Introduction

Replacing PathBuilder S24x, 26x, and 27x Switch Motherboard

Introduction	You must first remove all the expansion cards in order to gain access to the
	motherboard.

Removing the Perform these steps to remove the motherboard:

Step		Action

1	Verify that the power is OFF by removing the power cord.

2	Remove the unit’s top cover (refer to Figure 4-1).

3	Remove the support bar from the chassis.

4	Remove all cables connected to expansion cards and remove all
	expansion cards.

5	Disconnect the ribbon cable connecting the LED display card to the
	motherboard at the motherboard end.

6	Disconnect all cables connecting ports 1, 2, 3, 4, and 6 to the
	motherboard.
		Note


	All cable connectors are keyed to ensure proper connection.

7	Disconnect the two power supply cables.

8	On the right side of the unit (toward the backplane):
		• Remove the three retaining screws (Figure 4-6).
		• Swing the motherboard out and away from the chassis.
		• Lift the assembly up and away from its hinges.

4-12	Maintenance

3Com S27x, S26x Replacing PathBuilder S24x, 26x, and 27x Switch Motherboard, Introduction