compaq notebook evo n150 series User Manual

4–2Maintenance and Service Guide
Removal and Replacement Preliminaries
Plastic Parts
Using excessive force during disassembly and reassembly can
damage plastic parts. Use care when handling the plastic parts.
Apply pressure only at the points designated in the maintenance
instructions.
Cables and Connectors
Cables must be handled with extreme care to avoid damage.
Apply only the tension required to unseat or seat the cables
during removal and insertion. Handle cables by the connector
whenever possible....

Removal and Replacement Preliminaries
Maintenance and Service Guide4–3

Before handling a drive, ensure that you are discharged of
static electricity. While handling a drive, avoid touching the
connector.

Handle drives on surfaces that have at least one inch of
shock-proof foam.

Avoid dropping drives from any height onto any surface.

After removing a hard drive, CD-ROM drive, or a diskette
drive, place it into a static-proof bag.

Avoid exposing a hard drive to products that have magnetic
fields such...

4–4Maintenance and Service Guide
Removal and Replacement Preliminaries
4.4 Preventing Electrostatic Damage
Many electronic components are sensitive to electrostatic
discharge (ESD). Circuitry design and structure determine the
degree of sensitivity. Networks built into many integrated circuits
provide some protection, but in many cases the discharge contains
enough power to alter device parameters or melt silicon junctions.
A sudden discharge of static electricity from a finger or other
conductor can...

Removal and Replacement Preliminaries
Maintenance and Service Guide4–5

Place reusable electrostatic-sensitive parts from assemblies in
protective packaging or non conductive foam.

Use transporters and conveyers made of antistatic belts and
roller bushings. Ensure that mechanized equipment used for
moving materials is wired to ground and that proper materials
were selected to avoid static charging. When grounding is not
possible, use an ionizer to dissipate electric charges.
4.6 Workstation Precautions...

4–6Maintenance and Service Guide
Removal and Replacement Preliminaries
4.7 Grounding Equipment and Methods
Grounding equipment must include either a wrist strap or a foot
strap at a grounded workstation.

When seated, wear a wrist strap connected to a grounded
system. Wrist straps are flexible straps with a minimum of
one megaohm ±10% resistance in the ground cords. To
provide proper ground, wear a strap snugly against the skin at
all times. On grounded mats with banana-plug connectors,
connect a wrist...

Removal and Replacement Preliminaries
Maintenance and Service Guide4–7

Non-conductive plastic bags, tubes, or boxes

Metal tote boxes

Electrostatic voltage levels and protective materials
Table 4-1 shows how humidity affects the electrostatic voltage
levels generated by different activities.
Table 4-2 lists the shielding protection provided by antistatic bags
and floor mats.
Ta b l e 4 - 1
Typical Electrostatic Voltage Levels
Relative Humidity
Event 10% 40% 55%
Walking across carpet 35,000 V 15,000 V...

Maintenance and Service Guide5–1
5
Removal and Replacement
Procedures
This chapter provides removal and replacement procedures.
All screws removed during disassembly are P0 Phillips screws.
There are 64 screws and screwlocks in 13 different sizes that must
be removed and replaced when servicing the computer. Make
special note of each screw size and location during removal and
replacement.
Refer to Appendix C, “Screw Listing,” for detailed information
on screw sizes, locations, and usage. 

5–2Maintenance and Service Guide
Removal and Replacement Procedures
5.1 Serial Number
Report the computer serial number to Compaq when requesting
information or ordering spare parts. The serial number is located
on the bottom of the computer (Figure 5-1).
Figure 5-1. Serial Number Location 

Removal and Replacement Procedures
Maintenance and Service Guide5–3
5.2 Disassembly Sequence Chart
Use the following chart to determine the section number to be
referenced when removing computer components.
Ta b l e 5 - 1
Disassembly Sequence Chart
Section Description#ofScrews
Removed
5.3 Preparing the computer for disassembly 0
5.4 Computer feet 0
5.5 Hinge covers 0
5.6 Keyboard 2
5.7 Display 4
5.8 EMI shield 1
5.9 Top cover 18
5.10 TouchPad 5
5.11 Speakers 10
5.12 Microphone 0
5.13 Display lid switch...

5–4Maintenance and Service Guide
Removal and Replacement Procedures
5.3 Preparing the Computer for
Disassembly
Perform the following steps before disassembling the computer.
Consult the computerHardware Guidefor instructions on the
following steps:
1. Turn off the computer.
2. Disconnect the AC Adapter and all external devices.
3. Remove the battery pack.
4. Remove the hard drive.
5. Remove the Media Bay device.
5.4 Computer Feet
The computer feet are adhesive-backed rubber pads. The
computer feet are...