Chapter 11 Main Logic Board and Component Replacement 11-7
11.2.1 Removing the VSIMM
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
nonconducting 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.
To remove the VSIMM from the system unit:
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 the fan is not running.
Then open the system unit and attach a wrist strap as described in Section 7.3
“Attaching the Wrist Strap.
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. When the system power switch is in the Standby position, and the AC
power cord remains connected to a power outlet, hazardous AC voltage is still
present in the power supply primary. Do not attempt to service the power supply
under these conditions. Disconnect the AC power cord prior to handling the power
supply. When servicing any other system component, the AC power cord should
remain connected and poses no safety hazard.
2. Locate the VSIMM slot on the main logic board.
See
FIGURE 11-5.
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