fourth cut, there is a 1 second period that
my player almost mutes. (It sounds like the kind of mistracking one
would get on an LP if the tracking force was too light).  The
curious part of this is that there is no visible damage to the CD,
and my dad, who has the identical player (Revox B225), can play
the disk without incident.  I am wondering whether I should send
my player back to Revox to have the error correction facilities
checked out....
                               Ben Broder
                               ..vax135!petsd!moncol!ben
                               ..princeton!moncol!ben