SEARCH CONTACT US SUPPORT SERVICES PRODUCTS STORE
United States    
COMPAQ STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US | SEARCH
 

Maintenance & Service Guide
Presario 5600 Series Personal Computers

MSG Index | Home  |   Preface    |   Product Description   |   Troubleshooting   |   Illustrated Parts   |    Removal & Replacement
Jumpers & Switches   |   Specifications   |   Connector Pins    |   Power Cord Requirements


Disassembly Sequence

 

Preparation for Disassembly
Serial Number Location
Hood
Front Bezel
Card Guides
Fan
USB Cables
Creativity Center
Mass Storage Devices
Memory
Option Card Retainer
Graphics Board
Fax/Modem
Serial Port
Homenet Daughter Board
Processor
Processor Goal Posts
System Board Cables
System Board
RTC Battery
I/O Panel
Power Supply

Removal and Replacement

This chapter provides general service information for Compaq Presario 5600 Series Personal Computers. Adherence to the procedures and precautions described in this chapter is essential for proper service.

The topics discussed in this section include the following:

Electrostatic Discharge

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 (ESD) may not be affected at all and will work perfectly throughout a normal cycle. Or it may function normally for a while, then degrade in the internal layers, reducing its life expectancy.

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.

Top

Generating Static

The accompanying table shows typical electrostatic voltages generated  by different activities.

Typical Electrostatic Voltages

  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 tubes 2,000 V 700 V 400 V
Removing DIPS from vinyl trays 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 PCBs 26,000 V 20,000 V 7,000 V
Packing PCBs in foam-lined box 21,000 V 11,000 V 5,000 V
NOTE:  700 volts can degrade a product.

Top

 

Preventing Electrostatic Damage to Equipment

Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of sensitivity. The following proper packaging and grounding precautions are necessary to prevent damage:

  • Protect all electrostatic parts and assemblies with conductive or approved containers or packaging.
  • Keep electrostatic sensitive parts in their containers until they arrive at static-free stations.
  • Place items on a grounded surface before removing them from their
    container.
  • Always be properly grounded when touching a sensitive component or assembly.
  • Place reusable electronic-sensitive parts from assemblies in protective packaging or conductive foam.
  • Use transporters and conveyors made of antistatic belts and metal roller bushings. Mechanized equipment used for moving materials must be wired to ground and proper materials selected to avoid static charging. When grounding is not possible, use an ionizer to dissipate electric charges.

The accompanying table shows typical static-shielding protection levels afforded by different protective packaging materials.

Static-Shielding Protection Levels

Method Voltages
Antistatic Plastic 1,500
Carbon-Loaded Plastic 7,500
Metallized Laminate 15,000

Top

Preventing Damage to Drives

To prevent static damage to hard drives, use the following precautions:

  • Handle drives gently, using static-guarding techniques.
  • Store drives in the original shipping containers.
  • Avoid dropping drives from any height onto any surface.
  • Handle drives on surfaces that have at least one inch of shock-proof foam.
  • Always place drives PCB assembly side down on the foam.

Top

Grounding Methods

The method for grounding must include a wrist strap or a foot strap at a grounded workstation. When seated, wear a wrist strap connected to a grounded system. When standing, use footstraps and a grounded floor mat.
Top

Grounding Workstations

To prevent static damage at the workstation, use the following precautions:

  • Cover the workstation with approved static-dissipative material.
  • Provide a wrist strap connected to the work surface and properly grounded tools and equipment.
  • Use static-dissipative mats, heel straps, or air ionizers to give added protection.
  • Handle electrostatic sensitive components, parts, and assemblies by the case or PCB laminate. Handle them only at static-free workstations.
  • Avoid contact with pins, leads, or circuitry.
  • Turn off power and input signals before inserting and removing connectors or test equipment.
  • Use fixtures made of static-safe materials when fixtures must directly contact dissipative surfaces.
  • Keep work area free of nonconductive materials such as ordinary plastic assembly aids and Styrofoam.
  • Use field service tools, such as cutters, screwdrivers, vacuums, that are conductive.
  • Use a portable field service kit with a static dissipative vinyl pouch that folds out of a work mat. Also use a wrist strap and a ground cord for the work surface. Ground the cord to the chassis of the equipment undergoing test or repair.

Top

Grounding Equipment

Use the following equipment to prevent static electricity damage to the equipment:

  • Wrist Straps are flexible straps with a minimum of 1 mega ohm +/- 10% resistance to the ground cords. To provide proper ground, a strap must be worn snug against the skin. On grounded mats without banana-plug connectors, connect a wrist strap with alligator clips.
  • Heelstraps/Toestraps/Bootstraps can be used at standing workstations and are compatible with most types of boots and shoes. On conductive floors or dissipative floor mats, use them on both feet with a minimum of 1 mega ohm resistance between operator and ground. To be effective, the conductive strips must be worn in contact
    with the skin.

Top

Recommended Materials and Equipment

Other materials and equipment that are recommended for use in preventing static electricity include:

  • Antistatic tape
  • Antistatic smocks, aprons, or sleeve protectors
  • Conductive bins, and other assembly or soldering aids
  • Conductive foam
  • Conductive tabletop workstations with ground cord of 1 mega ohm
    of resistance
  • Static dissipative table or floor mats with hard tie to ground
  • Field service kits
  • Static awareness labels
  • Wrist straps and footwear straps providing 1 mega ohm (+/- 10%) resistance
  • Material handling packages
  • Conductive plastic bags
  • Conductive plastic tubes
  • Conductive tote boxes
  • Metal tote boxes
  • Opaque shielding bags
  • Transparent metallized shielding bags
  • Transparent shielding tubes

Top

Tool Requirements

  • Torx T-8, T-10, and T-15 screwdrivers (included in kit number 130619-001)
  • Needle-nose pliers
  • Flat-bladed screwdriver
  • Diagnostics software

Top

Screws

The screws used in these products are not interchangeable. If an incorrect screw is used during the reassembly process, it could cause damage to the unit. Compaq strongly recommends that all screws removed during the disassembly process be kept with the part that was removed, then returned to their proper locations.

IMPORTANT: As each subassembly is removed from the computer, it should be placed away from the work area to prevent damage

Top

Cables and Connectors

Most cables used throughout the unit are ribbon cables (Figures 4-1, 4-2, 4-3, 4-4, and 4-5). These cables must be handled with extreme care to avoid damage.

Apply only the tension required to seat or unseat the cables during insertion or removal from the connector. Handle cables by the connector whenever possible. In all cases, avoid bending, twisting, or tearing the cables, and ensure that cables are placed in such a way that they cannot be caught or snagged by parts being removed or replaced.

The numbered cables show the recommended configuration for the ribbon cables. The shaded lines indicate alternative configurations for additional optional hard drives, tape drives, and diskette drives.

Image5.gif (7488 bytes)

CAUTION:  When servicing these computers, ensure that cables are placed in their proper location during the reassembly process. Improper cable placement can cause severe damage to the unit.

Top 

 

 
1.800.AT.COMPAQ
 
privacy and legal statement