Removing The Memory Riser Assembly - Sun Microsystems Ultra 80 Service Manual

Caution – If the memory riser assembly is removed and replaced improperly,
damage to the connectors on the motherboard or the memory riser assembly can
occur.
Use the following procedure to remove and replace the memory riser assembly.
9.6.1

Removing the Memory Riser Assembly

1. Power off the system and remove the access panel.
See Section 6.1 "Powering Off the System/Removing the Access Panel" on page 6-1.
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 them on any surface.
2. Attach the antistatic wrist strap.
See Section 6.2 "Attaching the Antistatic Wrist Strap" on page 6-5.
3. If necessary, remove the DC-to-DC converter.
See Section 7.3.1 "Removing the DC-to-DC Converter Assembly" on page 7-7.
Caution – When removing the memory riser assembly, loosen both of the memory
riser assembly's thumbscrews at the same time to avoid connector damage.
4. Remove the memory riser assembly as follows:
a. Using the short leg of the torque-indicator driver, loosen the thumbscrews by
turning each screw one turn in a counter-clockwise direction (
b. Using your hands, loosen the thumbscrews simultaneously until the assembly
is loose.
Caution – The memory riser assembly must come straight out of the motherboard
connectors to avoid damaging the connectors.
c. When the thumbscrews have reached their full travel, lift the memory riser
assembly straight up out of the system (
5. Place the memory riser assembly on an antistatic mat.
-20 Sun Ultra 80 Service Manual • March 2000
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FIGURE 9-10
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FIGURE 9-9