Sony Ericsson Xperia Mini Pro Working Instructions page 59

Replacement: Main Keypad
Insert the Main Keypad under the upper module until it
makes contact with the stoppers.
Press on all sides of the Main Keypad back and forth as
shown to secure its solid attachment.
1251-8382 Rev 2
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Sony Ericsson Mobile Communications AB – Company Internal
Working Instructions (mech)
59(85)