IBM Thinkpad A21e 2000 Manual

							3. If any error is detected, replace the FRU shown by the
FRU code. Rerun the test to verify that no more errors
exist.
Undetermined problems
You are here because the diagnostic tests did not identify
which adapter or device failed, wrong devices are installed,
a short circuit is suspected, or the system is inoperative.
Follow these procedures to isolate the failing FRU (do not
isolate FRUs that have no defects).
Verify that all attached devices are supported by the
computer.
Verify that the power supply being used at the time of the
failure is operating correctly. (See“Power system
checkout”on page 29.)
1. Power off the computer.
2. Visually check each FRU for damage. Replace any
damaged FRU.
3. Remove or disconnect all of the following devices:
a. Non-IBM devices
b. Devices attached to the port replicator
c. Printer, mouse, and other external devices
d. Battery pack
e. Hard-disk drive
f. External diskette drive
g. DIMM
h. CD-ROM and diskette drive in the UltraslimBay
i. PC Cards
4. Power on the computer.
5. Determine whether the problem has changed.
6. If the problem does not recur, reconnect the removed
devices one at a time until you find the failing FRU.
7. If the problem remains, replace the following FRUs one
at a time (do not replace a nondefective FRU):
a. System board
b. LCD assembly
FRU replacement notices
This section contains notices related to removing and
replacing parts. Read this section carefully before replacing
any FRU.
Screw notices
Loose screws can cause a reliability problem. The an IBM
ThinkPad computer address this problem with special
nylon-coated screws that have the following characteristics:
vThey maintain tight connections.
vThey do not easily come loose, even with shock or
vibration.
Symptom-to-FRU index
ThinkPad A21e47 
						

							vThey are harder to tighten.
vThey should be used only once.
Do the following when you service this machine:
vKeep the screw kit (for reference the P/N, see
“Miscellaneous parts”on page 96) in your tool bag.
vAlways use new screws.
vUse a torque screwdriver if you have one.
Tighten screws as follows:
vPlastic to plastic
Turn an additional90 degreesafter the screw head
touches the surface of the plastic part:
vLogic card to plastic
Turn an additional180 degreesafter the screw head
touches the surface of the logic card:
vTorque driver
If you have a torque driver, refer to the“Torque”column
for each step.
vMake sure you use the correct screw. If you have a
torque screwdriver, tighten all screws firmly to the torque
shown in the table.Never use a screw that you
removed. Use a new one. Make sure the screws are
tightened firmly.
Retaining serial numbers
This section includes the following descriptions:
v“Restoring the serial number of the system unit”on
page 49
v“Retaining the UUID”on page 49
FRU replacement notices
48ThinkPad A21e 
						

							Restoring the serial number of the system
unit
When the computer was manufactured, the EEPROM on
the system board was loaded with the serial numbers of
the system and all major components. These numbers
need to remain the same throughout the life of the
computer.
If you replace the system board, you must restore the
serial number of the system unit to its original value.
Before replacing the system board, save the original serial
number by doing the following:
1. Install the ThinkPad hardware maintenance diskette
version 1.61, and restart the computer.
2. From the main menu, select1. Set System
Identification.
3. Select2. Read S/N data from EEPROM.
The serial number for each device is displayed. Write
down the serial number of the system unit, designated as
follows:
20: System unit serial number
After you have replaced the system board, restore the
serial number by doing the following:
1. Install the ThinkPad hardware maintenance diskette
version 1.61 and restart the computer.
2. From the main menu, select1. Set System
Identification.
3. Select1. Add S/N data from EEPROM.
Follow the instructions on the screen.
Note:The serial number of the system unit is written on
the label attached on the bottom of the computer.
Retaining the UUIDThe Universally Unique Identifier (UUID) is a 128-bit
number uniquely assigned to your computer at production
and stored in the EEPROM of your system board. The
algorithm that generates the number is designed to provide
unique IDs until the year A.D. 3400. No two computers in
the world have the same number.
When you replace the system board, you must set the
UUID on the new system board as follows:
1. Install the ThinkPad hardware maintenance diskette
version 1.61, and restart the computer.
2. From the main menu, select4. Assign UUID.
A new UUID is created and written. If a valid UUID
already exists, it is not overwritten.
FRU replacement notices
ThinkPad A21e49 
						

							Removing and replacing a FRU
This section presents information and drawings for use in
removing and replacing a FRU. Be sure to observe the
following general rules:
1. Do not try to service the computer unless you have
been trained and certified. An untrained person runs
the risk of damaging parts.
2. Before replacing any FRU, review“FRU replacement
notices”on page 47.
3. Begin by removing any FRUs that have to be removed
before the failing FRU. Any such FRUs are listed at the
top of the page. Remove them in the order in which
they are listed.
4. Follow the correct sequence in the steps for removing
the FRU, as indicated in the drawings by the numbers
in square callouts.
5. When turning a screw to replace a FRU, turn it in the
direction indicated by the arrow in the drawing.
6. When removing the FRU, move it in the direction
indicated by the arrow in the drawing.
7. To put the new FRU in place, reverse the removal
procedure and follow any notes that pertain to
replacement. For information about connecting and
arranging internal cables, see“Locations”on page 87.
8. When replacing a FRU, use the correct screw as
shown in the procedures.
CAUTION:
Before removing any FRU, power off the computer,
unplug all power cords from electrical outlets, remove
the battery pack, and then disconnect any
interconnecting cables.
CAUTION:
Do not disassemble the battery pack, throw it into fire
or water, or short-circuit it. Dispose of the battery pack
as required by local ordinances or regulations.
Attention:Before the computer is powered on after FRU
replacement, make sure all screws, springs, and other
small parts are in place and are not loose inside the
computer. Verify this by shaking the computer gently and
listening for rattling sounds. Metallic parts or metal flakes
can cause electrical short circuits.
Attention:The system board is sensitive to, and can be
damaged by, electrostatic discharge. Establish personal
grounding by touching a ground point with one hand before
touching these units.
You must use an electrostatic discharge (ESD) strap (P/N
6405959) to establish personal grounding.
Removing and replacing a FRU
50ThinkPad A21e 
						

							1010 Battery pack
CAUTION:
If the rechargeable battery pack is incorrectly replaced,
there is danger of an explosion. The battery pack
contains a small amount of harmful substances. To
avoid possible injury: (1) replace only with a battery of
the type recommended by IBM, or an equivalent, (2)
keep the battery pack away from fire, (3) do not
expose it to water or rain, (4) do not attempt to
disassemble it, (5) do not short-circuit it. Do not put
the battery pack in trash that is disposed of in
landfills. When disposing of the battery, comply with
local ordinances or regulations.
Removing and replacing a FRU
ThinkPad A21e51 
						

							1020 DIMM
Note:Loosen the screw
1, but do not remove it.
When installing:With the notched end of the DIMM
toward the socket, insert the DIMM into
the socket, then press it firmly. Pivot the
DIMM until it snaps into place. Make
sure that the card is firmly fixed in the
slot and does not move easily. vBattery pack(1010)
Removing and replacing a FRU
52ThinkPad A21e 
						

							1030 Mini PCI adapter
Note:Loosen the screw
1, but do not remove it.
21
(continued) vBattery pack(1010)
Removing and replacing a FRU
ThinkPad A21e53 
						

							Note:The illustration shows the combo card. Connector
(A)is for the LAN feature and(B)is for the modem
feature. This slot also supports a Mini PCI modem
card or Mini PCI network card. Step
5depends
on the card type. Disconnect either(A),(B)or both.
When installing the card, do the following:
vWith the notched end of the card toward the socket,
insert the card into the socket, then press it firmly. Pivot
the card until it snaps into place. Make sure that the
card is firmly fixed in the slot and does not move easily.
vMake sure that the connector(A)is placed under the
card when reinstalling the Mini PCI adapter.
Removing and replacing a FRU
54ThinkPad A21e 
						

							1040 Backup battery
CAUTION:
There is a danger of an explosion if the backup battery
is incorrectly replaced. The lithium battery (IBM P/N
02K6572 UL-recognized component [file no. MH12210])
contains lithium and can explode if it is not properly
handled or disposed of. Replace only with a battery of
the same type. To avoid possible injury or death, do
not: (1) throw or immerse the battery into water, (2)
allow it to heat to more than 100°C (212°F), or (3)
attempt to repair or disassemble it. Dispose of it as
required by local ordinances or regulations.
vBattery pack(1010)
vDIMM(1020)
vMini PCI adapter(1030)
Removing and replacing a FRU
ThinkPad A21e55 
						

							1050 Hard-disk drive
AttentionDo not drop or apply any shock to the hard-disk
drive.The hard-disk drive is sensitive to physical
shock. Incorrect handling can cause damage and
permanent loss of data.
Before removing the drive, have the user make a
backup copy of all the information on the drive if
possible.
Never remove the drive while the system is
operating or is in suspend mode.
Note:The hard disk is attached to the cover.
Step Screw (quantity)

1Coin screw (1) or security screw (1)
Note:Use a 2.5-mm Allen wrench to remove the security screw.
vBattery pack(1010)
Removing and replacing a FRU
56ThinkPad A21e