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

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viii Preface
Technician Notes
!
WARNING: Only authorized technicians trained by Compaq should attempt to repair this equipment. All
troubleshooting and repair procedures are detailed to allow only subassembly/module level repair.
Because of the complexity of the individual boards and subassemblies, no one should attempt to make
repairs at the component level or to make modifications to any printed wiring board. Improper repairs can
create a safety hazard. Any indications of component replacement or printed wiring board modifications
may void any warranty.
CAUTION: To properly ventilate your system, you must provide at least 3-inches (7.6-cm) of clearance
at the front and back of the computer.
CAUTION:
The computer is designed to be electrically grounded. To ensure proper operation, plug the
AC power cord into a properly grounded AC outlet only.
System Serial Number
The serial number is located on the right side of the system unit cover on the bottom front.
For the purpose of AssetControl, the serial number is embedded in the CMOS on the system board.
Locating Additional Information
The following documentation is available to support these products:
■
User Documentation
■
Technical Training Guides
■
Compaq Service Advisories and Bulletins
■
Compaq QuickFind
■
Technical Reference Guide
■
Compaq Service Quick Reference Guide