Tip & How-To about Computers & Internet
I've had my Lite-On LH-20A1S SATA connector optical drive for about three years, and in the past year or so it had become difficult to get the tray to open whether there was a disc in it or not. I had to push the button very hard and hold it for several seconds, releasing it, pushing it and doing this three or more times to get the tray to open. Then, in the past couple of months, closing the tray has become difficult, needing to push and hold the button very firmly. Even a paper clip would not open the tray, nor did using computer to "eject" to open the tray. I was about to look for a new optical drive to replace mine, but found a thread at forum that mentioned in Lite-On drives, the magnet that holds the spindle in place was too strong, which would prevent the tray from opening by prematurely wearing out the rubber belt. That person suggested putting a Duct tape padding or sticker on the inside of the puck (the plastic white disc that holds the magnet and makes direct contact with the spindle) would help reduce the strength of the magnet and make the tray open easily. Well, it did that, but the tape padding interfered with the spindle and caused a terrible whirring sound, making drive unable to play a disc. I figured the magnet had something to do with the problem, since Lite-On units are unique in using magnetic force to grab the spindle and lock the disc in place. I have a few Asus optical drives that do not have this feature.
Back to square one. Right idea, but wrong place to put the tape padding. I took unit out of case, opened it up and removed the Duct tape padding/sticker.
Here is what I did, making up my own descriptive names for the parts in question:
Remove optical drive from machine. No need to open unit up. Remove cover plate, these can be made of plastic, or on older units, of metal. With unit top side up, using sharp pocket knife, carefully pry around the cover plate (and label) to loosen the glue that holds it down, working knife in angled circular direction of plate. No need to go all way round, just enough to easily remove the contents: the white plastic puck.
Turn small metal twist cover in clockwise motion to unscrew it from plastic puck, being careful not to break off any of the three plastic tabs, as I had done the first time I unscrewed one (actually, I used a screwdriver to push one of the plastic tabs upright, thinking that was how it was held down, which broke it off). If you pay attention, you can easily see from the small twist cover that you unscrew it. Once lid is removed, you will see the 10mm metal magnet that is held magnetically to the twist cover. It has a hole in the centre. You can check magnetic strength with your screwdiver or pocket knife and find out just how strong Lite-On's magnet is. This magnet is what pulls the spindle up to secure the disc in place against the plastic puck, and if the magnet is too strong, it can stretch and prematurely wear the rubber belt as it refused to release the spindle. It can also cause the spindle to not fully pull away from puck when button is pressed to open tray or close tray, resulting in the spindle dragging along the inserted disc and scratching it. At least, this is what I believe happens. I'm not an engineer.
Next, double over a piece of Duct tape to make it two layers thick (sticky sides against each other) and measure and cut a 10mm or so circle. Remove the magnet from the small metal twist plate and use magnet as a pattern. Remember to replace and center the magnet back on the twist cover. You can adjust padding/sticker with scissors to make sure it will fit in the inner circle section of puck. Then with nail, poke a hole through the middle, making it large enough to fit over the centre post of puck. (I tried making a three layer circle padding, but it was too thick and wouldn't allow the magnet and twist cover to close down, so two layers is sufficient.) Use magnet and twist cover to depress the tape flat, then with counter clockwise motion, push thumb and secure the twist cover making sure the three tabs lock in their grooves. No need for glue in this project.
Place puck back on top of unit, and close the cover plate, pushing it down to secure it. If you need glue, then do so, but I didn't as the old glue was still sufficient to hold the plate in place.
Replace unit back in machine and test it.
Mine has been working as it should for two days now, whether I am in Linux or Windows XP. The button works as well as using "eject" from computer.
One person said replacing the belt worked, which they got at an electronics supply company. It makes sense that with the strong magnet used on these units, that the belt would wear prematurely. But this fixed it for me as I have no belts on hand, but do have Duct tape. I plan to replace the belt as soon as possible, though I still think choking down the magnet was a necessity. I have an Asus optical DVD/CD RW in the same case and it is the same age and has had no problem opening and closing the tray.
I was thinking another option would be to replace the magnet with something less magnetic. We have plenty of pliable magnets on our refrigerator, and wonder if making one to fit would work without the need of any diffuser padding.
(An update to say that I fixed a second one in such manner, a 2006 unit with IDE connector and it is working fine, too. Both units also play discs and I can burn from units.)
Posted by Leesa on
May 16, 2012 | Computers & Internet
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