Chapter 11 Main Logic Board and Component Replacement 11-31
■ Detaching the wrist strap
■ Closing the system unit
■ Reconnecting system components
9. Refer to Chapter 6 “Power Off and On” to turn the power on.
11.5 Nonvolatile RAM (NVRAM)
This section describes the removal and replacement procedures for the NVRAM
chip. If you replace the main logic board, you must transfer the NVRAM chip from
the faulty board to the replacement board.
Caution – The NVRAM chip is a delicate electronic component that is extremely
sensitive to static electricity. Ordinary amounts of static from your clothes or work
environment can destroy the NVRAM. Always wear a grounding strap when
handling the NVRAM.
11.5.1 Removing the NVRAM
To remove the NVRAM:
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. 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
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