Compaq Deskpro 4000N - Desktop PC, Maintenance & Service Manual

Page: 81 / 174

Compaq Deskpro 4000S and 4000N Personal Computers 5-7
5.4 Preparation for Disassembly
See Chapter 4, “Removal and Replacement Preliminaries,” for initial procedures.
To prepare the computer for disassembly, complete the following steps:
1. Remove any diskette or compact disc from the computer.
2. Turn off the computer and any peripheral devices that are connected to it.
CAUTION: Turn off the computer before disconnecting any cables.
CAUTION: When the computer is plugged into an AC power source there is always voltage applied to the
system board. You must disconnect the power cord from the power source before opening the computer to
prevent system board or component damage.
3. Disconnect the power cord from the electrical outlet and then from the computer.
4. Disconnect all peripheral device cables from the computer.
✎
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.