Thanks for the picture. There are two shoulders on the cable connector that provide a place to push on to remove the connector. I'm assuming it's similar to the one used on the S400C in that being taped down it almost certainly doesn't have any kind of latch.
[image|2664198]
Take a couple of spudgers and place one at each point of the arrow and push them both evenly in the direction of the arrows. It should simply slide out - it may take a little bit of force; I know the S400C does.