Changing Jumper and Switch Settings

Changing a Jumper Setting

A jumper covers pins on a pin block and might be positioned to the left or to the right. The jumper setting depends on which pins are covered.

To change a jumper setting:

1.Lift the jumper straight up off the pin block.

2.Slide the jumper down over the correct pins.

Note:

1.Always grip the narrow ends of the jumper when you use a pair of fine needle-nosed pliers to remove or install a jumper. Gripping the wide sides of the jumper can damage contacts inside of the jumper, causing intermittent problems.

Do not squeeze the pliers or other tool that you use to remove a jumper, or you might bend or break the stake pins on the board.

2.Jumper positions for system-board configuration jumpers are described and illustrated in “Setting System-Board Configuration Jumpers” on page 292.

Setting SCSI ID Jumpers

If you install additional SCSI devices in the upper-left front bay, set their SCSI IDs so that they do not conflict with IDs used in the hot-swap bays.

Jumpers on the front of the SCSI backplanes define the SCSI IDs for hot-swap drives. See Table 14 on page 292 for the default SCSI IDs.

290PC Server 704 User's Handbook

Page 308
Image 308
IBM 704 manual Changing a Jumper Setting, Setting Scsi ID Jumpers