Screws; Cables And Connectors; Lithium Coin Cell Battery - HP t820 Maintenance & Service Manual

Diagnostics software
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Tamper-resistant T-15 wrench
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Screws

The screws used in the computer are not interchangeable. They may have standard or metric threads
and may be of different lengths. If an incorrect screw is used during the reassembly process, it can
damage the unit. HP strongly recommends that all screws removed during disassembly be kept with the
part that was removed, then returned to their proper locations.
CAUTION:
drives only.
CAUTION:
work area to prevent damage.

Cables and connectors

Most cables used throughout the unit are flat, flexible cables. These cables must be handled with 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 or twisting the cables, and ensure that the cables are routed in such a way that they cannot be
caught or snagged by parts being removed or replaced.
CAUTION:
during the reassembly process. Improper cable placement can damage the computer.

Lithium coin cell battery

The battery that comes with the computer provides power to the real-time clock and has a minimum
lifetime of about three years.
See the appropriate removal and replacement chapter for the chassis you are working on in this guide
for instructions on the replacement procedures.
WARNING!
battery is handled improperly. Do not disassemble, crush, puncture, short external contacts, dispose in
water or fire, or expose it to temperatures higher than 140ºF (60ºC). Do not attempt to recharge the
battery.
NOTE:
Batteries, battery packs, and accumulators should not be disposed of together with the
general household waste. In order to forward them to recycling or proper disposal, please use the
public collection system or return them to HP, their authorized partners, or their agents.
16 Chapter 3 Routine care and disassembly preparation
Metric screws have a black finish. U.S. screws have a silver finish and are used on hard
As each subassembly is removed from the computer, it should be placed away from the
When servicing this computer, ensure that cables are placed in their proper location
This computer contains a lithium battery. There is a risk of fire and chemical burn if the