HP Z4 Maintenance and Service Guide - Page 24

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 WARNING! Voltage is always present on the system board when the computer is plugged into an active AC outlet. To avoid possible personal injury and damage to the equipment the power cord should be disconnected from the computer and/or the AC outlet before opening the computer. 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. Remove all removable media, such as compact discs or USB flash drives, from the computer. 3. Turn off the computer properly through the operating system, then turn off any external devices. 4. Disconnect the power cord from the power outlet and disconnect any external devices. CAUTION: Turn off the computer before disconnecting any cables. 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. In some systems the cooling fans are on even when the computer is in the "Standby," or "Suspend" modes. The power cord should always be disconnected before servicing a unit. NOTE: During disassembly, label each cable as you remove it, noting its position and routing. Keep all screws with the removed components. 16 Chapter 4 Removal and replacement procedures

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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
WARNING!
Voltage is always present on the system board when the computer is plugged into an active
AC outlet. To avoid possible personal injury and damage to the equipment the power cord should be
disconnected from the computer and/or the AC outlet before opening the computer.
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.
Remove all removable media, such as compact discs or USB
flash
drives, from the computer.
3.
Turn
off
the computer properly through the operating system, then turn
off
any external devices.
4.
Disconnect the power cord from the power outlet and disconnect any external devices.
CAUTION:
Turn
off
the computer before disconnecting any cables.
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. In some systems the cooling fans are on even when the computer is
in the “Standby,” or “Suspend” modes. The power cord should always be disconnected before servicing
a unit.
NOTE:
During disassembly, label each cable as you remove it, noting its position and routing. Keep all
screws with the removed components.
16
Chapter 4
Removal and replacement procedures