Unsolder the four wires marked with No.1 yellow marker.

Unsolder the four wires marked with No.2 marker.

Unsolder the date cable with three contacts marked with No.3 marker.

Unsolder the lens cable with three contacts marked with No.4 marker.

Unsolder the button cable with three contacts (this machine may have been repaired in the past and used flying wires) marked with No.5 marker.