IBM THINKPAD A20M Instrukcja Użytkownika Pobierz pdf (Strona 62)

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. In IBM

ThinkPad computer, this problem is addressed with special

nylon-coated screws that have the following characteristics:

v They maintain tight connections.

v They do not easily come loose, even with shock or

vibration.

v They are harder to tighten.

v They should be used only once.

Do the following when you service this machine:

v Keep the screw kit (for the P/N, see “Miscellaneous

parts” on page 145) in your tool bag.

v Always use new screws.

v Use a torque screwdriver if you have one.

Tighten screws as follows:

v Plastic to plastic

Turn an additional 90 degrees after the screw head

touches the surface of the plastic part:

90 degrees more

(Cross-section)

v Logic card to plastic

Turn an additional 180 degrees after the screw head

touches the surface of the logic card:

180 degrees more

(Cross-section)

v Torque driver

If you have a torque driver, refer to the “Torque” column

for each step.

FRU replacement notices

56 ThinkPad A20m/p, A21m/p, A22m/p

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 157 158

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IBM THINKPAD A20M Instrukcja Użytkownika Strona 62