IBM 600X (MT 2646) User Manual
FRU replacement notices
FRU replacement notices
This section contains notices for removal and replacement.
Read this section carefully before replacing any FRU.
Read this section carefully before replacing any FRU.
Screw notices
Loose screws can cause a reliability problem. The IBM
ThinkPad computer address this problem with special
nylon-coated screws that have the following characteristics:
ThinkPad computer address this problem with special
nylon-coated screws that have the following characteristics:
They maintain tight connections.
They do not easily come loose, even with shock or
vibration.
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.
Tighten screws as follows:
Plastic to plastic
Turn an additional 90 degrees after the screw head
touches the surface of the plastic part:
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:
touches the surface of the logic card:
Torque driver
If you have a torque driver, refer to the “Torque”
column with each step.
If you have a torque driver, refer to the “Torque”
column with each step.
Make sure you use the correct screw, and tighten all
screws firmly to the torque shown in the table if you
screws firmly to the torque shown in the table if you
33