How To Remove The Main Logic Board - Sun Microsystems Enterprise 250 Owner's Manual

How to Remove the Main Logic Board

Caution – This procedure must be performed by a qualified service-trained
maintenance provider. Persons who remove any of the outer panels to access this
equipment must observe all safety precautions and comply with skill level
requirements, certification, and all applicable local and national laws.
Before You Begin
Before you remove the main logic board, you must remove all removable
components from it, so that you can transfer them to the new main logic board after
you install it. Complete these tasks to remove the necessary components:
"How to Power Off the System" on page 26
"How to Remove the Side Access Panel" on page 31
"How to Avoid Electrostatic Discharge" on page 35
"How to Remove a Memory Module" on page 77
"How to Remove the NVRAM/TOD Module" on page 94
"How to Remove a CPU Module" on page 81
"How to Remove a PCI Card" on page 85
"How to Remove the SSP Paddle Card" on page 90
What to Do
1. Disconnect any external cables attached to the rear panel of the system.
Be sure to note where each cable attaches to the rear panel. See "Locating Rear Panel
Features" on page 7.
2. Disconnect the internal cables from the main logic board.
Press the tab on the cable connector to detach each cable.
a. Disconnect the two power cables at connectors J2902 and J2903.
b. Disconnect the two power sense cables at connectors J2901 and J4501.
c. Disconnect the SCSI backplane data cable at connector J1801.
72 Sun Enterprise 250 Server Owner's Guide • June 1998