HP EliteDesk 800 G4 Maintenance and Service Guide - Page 25

Removal and replacement procedures, Preparation for disassembly

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4 Removal and replacement procedures Adherence to the procedures and precautions described in this chapter is essential for proper service. After completing all necessary removal and replacement procedures, run the Diagnostics utility to verify that all components operate properly. NOTE: Not all features listed in this guide are available on all computers. Preparation for disassembly See Routine care, SATA drive guidelines, and disassembly preparation on page 9 for initial safety procedures. 1. Remove/disengage any security devices that prohibit opening the computer. 2. Close any open software applications. 3. Exit the operating system. 4. Remove any compact disc or media card from the computer. 5. Turn off the computer and any peripheral devices that are connected to it. IMPORTANT: Regardless of the power-on state, voltage is always present on the system board as long as the system is plugged into an active AC outlet. To prevent damage to internal components, you must disconnect the power cord from the power source before opening the computer. 6. Disconnect the power cord from the electrical outlet and then from the computer. 7. Disconnect all peripheral device cables from the computer. NOTE: During disassembly, label each cable as you remove it, noting its position and routing. Keep all screws with the units removed. CAUTION: The screws used in the computer are of different thread sizes and lengths; using the wrong screw in an application may damage the unit. 8. If the computer is on a stand, remove the computer from the stand. Preparation for disassembly 17

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4
Removal and replacement procedures
Adherence to the procedures and precautions described in this chapter is essential for proper service. After
completing all necessary removal and replacement procedures, run the Diagnostics utility to verify that all
components operate properly.
NOTE:
Not all features listed in this guide are available on all computers.
Preparation for disassembly
See
Routine care, SATA drive guidelines, and disassembly preparation
on page
9
for initial safety procedures.
1.
Remove/disengage any security devices that prohibit opening the computer.
2.
Close any open software applications.
3.
Exit the operating system.
4.
Remove any compact disc or media card from the computer.
5.
Turn
off
the computer and any peripheral devices that are connected to it.
IMPORTANT:
Regardless of the power-on state, voltage is always present on the system board as long
as the system is plugged into an active AC outlet. To prevent damage to internal components, you must
disconnect the power cord from the power source before opening the computer.
6.
Disconnect the power cord from the electrical outlet and then from the computer.
7.
Disconnect all peripheral device cables from the computer.
NOTE:
During disassembly, label each cable as you remove it, noting its position and routing. Keep all
screws with the units removed.
CAUTION:
The screws used in the computer are of
different
thread sizes and lengths; using the wrong
screw in an application may damage the unit.
8.
If the computer is on a stand, remove the computer from the stand.
Preparation for disassembly
17