Jeff Matthews Posted October 29, 2005 Share Posted October 29, 2005 Okay, my CD-Player skips. I don't think it's due to vibration. It'll play fine at loud volumes.... but later in the CD, it skips.... like it's some sort of "fatigue" or something. Any way to treat this ailment? Quote Link to comment Share on other sites More sharing options...
DrWho Posted October 29, 2005 Share Posted October 29, 2005 often times a simple cleaning of the lense will fix most problems. You would do this very much like you would clean a tape head (a lil rubbing alcohol on a cue tip). You might also want to check that the motor that moves the lens is free of debris. I have mixed many a cd player by simply removing the gobs of hair that accumulate on the inside and gunk up the moving parts. Quote Link to comment Share on other sites More sharing options...
Jeff Matthews Posted October 29, 2005 Author Share Posted October 29, 2005 Dr. Who, good to see you again. Thanks for the reply. Is there something you insert like a CD that cleans, or do I take off the whole shroud and get to it that way? Quote Link to comment Share on other sites More sharing options...
DrWho Posted October 29, 2005 Share Posted October 29, 2005 Well they do sell CD cleaners where there are brushes on the underside of a disc that you put some goup on (and then play the CD on a certain track). I personally prefer to take the shroud off and do a manual cleaning that way you can get to all the other crap that embeds itself inside. If you're not comfortable doing this then by all means go the cleaner route. Quote Link to comment Share on other sites More sharing options...
Coytee Posted October 30, 2005 Share Posted October 30, 2005 Might I expand the question a touch... I've got a disk that plays fine in several players (pc or walkman type). When I put it into my stereo player it has a location on a certain track where it will just hang... almost like a record skipping but as I recall, it just kind of stops for few seconds... plays a truncated note... stops for bit... Memory tells me it will get through the 8 minute song but it will take 12 minutes to do so with 6 of those 12 minutes being this stop/go stuff. Knowing it was just a spot on the disk, I've cleaned the disk with a variety of things. Disk continues to play well in OTHER players and continues to have issues on this player. OTHER disks play fine in this unit by the way so it seems to be the particular disk and the disk player don't like each other. Thoughts? Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted October 30, 2005 Share Posted October 30, 2005 Might I expand the question a touch... I've got a disk that plays fine in several players (pc or walkman type). When I put it into my stereo player it has a location on a certain track where it will just hang... almost like a record skipping but as I recall, it just kind of stops for few seconds... plays a truncated note... stops for bit... Memory tells me it will get through the 8 minute song but it will take 12 minutes to do so with 6 of those 12 minutes being this stop/go stuff. Knowing it was just a spot on the disk, I've cleaned the disk with a variety of things. Disk continues to play well in OTHER players and continues to have issues on this player. OTHER disks play fine in this unit by the way so it seems to be the particular disk and the disk player don't like each other. Thoughts? It could be the disc itself has a flaw. All CD players have error correction circuitry built in and some are better than others at correcting for these flaws. I have held some CDs like you describe toward some light and have been able to see a flaw(like a little pin hole) in the CD metal structure itself. mike[] Quote Link to comment Share on other sites More sharing options...
fletcherkane Posted October 30, 2005 Share Posted October 30, 2005 My kids got a new dvd recently that would play fine in some players and not at all in others. It wasn't a DVDr . Upon closer inspection, the disc did actually have a flaw in the playing surface...a tiny littlle dimple. All the cheap players in my house just read the disc as an error. The nice player in my HT reads it just fine. The CD/DVD production process is pretty good, but not flawless. Quote Link to comment Share on other sites More sharing options...
DrWho Posted October 30, 2005 Share Posted October 30, 2005 Might I expand the question a touch... I've got a disk that plays fine in several players (pc or walkman type). When I put it into my stereo player it has a location on a certain track where it will just hang... almost like a record skipping but as I recall, it just kind of stops for few seconds... plays a truncated note... stops for bit... Memory tells me it will get through the 8 minute song but it will take 12 minutes to do so with 6 of those 12 minutes being this stop/go stuff. Knowing it was just a spot on the disk, I've cleaned the disk with a variety of things. Disk continues to play well in OTHER players and continues to have issues on this player. OTHER disks play fine in this unit by the way so it seems to be the particular disk and the disk player don't like each other. Thoughts? Sounds like a combination of a minor glitch in the CD and a dirty lense amplifying the problem. Then there are a few different types of error correction...some cd players will keep reading the same location until it succeeds. If the memory buffer runs out before it succeeds in reading the next bit of music, then it goes back to the front of the buffer and repeats the loop until it finally reads the disc. To keep the player out of an endless loop the manufacture makes the CD player try to go for the next bit after every failed attempt, so if you have a long enough section of failed bits, then then the player will end up pausing and replaying the buffer until it succeeds (in the meant time junk bits are getting stored and that's the reason for the odd blips of sound you hear). Other players will just ignore any flaws and keep track of the time internally and just keep trying to read ahead. If it fails, it just inserts a silence and moves on. The last type of correction involves some fancy algorithms to try and reconstruct the digital signal based on interpolation...basically trying to connect the dots with the analog wave form. If the disc is too far gone this ends up sounding really wierd, but it will play nonstop through the disc. And of course there are players that perform any combination of these 3 methods and it's really up to the manufacturer to determine what the target audience will find most suitable. So keeping that in mind, if your lense is slightly dirty and/or there are minor flaws on the CD, you can still expect different players to behave differently. Quote Link to comment Share on other sites More sharing options...
Agent Eagle Posted November 1, 2005 Share Posted November 1, 2005 If you are comfortable with taking the cover off, here is a suggestion.... I had an old Technics CD player, that would skip on low frequencies. Somewhere on the disc transport unit, there should be 4 phillips head adjustment screws. One is for tracking, one for laser intensity (focus), one is for error correction. You can experiment with adjusting them. I did on mine, and it never skipped again. In fact, sound quality, and stereo seperation seemed to improve.... Just a thought ! It worked for me..... Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted November 1, 2005 Share Posted November 1, 2005 I usually drop mine from a height of precisely one meter onto a marble slab. That usually fixes it. Michael Quote Link to comment Share on other sites More sharing options...
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