IBM 6643 - Manual (Page 38)

1. Remove the rear bucket housing, see “Rear bucket housing (rear cover)
removal” on page 21.
2. Remove the four power inverter board cover screws. Use the tamper resistant
screw driver, IBM part number 19K3624, to remove these screws.
3. Disconnect the two end cables and the LCD cable from the power inverter
board.
4. Remove the two screws from the power inverter board.
30 Hardware Maintenance Manual