How can i remove optical driver from Acer Extensa 4230. Where cani get service manual for the same

This is actually simple to do. Take the battery out. Turn the laptop upside down. Look where the drive is located and then look for a single screw about 6 inches towards the mddle. You take this one screw out and the the drive will slide out. You push the new one in and put the screw back in and thats it.

The drive is about the size of a slice of toast. So if you look at where the drive is on the side imagine this "toast" and then look on the middle end of it. That one screw will be on that middle side but towards the front or back. This is one case where its harder to explain then it is to do. ;-] Now if nothing else you can take out one screw at a time near that middle edge and gently pull on the drive. If it doesn't come out then put it back in and try another. Once you have it out you will see how simple this is to do. There are no cable or connectors to attach so once it comes out as long as the new one is in the right place and the screw goes back in then you are good.