6.Remove the lower drive cage by removing the thumb-screw and sliding the lower drive cage toward the rear of the computer.

7.Disconnect the cables attached to the drives in the lower drive cage and set the drive cage to the side.

8.Disconnect all cables connected to the system board. See “Identifying parts on the system board” on page 4.

9. Remove screws 1 through 7.

10.Slide the system board toward the front of the computer to disengage it from the mounting tabs and lift it out.

11.Place the defective system board next to the new system board on a clean, flat surface.

12.Remove all memory modules from the defective system board and install them in the same connector on the new system board. See “Replacing a memory module” on page 25. Return here after installing the memory modules on the new system board.

Chapter 2. Replacing hardware 13

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IBM 8137, 8138, 8131, 8123, 8124, 8122 manual Replacing hardware