Reinstall all covers correctly before returning the
machine to the customer.
Electrical safety
Observe the following rules when working on electrical
equipment.
Important
Use only approved tools and test equipment. Some
hand tools have handles covered with a soft material
that does not insulate you when working with live elec-
trical currents.
Many customers have, near their equipment, rubber
floor mats that contain small conductive fibers to
decrease electrostatic discharges. Do not use this type
of mat to protect yourself from electrical shock.
Find the room emergency power-off (EPO) switch,
disconnecting switch, or electrical outlet. If an elec-
trical accident occurs, you can then operate the
switch or unplug the power cord quickly.
Do not work alone under hazardous conditions or
near equipment that has hazardous voltages.
Disconnect all power before:
–
Performing a mechanical inspection
–
Working near power supplies
–
Removing or installing main units
Before you start to work on the machine, unplug the
power cord. If you cannot unplug it, ask the customer
to power-off the wall box that supplies power to the
machine and to lock the wall box in the off position.
If you need to work on a machine that has
exposed
electrical circuits, observe the following precautions:
–
Ensure that another person, familiar with the
power-off controls, is near you.
Attention:
Another person must be there to
switch off the power, if necessary.
–
Use only one hand when working with
powered-on electrical equipment; keep the other
hand in your pocket or behind your back.
Attention:
An electrical shock can occur only
when there is a complete circuit. By observing
the above rule, you may prevent a current from
passing through your body.
–
When using testers, set the controls correctly
and use the approved probe leads and accesso-
ries for that tester.
Introduction
11
Summary of Contents for ThinkPad X21 2660
Page 1: ...IBM Mobile Systems ThinkPad X21 2660 2661 2662 Hardware Maintenance Manual February 2001 ...
Page 2: ...i ...
Page 23: ...18 ThinkPad X21 ...
Page 60: ...1070 Mini PCI adapter Battery pack 1010 Keyboard assembly 1050 6 ThinkPad X21 55 ...
Page 62: ...1090 LCD assembly Battery pack 1010 Keyboard assembly 1050 1 ThinkP ad 2 ThinkPad X21 57 ...
Page 71: ...Step Screw quantity Torque 1 M2 3 5mm 2 BK 19 6 Ncm 2 kgfcm 66 ThinkPad X21 ...
Page 73: ...1 Step Screw quantity Torque 1 M2 3 5mm 2 BK 19 6 Ncm 2 kgfcm 68 ThinkPad X21 ...
Page 85: ...80 ThinkPad X21 ...
Page 87: ...IBM Part Number 19K6850 Printed in U S A S1ðL 9626 ðð ...