Removal And Replacement Procedures All-In One (Aio) Chassis; Preparing To Disassemble The Computer - HP Pro 3420 Maintenance & Service Manual

7 Removal and Replacement Procedures
All-in One (AIO) Chassis
The following sections provide information about disassembling various components of the computer.

Preparing to Disassemble the Computer

To avoid injury and equipment damage, always complete the following steps in order, when opening
the computer.
1. Remove all media (CD, DVD, etc.) from the computer.
2. Shut down the computer.
3. After the system has completely shut down, disconnect the power adapter from the back of the
computer.
4. Disconnect all other attached cables from the back of the computer.
5. Place the computer face down on a soft flat surface. HP recommends that you set down a
blanket, towel, or other soft cloth to protect the screen surface from scratches or other damage.
WARNING! Beware of sharp edges inside the chassis.
Preparing to Disassemble the Computer 33