compaq armada 110 User Manual

							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 destroy static-sensitive devices or microcircuitry. 
Often the spark is neither felt nor heard, but damage occurs. An 
electronic device exposed to electrostatic discharge may not be 
affected at all and can work perfectly throughout a normal cycle. 
It may function normally for a while, then degrade in the internal 
layers, reducing its life expectancy.
4.5 Packaging and Transporting 
Precautions
Use the following grounding precautions when packaging and 
transporting equipment:

To avoid hand contact, transport products in static-safe 
containers such as tubes, bags, or boxes.

Protect all electrostatic-sensitive parts and assemblies with 
conductive or approved containers or packaging.

Keep electrostatic-sensitive parts in their containers until they 
arrive at static-free workstations.

Place items on a grounded surface before removing them 
from their container.

Always be properly grounded when touching a sensitive 
component or assembly. 
						

							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
Use the following grounding precautions at workstations:

Cover the workstation with approved static-dissipative 
material (refer to Table 4-2).

Use a wrist strap connected to a properly grounded work 
surface and use properly grounded tools and equipment.

Use conductive field service tools, such as cutters, 
screwdrivers, and vacuums.

When using fixtures that must directly contact dissipative 
surfaces, use fixtures made of static-safe materials only.

Keep the work area free of nonconductive materials such as 
ordinary plastic assembly aids and Styrofoam.

Handle electrostatic-sensitive components, parts, and 
assemblies by the case or PCM laminate. Handle them only at 
static-free workstations.

Avoid contact with pins, leads, or circuitry.

Turn off power and input signals before inserting or removing 
connectors or test equipment. 
						

							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 snug against the skin at 
all times. On grounded mats with banana-plug connectors, 
connect a wrist strap with alligator clips.

When standing, use foot straps and a grounded floor mat. 
Foot straps (heel, toe, or boot straps) can be used at standing 
workstations and are compatible with most types of shoes or 
boots. On conductive floors or dissipative floor mats, use 
them on both feet with a minimum of one-megaohm 
resistance between the operator and ground. To be effective, 
the conductive strips must be worn in contact with the skin.

Other grounding equipment recommended for use in 
preventing electrostatic damage includes:

Antistatic tape

Antistatic smocks, aprons, or sleeve protectors

Conductive bins and other assembly or soldering aids

Non-conductive foam

Conductive tabletop workstations with ground cord of 
one-megaohm resistance

Static-dissipative table or floor mats with hard tie to ground

Field service kits

Static awareness labels

Material-handling packages 
						

							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 7,500 V
Walking across vinyl floor 12,000 V  5,000 V 3,000 V
Motions of bench worker 6,000 V 800 V 400 V
Removing DIPS from plastic tube 2,000 V 700 V 400 V
Removing DIPS from vinyl tray 11,500 V 4,000 V 2,000 V
Removing DIPS from Styrofoam 14,500 V 5,000 V 3,500 V
Removing bubble pack from PCB 26,500 V 20,000 V 7,000 V
Packing PCBs in foam-lined box 21,000 V 11,000 V 5,000 V
✎A product can be degraded by as little as 700 volts.
Table 4-2
Static-Shielding Materials
Material Use Voltage Protection Level
Antistatic plastic Bags 1,500 V
Carbon-loaded plastic  Floor mats 7,500 V
Metallized laminate Floor mats 5,000 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 four different sized screws that must be removed and 
replaced when servicing the computer. Make special note of the 
size and location of each screw 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 
						

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Maintenance and Service Guide5–3
5.2 Disassembly Sequence Chart
Use the chart below to determine the section number to be 
referenced when removing computer components.
Table 5-1
Disassembly Sequence Chart
Section Description# of Screws 
Removed
5.3 Preparing the computer for disassembly 0
5.4 Computer feet 0
5.5 LED cover 0
5.6 Keyboard 2
5.7 Optical drive 1
5.8 Display 7
5.9 Heat sink 5
5.10 Processor 0
5.11 Top cover 15
5.12 Diskette drive 2
5.13 TouchPad 1
5.14 Hard drive
Hard drive bracket3
5.15 Disk cell Real Time Clock (RTC) battery 0
5.16 Fan
Fan bracket2
5.17 System board
Optical drive alignment rail7 
						

							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 computer Hardware Guide for instructions on the 
following steps:
1. Turn off the computer.
2. Disconnect the AC Adapter and all external devices.
3. Remove any battery packs inserted into the computer.
4. Remove the memory expansion compartment cover. 
						

							Removal and Replacement Procedures
Maintenance and Service Guide5–5
5.4 Computer Feet
The computer feet are adhesive-backed rubber pads. The 
computer feet are included in the Plastics Kit (spare part number 
233562-001). Refer to Figure 5-2 for the computer feet locations.
Figure 5–2: Replacing the Computer Feet
Computer Feet
Spare Part Number Information
Plastics kit, includes: Spare part number 233562-001
Left hinge cover Computer feet
Right hinge cover RJ-45 cover
Mini PCI slot cover RJ-11 cover
Memory expansion compartment cover 
						

							5–6Maintenance and Service Guide
Removal and Replacement Procedures
5.5 LED Cover
1. Prepare the computer for disassembly (Section 5.3).
2. Turn the computer top side up with the front facing you.
3. Open the computer.
4. Lift up the left edge of the LED cover 1 (Figure 5-3).
5. Lift up the front edge of the LED cover from left to right 2.
6. Lift the LED cover straight up to remove it.
Figure 5–3: Removing the LED Cover
Reverse the above procedure to install the LED cover.
LED Cover
Spare Part Number Information
LED cover 233559-001