Question about Pioneer CDJ-500II CD Player

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Laser adjustment does not read some cdswell, glitching

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Clean the laser lens w/ pure alcohol(very lightly) on a swab and make sure the rails that the CD transport moves on are free of dust and hair.

Posted on Mar 03, 2009

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Player won't read disk. What can I do?

Does it make mechanical noise while it is trying to read a disc? That would indicate a laser out of adjustment trying to focus. Otherwise you may just need to clean the lens with some rubbing alcohol and a q-tip. Let it dry well before you fire it up again. Most player issues are due to a dirty lens and most disc style lens cleaners are only meant to be used as a maintenance item.

Feb 09, 2015 | Symphonic CD5800 CD Player

1 Answer


It sounds like a lazy laser...on the laser housing itself there is usually a yellowish plastic dial that you can get a small screwdriver into....temporarily you can usually adjust this slightly until cd reads but on the whole i would have the laser replaced..hope this helps.

Jun 27, 2011 | Wurlitzer Jukebox 1015 One More Time...

2 Answers

Row Jukebox 100B CD stops playing half way into a song. system error light is flashing on. I cleaned the lens, didn't help

It sounds like your laser lens may have or be in the process of kicking the bucket.
What you CAN do is adjust the POT on your lens...a fairly simple process if you can get at the lens assembly. Not so simple if you have to take everything apart to get to it.
Google "laser pot adjustment" and read up on how to do it.
If you aren't tech-savvy you may want to consider purchasing a new device or drive for your device.

May 04, 2011 | Audio Players & Recorders

1 Answer

My cd sounds like it is scratched. it is not

sounds like the laser assembly is going bad...when the laser gets weak it will not track properly and it makes a skipping scratchy kind of sound...there are adjustments inside the cd player but I don't recommend that you adjust them...refer servicing to qualified service personell. You need an oscilloscope to make these adjustments. A laser will cost anywhere from 40.00 to 150.00

Dec 18, 2010 | Sony MegaStorage CDP-CX455 400-Disc CD...

1 Answer

DIN UNLOCK on the display

The CD isn't reading the disk, so it reports "blank disk". It could be as simple as the CD laser lens having dust or lint on it, in which case you can use a CD cleaner disk (available at Walmart or Radio Shack, Best Buy, etc.). If that doesn't help, the second most common problem is that the laser lens is out of adjustment, and not focusing properly, thus not reading the CD. This can happen with slight wearing of mechanical parts, or any change in the detection circuity (aging of capacitors, etc.) This can be corrected, but it entails taking the unit apart and adjusting the CD lens on a trial and error basis (adjusting, then trying, until you get it right). Here's a web blog on the procedure, and it will clue you in on what you can try. If you don't feel like tackling it yourself, of course, you will have to have the unit serviced. Get an estimate first, since it's also possible that they will just replace parts, or possibly a circuit board, in the event that adjustment of the lens doesn't solve the problem. Here's the blog:
Good luck, and hope this helps!

Jul 22, 2010 | Teac CD-RW880 CD Player / Recorder

2 Answers

Player will not read cd . Cd will not spin

Without me seeing it, it usually cannot read the disc and is caused by a defective, or needs to be adjusted or cleaned, laser assembly as long as it is every cd put in it. It can also be the disc spinner motor. Either one of those is the most likely cause. :)

May 19, 2010 | Yamaha CDC-845 5-Disc CD Changer

1 Answer

What is opc

"OPC stands for Optimum Power Control (or Optimum Power Calibration,
depending on who you believe; the process is sometimes known as Dynamic
Power Control (DPC) or Direct Read During Write (DRDW)). Most CD-R units
do a power calibration test before writing to adjust the laser power to the
correct strength. Different brands of media and different recording speeds
require slightly different power levels. Too much power can create oversized
marks which can interfere with each other, and too little power can produce
undersized marks which, in extreme instances, can cause read failures.

The recorder reads a recommendation for the initial power level from the
Recommended Optimum Recording Power value from the ATIP (section (2-38))
on the disc. This is used as a starting point for a series of write tests
in the Power Calibration Area (PCA) of the disc.

Running OPC goes a step farther by actively monitoring the write process
and adjusting the laser power as needed. If the writer encounters dust or
fingerprints, the laser power can be increased to burn through the
obstacles. This is especially useful for discs that are moved around
between recording sessions, such as CD-RW discs or multisession CD-Rs."

See this:



Jan 25, 2010 | Philips CDR765 2-Disc CD Recorder

2 Answers

Is my laser unit needing replaced on my Technics SL-PD667.I load discs and press play but it skips and jumps have tried to clean lasr with a cd cleaner but this has not solved the problem.

Cleaning the laser as you rightly say will not solve your problem. I have a Technics SL-PS700 which although quite ancient by todays standards also had the same problem as yours I have however fixed it using the same principle I apply to DVD recorders, playstations, Xboxes.
The operating frequency of the laser is set to a usable level by the manufacturer and over time the power tends to reduce. Other than replacing the laser unit which can be expensive, an adjustment to the laser needs to be done.
I'd recommend you get hold of a service manual first but it may not be necessary. If you are happy to get your hands dirty and are confident enought ot open the player, You'll need to get to the underside of the laser unit which normally means the whole CD tray mechanism needs to removed.
Not as scary as it may sound as long as you A - make notes of how it all comes apart by writing down the disassembly steps or/and take photos of the stages.
Underneath the laser unit you should find what looks like a little screw. This is infact a potentiometer this controls the the power of the laser. A pot tool (plastic should be used to make the adjustment but if you are careful a small slotted screw driver will do. Turn the pot one eigth of a turn clockwise this will raise the power slightly. Now test a CD to see if it plays. I don't reassemble until I can get a disc to play Just avoid looking at the laser unless you want to damage your eyes. Normally on turn does the trick and the CD will play once more.
Some say this shortens the life of the laser but that is only true if it is over adjusted. The manufacturer builds in an adjustment factor to enable service engineers to do this. In a workshop environment an engineer would use an oscilloscope to visually check the frequency according to manufacturer guidelines but these lovely pieces of kit are beyond most of us cost wise. If you require more clarity let me know

Oct 23, 2009 | Technics SL-MC7 110-Disc CD Changer

1 Answer

Where is the location of laser adjustment for Aiwa

Did you try cleaning the lens?

Also, motor brushes and commutators oxydize with many hours of performance and may need to be raplaced (the hard way is to dismantle the motors and clean them) - faulty motors can also disturb laser behaviour and, whether you believe it or not, sometimes a dirty main power switch will also affect focusing (all i'm saying here is that adjusting the pots might only improve the situation temporarily).


3rq8 (Triarcuate)

Jul 18, 2009 | Audio Players & Recorders

1 Answer

Error message "DATA DISC"

No No No and No again this disc issue makes me laugh. Look lasers are sensitive but after a while the power output level decreases to the point where the disc may still be able to be read but recording/finalizing is impossible.
Hmmm, I think I may have to point people to a link on this site as I've answered this question many times. However, here we go. As I previously stated the power is down on your laser specifically the recording laser. A potentiometer adjustment is required but this necessitates the drive mechanism with laser to be removed from the player. If you feel happy to do this, with the drive removed look on the underside of the laser unit and you will see two potentiometers (2 crosscut screw like objects). I don't know the layout of your unit but it's normally the pot on the right that needs to be adjusted clockwise by an eigth of a turn which increases the power output thus solving the issue completely. There's always a little bit of play in these things so it is safe to do this. Good luck

Jul 12, 2009 | Sony RCD-W10 2-Disc CD Recorder

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