DSC-W90 (serv.man2) - Sony Digital Camera Service Manual (repair manual). Page 13

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2-6
DSC-W90_L2
2-3. EXCHANGE  METHOD  OF  BARRIER  BLOCK
4
Ornamental ring (A)
2-3-1.
HOW  TO  REMOVE  THE  ORNAMENTAL  RING  (A)
1
Turn on the power switch.
 
2
With the ornamental ring (A) extended, remove the battery forcibly.
3
Apply a solvent to the tweezers or a needle, and dissolve the adhesive on 
the barrier tapes that secure the ornamental ring (A) to the barrier block.
4
Rotate the ornamental ring (A) clockwise to remove.
2-3-2.
HOW  TO  REMOVE  THE  BARRIER  BLOCK
1
Remove two screws.
2
Remove the barrier block and the inner ring.
Barrier block
Barrier tape
3
Solvent
2
Barrier block
2
Inner ring
1
Two screws
Tweezers
Note: 
Do not hold the part of spring.
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