CD-ROM Disc is Poorly Balanced
Poorly manufactured discs that are out-of-balance or discs with poorly distributed ink
on labeling will cause significant vibration at high speeds. Read errors may also occur.
Such out-of-balance conditions can also exist if the disc label adds more weight to
one area of the disc than another. Adhesive labels may also cause out-of-balance
conditions. Remove any adhesive labels on the label side of the disc and clean the
surface following instructions in Chapter 10. If there is no foreign substance on the
disc, you may wish to contact the disc manufacturer for a replacement.
In DOS or Windows (3.x, 95, NT), use Plextor Manager to reduce the speed of the
drive to a lower speed.
Symptom
•
Low Performance of CD-ROM Application Software
Possible Cause and Solution
Drive Automatically Set to Slower Throughput
Plextor’s drives are designed to automatically switch from top speed throughput
stepwise down to slower speeds when they encounter a defect or a scratch on
your disc. The drive then will continue to read data from the disc at the auto-
selected speed for a period of time. If no read errors are encountered, then the
drive spins up to the top speed possible without read errors. It is also possible that
the disc is dirty. Please refer to page 43 for instructions on how to clean your
CD-ROM disc.
Symptom
•
Disc Is Ejected After Being Inserted
•
ON/BUSY Light Flashes 4 Times
Possible Cause and Solution
CD Is Unreadable
Plextor’s drives are designed to automatically eject any unreadable CD. Please be
sure that the CD-ROM disc or audio CD is ‘‘label-side’’ up in the tray. If not, this
will cause the drive to eject the CD. A blank or incorrectly written CD-R (blank
media), a damaged, scratched, or otherwise unreadable CD will cause this same
symptom. Inserting a known good disc will correct this problem.
CHAPTER 12 ---- Troubleshooting
58
ULTRAPLEX OPERATION MANUAL
