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...

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...

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...

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...

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....

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...

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...

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...