Notes on the Troubleshooting and Repair of Compact Disc Players and. CDROM Drives. Copyright . This notice is included in its entirety at the beginning. There is no charge except to cover the costs of copying. Bigelow. covering everything from the DVD format to installing and using a DVDROM. PC. For commercial or professional audio recording, the.
Hz. followed by analog- to- digital conversion, usually at a sampling rate of 4. K. samples/second for each stereo channel. The resulting data stream is then. All mixing and pre- mastering.
Finally, the data is converted to a. Eight- to- Fourteen modulation (EFM). All based on the reflection of a fraction of a m. W of. invisible laser light!
This way, any abrasive dust moves in the. Therefore, use the same care. This does not tend to be a problem on commercial discs but if the. Some. This is different. The cleaner he was pushing was a little brush attached to. CD that brushed off the lens as it played.
Supposedly, he uses a pencil- type. Obviously, there are dangers in using fire on. The drawer switch may be dirty. The lens. is suspended by a voice coil actuated positioner which is relatively.
A small tweak to this may fix a marginal spindle problem. It is usually. mounted by 3 long screws (one of which may have a grounding doodad - don't. Exceptions to this are if the player. Playability problems are most often. That said, if the player gets heavy use, it is by no means. A further test that you can run is to try. CDs. If these play without.
Access is usually available once the optical block has. The lens should be cleaned carefully with a. Q- Tip) moistened (not wet) with electronics grade isopropyl.
The lens suspension is fairly delicate, so don't be 'brutal' with. When the alcohol has evaporated, polish the lens with. Now turn on the unit and see if the cd goes back into the. If it does not, look for a reset button on the changer.
It will be. a tiny hole near the eject button that requires a paper clip or toothpick to. Try pushing this with the magazine. If you do not see a reset switch on the changer look for one on. If. all of this does not work, the changer will have to be disassembled for the.
CD to be removed. If the unit is under warranty, take it back so as not to. This tells the system control micro that it can go ahead and start the. TOC read sequence. Next, the sled motor will normally be driven back and.
There is a leaf. switch that is pressed by the laser assembly to tell the micro that it is. The system control micro then turns on the laser. At this point, what. Usually, the player will start the focus. If all is well, the laser should obtain focus within one up- down. This. should result in the spindle and tracking servos being turned on, and the.
Once the tracking servo has. TOC will be read. When this has happened. Once they have. happened successfully, and their servos are locked, the spindle servo will. This sequence of events results in a quicker TOC read from a.
Instead. they rotate the disc just a bit, and try again, in case there was a jammy. This may repeat several times. Try watching carefully how the deck responds when there is no. If it seems totally inert, try opening and closing the tray a. Try to get it. into a position where you can see what the laser is doing under the disc. If. it does run up OK, watch and note the sequence of events, then try opening. Also, vice. versa.
If you see the laser shuffle take place when it does work OK, but. If nothing appears to fundamentally change up to the. The Philips ones. All of this assumes that it is not one of the early. Philips radial arm decks, of course..
It is a byproduct of the focus and tracking servos. Pioneer magazine type changers). If it has. separate D/As, then one of these would also be suspect. Gieszczykiewicz (filipg@repairfaq. There's an area of the CD- R disc used specifically to . Since all disks have different needs (gold versus blue/green dye, for. If you laser has lost its.
DO have a very finite life) which may be due to end- of- life. OR dust on the lens (always consider a lens and any other accessible optics. FAIL this write- test and you will get what you are. I would try a different color dye CD- R disc and see if there is one. Likely causes. The CD- R burner or software is producing discs whose layout is slightly. A firmware or software upgrade may help if available. Remover De Virus Da Microsoft Downloads. Try a different. brand and color.
Usually. 2. X write speed gives the best pit structure on the widest variety of. Have you tried an OPC test to see if it is.
Of the dozens of CD- R's I own, these. For. that reason I believe it is not the player but the discs that are . Levin (levinjb@gte. If this were the problem it would be highly dependent on the CD's speed of. Don't use seriously warped. Not bad considering most haven't.
You will never be able to get back. Stick your ear down. Now carefully swing the focus bias pot either side of centre, and. Set the pot to this point, and. The tracking balance pot can be set in the same way, but you have.
Set the tracking gain and focus gain pots. The seller. claimed that it was broken but I could find nothing wrong!
Gieszczykiewicz (filipg@repairfaq. I use something as simple as a pencil. Start the motor going and put the pencil. When you hear the first tiny .
This is the place you want to. What looks like an adjustment. Turn it like a pot. Learned this one the hard way! If the adjustment is off, the size. Re- adjust a bit to one side or the other. Some discs may work better.
It was a white nylon screw which jammed the underside of the. Ok, I thought, just a cd- player. Well, I sure got a surprise.
I heard something's gone loose somewhere into. I noticed the lens on the pickup had popped out. I spoke to. the owner and he told me to change the entire pickup, as he didn't wanted. Said and done. The new pickup were easily changed. Time for the first test.
I suspected nice music. I could hear was: Sccchhh. What the heck! It didn't even recognize my. Adobe Acrobat How To Delete Object Anchor here. CD! The display showed all zeros. I started to check for bad.
Didn't find any. Didn't find anything unusual. Until I got a tip (from here) that they solder a jumper on. I adjusted it for a proper position. Testing again.. After adjusting the grating, I made the player able to.
CD's again and even play them! So, be awake when changing a.
Pioneer pickup, cause they'll not make it easy for you! There are at least 2 service bulletins.
Both these items cure this problem. Seems to be a. disc weight/thickness/density problem. I'm not. sure it this applies to all application of the KSS- 2. A or not. Zacharias.). The vibration from the spindle motor sets up a. You can see it in the focus error and tracking.
Lowering the tracking or focus gain a bit can help also. RTV where the spindle motor contacts the. BD board. What should happen is the CD will not spin, but the laser pickup.
CD. Check for continuity on each ICP. PCB just below the CD ROM ribbon cable. They. will have a 1. The one labeled as 1. But, insert a. disk and it does not seem to want to read the TOC. I use a mixture of tri- flow and graphite.
The symptoms are. FMV (full motion video) intro sequences and. If. you set the bias level on wiper of the Pot to around 1. CD loading that is . Now adjust the gain.
FMV sequence until it stops reading at one extreme. Regrease the rails using . These must be replaced. Cleaning is a very short term cure. While there are. many variations on the construction of optical pickups even from the same. Use an IR detector for. Repair is not really possible.
Once you have exercised the first coil, switch. Not often, but it does happen. Covington (mcovingt@ai.
The way I explain digital recording to people is this. Digital recording is like hiring somebody to type a paper for you, from a. Such filters are are possible but. Hz since the filter response needs to go from 1 to 0 within a. Hz). For example. A string of 1. 00. Because everything is defined by the designer (digitally), very.
Personally. I like to stay away from 1- bit D/A converters, but the last time I listened. D/A is about two or three years ago. I thought they sounded a.