Sony Xpreia acro S Working Instructions page 66

Reassembly
Turn it over.
Press to secure its position.
Use an air gun to clean the Cap Micro USB and its hole!
Do not touch the sealing rubber of the Cap Micro USB!
Make sure that the Cap Micro USB is clean and no dirt,
particles and fiber attached on it! Otherwise replace a
new one.
Gently insert the plug of the Cap Micro USB into the socket
with fingers as shown in picture.
Turn it over.
1267-1071 Rev 2
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Sony Mobile Communications AB – Company Internal
Working Instructions (mech)
66(76)