Hi Innogen,

You can download the service manual and documentation for the Inspiron 7520 from the link below.

http://dell.to/QNNWOw

Please reply for any further questions.

Hi Innogen,

The manuals are the same for Inspiron 14R, 15R and 15R SE. You can alternatively, click on the below link, click on the tab "Select a different product" and enter the service tag of your system.
http://dell.to/Pj6s30 

The differences between the 15R and the 15R SE are as follows, excluding these the features are exactly same in both systems.

If you are still having any difficulty and want information on any specific hardware, you can let me know and I will definitely help you out.
Please reply for any further questions. 

The differences between the 15R and the 15R SE are as follows, excluding these the features are exactly same in both systems.

Thanks Abhishek for the clarification.

Could you provide the URL to the comparison table? The table that you copied and pasted here is too blurry for me to make out the words.

Thanks, Abhishek, for your help.

Hi Innogen,

Please double click on the picture, it will enlarge to the original size. I apologize for not being able to provide the URL as it's not an internet URL.
Please reply for any further questions.