Install the following wires to the power supply (page 10-24 of Service Manual):

Red and black wires (PSU TB3) to connector TB3

Red and black wires (PSU TB2) to connector TB2

Blue, green, and brown wires from the AC mains panel to connector TB1

When installing, push the wires completely into the connectors.

No wires should be visible after being tightened at the terminal block.