Service manual

10-24 Sun Ultra 2 Series Service Manual • July 1996
10.6.2 Replacing a Motherboard
Caution – Use proper ESD grounding techniques when handling components. Wear
an antistatic wrist strap and use an ESD-protected mat. Store ESD-sensitive
components in antistatic bags before placing it on any surface.
1. Remove the SBus filler panel(s) from the replacement motherboard as follows:
a. Squeeze the filler panel bottom locking tabs to unhook them from the back
panel.
b. Pull the filler panel away from the back panel.
2. Remove the NVRAM/TOD with carrier from the replacement motherboard.
3. Using long-nose pliers, set the serial port jumpers.
See Section C.5 “Jumper Description” on page C-29.
4. Lower the motherboard into the chassis.
Note – When lowering the motherboard, lower the motherboard at an angle to
allow the bottom row of motherboard rear panel connectors to align with their
respective chassis connector cutouts prior to lowering the motherboard front.
Note – Ensure that the hooks located on the chassis base engage with the slots
located on the bottom of the motherboard.
5. Align the chassis base hooks with the motherboard slots.
6. Using a number 2 Phillips screwdriver, replace the four screws securing the
motherboard back panel to the chassis.
7. Populate the motherboard as follows:
a. Connect the following to the motherboard:
■ Hard drive (Section 9.1.2 “Replacing a Hard Drive” on page 9-3).
■ SCSI cable (Section 8.2.2 “Replacing the SCSI Cable Assembly” on page 8-7).
■ DC power cable connectors; J1 from J3206, J2 from J3205, J3 from J3203, and J4
from J3204.
■ Diskette drive cable (Section 8.2.4 “Replacing the Diskette Drive Cable Assembly”
on page 8-9).
b. Replace the following on the motherboard: