Pfaff Tiptronic 6270 Not Sewing?

My machine was sewing fine till yesterday. But now when I switch it on, the display and other LEDs are not functioning. However, the machine bulb is working. Someone suggested to switch off the machine and put it on after 10 secs. The status is the same. It looks like a fuse has blown.

How do I open the machine and replace the 3A fuse. I need the procedure and service manual. I have searched on the Internet extensively for repair instructions, but I could not find anything for my machine.