Lenovo THINKCENTRE 6019 - Manual (Page 101)

6. Pivot the drive bay assembly upward to gain access to the system board.
7. Locate the power-supply assembly. See “Computer components” on page 86.
8. Disconnect the power supply cables 1 and 2 from the system-board
connectors and from all drives.
9. Remove the power-supply cables from the cable clips and ties.
Chapter 8. Replacing FRUs - Desktop computers 95