Compaq Deskpro 4000N - Desktop PC User manual

MAINTENANCE
& SERVICE GUIDE
Compaq Deskpro 4000N and 4000S
Network Personal Computers

Notice
The information in this guide is subject to change without notice.
COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR
TECHNICAL OR EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN;
NOR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM
THE FURNISHING, PERFORMANCE, OR USE OF THIS MATERIAL.
This guide contains information protected by copyright. No part of this guide may be
photocopied or reproduced in any form without prior written consent from Compaq
Computer Corporation.
1997 Compaq Computer Corporation.
All rights reserved. Printed in the U.S.A.
Compaq, Deskpro
Registered U. S. Patent and Trademark Office.
Microsoft, MS-DOS, and Windows are registered trademarks of Microsoft Corporation.
The software described in this guide is furnished under a license agreement or
nondisclosure agreement. The software may be used or copied only in accordance with
the terms of the agreement.
Product names mentioned herein may be trademarks and/or registered trademarks of their
respective companies.
Maintenance & Service Guide
Compaq Deskpro 4000S and 4000N Series of Personal Computers
Second Edition (August 1997)
First Edition (July 1997)
Part Number 288388-002
Spare Part Number 288457-001
Compaq Computer Corporation

CPS

Preface vii
preface
ABOUT THIS GUIDE
This Maintenance and Service Guide is a troubleshooting and repair guide that can be used for
reference when servicing the Compaq Deskpro 4000S and 4000N Series of Personal Computers.
Only authorized technicians trained by Compaq should attempt to repair this equipment.
Compaq Computer Corporation reserves the right to make changes to the Compaq Deskpro 4000S
and 4000N Series of Personal Computers without notice.
Symbols and Conventions
The following text and symbols mark special messages throughout this guide:
!WARNING: Text set off in this manner indicates that failure to follow directions in the warning could result
in bodily harm or loss of life.
CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to
equipment or loss of data.
✎Text set off in this manner presents commentary, sidelights, clarifying information, or specific
instructions.
The following format conventions distinguish elements of the text throughout this guide:
■Drive letters that are not in command lines are presented in uppercase type as shown here:
drive A.
■Folder or directory names that are not in command lines are presented in uppercase type as
shown here: DIRECTORY.
■The file names are presented in uppercase italic type as shown here: FILENAME.
■The names of commands are presented in lowercase as shown here: install or a:\install.
■Commands that are to be entered at the system prompt may be shown on a separate line:
a:\install
■When you need to type information without pressing Enter, you are directed to “type” the
information.
■When you need to type the information and press Enter, you are directed to “enter” the
information.

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

Compaq Deskpro 4000S and 4000N Personal Computers 1-1
chapter 1
PRODUCT DESCRIPTION
This chapter describes the model offerings and features of the Compaq Deskpro 4000S and 4000N
Series of Personal Computers.
Figure 1-1. Compaq Deskpro 4000S and 4000N Series Personal Computers

1-2 Product Description
1.1 Models
Table 1-1
Deskpro 4000S Models
Configuration
Code Processor/ Speed* Diskette Drive CD-ROM Drive Hard Drive Standard Memory Maximum Memory Internal Cache Internal Graphics
BPC2 P55C/166 1.44-MB std n/a 2.1-GB 16-MB 256-MB 256-KB S3/KV2**
BPC3 P55C/166 1.44-MB std 20X max 2.1-GB 32-MB 256-MB 256-KB S3/KV2**
BPD2 P55C/200 1.44-MB std n/a 2.1-GB 16-MB 256-MB 256-KB S3/KV2**
BPD3 P55C/200 1.44-MB std 20X max 2.1-GB 32-MB 256-MB 256-KB S3/KV2**
BSL2 P55C/233 1.44-MB std n/a 2.1-GB 16-MB 256-MB 256-KB S3/KV2**
BSL3 P55C/233 1.44-MB std 20X max 2.1-GB 32-MB 256-MB 256-KB S3/KV2**
* P55C is an Intel Pentium Processor with MMX Technology.
**S3 Enhanced 64-bit Graphics.
Table 1-2
Deskpro 4000N Models
Configuration
Code Processor/ Speed* Hard Drive Standard Memory Maximum Memory Internal Cache Internal Graphics
BQZ3 P55C/166 1.6-GB 16-MB 256-MB 256-KB S3/KV2**
BQZ2 P55C/166 1.6-GB 32-MB 256-MB 256-KB S3/KV2**
BQ22 P55C/200 1.6-GB 32-MB 256-MB 256-KB S3/KV2**
BSS2 P55C/233 1.6-GB 32-MB 256-MB 256-KB S3/KV2**
*P55C is an Intel Pentium Processor with MMX Technology.
**S3 Enhanced 64-bit Graphics.

Compaq Deskpro 4000S and 4000N Personal Computers 1-3
1.2 Features
Table 1-3
Features
Item Description
Processor
Speed, MHz
Intel Pentium Processor with MMX Technology
166, 200, 233
Cache, capacity in Kb
L1 (P54C only)
L1 (P55C only)
L2 (write-through, direct mapped)
16
32
256
Architecture
CMOS RAM, battery backed
Plug and Play capability
PCI/ISA
242-byte
standard
Chipset VIA Apollo VP-2
ROM BIOS Flash memory device
Memory, non-parity, 66 MHz, SDRAM (without ECC)
Base, MB
Maximum, MB
Upgrade modules available, MB
DIMM sockets
16 or 32
256
8, 16, 32, 64, 128
2
Bays
Deskpro 4000S
Deskpro 4000N
3.5-inch Internal/3.5-inch External/5.25-inch External Slimline
3.5-inch Internal
Expansion slot
Deskpro 4000S
Deskpro 4000N
One 7-inch PCI/ISA combination
One 7-inch PCI
Diskette drive, 3.5-inch drive bay (Deskpro 4000S only)
Standard
Optional (replaces 1.44-MB drive)
1.44-MB
120-MB (LS-120)
Hard drive, capacity in GB
Standard, EIDE with drive fault prediction
Optional, Ultra ATA with drive fault prediction*
Optional Ultra SCSI
1.6 (Deskpro 4000N), 2.1 (Deskpro 4000S)
2.4, 4.3
2.1, 4.2
CD-ROM drive (Deskpro 4000S only) 20X max Slimline on select models
Audio (Deskpro 4000S only)
Enhanced Business Pro Audio
Compaq Multimedia Sound System
Optional
Optional
Graphics, embedded on system board S3 Trio 64V2/GX Enhanced 64-bit Graphics with 2-MB memory
Network interface, embedded on system board Compaq Netelligent 10/100 TX Embedded UTP controller
*Drives are for replacement purposes only.
continued

1-4 Product Description
Table 1-2
Continued
Item Description
I/O ports, standard Serial (2)
Parallel
USB (2)
AUI
RJ-45
Monitor
Keyboard
Mouse
Power supply (2,000 volt surge suppressant capability) 76-watt, 115 VAC, 2.5 A/230 VAC, 1.25 A
Power supply fan Standard
Internal piezo speaker Standard
Internal battery Standard
Operating System
Deskpro 4000S
Deskpro 4000N
Windows 95
Windows NT
Intelligent Manageability features Asset Management
Fault Management
Security Management
Configuration Management
Integration Management
Two-button mouse Standard
Compaq Enhanced keyboard with MS Windows-specific keys Standard
1.3 Design Overview
The Compaq Deskpro 4000S and 4000N Series of Personal Computers are designed to use a pan-
type chassis to house the system board, expansion boards, power supply, and mass storage devices.
The chassis is supplemented by a riser board attached to the expansion board cage. The expansion
board cage provides a mounting location for the expansion board.
All internal components are accessible when the hood, held in place by two latches, is removed.
Lifting the Easy Access Drive Bay and Easy Access Power Supply to their upright positions allows
full access to the system board. The front bezel is mounted to the front of the system unit cover. Torx
T-15 screws are used to secure the Easy Access Drive Bay hinge bar and the Easy Access Power
Supply hinge bracket.
The system board is easily removed from the chassis after the hood and expansion board cage are
removed. Details of the disassembly procedure are found in Chapter 5, “Removal and Replacement
Procedures.”
The removable expansion board cage mounts perpendicular to the system board. The expansion
board installation is horizontal into the cage and is secured with a single screw.
The Easy Access Power Supply is mounted in the right rear corner of the chassis and pivots using a
pair of built-in hinges. The AC input cord must be removed prior to disconnecting the power supply
from the system board.