BDP-S495 - Sony DVD Service Manual (repair manual). Page 26

1-5-1. Whenever you need to diassemble or assemble the PS Insulator please handle it with care,
 

since it might be broken.

1-5-2. Whenever you need to diassemble or assemble MB-144 board, please make sure the  
            radiation sheet is at the right place, since it might be ripped. Please refer Fig 1 and Fig 2.

1-5-3. Whenever you need to diassemble or assemble OP-020 Board, please make sure the  
            harness dressing is at the right place

Fig 1 : Top side

Fig 2 : Bottom side

At the bottom

Slit