The PX-708UF contains a set of self-test diagnostics that can help isolate trouble and determine if a problem is in the drive or elsewhere.
What You'll Need
To perform the tests you'll need a blank piece of Plextor-recommended DVD+R, DVD-R, or CD-R media The self-test will write to this media, so you won't be able to use this disc again. The recommended disc list is available here:
http://www.plextoramericas.com/index.php/forum/11-general-media-discussion/1021-px-708a-recommended-media
Performing the Self-Test
This tests three functions of the drive: writing at maximum speed, continuous playback at maximum speed, and random access.
To perform the CD write/read test:
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Unplug the USB or FireWire cable from the rear of the Plextor PX-708UF drive.
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Set the PX-708UF drive's power switch to OFF (so the "0" is depressed).
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Slide the SELF TEST switch to the left (ON) position. Use a pen point, paper clip, or other similar object.
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While pressing the eject button, set the PX-708UF's power switch to ON (the "1" is depressed). The front-panel disc/busy indicator blinks green and amber, and the disc tray opens.
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Insert a blank Plextor-certified DVD+R, DVD-R, or CD-R disc. Be sure to use only media of the type recommended by Plextor. Then close the disc tray.
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If the disc/busy indicator blinks amber three times, the loaded disc is not a blank DVD+R, DVD-R, or CD-R disc. Remove the disc and insert a blank, Plextor-certified recordable disc.
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The drive begins the diagnostic routine. Upon completion of the diagnostic, you see the results:
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If there was no problem, the disc is ejected automatically. (That is, the disc tray opens, allowing you to remove the disc.)
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If the disc was not ejected automatically, press the eject button to eject the disc.
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Turn the PX-708UF power switch to OFF, and set the self-test switch to the right (OFF) position.
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Turn the PX-708UF's power switch to ON (so the "1" is depressed).
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Reconnect the USB or FireWire cable from your PX-708UF drive to the computer.
What the Self-Test Results Indicate
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If the drive fails the self-test, in some cases the problem may be caused by the media. Try the self-test again using a different brand of DVD±R or CD-R media; if the drive passes the self-test this time, the drive is OK.