compaq presario 2800 User Manual

Maintenance and Service Guide4–1
4
Removal and Replacement
Preliminaries
This chapter provides essential information for proper and safe 
removal and replacement service.
4.1 Tools Required
You will need the following tools to complete the removal and 
replacement procedures:
■Magnetic screwdriver
■Phillips P0 screwdriver
■Tool kit (includes connector removal tool, loopback plugs, 
and case utility tool)
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4–2Maintenance and Service Guide
Removal and Replacement Preliminaries
4.2 Service Considerations
The following sections include some of the considerations that 
you should keep in mind during disassembly and assembly 
procedures.
✎As you remove each subassembly from the computer, place the 
subassembly (and all accompanying screws) away from the work 
area to prevent damage.
Plastic Parts
Using excessive force during disassembly and reassembly can 
damage plastic parts. Use care when handling the...

Removal and Replacement Preliminaries
Maintenance and Service Guide4–3
4.3 Preventing Damage to 
Removable Drives
Removable drives are fragile components that must be handled 
with care. To prevent damage to the computer, damage to a 
removable drive, or loss of information, observe the following 
precautions:
■Before removing or inserting a hard drive, shut down the 
computer. If you are unsure whether the computer is off or in 
Hibernation, turn the computer on, then shut it down.
■Before removing a...

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...

Removal and Replacement Preliminaries
Maintenance and Service Guide4–5
■Store reusable electrostatic-sensitive parts from assemblies in 
protective packaging or nonconductive foam.
■Use transporters and conveyors made of antistatic belts and 
roller bushings. Ensure that mechanized equipment used for 
moving materials is wired to ground and that proper materials 
are selected to avoid static charging. When grounding is not 
possible, use an ionizer to dissipate electric charges.
4.6 Workstation...

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 megohm ±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...

Removal and Replacement Preliminaries
Maintenance and Service Guide4–7
■Nonconductive 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.
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...

4–8Maintenance and Service Guide
Removal and Replacement Preliminaries
Table 4-2 lists the shielding protection provided by antistatic bags 
and floor mats.
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
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Maintenance and Service Guide5–1
5
Removal and Replacement
Procedures
This chapter provides removal and replacement procedures.
Phillips P1 screws are removed during disassembly. There are 
48 screws, in nine different sizes, that must be removed, replaced, 
and loosened 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.
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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
5.2 Disassembly Sequence Chart
Use the chart below to determine the section number to be 
referenced when removing computer components.
Ta b l e  5 - 1
Disassembly Sequence Chart
Section Description # of Screws...