![background image](http://html1.mh-extra.com/html/ibm/thinkpad-t21/thinkpad-t21_hardware-maintenance-manual_4135468023.webp)
damage by equalizing the charge so that the machine, the
part, the work mat, and the person handling the part are all
at the same charge.
Notes
1. Use product-specific ESD procedures when they
exceed the requirements noted here.
2. Make sure that the ESD protective devices you
use have been certified (ISO 9000) as fully
effective.
When handling ESD-sensitive parts:
v
Keep the parts in protective packages until they are
inserted into the product.
v
Avoid contact with other people.
v
Wear a grounded wrist strap against your skin to
eliminate static on your body.
v
Prevent the part from touching your clothing. Most
clothing is insulative and retains a charge even when
you are wearing a wrist strap.
v
Use the black side of a grounded work mat to provide a
static-free work surface. The mat is especially useful
when handling ESD-sensitive devices.
v
Select a grounding system, such as those listed below,
to provide protection that meets the specific service
requirement.
Note
The use of a grounding system is desirable but
not required to protect against ESD damage.
– Attach the ESD ground clip to any frame ground,
ground braid, or green-wire ground.
– Use an ESD common ground or reference point
when working on a double-insulated or
battery-operated system. You can use coax or
connector-outside shells on these systems.
– Use the round ground-prong of the AC plug on
AC-operated computers.
Grounding requirements
Electrical grounding of the computer is required for
operator safety and correct system function. Proper
grounding of the electrical outlet can be verified by a
certified electrician.
Safety information
Introduction
17
Summary of Contents for ThinkPad T21
Page 4: ...iv ThinkPad T20 T21 T22 T23 MT 2647 2648...
Page 44: ...Checkout guide 38 ThinkPad T20 T21 T22 T23 MT 2647 2648...
Page 83: ...9 8 7 7 8 9 10 9 continued Removing and replacing a FRU ThinkPad T20 T21 T22 and T23 series 77...
Page 132: ...6 5 4 7 5 3 continued Removing and replacing a FRU 126 ThinkPad T20 T21 T22 T23 MT 2647 2648...
Page 181: ...Notices ThinkPad T20 T21 T22 and T23 series 175...
Page 182: ...Part Number 62P9631 1P P N 62P9631...