Cd tray remains open

CD/DVD players use a protocol;
Open tray. Insert disk. Tray switch tells mechacon that the tray is shut. Attempt to focus on disk.
If focus is acheived, then it will spin up and try to read the disk otherwise it will ask for a readable disk.
If the tray keeps opening, I would suspect the tray detect switch is malfunctioning, maybe the drive belt has stretched.

A slack pulley rubber may be the cause.This will cause the tray not to load fully and will not allow the open/close switch to make contact. However,this can only be fixed by a qualified technician.

check the close circuit switch inside the system. its maybe stuck, try to wiggle it a bit and it might work again.
the switch is at the end of the tray when it is closed, its a small black push botton swith.
be careful not to fry it when installing a new part

Do you mean the CD tray won't stay closed? If so check the simple things first. The button that you push to open and close the tray is actually a lever that pushes a much smaller button below it. Make sure that your eject button is not stuck down for some reason. Check your cd tray and the bay to make sure nothing got inside that is preventing the cd tray from closing all the way. I believe if something gets in the way the tray will automatically re-open. You can also take some compressed air and blow out the cd tray to remove any debris that may be blocking the tray from closing.
If none of the above simple steps work I believe it boils down to 2 things. 1. An object inside the case or tray that is preventing it from closing all the way or... 2. The eject button is stuck down.
If your comfortable with it you can take apart your xbox case and remove your CD/DVD player and ensure the button works properly. You can do a search on this site or youtube for instructions on how to take the case apart if needed. Once the case is apart the CD/DVD player is easily removed. You will then notice that the switch you press on the outside of the Xbox to open and close the CD/DVD tray is actually a lever that presses a much smaller switch directly on the front of the CD/DVD unit. You can then test your eject switch directly by pressing the button directly with a ball point pen or a pin. If the bay does not open and close properly at this point it may be necessary to replace the CD/DVD player and I do not know if it can be replaced or not. Hope this helps.

My unit closed immediately upon opening since like 1 day after the warranty ran out. It bothered me. I finally tore it apart and this fixed it.

Take the cover off. As you are facing the front of the player, the blue sensor switch that controls the tray will be on your left in the middle of the carousel. Push button to open tray and locate it as the tray opens. Grab the tray and also the carousel and hold them so you can see the little blue switch. Use a tiny screwdriver or toothpick or other slender device to "flick" the switch fully forward and backward several times. Let go of the tray and try the button. If it still closes immediately, repeat the flicking. Try it again.

I DO NOT think that problem related with CD cleaner
3 possibility here
1 The loading belt was lose it can not open fully to reach the switch open when the time limited was out as program design from system control it automatic close
2 The loading gear system out of position 1 tooth
3 Dry joints on switch open and close or connector from CD tray to system control intermittent contact
In any case it require a qualifier Tech from Panasonic to reset the timimg gear or service
I hope that give you some ideas if you need further info or service manual I am willing to help you out
Cheers

There might be something jamed or lodged in the CD-ROM compartment which would be preventing it to close all the way so it wants to stay open.Hope this helps =)

hi, there must be a disk previously inserted which has stuck in the tray or something, open the cover and check if anything is preventing the tray from ejecting.. let me knoiw

Sounds like the tray position switch has gone wrong.

If you sure that the system supports the disc's format.. And it won't play other discs... try to clean the CD lens. If it wont help and you're NOT still under warranty you should at least open the system and look for Problems with the door opening/closing: Steps: 1. Make sure the drawer-loading belt is still tight and elastic. If not, it can be replaced with a belt obtained from an electronic-parts supplier. The replacement should be of equal or slightly greater thickness and should fit snugly but not so tightly that it strains the motor. 2. Check for broken or loose gears and have them replaced. 3. Check for obvious sources of contamination such as pet hair or foreign objects that are preventing smooth operation of moving parts. Small children have a habit of inserting items into CD players. 4. Use electronics-grade contact cleaner to clean the door-position contacts.