Service manual

Chapter 10 Motherboard and Component Replacement 10-17
Note – The Ultra 2 system and server units must have four DSIMMs in group 0 for
the unit to boot. Up to 16 DSIMMs can be installed in the unit. DSIMM installation
location is listed in TABLE 10-1.
10.5.1 Removing a DSIMM
Caution – Handle DSIMMs only by the edges. Do not touch the DSIMM
components or metal parts. Always wear a grounding strap when handling a
DSIMM.
1. Power off the system unit.
See Section 6.2 “Powering Off the System Unit” on page 6-2.
2. Remove the system unit cover.
See Section 7.1 “Removing the System Unit Cover” on page 7-1.
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 it on any surface.
3. Attach the wrist strap.
See Section 7.2 “Attaching the Wrist Strap” on page 7-3.
TABLE 10-1 DSIMM Installation Location
Group Bank Pair Slots
0
0
1
0
1
U0501, U0401
U0701, U0601
1
0
1
2
3
U0502, U0402
U0702, U0602
2
0
1
4
5
U0503, U0403
U0703, U0603
3
0
1
6
7
U0504, U0404
U0704, U0604