Sun Microsystems Ultra 5, Service Manual

Page: 161 / 258

Chapter 8 Motherboard and Component Replacement 8-15
8.6 Motherboard
To remove and replace a motherboard, proceed as follows.
Caution –
Use an antistatic mat when working with the motherboard. An antistatic
mat contains the cushioning needed to protect the underside components, to prevent
motherboard flexing, and to provide antistatic protection.
8.6.1 Removing the Motherboard
1. Power off the system, remove the system cover, and attach an antistatic wrist strap
as described in Chapter 5.
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. Remove the motherboard as follows (
FIGURE 8-7
and
FIGURE 8-8
):
a. Remove the power supply.
See Section 6.1.1 “Removing the Power Supply” on page 6-1.
b. Remove the diskette drive (or optional secondary hard drive).
See Section 7.1.1 “Removing the Diskette Drive” on page 7-1.
c. Disconnect the following from the motherboard:
■
Speaker cable connector (J18)
■
CPU fan cable connector (J19)
■
Power-on LED/software power-on cable connector (J17)
■
Diskette drive cable assembly (J16)
■
CD-ROM drive cable connector (J14)
■
Hard drive cable connector (J15)
■
Audio cable assembly (J9)
■
Serial/parallel cable assembly (J7/J8)
d. Remove the following from the system:
i. CPU module
See Section 8.1.1 “Removing the CPU Module” on page 8-1.