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4.1 Overview 4 Replacement Procedures
Grip Color
Some screws have a colored grip area to help you determine the length of the screw.
Even numbered length screws: Brown
Odd numbered length screws: White
Special length screw: Blue
“Special length screw” means screws whose length is indicated in an integral number to the
first decimal places such as 2.5 mm, 2.6 mm and so on.
Grip area
Screw Notation
To make maintenance of the computer easier, markings of the kinds of the screws including
the types and lengths of the screws are indicated on the computer body.
Format:
Screw type + Screw length (mm)
Screw type
B: Bind screw
F: Flat head screw
S: Super thin head screw
T: Tapping screw
U: Other screws (Unique screws: pan head, stud, etc.)
Example:
B6
... 6mm Bind screw
Screw color/material
B: Black/Nickel
C: Silver/Non-Hexavalent Chromate
U: Other screws (Unique screws: such as stud, etc.)
PORTÉGÉ M780 Maintenance Manual (960-809) [CONFIDENTIAL] 4-9