HP Compaq tc4400 Manual

t
Maintenance and Service
Guide
HP Compaq tc4400 Tablet PC
Document Part Number: 383208-002
May 2006
This guide is a troubleshooting reference used for maintaining
and servicing the tablet PC. It provides comprehensive
information on identifying tablet PC features, components, and
spare parts; troubleshooting tablet PC problems; and performing
tablet PC disassembly procedures.

© Copyright 2006 Hewlett-Packard Development Company, L.P.
Microsoft and Windows are U.S. registered trademarks of Microsoft
Corporation. Intel, Celeron, and Core are trademarks or registered
trademarks of Intel Corporation or its subsidiaries in the United States and
other countries. Bluetooth is a trademark owned by its proprietor and used
by Hewlett-Packard Company under license. SD Logo is a trademark of its
proprietor.
The information contained herein is subject to change without notice. The
only warranties for HP products and services are set forth in the express
warranty statements accompanying such products and services. Nothing
herein should be construed as constituting an additional warranty. HP shall
not be liable for technical or editorial errors or omissions contained herein.
Maintenance and Service Guide
HP Compaq tc4400 Tablet PC
Second Edition: May 2006
First Edition: March 2005
Document Part Number: 383208-002

Maintenance and Service Guide iii
Contents
1 Product Description
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
1.2 Resetting the Tablet PC. . . . . . . . . . . . . . . . . . . . . . . 1–4
1.3 Power Management. . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
1.4 External Components . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1.5 Design Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . 1–22
2 Troubleshooting
2.1 Computer Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Using Computer Setup . . . . . . . . . . . . . . . . . . . . . . . 2–1
Selecting from the File Menu . . . . . . . . . . . . . . . . . . 2–2
Selecting from the Security Menu . . . . . . . . . . . . . . 2–3
Selecting from the Diagnostics Menu. . . . . . . . . . . . 2–4
Selecting from the System Configuration Menu. . . . 2–5
2.2 Troubleshooting Flowcharts . . . . . . . . . . . . . . . . . . . 2–6

iv Maintenance and Service Guide
Contents
3 Illustrated Parts Catalog
3.1 Serial Number Location . . . . . . . . . . . . . . . . . . . . . . 3–1
3.2 Computer Major Components. . . . . . . . . . . . . . . . . . 3–2
3.3 Plastics Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–11
3.4 Cable Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–12
3.5 Miscellaneous (Not Illustrated). . . . . . . . . . . . . . . . 3–13
3.6 Sequential Part Number Listing . . . . . . . . . . . . . . . 3–15
4 Removal and Replacement Preliminaries
4.1 Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.2 Service Considerations . . . . . . . . . . . . . . . . . . . . . . . 4–2
Plastic Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
Cables and Connectors . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.3 Preventing Damage to Removable Drives . . . . . . . . 4–3
4.4 Preventing Electrostatic Damage . . . . . . . . . . . . . . . 4–4
4.5 Packaging and Transporting Precautions . . . . . . . . . 4–5
4.6 Workstation Precautions . . . . . . . . . . . . . . . . . . . . . . 4–6
4.7 Grounding Equipment and Methods . . . . . . . . . . . . . 4–7

Contents
Maintenance and Service Guide v
5 Removal and Replacement Procedures
5.1 Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.2 Disassembly Sequence Chart . . . . . . . . . . . . . . . . . . 5–3
5.3 Preparing the Tablet PC for Disassembly . . . . . . . . . 5–5
5.4 Hard Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–7
5.5 Tablet PC Feet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–11
5.6 Bluetooth Module . . . . . . . . . . . . . . . . . . . . . . . . . . 5–12
5.7 External Memory Module . . . . . . . . . . . . . . . . . . . . 5–14
5.8 Keyboard Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–17
5.9 Keyboard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–20
5.10 Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–24
5.11 Heat Sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–25
5.12 Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–28
5.13 Internal Memory Module . . . . . . . . . . . . . . . . . . . 5–30
5.14 Mini Card WLAN Module . . . . . . . . . . . . . . . . . . 5–32
5.15 Display Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 5–34
5.16 Button Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–40
5.17 Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–43
5.18 TouchPad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–47
5.19 Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–51
5.20 Infrared Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–53
5.21 System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–55
5.22 Modem Module. . . . . . . . . . . . . . . . . . . . . . . . . . . 5–60
5.23 RTC Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–62

vi Maintenance and Service Guide
Contents
6 Specifications
A Screw Listing
B Software Backup and Recovery
C Display Component Recycling
D Connector Pin Assignments
E Power Cord Set Requirements
Index

Maintenance and Service Guide 1–1
1
Product Description
The HP Compaq tc4400 Tablet PC offers advanced modularity,
Intel® Core™ Duo and Celeron® M processors, and extensive
multimedia support.
HP Compaq tc4400 Tablet PC

1–2 Maintenance and Service Guide
Product Description
1.1 Features
■Intel Core Duo T2600 (2.17-GHz), T2500 (2.00-GHz),
T2400 (1.83-GHz), and T2300 (1.67-GHz) or Intel
Celeron M 1.60-GHz processors, varying by tablet PC model
■12.1-inch, XGA, TFT (1024 × 768) display with over
16.8 million colors
■100-, 80-, or 60-GB high-capacity hard drive, varying by
tablet PC model
■256-MB DDR2 synchronous DRAM (SDRAM) at 633 MHz
and 533 MHz, expandable to 4.0 GB
■Microsoft® Windows® XP Tablet Edition
■Full-size Windows keyboard with embedded numeric keypad
■TouchPad and pointing stick pointing devices, including a
dedicated vertical scroll region
■Integrated 10Base-T/100Base-T/1000Base-T Ethernet local
area network (LAN) network interface card (NIC) with RJ-45
jack
■Integrated high-speed 56K modem with RJ-11 jack
■Integrated wireless support for Mini PCI IEEE 802.11b/g and
802.11a/b/g WLAN device
■Support for one Type I or Type II PC Card slot, with support
for both 32-bit (CardBus) and 16-bit PC Cards

Product Description
Maintenance and Service Guide 1–3
■External 65-watt AC adapter with 3-wire power cord
■6-cell Li-Ion battery pack
■Audio speaker
■Volume up, volume mute, and volume down buttons
■Connectors:
❏Infrared
❏Audio-out (headphone)
❏Audio-in (microphone)
❏Universal Serial Bus (USB) v. 2.0 (3 ports, 1 powered)
❏Power
❏External monitor
❏RJ-45 (network)
❏RJ-11 (modem)
❏S-Video-out
❏PC Card
❏Digital Media Slot
❏Primary battery pack
❏Travel battery pack
❏Docking connector

1–4 Maintenance and Service Guide
Product Description
1.2 Resetting the Tablet PC
If the tablet PC you are servicing has an unknown password,
follow the steps below to clear the password. These steps also
clear CMOS.
✎The following steps will not clear an unknown password if the
stringent security option has been enabled in the BIOS. If
stringent security is enabled, the system board must be replaced
to reset an unknown password. Refer to Section 5.21, “System
Board,” for more information on replacing the system board.
Before replacing the system board, perform the steps below to
make sure stringent security has been properly enabled.
Enabling stringent security provides enhanced prtotection for the
power-on password and administrator password and other forms
of power-on authorization. Stringent security is enabled/disabled
by accessing the Password Options menu in the Computer Setup
utility. Refer to Section 2.1, “Computer Setup,” for more
information.
1. Prepare the tablet PC for disassembly (refer to Section 5.3,
“Preparing the Tablet PC for Disassembly,” for more
information).
2. Remove the real-time clock (RTC) battery (refer to
Section 5.23, “RTC Battery,” for more information on
removing and replacing the RTC battery).
3. Wait approximately 5 minutes.
4. Replace the RTC battery and reassemble the tablet PC.
5. Connect AC power to the tablet PC. Do not reinsert any
batteries at this time.
6. Turn on the tablet PC.
All passwords and all CMOS settings have been cleared.