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Equipment Guidelines; Unknown User Password - HP Pavilion HDX Maintenance And Service Manual

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Avoid contact with pins, leads, or circuitry.
Turn off power and input signals before inserting or removing connectors or test equipment.

Equipment guidelines

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,
use alligator clips to connect a wrist strap.
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 foot straps on both feet with a minimum of one megohm
resistance between the operator and ground. To be effective, the conductive strips must be worn in
contact with the skin.
The following grounding equipment is recommended to prevent electrostatic damage:
Antistatic tape
Antistatic smocks, aprons, and sleeve protectors
Conductive bins and other assembly or soldering aids
Nonconductive foam
Conductive tabletop workstations with ground cords of one megohm resistance
Static-dissipative tables or floor mats with hard ties to the ground
Field service kits
Static awareness labels
Material-handling packages
Nonconductive plastic bags, tubes, or boxes
Metal tote boxes
Electrostatic voltage levels and protective materials
The following table lists the shielding protection provided by antistatic bags and floor mats.
Antistatic plastic
Carbon-loaded plastic
Metallized laminate

Unknown user password

If the computer you are servicing has an unknown user password, follow these steps to clear the password.
These steps also clear CMOS.
Chapter 4 Removal and replacement procedures
Floor mats
Floor mats
Voltage protection level
1,500 V
7,500 V
5,000 V

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