![]() They pass the digital audio information on to the receiver, which then decodes it. DTS compatible All DVD players are DTS compatible.Again, this feature is not necessary if you have a receiver with a DTS decoder. DTS decoder This feature allows the DVD player to decode the DTS information from a DVD and convert it to six separate analog channels.This feature is not necessary if you have a Dolby Digital receiver, which has a digital input that carries all of the audio information. Dolby Digital decoder This feature allows the DVD player to decode the Dolby Digital information from a DVD and convert it to six separate analog channels.This allows the player to transition quickly from one layer to the next, without a delay in data output, because it doesn't have to move the laser back to the center of the disc to read the next layer. So, as the laser moves outward, the spindle motor must slow the spinning of the DVD so that the bumps travel past the laser at a constant speed, and the data comes off the disc at a constant rate.Īn interesting thing to note is that if a DVD has a second layer, the start of that layer's data track can be at the outside of the disc instead of the inside. This happens because the linear, or tangential, speed of the bumps is equal to the radius times the speed at which the disc is revolving. As the laser moves outward from the center of the disc, the bumps move past the laser at an increasing speed. As the DVD is played, the tracking system has to move the laser continually outward. This centering is the job of the tracking system. The hardest part of reading a DVD is keeping the laser beam centered on the data track. The electronics in the drive interpret the changes in reflectivity in order to read the bits that make up the bytes. The bumps reflect light differently than the "lands," the flat areas of the disc, and the opto-electronic sensor detects that change in reflectivity. The laser beam passes through the polycarbonate layer, bounces off the reflective layer behind it and hits an opto-electronic device, which detects changes in light. The laser can focus either on the semi-transparent reflective material behind the closest layer, or, in the case of a double-layer disc, through this layer and onto the reflective material behind the inner layer. Get a magnet off your frig and try it, it may work.To work properly, the DVD player must focus the laser on the track of bumps. But like many here don't want to spend money to repair it correctly, may cost more to fix it then buy a new or used one. Besides I have been using another exact DVD model for several years and only created one (1) coaster in over 300 DVD/CD media's. Most people already have a home magnet to try out this fix, the one I used cost less than $2 and was 2X stronger then needed. So save a DVD's life, don't throw away a salvageable, fixable DVD if it can still perform after a jury rig fix. But you also have one last choice to keep your drive working, like try a great jury rig fix I proposed herein. Fix it correctly (very expensive), Fix it yourself (cheaply) or maybe just throw it away. The extra magnet does not affect the read/write abilities but I can not say what it does to the overall longevity and belt ware using this drive fix. When final trial and error positioning is found to be positioned correctly and working reliably, add a strip of tape to hold magnet to top drive plate permanently. ![]() Try both magnetic poles on your magnet but not sure if it matters any. The door open/close trey click sounds also changes from strong to weak to a perceived perfect sound (strong open close sound). It never can be in the center of the DVD, fouls up the spindle lift. Trial and error positioning is required to get the best trey open/close results. My magnet is positioned just off center near the front of my DVD at about the just right of the 6 o'clock position looking at front of DVD. By positioning the magnet off center on top of your drive you can alter the internal DVD's magnet field so it can help free up a sticking DVD trey that won't open the trey reliably. My jury rig fix is real simple and easy to do if you can get a small flat magnet (I used a 1 inch Rare Earth Neodymium magnet) but other magnets may work equally well. Someone else posted that quick fix and it works somewhat. I recently bought a used LiteOn Lightscribe DVD/CD iHAS424-98ĭVD/CD with a sticking trey door.that won't open reliably but does open often but not reliable with a blank DVD media inserted in drive trey. ![]() I have a work around or what we used to call a "jury rig fix" for this problem. I'm an old retired aerospace engineer and not an expert on DVD recorders.
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