Next to impossible?

Sniper82

Lifer
Feb 6, 2000
16,517
0
76
I have a Creative 12x40 DVD-Rom and the laser pod(I guess thats right) is out of alignment. There are 2 small screws next to each other on the laser lens. I know this is the problem because it did read DVD's just fine but had seeking problems with CD's. Well I took it apart and started messing with each(I know I ain't bright) and now it won't read either at all. I know this is most likely unfixable but when both screws are tightend is there maybe a certain degree I can turn them? Like a complete 360 turn or does anyone know the exact degree the screw needs to be turned?

I am pretty sure one is for DVD's and the other for CD. Anyone have any info or should I just toss it in the trash?
 

Evadman

Administrator Emeritus<br>Elite Member
Feb 18, 2001
30,990
5
81
Without the tool they use when they are alligned at the factory with, I think you have a nice door stop. Sorry.
 

JustinLerner

Senior member
Mar 15, 2002
425
0
0


<< I have a Creative 12x40 DVD-Rom and the laser pod(I guess thats right) is out of alignment. There are 2 small screws next to each other on the laser lens. I know this is the problem because it did read DVD's just fine but had seeking problems with CD's. Well I took it apart and started messing with each(I know I ain't bright) and now it won't read either at all. I know this is most likely unfixable but when both screws are tightend is there maybe a certain degree I can turn them? Like a complete 360 turn or does anyone know the exact degree the screw needs to be turned?

I am pretty sure one is for DVD's and the other for CD. Anyone have any info or should I just toss it in the trash?
>>

Certain adjustments need the right equipment and this is one that doesn't seem likely to be readjusted properly by trial and error. Although it can be fun on an expendable piece of equipment to note the position of the screw for adjusting (mark it with whiteout and the corresponding slot where the screw originated), then play with it (note the number of turns/partial turns and revolutions so you can put it back the way it was). But really, this type of adjustment is one that needs more sophisticated testing and monitoring equipment that t&e.

Normally, I too might have thought the different laser wavelenghts for CD or DVD media would correlate your problem to a CD only lazer/optical problem, but an older self-help book here says otherwise.
Improper search is usually caused by the "tracking-servo, kick-pulse, and feed-motor circuits". So if it read the CD (like an audio CD), but had problems playing games from CD, the optical laser was ok, but something in the CD search control circuits (which probably operate with different speed stepping), was the likely problem, maybe.
 

MassiveUnit

Member
Apr 14, 2002
30
0
0
You have a nice doorstop because you probably made the laser out of focus. The drive works on the principal of thin film refraction, so if you change the alignment of the lens that focusses the laser or the angle that the laser makes incidence with the media, the circuitry won't be able to pick up the refracted laser light correctly and will simply not read your disk. The post about the drive control circuits being messed up is proabably correct, since the track spacings in DVDs and CDs are different.