Lenovo ThinkPad T420si Hardware Maintenance Manual - Page 91

Removal steps of palm rest or palm rest with fingerprint reader

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Note: In models with the fingerprint reader, the sensor is attached to the palm rest FRU. If the fingerprint reader is defective, you can replace the palm rest by following the procedures in this section. The replacement procedures are the same for a palm rest with or without a fingerprint reader. Removal steps of palm rest or palm rest with fingerprint reader 2 1 1 1 1 1 1 1 1 1 1 1 1 2 1 3 Step 1 2 3 Screw (quantity) M2 × 5 mm, flat-head, nylon-coated (13) M2.5 × 5 mm, flat-head, nylon-coated (2) M2 × 3 mm, flat-head, nylon-coated (1) Color Black Black Silver Torque 0.181 Nm (1.85 kgfcm) 0.181 Nm (1.85 kgfcm) 0.181 Nm (1.85 kgfcm) 4 4 4 Step 4 Screw (quantity) M2 × 5 mm, flat-head, nylon-coated (3) Color Black Torque 0.181 Nm (1.85 kgfcm) Chapter 8. Removing and replacing a FRU 85

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Note:
In models with the fingerprint reader, the sensor is attached to the palm rest FRU. If the fingerprint
reader is defective, you can replace the palm rest by following the procedures in this section. The
replacement procedures are the same for a palm rest with or without a fingerprint reader.
Removal steps of palm rest or palm rest with fingerprint reader
1
3
1
2
2
Step
Screw (quantity)
Color
Torque
1
M2 × 5 mm, flat-head, nylon-coated (13)
Black
0.181 Nm
(1.85 kgfcm)
2
M2.5 × 5 mm, flat-head, nylon-coated (2)
Black
0.181 Nm
(1.85 kgfcm)
3
M2 × 3 mm, flat-head, nylon-coated (1)
Silver
0.181 Nm
(1.85 kgfcm)
4
4
4
Step
Screw (quantity)
Color
Torque
4
M2 × 5 mm, flat-head, nylon-coated (3)
Black
0.181 Nm
(1.85 kgfcm)
Chapter 8
.
Removing and replacing a FRU
85