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4.1 Overview 4 Replacement Procedures
Screw Tightening Torque
Use the following torque when tightening screws.
Caution: Overtightening may damage screws or parts. Undertightening may allow screws
to loosen (and possibly fall out) causing a short circuit or other damage.
Note: To tighten screws quickly and accurately, an electric screwdriver is recommended.
M2 (2mm) 0.167 N•m (1.7 kgf •cm)
M2.5 (2.5mm) 0.294 N•m(3.0 kgf•cm)
M3 (3mm) 0.549 N•m(5.6 kgf•cm)
Note: To prevent damage to THIN HEAD screws, use type 0 pit philips screwdriver. Use,
however, the PH point size “1” screwdriver for screws fixing the expansion memory
slot cover and the keyboard. Press along the axis of the screwdriver while turning
the screw. This is because the contact area between the screw and driver is less than
for a pan head screw (standard pan-shaped screw head).
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
TECRA M4 Maintenance Manual (960-521) [CONFIDENTIAL] 4-7