Lenovo ThinkPad i Series 172x ThinkPad 390 / i Series 1720 models Hardware Mai - Page 55

FRU Removals and Replacements, Fan Diagnostics, Safety Notice 1

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2. Select Fan Diagnostics from PC DOS 7.0 Startup menu. 3. Follow the instructions on the screen to execute the fan diagnostics. Note: If the test fails, try reseating the Fan ASM connector or replacing the Fan ASM. FRU Removals and Replacements This section contains information about removals and replacements. Do not damage any parts. Only certified and trained personnel should service the computer. The arrows in this section show the direction of movement to remove a FRU, or to turn a screw to release the FRU. The arrows are marked in numeric order, in square callout, to show the correct sequence of removal. When other FRUs must be removed before the failing FRU is removed, they are listed at the top of the page. To replace a FRU, reverse the removal procedure and follow any notes that pertain to replacement. When replacing a FRU, use the correct screw size, as shown in the procedures. Safety Notice 1: Before the computer is powered on after FRU replacement, make sure all screws, springs, or other small parts are in place and are not left loose inside the computer. Verify this by shaking the computer and listening for rattling sounds. Metallic parts or metal flakes can cause electrical short circuit. Safety Notice 4: The lithium battery can cause a fire, explosion, or severe burn. Do not recharge it, remove its polarized connector, disassemble it, heat it above 100°C (212 °F), incinerate it, or expose its cell contents to water. Dispose of the battery as required by local ordinances or regulations. Use only the battery in the appropriate parts listing. Use of an incorrect battery can result in ignition or explosion of the battery. Safety Notice 8: Before removing any FRU, power-off the computer, unplug all power cords from electrical outlets, remove the Battery ASM, and then disconnect any interconnecting cables. An electrostatic discharge (ESD) strap (P/N 6405959) must be used to establish personal grounding. ThinkPad 390/i Series 1700 47

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2.
Select
Fan Diagnostics
from PC DOS 7.0 Startup
menu.
3.
Follow the instructions on the screen to execute the
fan diagnostics.
Note:
If the test fails, try reseating the Fan ASM con-
nector or replacing the Fan ASM.
FRU Removals and Replacements
This section contains information about removals and
replacements.
±
Do not damage any parts. Only certified and trained
personnel should service the computer.
±
The arrows in this section show the direction of move-
ment to remove a FRU, or to turn a screw to release
the FRU. The arrows are marked in numeric order, in
square callout, to show the correct sequence of
removal.
±
When other FRUs must be removed before the failing
FRU is removed, they are listed at the top of the
page.
±
To replace a FRU, reverse the removal procedure
and follow any notes that pertain to replacement.
±
When replacing a FRU, use the correct screw size, as
shown in the procedures.
Safety Notice 1:
Before the computer is powered on after FRU replace-
ment, make sure all screws, springs, or other small parts
are in place and are not left loose inside the computer.
Verify this by shaking the computer and listening for rat-
tling sounds. Metallic parts or metal flakes can cause elec-
trical short circuit.
Safety Notice 4:
The lithium battery can cause a fire, explosion, or severe
burn. Do not recharge it, remove its polarized connector,
disassemble it, heat it above 100°C (212 °F), incinerate it,
or expose its cell contents to water.
Dispose of the battery
as required by local ordinances or regulations. Use only
the battery in the appropriate parts listing. Use of an incor-
rect battery can result in ignition or explosion of the
battery.
Safety Notice 8:
Before removing any FRU, power-off the computer, unplug
all power cords from electrical outlets, remove the Battery
ASM, and then disconnect any interconnecting cables.
An electrostatic discharge (ESD) strap (P/N 6405959) must
be used to establish personal grounding.
ThinkPad 390/i Series 1700
47