I have a Plextor 716A with firmware version 1.11. Since a while the drive can not ride or write DVDs but works with CDs. I tried to run the DMA test but when I boot the machine pushing the Eject button the led blinks in amber but I can’t do anything.
Clean the drive/lens properly.
Welcome to myce!
A partial defect as you describe is usually a sign of the laser starting to fail or dirt on the lens.
Look here for how to clean the lens:
When you talk about the DMA Test I assume you mean the self-test? Here is how to do it properly (from the Manual):
"Using the PX-716A Self-Test Diagnostics
The PX-716A drive contains a set of self-test diagnostics that can help isolate trouble and determine if a problem is in the drive or elsewhere.
NOTE: Using the self-test diagnostics requires opening the computer and removing a cable from the drive, then replacing the cable at the end of the test. If you previously installed the PX-716A in your computer, you should have no fear of the simple procedures that are required. However, if youâ€™re are not comfortable with opening your PC and disconnecting cables, you may want to let someone with more experience handle this aspect of troubleshooting for you.
To perform the tests youâ€™ll need:
â€¢ Tools to remove the computerâ€™s cover
â€¢ An extra jumper
â€¢ A blank piece of Plextor-recommended DVD+R, DVD-R, or CD-R media. (See page 114 or visit our web site.) The self-test will write to this media, so you wonâ€™t be able to use this disc again. This tests three functions of the drive: writing at maximum speed, continuous playback at maximum speed, and random access.
To perform the self-test:
Turn the computerâ€™s power OFF, unplug it from its power source, and open the computer to gain access to the rear of the PX-716A drive. Typically, this involves loosening or removing several screws on the back panel of your computer and sliding off the cover. (See Figure 3 for an example.) CAUTION: Before you attempt to open your computer be sure to properly ground yourself by wearing an anti-static wristband. This will help prevent static damage to your computer system.
You should be able to see the back of the PX-716A drive connected to the ATAPI cable, power connector, and, optionally, an analog sound cable. NOTE: You may have to remove the drive from the computer to perform the next two steps.
Hold the ATAPI cable at or near the base of its connection to the PX-716A drive. Carefully remove the ATAPI cable from the drive by pulling the cable gently rearward.
Note the position of the mode jumper at the rear of the PX-716A. A jumper will be installed on either the CABLE SELECT, SLAVE, or MASTER position. Write down this jumper position. (Youâ€™ll need to replace the jumper after the test.) Then: ô€‚‰ If the jumper is on the MASTER position, move it to the SLAVE or CABLE SELECT position for this test. ô€‚‰ If the jumper is on the SLAVE or CABLE SELECT jumper, leave it in place. ô€‚‰ The position of the DMA jumper (on or off) doesnâ€™t matter. Donâ€™t change it.
Install an extra jumper so that both the CABLE SELECT and SLAVE positions are jumpered, as shown in Figure 54.
If you removed the drive for access to the cable and mode jumpers, slide it back into the computer and connect the power cable to the drive.
Replace the computerâ€™s cover and re-connect the computerâ€™s power cord to the power source. CAUTION: Turning on the computer power without first replacing the cover can be dangerous to the computerâ€™s components and also to you. Be aware of the danger of electric shock and do not touch any components inside the computer.
While pressing the eject button on the PX-716A, turn the computer power on. Continue to press the eject button. The LED indicator blinks green, then amber, and the tray ejects.
Insert a blank Plextor-recommended DVDÂ±R or CD-R disc. Be sure to use only media of the type recommended by Plextor. ô€‚‰ If the LED indicator blinks amber three times, the loaded disc is not a blank DVDÂ±R or CD-R disc. Remove the disc and insert a blank, Plextor-recommended DVDÂ±R or CD-R disc.
The drive begins the diagnostic routine. Upon completion of the diagnostic, you see the results:
ô€‚‰ If there was no problem, the disc is ejected automatically. ô€‚‰ If there was a problem, the disc is not ejected, and you see the LED indicator blink green. One green blink indicates a write or read error. Two green blinks indicate an initialization error.
If the disc was not ejected automatically, press the eject button to eject the disc.
Turn off the computer power.
Reset the mode jumper at the rear of the PX-716A to its original setting as noted in Step 4 above. Also, remove the extra jumper you installed.
Reconnect the IDE cable to the PX-716A drive. If you removed the drive to gain access to the cable or jumpers, replace the drive in the computer. Then replace the computer cover."