Http://diagramas.diagramasde.com/audio/HCD-ZX10D.pdf here's the manual for this model. I have the same problem, have'nt managed to turn off demo mode. If you figure it out let me know :-)
SOURCE: Sony LBT N455 - Hi
Although your device can handle up to 5 disks the cd laser lens that reads the disk is only one. So if this problem occurs only at these cds it's a disks problem. If it occurs on various disks try using a cd/dvd cleaner set, a wet one is better. Follow the instructions on the set. The main idea is to put one drip of the included liquid at the set (usually isopropyl alcohol) at a specific place (like small brush) on the disk surface and play this disk. This way the "brush" will clean up the laser lens and after that the cd/dvd player will be able to read the disks. BE CAREFULL not to put too much liquid on the "brush". In case you can, use a Q-tip with isopropyl alcohol to clean up the cd lens manually. In case this doesn't solve your problem, the cd player needs laser lens replacement by a technician.
In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, accept my solution.
Thanks and regards
Stelios
direct FixYa link: http://www.fixya.com/users/technical114
SOURCE: istruction manual for a sony
User manual is never hard thing to get over internet, just go to related manufacturer support website to get free copy.
Click Sony Support link to download required user manual free copy.
This is Sony Support link if you need any other model user manual.
I do not see any difficulty for that.
Thanks.
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