Safety Inspection Guide - Lenovo ThinkPad R61 7735 Hardware Maintenance Manual

v Always look carefully for possible hazards in your work area. Examples of these
v Do not touch live electrical circuits with the reflective surface of a plastic dental
v Do not service the following parts with the power on when they are removed
v If an electrical accident occurs:

Safety inspection guide

The purpose of this inspection guide is to assist you in identifying potentially
unsafe conditions. As each machine was designed and built, required safety items
were installed to protect users and service personnel from injury. This guide
addresses only those items. You should use good judgment to identify potential
safety hazards due to attachment of non-ThinkPad features or options not covered
by this inspection guide.
If any unsafe conditions are present, you must determine how serious the apparent
hazard could be and whether you can continue without first correcting the
problem.
Consider these conditions and the safety hazards they present:
v Electrical hazards, especially primary power (primary voltage on the frame can
v Explosive hazards, such as a damaged CRT face or a bulging capacitor
v Mechanical hazards, such as loose or missing hardware
To determine whether there are any potentially unsafe conditions, use the
following checklist at the beginning of every service task. Begin the checks with
the power off, and the power cord disconnected.
Checklist:
1. Check exterior covers for damage (loose, broken, or sharp edges).
2. Power off the computer. Disconnect the power cord.
3. Check the power cord for:
4. Check for cracked or bulging batteries.
5. Remove the cover.
hazards are moist floors, nongrounded power extension cables, power surges,
and missing safety grounds.
mirror. The surface is conductive; such touching can cause personal injury and
machine damage.
from their normal operating places in a machine:
– Power supply units
– Pumps
– Blowers and fans
– Motor generators
and similar units. (This practice ensures correct grounding of the units.)
– Use caution; do not become a victim yourself.
– Switch off power.
– Send another person to get medical aid.
cause serious or fatal electrical shock)
a. A third-wire ground connector in good condition. Use a meter to measure
third-wire ground continuity for 0.1 ohm or less between the external
ground pin and the frame ground.
b. The power cord should be the type specified in the parts list.
c. Insulation must not be frayed or worn.
3
Safety information