IBM B50 manual No Go to -4 on YES Go to -5 on

Step 1520-3

1.Unplug the power cord from the server.

2.Disconnect all external cables (parallel, serial 1, serial 2, keyboard, mouse, AUI/RJ45 ethernet, SCSI, and so on).

3.Remove the server from the rack, as described in “Removing the Cover” on page 7-3.

4.Record the slot numbers of the PCI adapters. Label and record the location of any cables attached to the adapters. Disconnect any cables attached to the adapters and remove all the adapters.

5.Remove all the memory modules.

6.Remove the riser card from the system board, as described in “Riser Card” on page 7-11.

7.Unplug the SCSI cables from the system board.

8.Unplug the diskette drive signal cable and diskette drive power cable from the system board.

9.Unplug the power cables from all the SCSI devices.

10.Unplug the internal serial port and Ethernet cable from the system board.

11.Unplug the cooling fan power connectors.

12.Unplug the speaker.

Note: Do not disconnect the power-on LED or the power switch.

13.Plug the power cord into the server.

14.Turn on the power.

Does the fan in the power supply turn on and the power LED come on and stay on?

NO Go to “Step 1520-4” on page 2-15.

YES Go to “Step 1520-5” on page 2-16.

2-147046 Model B50 Service Guide