Sun Microsystems SPARCstation 20, Service Manual

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56 SPARCstation 20 Service Manual • July 1996
2. Disconnect the power cord from the back of the system unit and from the wall
receptacle.
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. Remove the cover and attach a wrist strap.
See Chapter 7.
Note –
The wrist strap is usually grounded to the power supply. When removing or
installing the power supply, ground the wrist strap to the metal edge of the system
back panel.
4. Remove the power supply as follows (
FIGURE 8-1
):
a. Loosen the back panel captive screws that secure the power supply to the
chassis.
Note –
Some systems use only one captive screw to secure the power supply.
b. Disconnect the DC power connector from the system board.
c. Slide the power supply toward the drive bracket and free of the chassis
mounts.
d. Lift the power supply from the chassis.