System I/O Board; Removing The System I/O Board - Sun Microsystems SPARC classic Service Manual

Reconnecting system components
5. Refer to Chapter 6 "Power Off and On to turn the power on.
8.3

System I/O Board

The system I/O board is located in the bottom half of the system unit (see
FIGURE 8-3
unit's rear panel. The main logic board plugs into the system I/O board.
Caution – Printed circuit boards are made of delicate electronic components that
are extremely sensitive to static electricity. Ordinary amounts of static from your
clothes or work environment can destroy the boards. Handle boards only by the
non-conducting edges. Do not touch the components themselves or any metal parts.
Always wear a grounding (wrist) strap when handling the boards. Attach the wrist
strap to the metal casing of the power supply at the rear of the unit top.
8.3.1

Removing the System I/O Board

To remove the system I/O board:
1. Prepare to work on the system as described in Chapter 6 "Power Off and On, and
in Chapter 7 "Internal Access.
Halt the system and verify that the power LED is not lit and that the fan is not
running. Then open the system unit, detach all peripherals, and attach a wrist strap
as described in Section 7.3 "Attaching the Wrist Strap" on page 7-3.
Caution – The AC power cord should remain attached between the system unit and
an AC wall outlet. This connection provides the ground path necessary to protect
internal system components from harmful static discharges. Inside the system unit,
be sure the power supply wiring harness is connected to the main logic board to
complete the ground.
Caution – Verify that the system power switch is in the Standby position. The green
LED at the front of the system unit should not be lit and the fan should not be
running.
). It provides all of the system's I/O connectors through cutouts in the
Chapter 8 Major Subassemblies 8-7