1100 Palm Rest With Fingerprint Reader, Smart Card Reader, And Speaker - Lenovo ThinkPad T420 4177 Hardware Maintenance Manual

Lenovo thinkpad t420 4177: supplementary guide
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Table 18. Removal steps of backup battery
When installing:
Attach the backup battery
connector is attached firmly.

1100 Palm rest with fingerprint reader, smart card reader, and speaker

For access, remove these FRUs in order:
"1010 Battery pack" on page 66
"1080 Keyboard" on page 78
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.
a
in the insulation sheet as shown in the figure below and make sure that the battery
.
Chapter 8
Removing and replacing a FRU
83

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