Lenovo ThinkPad 600E Hardware Maintance Manual - June 1999: ThinkPad 600, 600E - Page 25

FRU Replacement Notices, Screw Notices

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FRU Replacement Notices FRU Replacement Notices This section contains notices for removal and replacement. Read this section carefully before replacing any FRU. LCD Replacement Notice The TFT LCD for the computer contains over 2,359,296 thin-film transistors (TFTs). A small number of missing, discolored, or lighted dots (on all the time) is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns. The LCD should be replaced if the number of missing, discolored, or lighted dots in any background is 5 or more. Screw Notices This computer uses special nylon-coated screws with the following characteristics: They maintain tight connections. They do not easily come loose, even with shock or vibration. They need additional force to tighten. They should be used only once. Do the following when you service this machine: Keep the screw kit (P/N 05K4841) in your tool bag. Always use new screws if you are instructed. Use a torque screwdriver if you have one. Loose screws can cause a reliability problem. The IBM ThinkPad computer addresses this problem with nylon-coated screws. Tighten screws as follows: Plastic to plastic Turn an additional 90 degrees after the screw head touches the surface of the plastic part: Logic card to plastic Turn an additional 180 degrees after the screw head touches the surface of the logic card: General Descriptions 19

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FRU Replacement Notices
FRU Replacement Notices
This section contains notices for removal and replacement.
Read this section carefully before replacing any FRU.
LCD Replacement Notice
The TFT LCD for the computer contains over 2,359,296
thin-film transistors (TFTs).
A small number of missing,
discolored, or lighted dots (on all the time) is characteristic
of TFT LCD technology, but excessive pixel problems can
cause viewing concerns.
The LCD should be replaced if
the number of missing, discolored, or lighted dots in any
background is
5 or more
.
Screw Notices
This computer uses special nylon-coated screws with the
following characteristics:
±
They maintain tight connections.
±
They do not easily come loose, even with shock or
vibration.
±
They need additional force to tighten.
±
They should be used only once.
Do the following when you service this machine:
±
Keep the screw kit (P/N 05K4841) in your tool bag.
±
Always use new screws if you are instructed.
±
Use a torque screwdriver if you have one.
Loose screws can cause a reliability problem.
The IBM
ThinkPad computer addresses this problem with
nylon-coated screws.
Tighten screws as follows:
±
Plastic to plastic
Turn an additional
90 degrees
after the screw head
touches the surface of the plastic part:
±
Logic card to plastic
Turn an additional
180 degrees
after the screw head
touches the surface of the logic card:
General Descriptions
19