2.11.3 Safety Inspection Guide
The intent of this inspection guide is to assist you in identifying
potentially unsafe conditions on these products. Each machine, as it was
designed and built, had required safety items installed to protect users
and service personnel from injury. This guide addresses only those items.
However, good judgment should be used to identify potential safety hazards
due to attachment of non-IBM 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:
Electrical hazards, especially primary power (primary voltage on the
frame can cause serious or fatal electrical shock).
Explosive hazards, such as a damaged CRT face or bulging capacitor
Mechanical hazards, such as loose or missing hardware
The guide consists of a series of steps presented in a checklist. 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 system. Disconnect the power cord.
3. Check the power cord for:
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 frame ground.
b. The power cord should be the appropriate type as specified in
"Parts" in topic 1.7.
c. Insulation must not be frayed or worn.
4. Remove the cover.
5. Check for any obvious non-IBM alterations. Use good judgment as to
the safety of any non-IBM alterations.
6. Check inside the unit for any obvious unsafe conditions, such as metal
filings, contamination, water or other liquids, or signs of fire or
smoke damage.
7. Check for worn, frayed, or pinched cables.
8. Check that the power-supply cover fasteners (screws or rivets) have
not been removed or tampered with.
IBM ThinkPad 500 HMM
Safety Inspection Guide
¦ Copyright IBM Corp. 1993
2.11.3 - 1
