IBM Thinkpad T20 T21 T22 T23 Manual

–When using testers, set the controls correctly and
use the approved probe leads and accessories for
that tester.
–Stand on suitable rubber mats (obtained locally, if
necessary) to insulate you from grounds such as
metal floor strips and machine frames.
Observe the special safety precautions when you work
with very high voltages; these instructions are in the
safety sections of maintenance information. Use
extreme care when measuring high voltages.
vRegularly inspect and maintain your electrical hand...

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:
vElectrical hazards, especially primary power (primary
voltage on the frame can cause serious or fatal
electrical shock)
vExplosive hazards, such as a damaged CRT face or a
bulging capacitor
vMechanical hazards, such as loose or missing hardware
To determine whether there are any...

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.
Notes1. 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:
vKeep the parts in protective packages until they are
inserted into the product.
vAvoid contact with other people.
vWear a grounded wrist...

Laser compliance statement
Some IBM Personal Computer models are equipped from
the factory with an optical storage device such as a
CD-ROM drive or a DVD-ROM drive. They are also sold
separately as options. The drive is certified in the U.S. to
conform to the requirements of the Department of Health
and Human Services 21 Code of Federal Regulations
(DHHS 21 CFR) Subchapter J for Class 1 laser products.
Elsewhere, the drive is certified to conform to the
requirements of the International Electrotechnical...

When a CD-ROM drive, DVD drive or the other laser
product is installed, note the following:
CAUTION:
Opening the CD-ROM drive, DVD-ROM drive or the other
optical storage device could result in exposure to
hazardous laser radiation. There are no serviceable parts
inside those drives.Do not open. Use of controls or adjustments or performance of
procedures other than those specified herein might
result in hazardous radiation exposure.
O uso de controles, ajustes ou desempenho de
procedimentos diferentes...

Some CD-ROM drives, DVD-ROM drives, or other optical
storage devices contain an embedded Class 3A or Class
3B laser diode. Note the following:
DANGER
Emits visible and invisible laser radiation when
open. Do not stare into the beam, do not view
directly with optical instruments, and avoid direct
exposure to the beam.
Radiação por raio laser ao abrir. Não olhe fixo no
feixe de luz, não olhe diretamente por meio de
instrumentosóticos e evite exposição direta com o
feixe de luz.
Rayonnement laser si carter...

General descriptions
This chapter includes descriptions for any ThinkPad model
that has the PC-Doctor DOS diagnostics program. Some
descriptions might not apply to your particular computer.
Read this first
Before you go to the checkout guide, be sure to read this
section.
Important notes
vOnly certified trained personnel should
service the computer.
vRead the entire FRU removal and replacement
page before replacing any FRU.
vUse new nylon-coated screws when you
replace FRUs.
vBe extremely careful during...

__ 4. Date of purchase
__ 5. Failure symptoms, error codes appearing on the
display, and beep symptoms
__ 6. Procedure index and page number in which the
failing FRU was detected
__ 7. Failing FRU name and part number
__ 8. Machine type, model number, and serial number
__ 9. Customer’s name and address
Note for warranty:
During the warranty period, the customer may be
responsible for repair costs if the computer damage was
caused by misuse, accident, modification, unsuitable
physical or operating...

Related service information
This section provides information about the following:
v“Service web site”
v“Restoring the preloaded system”
v“Passwords”on page 26
v“Power management”on page 28
Service web site
When the latest maintenance diskette and the system
program service diskette become available, a notice will be
posted onhttp://www.ibm.com/pc/partner/infotips
Restoring the preloaded system
If the data on a hard-disk drive is damaged or accidentally
erased, you can restore the software that was...

2. At the prompt, press F11. (The option to press F11
appears for only a few seconds. You must press F11
quickly.) The Product Recovery program main menu
opens.
Note:If you are prompted to select the operating
system, select one you want to recover. Then
the Product Recovery program main menu
opens.
3. SelectSystem Utilitiesfrom the main menu. Press
Enter.
4. SelectCreate a Recovery Repair diskette. Press
Enter.
5. Follow the on-screen instructions.
6. When the process is completed, label the diskette...